WO2023005951A1 - Flywheel energy storage and inertia conduction system - Google Patents

Abstract

The present disclosure provides a flywheel energy storage and inertia conduction system, comprising a motor, a flywheel energy storage unit, an inertia conduction device, and a generator. The flywheel energy storage unit comprises a flywheel rotor, a flywheel controller, and an auxiliary device. The inertia conduction device is used for conducting rotational inertia and transferring flywheel energy, the flywheel rotor is disconnectably and transmissionally connected to the inertia conduction device, the inertia conduction device can accept changing rotational speed inputs, then the rotational speed can maintain a constant output by means of the speed change, the inertia conduction device is disconnectably and transmissionally connected to the generator, and the generator is used for generating and outputting stable electric energy driven by the inertia conduction device. Connecting the flywheel energy storage and inertia conduction system provided in the present disclosure to a power grid can effectively alleviate the risk that low rotational inertia of a high power electronic system caused by a high proportion of new energy in power grids at present and in the future causes the stability and the regulation capability of the power grid to be drastically reduced.

Description

Flywheel energy storage and inertia transmission system

Cross References to Related Applications

This application is based on a Chinese patent application with application number 202110853120.6 and a filing date of July 27, 2021, and claims the priority of this Chinese patent application. The entire content of this Chinese patent application is hereby incorporated by reference.

technical field

The present disclosure relates to the technical field of energy storage, in particular to a flywheel energy storage and inertia transmission system.

Background technique

With the development of a new round of energy transformation dominated by clean energy, the proportion of new energy in my country's power grid will become higher and higher. However, in new energy technologies, power electronic devices are often used to connect to the grid, and power electronic devices do not have a rotating structure similar to a synchronous machine, have no moment of inertia, and cannot actively provide the necessary voltage and frequency support for the grid, nor can they provide the necessary damping effect. Especially with the increasing penetration of distributed energy resources connected to the grid through power electronic devices, the total moment of inertia of the grid continues to decrease, so there is a risk of large frequency deviations in the grid when a major load or power supply mutation occurs Also keep improving. The connection of a high proportion of power electronic devices will cause the power grid to remain at a low inertia level for a long time, increasing the unbalanced power impact of the system, which brings more and more pressure on the safe and stable operation of the power system. In order to improve and ease the pressure of power grid operation and new energy consumption, an energy storage system with a certain ability to support the dynamic adjustment of the power grid is urgently needed to improve the ability of the power grid to efficiently accept new energy.

public content

The present disclosure is made based on the inventors' discovery and recognition of the following facts and problems:

Flywheel energy storage technology is an energy storage technology that stores energy in the form of kinetic energy. The energy storage/release is realized by the motor/generator driving the rotor to accelerate/decelerate. The main advantages of flywheel energy storage are fast climbing ability, high energy conversion efficiency and long service life, etc. It has unique advantages in providing auxiliary services, such as inertia and frequency regulation. Moreover, the flywheel does not have any geographical restrictions, can be easily installed, and has the advantages of being scalable and replicable on a large scale.

The existing flywheel energy storage technologies all use power electronic devices to assist the motor/generator to perform mutual conversion between kinetic energy and electric energy. When the system needs to store electric energy, it will supply the external AC power to the motor through AC/DC, and then drive the flywheel rotor to rotate and store energy; when it needs to discharge, the power electronic device decouples the rotor inertia of the flywheel rotor , Play the role of rectification, frequency modulation and voltage stabilization to meet the power demand of the load. However, power electronic devices do not have moment of inertia, so it is difficult to participate in grid inertia response. Therefore, flywheel energy storage technology cannot solve the problem that the proportion of total moment of inertia in the current grid is constantly decreasing due to the large-scale use of power electronic devices.

The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, the present disclosure proposes a flywheel energy storage and inertia transmission system.

The flywheel energy storage and inertia transmission system according to the present disclosure includes: a flywheel energy storage unit, the flywheel energy storage unit includes a flywheel rotor and a motor; an inertia transmission device, the inertia transmission device is used for conducting moment of inertia and transferring energy, so The flywheel rotor is detachably connected to the inertia transmission device, and the output speed of the inertia transmission device can be kept constant; and the generator, the inertia transmission device is detachably connected to the generator transmission, so The generator is used to be driven by the inertia conduction device to generate and output electric energy with a stable frequency.

The flywheel energy storage and inertia conduction system provided according to the present disclosure has an inertia conduction device for conducting the moment of inertia, and the output speed of the inertia conduction device can be kept constant, and the generator can output electric energy stably. Connecting the flywheel energy storage and inertia conduction system provided by the embodiments of the present disclosure to the power grid does not require the use of power electronic devices for decoupling, rectification, frequency modulation, and voltage stabilization, and solves the overall problem caused by the large-scale use of power electronic devices in the current power grid. The problem that the proportion of the moment of inertia is constantly decreasing can increase the moment of inertia in the power grid, provide the necessary voltage and frequency support for the power grid, reduce the risk of large frequency deviations in the power grid, enable the power system to operate safely and stably, and improve the The ability of the power grid to efficiently accept new energy.

In some embodiments, the flywheel energy storage and inertia transmission system has an energy release state and an energy storage state. In the energy release state, the motor is on standby, and the flywheel rotor is connected to the inertia transmission device for release. Kinetic energy, the inertia transmission device is connected with the generator to drive the generator to generate electricity, the generator can input stable electric energy to the grid, and in the energy storage state, the motor drives the flywheel rotor Rotating to store kinetic energy, the generator can stop feeding power into the grid. In some embodiments, the inertia transfer device includes a moment of inertia input end and an inertia moment output end, the flywheel rotor is detachably connected to the moment of inertia input end, and the moment of inertia output end is detachably connected The rotational speed of the output end of the moment of inertia can be kept constant. In the state of energy release, the flywheel rotor is connected with the input end of the moment of inertia in order to release kinetic energy. The output end of the moment of inertia The terminal is connected with the generator to drive the generator to generate electricity.

In some embodiments, in the energy storage state, the generator is idling, and/or, the transmission connection between the flywheel energy storage unit and the inertia transmission device is disconnected, and/or, the The rotational speed of the output end of the moment of inertia is zero, and/or, the transmission connection between the inertia transmission device and the generator is disconnected.

In some embodiments, the flywheel energy storage and inertia transmission system has a standby state, and in the standby state, the electric motor is on standby and the generator is idling.

In some embodiments, the inertia transfer device is a speed change device with an adjustable speed ratio so as to maintain the rotational speed of the rotational inertia output end.

In some embodiments, the inertia transfer device is a continuously variable transmission device.

In some embodiments, the inertia conduction device is a permanent magnet transmission device, a permanent magnet transmission device, a hydraulic transmission device, a magnetorheological fluid device, a gear transmission device, a magnetic coupling transmission device, a synchronously adjustable speed transmission device or Double-fed asynchronous adjustable speed change device.

In some embodiments, the inertia conduction device is a permanent magnet transmission device, and the permanent magnet transmission device includes: an inner magnetic ring, a magnetic modulation ring and an outer magnetic ring, and the inner magnetic ring, the magnetic modulation ring and the The outer magnetic ring is sequentially fitted from the inside to the outside and spaced from each other to form an air gap, and the outer magnetic ring includes an inner permanent magnet of the outer magnetic ring, an iron core of the outer magnetic ring, and an outer permanent magnet of the outer magnetic ring; the stator, The stator is sleeved on the outer magnetic ring and spaced from the outer magnetic ring to form an air gap, the outer magnetic ring can be driven by the rotating magnetic field generated by the stator and the speed is adjustable; and an input shaft and an output shaft , the inner magnetic ring is drivingly connected to the input shaft, the magnetic adjusting ring is drivingly connected to the output shaft, the flywheel rotor is disconnectably connected to the input shaft, and the output shaft can be disconnected connected to the generator drive.

In some embodiments, the inertia transfer device includes a moment of inertia input end and an inertia moment output end, the flywheel rotor is detachably connected to the moment of inertia input end, and the moment of inertia output end is detachably connected It is in drive connection with the generator, wherein the rotational speed of the output end of the moment of inertia can be kept constant.

In some embodiments, the flywheel energy storage and inertia transmission system includes a first transmission shaft and a second transmission shaft, the first transmission shaft connects the flywheel rotor, the electric motor and the input end of the moment of inertia, and the first transmission shaft Two transmission shafts are connected to the output end of the moment of inertia and the generator.

In some embodiments, the flywheel energy storage and inertia transfer system further includes a flywheel energy storage controller, and the flywheel energy storage controller is used to control the energy input and input power of the flywheel energy storage unit.

In some embodiments, the flywheel energy storage controller includes: a power grid detection module, which is used to detect the current frequency of the power grid; a motor control module, which is used to control the power grid according to the current frequency of the power grid. The opening and closing of the motor and the input power.

In some embodiments, the flywheel energy storage and inertia conduction system further includes an inertia conduction controller, the inertia conduction controller is used to regulate the transmission ratio of the inertia conduction device, which includes: an input rotational speed detection module, the input rotational speed detection module The module is used to detect the input speed of the inertia transmission device; the calculation module is used to calculate the ideal speed ratio of the inertia transmission device according to the preset value of the input speed of the inertia transmission device and the output speed; the speed ratio A control module, the variable speed ratio control module is used for regulating the variable speed ratio of the inertia transmission device according to the ideal variable speed ratio.

In some embodiments, the output rotational speed of the inertia transfer device is constant at 3000 rpm.

In some embodiments, the frequency of the current output by the generator is 50 Hz.

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.

Description of drawings

FIG. 1 is a schematic diagram of a flywheel energy storage and inertia transfer system according to an embodiment of the disclosure.

2 is a schematic diagram of a flywheel energy storage controller according to an embodiment of the disclosure.

FIG. 3 is a schematic diagram of an inertia conduction controller according to an embodiment of the disclosure.

FIG. 4 is a first flow chart of a control method of a flywheel energy storage and inertia transmission system according to an embodiment of the present disclosure.

FIG. 5 is a second flow chart of the control method of the flywheel energy storage and inertia conduction system according to an embodiment of the disclosure.

FIG. 6 is a third flowchart of the control method of the flywheel energy storage and inertia conduction system according to an embodiment of the present disclosure.

Fig. 7 is a schematic diagram of a flywheel energy storage and inertia transmission system according to Embodiment 1 of the present disclosure.

Fig. 8 is a schematic diagram of a flywheel energy storage and inertia transmission system according to Embodiment 2 of the present disclosure.

Fig. 9 is a schematic structural diagram of a flywheel energy storage unit according to an embodiment of the present disclosure.

Fig. 10 is a schematic structural diagram of a permanent magnet transmission according to an embodiment of the present disclosure.

11 is a cross-sectional view of a permanent magnet transmission according to an embodiment of the present disclosure.

Reference signs:

Flywheel energy storage and inertia transmission system 1; flywheel energy storage unit 10; flywheel rotor 111; motor 112; motor stator 1121; motor rotor 1122; inertia transmission device 20; moment of inertia input 211; moment of inertia output 212; Device 210; generator 30; first transmission shaft 41; second transmission shaft 42; vacuum chamber 50; axial bearing 51; radial bearing 52; radiator 60; motor power supply 70; vibration damping device 80; flywheel energy storage control device 101;

Magnetic ring 001; inner magnetic ring 002; inner permanent magnet 0021; inner magnetic ring core 0022; inner magnetic ring cylinder 0023; outer magnetic ring 003; outer magnetic ring inner permanent magnet 0031; outer magnetic ring core 0032 ; Outer permanent magnet of the outer magnetic ring 0033; Magnetic ring support bearing 0041; Inner support bearing 0042; The first outer magnetic ring support bearing 0043; The second outer magnetic ring support bearing 0044; ring flange 0061; second magnetic adjustment ring flange 0062; first outer magnetic ring flange 0063; second outer magnetic ring flange 0064; stator 100; stator core 110; winding 120; shell 130.

Detailed ways

Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present disclosure and should not be construed as limiting the present disclosure.

The following describes the basic structure of the flywheel energy storage and inertia transmission system 1 according to the embodiment of the present disclosure according to FIG. 1 . As shown in FIG. 1 , the flywheel energy storage and inertia transmission system 1 includes a flywheel energy storage unit 10 , an inertia transmission device 20 and a generator 30 .

The flywheel energy storage unit 10 includes a flywheel rotor 111 and a motor 112 . Acceleration of the flywheel rotor 111 can realize energy storage, and deceleration of the flywheel rotor 111 can realize energy release. The flywheel rotor 111 is connected with the motor 112, and the motor 112 is used to drive the flywheel rotor 111 to rotate. The electric motor 112 accelerates the rotation by driving the flywheel rotor 111 , and finally realizes that electric energy is stored in the form of kinetic energy in the flywheel energy storage unit 10 .

The inertia transfer device 20 is used to transfer the moment of inertia generated by the rotation of the flywheel rotor 111 and drive the generator 30 to generate and output electric energy. Wherein, the flywheel rotor 111 is detachably connected to the inertia transmission device 20 , that is to say, the flywheel rotor 111 may be connected to the inertia transmission device 20 or may not be connected to the inertia transmission device 20 . The inertia transmission device 20 can be disconnected from the generator 30, that is to say, the inertia transmission device 20 can be connected to the generator 30 to drive the generator 30 to generate electricity, or it can not be connected to the generator 30. At this time, the inertia The conduction device 20 cannot drive the generator 30 to generate electric energy. Optionally, the generator 30 can input the generated electric energy into the grid.

The output rotational speed of the inertia conduction device 20 is kept constant, so that the inertia conduction device 20 can drive the generator 30 to generate and output a stable current. That is to say, by keeping the output speed of the inertia transmission device 20 constant, kinetic energy can be stably input to the generator 30 , and the generator 30 can stably generate electricity under stable driving, and generate and output stable current.

Optionally, the flywheel energy storage and inertia conduction system 1 can be connected to the grid so as to participate in the grid inertia response, store the overflow energy in the flywheel rotor 111 according to the overflow ratio, or draw energy from the flywheel rotor 111 according to the missing ratio to supplement the grid, and reduce the grid frequency fluctuation.

The flywheel energy storage and inertia conduction system provided according to the embodiments of the present disclosure has an inertia conduction device for conducting the moment of inertia, and the output speed of the inertia conduction device can be kept constant, and the generator can stabilize the output current. Connecting the flywheel energy storage and inertia conduction system provided by the embodiments of the present disclosure to the power grid does not need to use power electronic devices for decoupling, rectification, frequency modulation, and voltage stabilization, and solves the total moment of inertia caused by the use of power electronic devices in the current power grid The problem of continuous reduction can improve the moment of inertia in the grid, provide the necessary voltage and frequency support for the grid, reduce the risk of large frequency deviations in the grid, enable the safe and stable operation of the power system, and improve the efficient reception of the grid new energy capabilities.

The following describes the composition, connection relationship and operation process of the flywheel energy storage and inertia transmission system 1 provided by the present disclosure by taking the schematic diagram of the flywheel energy storage and inertia transmission system 1 shown in FIG. 1 as an example.

In the embodiment shown in FIG. 1 , the flywheel energy storage and inertia transmission system 1 includes a flywheel energy storage unit 10 , an inertia transmission device 20 and a generator 30 .

The inertia transmission device 20 is used to transmit the moment of inertia generated by the rotation of the flywheel rotor 111 . The inertia transfer device 20 includes a moment of inertia input terminal 211 and a moment of inertia output terminal 212 . Wherein, the flywheel rotor 111 can be connected to the input terminal 211 of the moment of inertia in transmission, and the output terminal 212 of the moment of inertia can be connected to the generator 30 in transmission. In this embodiment, the transmission direction of the moment of inertia of the inertia transmission device 20 is fixed, that is, it is transmitted from the flywheel rotor 111 to the direction of the generator 30 . The rotational speed of the moment of inertia output end 212 can be kept constant. It should be noted that, in other embodiments, the generator 30 may also be used to convert electrical energy in the grid into kinetic energy and transmit it to the flywheel rotor 111 in the form of inertia response. At this moment, the moment of inertia output terminal 212 is used as the power input terminal, and the moment of inertia input terminal 211 is used as the moment of inertia output terminal, and the electric energy of the grid is transmitted from the generator 30 to the flywheel rotor 111 .

Further, the inertia transfer device 20 is a speed change device with an adjustable speed ratio so as to keep the rotational speed of the moment of inertia output end 212 constant. The gear ratio of the inertia transmission device 20 is the ratio of the input rotation speed to the output rotation speed of the inertia transmission device 20 . The input rotational speed of the inertia transmission device 20 is the rotational speed of the inertia input end 211 , and the output rotational speed of the inertia transmission device 20 is the rotational speed of the rotational inertia output end 212 . The output speed of the inertia transmission device 20 is determined by the gear ratio of the inertia transmission device 20 , which can also be said that the gear ratio of the inertia transmission device 20 is determined by the output speed and input speed of the inertia transmission device 20 .

It should be noted that, in this embodiment, the input speed of the inertia transmission device 20 is equal to the output speed of the flywheel rotor 111 , and the speed of the generator 30 is equal to the output speed of the inertia transmission device 20 .

Those skilled in the art can understand that the rotational speed of the flywheel rotor 111 is usually constantly changing. By adjusting the gear ratio of the inertia transmission device 20, the rotational speed of the moment of inertia output end 212 can be controlled by the flywheel rotor 111. The effect of the change of the rotational speed is always kept constant. That is to say, in order to keep the rotational speed of the moment of inertia output end 212 constant, a preset value is set for the rotational speed of the moment of inertia output end 212, and the ideal gear ratio of the inertia transmission device 20 can be calculated according to the current rotational speed of the flywheel rotor 111 , and constantly adjust the gear ratio of the inertia transmission device 20 according to the ideal gear ratio, so as to realize that the rotational speed of the moment of inertia output end 212 can be kept constant, and the generator 30 can generate electricity stably.

Further, the flywheel energy storage and inertia conduction system 1 provided in the embodiment of the present application has an energy storage state and an energy release state, and can be switched between the energy storage state and the energy release state. It can also be said that the flywheel energy storage and inertia conduction system 1 includes an energy storage stage and an energy release stage during operation, the energy storage stage corresponds to the above energy storage state, and the energy release stage corresponds to the above energy release state. When the flywheel energy storage and inertia conduction system 1 is in the energy storage state, it converts electrical energy into kinetic energy storage; when the flywheel energy storage and inertia conduction system 1 is in the energy release state, it releases the stored kinetic energy and converts the kinetic energy into power output.

The following describes the technical solution of the present application by taking the generator 30 that can be electrically connected to the grid and inputting electric energy into the grid as an example, as follows:

In the state of energy storage, the motor 112 operates and drives the flywheel rotor 111 to rotate, and the speed of the flywheel rotor 111 rises to realize energy storage, and in this state the generator 30 stops inputting electric energy to the grid.

Optionally, the flywheel rotor 111 is driven by the motor 112 to increase its speed to a rated maximum speed. When the rated maximum speed is reached, the flywheel rotor 111 completes energy storage, and then the motor 112 stops driving the flywheel rotor 111 . Optionally, the rated maximum rotational speed is 100rpm-1000000rpm.

In some embodiments, in the energy storage state, the flywheel rotor 111 , the inertia transfer device 20 and the generator 30 maintain a transmission connection, and the generator 30 idles so as to stop inputting electric energy to the grid. That is to say, in the energy storage stage, no power transmission is performed between the generator 30 and the grid, and the generator 30 does not generate electricity.

It should be noted that, in other embodiments, there may be other ways to stop the generator 30 from inputting electric energy to the grid:

For example, in some optional embodiments, in the energy storage state, the transmission connection between the flywheel energy storage unit 10 and the inertia transmission device 20 is disconnected, that is, the connection between the flywheel rotor 111 and the moment of inertia input terminal 211 is disconnected. open, the moment of inertia of the flywheel rotor 111 can no longer be transmitted to the inertia conduction device 20, so the inertia conduction device 20 cannot drive the generator 30 to operate, that is, the generator 30 does not generate electricity, so that the generator 30 stops inputting electric energy to the grid . And/or, in the energy storage state, the rotation speed of the inertia output end 212 of the inertia transmission device 20 is zero, that is, the output rotation speed of the inertia transmission device 20 is zero. It can also be considered that the gear ratio of the inertia transmission device 20 is zero. Therefore, the inertia conduction device 20 cannot drive the generator 30 to operate, and the generator 30 stops inputting electric energy to the grid. And/or, in the energy storage state, the transmission connection between the inertia transfer device 20 and the generator 30 is disconnected, that is, the connection between the moment of inertia output terminal 212 and the generator 30 is disconnected, and the generator 30 cannot be transmitted by the inertia The device 20 is driven and, therefore, the generator 30 stops feeding power into the grid.

Preferably, the generator 30 is idling in the energy storage state to realize the technical solution of stopping the input of electric energy to the grid.

In the state of energy release, the motor 112 is on standby, the flywheel rotor 111 is connected to the input end 211 of the moment of inertia, and the output end 212 of the moment of inertia is connected to the generator 30, the speed of the flywheel rotor 111 releases kinetic energy and the speed drops, and the inertia transmission device 20 drives the generator. 30 generates electricity, and the generator 30 inputs the generated electric energy into the grid.

Wherein the standby state of the motor 112 in the energy-discharging state means that the motor 112 is not operating, and it does not drive the flywheel rotor 111 to accelerate. That is to say, when the flywheel energy storage and inertia conduction system 1 is in the energy release state, the flywheel energy storage and inertia conduction system 1 only has energy output and no energy input. When the flywheel energy storage and inertia transmission system 1 is in the above energy storage state, the flywheel energy storage and inertia transmission system 1 only has energy input and no energy output.

It should be noted that, in the energy-discharging state, the moment of inertia output 212 keeps rotating at a preset speed so that the generator 30 can generate a stable current. That is to say, in the state of energy release, the output rotational speed of the inertia transfer device 20 remains constant, and the generator 30 can input a stable current to the grid at a constant rotational speed.

Optionally, the output rotational speed of the inertia transmission device 20 is constant at 3000 rpm, that is, the generator 30 can operate at a constant rotational speed of 3000 rpm to generate electric energy with a stable frequency.

Further optionally, the frequency of the current output by the generator 30 is 50 Hz, and the generator 30 can directly transmit power to the grid.

It should be noted that the domestic power grid frequency reference line is 50 Hz, and the output speed of the inertia transmission device 20 can be kept constant at 3000 rpm. The foreign power grid frequency reference line is 60Hz, and the output speed of the inertia transmission device 20 can be kept constant at 3600rpm, that is, the output speed of the inertia transmission device 20 can be adjusted according to the frequency reference of the power grid.

In some embodiments, the flywheel energy storage and inertia transmission system 1 also has a standby state. It can also be said that the flywheel energy storage and inertia transmission system 1 also includes a standby stage during operation. When the flywheel energy storage and inertia conduction system 1 is in the standby state, the flywheel energy storage and inertia conduction system 1 is in the energy maintenance stage, that is, there is no energy input or energy output, and the flywheel energy storage and inertia conduction system 1 uses the minimum Loss runs. In the standby state, the motor 112 is on standby, the generator 30 is idling, and the flywheel rotor 111 releases a small amount of kinetic energy to keep the input shaft of the generator 30 rotating at a preset speed.

For example, when the frequency in the grid is equal to a preset value (for example, the grid frequency is equal to 50 Hz), the flywheel energy storage and inertia conduction system 1 enters a standby state, and the flywheel rotor 111 loses a small amount of kinetic energy to maintain the input shaft of the generator 30 at a preset The rotating speed (for example, 3000rpm) is in standby to ensure that the flywheel energy storage and inertia transmission system 1 can cope with the next power grid frequency fluctuation in an optimal state.

In some embodiments, as shown in FIG. 2 , the flywheel energy storage and inertia conduction system 1 further includes a flywheel energy storage controller. The flywheel energy storage controller is used to control the energy input and input power of the flywheel energy storage unit 10, that is, the flywheel energy storage controller is used to control whether to input electric energy to the flywheel energy storage unit 10, and is also used to control the input power to the flywheel energy storage unit 10. power of electrical energy. Optionally, the flywheel energy storage controller is powered by an independent power source to ensure that it will not be affected by fluctuations in the external power grid.

The flywheel energy storage controller includes a grid detection module and a motor control module. The power grid detection module is used to detect the current frequency of the power grid. Optionally, the power grid detection module can monitor the frequency of the power grid in real time, so as to better respond to and regulate the frequency of the power grid.

The communication connection between the motor control module and the grid detection module, the grid detection module transmits the detected grid frequency to the motor control module, the motor control module receives the frequency signal, and controls the opening and closing of the motor 112 according to the frequency signal, and the motor 112 input power.

That is to say, when the motor control module receives the current frequency signal of the power grid and judges that it is necessary to start the motor 112 to store energy in the flywheel energy storage unit 10, the motor control module sends a start signal to the motor 112 to start the motor 112, and from absorb electricity from the grid.

When the motor control module judges according to the current frequency of the power grid that there is no need to store energy in the flywheel energy storage unit 10 , it sends a shutdown signal to the motor 112 to shut down the motor 112 .

Moreover, the motor control module can also determine the magnitude of the input power of the motor 112 according to the current frequency of the grid, and control the power input to the motor 112 .

For example, when the current frequency of the power grid rises above a preset value, the motor control module determines to increase the input power of the motor 112 to regulate the frequency of the power grid to suppress further increase of the power grid frequency. By increasing the input power of the motor 112, the flywheel energy storage unit 10 can absorb more electric energy, and the rotation speed of the flywheel rotor 111 increases. And the greater the frequency deviation of the grid, the greater the moment of the flywheel rotor 111 , that is, the greater the input power of the motor 112 . It can be understood that the input power of the motor 112 will not exceed the maximum power it can withstand.

Therefore, the flywheel energy storage and inertia conduction system 1 provided in the embodiment of the present application can realize auxiliary services such as power grid disturbance power distribution, inertia response, and primary frequency regulation, and improve the primary frequency regulation and inertia support capabilities of the power system. Compared with traditional mechanical inertia, the flywheel energy storage and inertia conduction system 1 provided by the embodiment of the present application can provide faster and more stable frequency control.

In some embodiments, as shown in FIG. 3 , the flywheel energy storage and inertia conduction system 1 also includes an inertia conduction controller, the inertia conduction controller is used to regulate the speed ratio of the inertia conduction device, and the inertia conduction controller includes an input speed detection module, Operation module and variable speed ratio control module.

Wherein, the input rotational speed detection module is used to detect the input rotational speed of the inertia transmission device 20 . The calculation module is used to calculate the ideal gear ratio of the inertia transmission device according to the preset values of the input rotation speed and the output rotation speed of the inertia transmission device. The gear ratio control module is used for adjusting the gear ratio of the inertia transmission device 20 according to the ideal gear ratio.

It can be understood that, in some embodiments, the input rotational speed of the inertia transmission device 20 is equal to the rotational speed of the flywheel rotor 111 , and the input rotational speed detection module can obtain the input rotational speed of the inertia transmission device 20 by detecting the rotational speed of the flywheel rotor 111 .

The preset value of the output speed can be input into the calculation module in advance. For example, the preset value of the output speed is 3000rpm. The calculation module is connected to the input speed detection module by communication. The calculation module can receive the speed signal sent by the input speed detection module, and calculate the ideal speed ratio of the inertia transmission device according to the speed signal and the preset value of the output speed. And transmit the calculated ideal gear ratio to the gear ratio control module. The speed ratio control module is connected with the inertia transmission device 20 so as to adjust the speed ratio of the inertia transmission device 20 to an ideal speed ratio, so that the output speed of the inertia transmission device 20 is constant at the above preset value.

In some embodiments, in order to enable the flywheel energy storage and inertia conduction system 1 to better keep the output rotational speed of the inertia conduction device 20 constant so that the generator 30 can output a stable current, in some embodiments, the inertia conduction device 20 is a continuously variable speed change device, that is, the inertia conduction device 20 can continuously obtain any speed change ratio within the allowable speed change range. The inertia conduction device 20 has a stepless speed change function, the speed ratio of the inertia conduction device 20 can be adjusted more flexibly, the stability of the output speed of the inertia conduction device 20 can be improved, and the generator 30 can continuously and stably output current to the grid .

Further optionally, the inertia conduction device 20 is a permanent magnet transmission device with a continuously variable transmission function, a hydraulic transmission device or a gear transmission device, a transmission device with asynchronously adjustable speed, or a double-feed asynchronously adjustable transmission device.

In some embodiments, as shown in FIG. 1 , the flywheel energy storage and inertia transmission system 1 includes a first transmission shaft 41 and a second transmission shaft 42 . Wherein, the first transmission shaft 41 is used to connect the flywheel rotor 111 , the motor 112 and the moment of inertia input end 111 . The second transmission shaft 42 is used to connect the moment of inertia output end 212 and the generator 30 . The first transmission shaft 41 runs through the flywheel rotor 111 , one end is in driving connection with the output end of the motor 112 , and the other end is in driving connection with the moment of inertia input end 111 .

In the energy storage stage, the electric motor 112 realizes driving the flywheel rotor 111 to accelerate rotation by driving the first transmission shaft 41 . In the energy release stage, the rotation of the flywheel rotor 111 drives the first transmission shaft 41 to rotate, and transmits the moment of inertia to the inertia transmission device 20. After the inertia transmission device 20 changes speed, the second transmission shaft 42 drives the generator to generate electricity, and, During this process, the gear ratio of the inertia transmission device 20 is constantly adjusted to keep the rotational speed of the second transmission shaft 42 constant. In the standby stage, the flywheel rotor 111 drives the first transmission shaft 41 to rotate, and the flywheel rotor 111 releases a small amount of kinetic energy to keep the speed of the second transmission shaft 42 constant.

It can be understood that Fig. 1 is only an example of the flywheel energy storage and inertia transmission system 1 provided in the present disclosure. In other embodiments, the transmission relationship of the flywheel energy storage and inertia transmission system 1 may also have other modes, which are not limited here.

Optionally, in other embodiments, a connection device is provided between the flywheel rotor 111 and the inertia transmission device 20 , and a connection device is provided between the inertia transmission device 20 and the generator 30 .

Optionally, the connecting device may include one or more couplings, flanges, gears and the like.

The embodiment of the present disclosure also provides a control method of the flywheel energy storage and inertia transmission system 1. The control method of the flywheel energy storage and inertia transmission system 1 includes:

detecting the current rotational speed r of the flywheel rotor and/or the current frequency f of the grid;

According to r and/or f, control the flywheel rotor to store kinetic energy or release kinetic energy;

Wherein, when the flywheel rotor stores kinetic energy, the electric motor is controlled to absorb electric energy from the power grid to drive the speed of the flywheel rotor to increase, and the generator is disconnected from the power grid. When the flywheel rotor releases kinetic energy , controlling the motor to stand by, and the generator inputs stable electric energy to the grid.

That is to say, the control method of the flywheel energy storage and inertia conduction system 1 in the embodiment of the present disclosure includes judging whether the flywheel rotor 111 needs to store kinetic energy or release it according to at least one of the current rotational speed r of the flywheel rotor 111 and the current frequency f of the power grid. kinetic energy.

If it is judged that the flywheel rotor 111 needs to store kinetic energy, then the motor 112 is controlled to absorb electric energy from the grid, and the motor 112 drives the flywheel rotor 111 to increase the speed, and the electric energy is converted into kinetic energy and stored in the flywheel rotor 111. Meanwhile, during this process, the generator 30 is disconnected from the grid, that is, when the flywheel rotor 111 stores kinetic energy, the generator 30 does not transmit electric energy to the grid.

If it is determined that the flywheel rotor 111 needs to release kinetic energy, the motor 112 is controlled to stand by, that is, the motor 112 does not run, and it does not drive the flywheel rotor 111 to accelerate. The generator 30 operates under the drive of the output end of the inertia conduction device 20, and generates electric energy with a stable frequency. That is to say, in the energy release state, the output rotational speed of the inertia transmission device 20 remains constant, and the generator 30 can input stable electric energy to the grid at a constant rotational speed.

Optionally, the output rotational speed of the inertia transmission device 20 is constant at 3000 rpm, that is, the generator 30 can operate at a constant rotational speed of 3000 rpm to generate electric energy with a stable frequency.

Further optionally, the frequency of the current output by the generator 30 is 50 Hz, and the generator 30 can directly transmit power to the grid.

The control method of the flywheel energy storage and inertia conduction system provided by the embodiments of the present disclosure controls the flywheel rotor to store kinetic energy and release kinetic energy, so that the flywheel energy storage and inertia conduction system can participate in grid regulation, and the overflow energy can be stored in the flywheel rotor according to the overflow ratio Or draw energy from the flywheel rotor to supplement the power grid in proportion to the loss, reducing the frequency fluctuation of the power grid.

As shown in Figure 4, in some embodiments, the control method of the flywheel energy storage and inertia conduction system includes:

Set the preset speed threshold r' of the flywheel rotor 111, and control the flywheel rotor 111 to store kinetic energy, release kinetic energy or stand by according to r;

If r<r', control the flywheel rotor 111 to store kinetic energy;

If r>r', control flywheel rotor 111 to release kinetic energy;

If r=r', the motor 112 is controlled to be on standby and the generator 30 is disconnected from the grid, that is, the flywheel rotor 111 is on standby.

That is to say, when the speed of the flywheel rotor 111 does not reach the preset speed value, kinetic energy should be stored in the flywheel rotor 111 through the motor 112; Releasing kinetic energy to the flywheel rotor 111 and keeping the rotational speed of the flywheel rotor 111 at a preset value can enable it to cope with frequency fluctuations of the power grid in a better state, and also enable the flywheel rotor 111 to operate under good working conditions. Optionally, the value range of r' is 100rpm-1000000rpm.

As shown in Figure 5, in some embodiments, the control method of the flywheel energy storage and inertia conduction system includes:

Set the preset frequency threshold f' of the power grid, judge the size of f, and control the flywheel rotor 111 to store kinetic energy or release kinetic energy according to the size of f;

If f>f', control the flywheel rotor 111 to store kinetic energy;

If f＜f', control flywheel rotor 111 to release kinetic energy;

If f=f', the flywheel rotor 111 is controlled to release or store kinetic energy so that r remains equal to the preset speed threshold r'.

In order to cope with the frequency fluctuation of the power grid, a preset frequency threshold f' of the power grid is set, that is, an ideal frequency of the power grid. Optionally, f' is 50 Hz. When the frequency of the grid rises and exceeds f', the motor 112 absorbs electric energy from the grid, and drives the flywheel rotor 111 to increase its speed to store kinetic energy, so that the frequency of the grid gradually decreases to the ideal value f', and at the same time, the generator 30 is disconnected from the grid. Open the connection. When the frequency of the grid drops below f', the motor 112 is on standby, and the flywheel rotor 111 drives the generator 30 to generate electricity, and the generator 30 delivers electric energy with a stable frequency to the grid, so that the frequency of the grid gradually rises to the ideal value f' .

When the frequency of the power grid is equal to the preset frequency threshold f', the flywheel rotor 111 is controlled to release kinetic energy or store kinetic energy, that is, by releasing or storing kinetic energy, the speed of the flywheel rotor 111 is decreased or increased to maintain the preset speed threshold r', so that the flywheel rotor 111 can cope with the next power grid frequency fluctuation in the best state.

In some embodiments, the control method of the flywheel energy storage and inertia transfer system includes:

Set the preset frequency interval and preset frequency threshold f' of the power grid, the minimum frequency threshold of the preset frequency interval is f1, and the maximum frequency threshold is f2, where f1<f'<f2, judge whether f is within the preset frequency interval , if so, the flywheel energy storage and inertia conduction system enters the inertia response stage;

Enter the inertia response stage, judge the size of f, and control the flywheel rotor to store kinetic energy or release kinetic energy according to the size of f;

If f1≤f<f', control the flywheel rotor to release kinetic energy;

If f'<f≤f2, control the flywheel rotor to store kinetic energy;

If f=f', control the flywheel rotor to release or store kinetic energy so that r remains equal to the preset speed threshold r';

If f exceeds the preset frequency range, the flywheel energy storage and inertia conduction system 1 enters the frequency modulation stage;

Enter the frequency modulation stage, judge the size of f, and control the flywheel rotor to store kinetic energy or release kinetic energy according to the size of f;

If f>f2, control the flywheel rotor to store kinetic energy;

If f<f1, control the flywheel rotor to release kinetic energy.

Optionally, f1 is (50-0.033) Hz, and f2 is (50+0.033) Hz, that is, the preset frequency range is (50±0.033) Hz.

The flywheel energy storage and inertia conduction system 1 has an inertia response stage and a frequency modulation stage. When the frequency of the grid is greater than or equal to (50-0.033) Hz and less than or equal to (50+0.033) Hz, the flywheel energy storage and inertia conduction system 1 enters the inertia response stage . When the frequency of the power grid is less than (50-0.033) Hz or greater than (50+0.033) Hz, the flywheel energy storage and inertia conduction system 1 enters the frequency modulation stage.

After the flywheel energy storage and inertia conduction system 1 enters the inertia response stage, judge the current frequency f of the grid, if (50-0.033)Hz≤f<50Hz, control the flywheel rotor to release kinetic energy, if 50Hz<f≤(50+0.033 )Hz, control the flywheel rotor to store kinetic energy, if f=50Hz, control the flywheel rotor to release or store kinetic energy so that r remains equal to the preset speed threshold r', so that the flywheel rotor 111 can respond to the frequency of the next power grid in the best state fluctuation.

After the flywheel energy storage and inertia conduction system 1 enters the frequency modulation stage, judge the current frequency f of the power grid. If f>(50+0.033)Hz, control the flywheel rotor to store kinetic energy. If f<(50-0.033)Hz, control the flywheel The rotor releases kinetic energy.

As shown in Figure 6, in some embodiments, the control method of the flywheel energy storage and inertia conduction system includes:

Set the preset frequency range and preset frequency threshold f' of the power grid, the minimum frequency threshold of the preset frequency range is f1, and the maximum frequency threshold is f2, where f1<f'<f2, set the preset speed range and preset The speed threshold r', the minimum speed threshold of the preset speed range is r1, and the maximum speed threshold is r2, where r1<r'<r2,

Judging whether r is within the preset speed range;

If so, judge whether f is within the preset frequency range;

If yes, the flywheel energy storage and inertia conduction system enters the inertia response stage;

Enter the inertia response stage, judge the size of f, and control the flywheel rotor to store kinetic energy or release kinetic energy according to the size of f;

If f1≤f<f', control the flywheel rotor to release kinetic energy;

If f'<f≤f2, control the flywheel rotor to store kinetic energy;

If f=f', control the flywheel rotor to release or store kinetic energy so that r remains equal to r';

If f exceeds the preset frequency range, the flywheel energy storage and inertia conduction system enters the frequency modulation stage;

Enter the frequency modulation stage, judge the size of f, and control the flywheel rotor to store kinetic energy or release kinetic energy according to the size of f;

If f>f2, control the flywheel rotor to store kinetic energy;

If f<f1, control the flywheel rotor to release kinetic energy.

In the embodiment shown in Figures 4-6, it is first judged whether the rotational speed of the flywheel rotor 111 is within the preset rotational speed range, if the rotational speed of the flywheel rotor 111 is within the preset rotational speed range, then it is considered that the rotational speed of the flywheel rotor 111 is within the normal range It can participate in the frequency regulation of the power grid, that is, the flywheel energy storage and inertia conduction system 1 can enter the inertia response stage or frequency regulation stage. If the rotational speed of the flywheel rotor 111 exceeds the preset rotational speed range, it is determined that the flywheel energy storage and inertia transmission system 1 cannot enter the inertia response phase or the frequency modulation phase. This is because, if the rotational speed of the flywheel rotor 111 is too high, the flywheel rotor 111 will be damaged, and if the rotational speed of the flywheel rotor 111 is too small, the flywheel rotor 111 cannot effectively drive the generator 30 to generate electricity.

Further, as shown in Figure 6, the control method of the flywheel energy storage and inertia transmission system 1 also includes:

If r exceeds the preset speed range, control the flywheel rotor 111 to store kinetic energy, release kinetic energy or stand by according to r and f;

If f>f' and r<r1, control the flywheel rotor 111 to store kinetic energy, if f<f' and r>r2, control the flywheel rotor 111 to release kinetic energy, if f>f' and r>r2, or, f<f' And r<r1, the motor 112 is controlled to stand by and the generator 30 is disconnected from the grid.

Taking f' as 50 Hz as an example, when r<r1, the rotational speed of the flywheel rotor 111 is too low, and it is not suitable for the flywheel rotor 111 to release kinetic energy at this time. If f>50Hz, the flywheel rotor 111 can store kinetic energy, and the electric motor 112 absorbs the overflowed electric energy from the grid and stores it in the flywheel rotor 111. At this time, the flywheel rotor 111 can be rotated up, and the grid frequency can also be adjusted to lower the grid frequency. ; If f<50Hz, the flywheel rotor 111 is not suitable for releasing kinetic energy at this time, so the flywheel rotor 111 is controlled to enter the standby stage, that is, the motor 112 is controlled to stand by and the generator 30 is disconnected from the power grid. Optionally, wait for the next power grid As the frequency increases, kinetic energy can be stored for the flywheel rotor 111 .

When r>r2, the rotational speed of the flywheel rotor 111 is too high, and it is not suitable for the flywheel rotor 111 to absorb kinetic energy at this time. If f<50Hz, then the flywheel rotor 111 can release kinetic energy to drive the generator 30 to generate electricity and transmit power to the grid. At this time, the speed of the flywheel rotor 111 can be reduced to a normal value, and the grid frequency can also be adjusted to increase the grid frequency; if f >50Hz, at this time, the flywheel rotor 111 is not suitable for storing kinetic energy because the speed is too high, so the flywheel rotor 111 is controlled to enter the standby stage, that is, the motor 112 is controlled to stand by and the generator 30 is disconnected from the grid. Once the frequency drops, the flywheel rotor 111 can release kinetic energy to reduce the speed to the normal range.

In some embodiments, the control method of the flywheel energy storage and inertia conduction system further includes:

Set the preset threshold value of the output rotational speed of the inertia transmission device 20, and detect the input rotational speed of the inertia transmission device 20;

Calculate the ideal gear ratio of the inertia transmission device 20 according to the preset threshold value of the input speed and the output speed of the inertia transmission device 20;

The gear ratio of the inertia transmission device is regulated according to the ideal gear ratio.

Wherein, the input rotational speed of the inertia transmission device 20 is equal to the rotational speed of the flywheel rotor 111, and the ideal gear ratio of the inertia transmission device 20 is equal to the ratio of the input rotational speed of the inertia transmission device 20 to the preset threshold value of the output rotational speed, optionally, the preset threshold value of the output rotational speed is 3000 revolutions, that is, the engine 30 is always driven to generate electricity at a rotational speed of 3000 revolutions.

It can be understood that due to the continuous change of the rotational speed of the flywheel rotor 111 , that is, the input rotational speed of the inertia transmission device 20 is constantly changed. By adjusting the gear ratio of the inertia transmission device 20 , the rotational speed of the rotational inertia output end 212 can be kept constant without being affected by the change of the rotational speed of the flywheel rotor 111 . That is to say, in order to keep the rotational speed of the moment of inertia output end 212 constant, a preset value is set for the rotational speed of the moment of inertia output end 212, and the ideal gear ratio of the inertia transmission device 20 can be calculated according to the current rotational speed of the flywheel rotor 111 , and constantly adjust the gear ratio of the inertia transmission device 20 according to the ideal gear ratio, so as to realize that the rotational speed of the moment of inertia output end 212 can be kept constant, and the generator 30 can generate electricity stably.

When the rotational speed of the flywheel rotor 111 increases, in order to keep the rotational speed of the moment of inertia output end 212 constant, the gear ratio of the inertia transmission device 20 is increased; when the rotational speed of the flywheel rotor 111 decreases, in order to keep the rotational speed of the moment of inertia output end 212 constant, The gear ratio of the inertia transmission device 20 is decreased.

The composition, connection relationship and operation process of the flywheel energy storage and inertia transmission system 1 in several embodiments provided by the present disclosure will be described below by taking the schematic diagrams of the flywheel energy storage and inertia transmission system 1 shown in FIGS. 7-11 as examples.

Embodiment one:

In the embodiment shown in FIG. 7 , the flywheel energy storage and inertia transmission system 1 includes a flywheel energy storage unit 10 , an inertia transmission device 20 , a generator 30 , a first transmission shaft 41 and a second transmission shaft 42 . The flywheel energy storage unit 10 includes a flywheel rotor 111 and a motor 112 . The motor 112 , the flywheel rotor 111 , the inertia transmission device 20 and the generator 30 are all vertically arranged and arranged from bottom to top in the vertical direction. The rotation centerline of the first transmission shaft 41 , the rotation centerline of the second transmission shaft 42 and the rotation centerline of the flywheel rotor 111 coincide with each other, and all extend along the vertical direction. The vertical direction is represented by arrow A in FIG. 7 .

The flywheel rotor 111 is sleeved on the first transmission shaft 41 and connected thereto. The motor 112 is located on the side of the flywheel rotor 111 away from the inertia transfer device 20. One end of the first transmission shaft 41 is connected to the output end of the motor 112. The first The other end of the transmission shaft 41 is in transmission connection with the moment of inertia input end 211 . That is to say, the first transmission shaft 41 runs through the flywheel rotor 111, and the motor 112 and the inertia transmission device 20 are located on both sides of the flywheel rotor 111, or in other words, the flywheel rotor 111 is located between the motor 112 and the inertia transmission device 20 in a predetermined direction. between. The input end of the motor 112 is in drive connection with one end of the first transmission shaft 41. When the motor 112 is running, its input end drives the first transmission shaft 41 to rotate, and the first transmission shaft 41 thus drives the flywheel rotor 111 to rotate.

The generator 30 is located on the side of the inertia conduction device 20 away from the flywheel rotor 111 , one end of the second drive shaft 42 is in drive connection with the moment of inertia output 212 , and the other end of the second drive shaft 42 is in drive connection with the input end of the generator 30 . That is to say, the generator 30 and the flywheel rotor 111 are respectively located on both sides of the inertia conduction device 20, or in other words, the inertia conduction device 20 is located between the generator 30 and the flywheel rotor 111, and the rotation of the moment of inertia output 212 can drive the second With the rotation of the transmission shaft 42, the second transmission shaft 42 can drive the generator 30 to run. The generator 30 is directly connected to the power grid, and stably outputs constant frequency current to the power grid.

It can be understood that, in this embodiment, the transmission direction of the moment of inertia of the inertia transmission device 20 is fixed, that is, it is transmitted from the flywheel rotor 111 to the direction of the generator 30 . It should be noted that the generator 30 can also be used to convert the electrical energy in the grid into kinetic energy and transmit it to the flywheel rotor 111 in the form of inertia response. At this time, the moment of inertia output terminal 212 is used as the moment of inertia input section, and the moment of inertia input terminal 211 is used as the moment of inertia output terminal, and the moment of inertia is transmitted from the generator 30 to the direction of the flywheel rotor 111 .

In the energy storage stage, the electric motor 112 realizes driving the flywheel rotor 111 to accelerate rotation by driving the first transmission shaft 41 . In the energy release stage, the rotation of the flywheel rotor 111 drives the first transmission shaft 41 to rotate, and transmits the moment of inertia to the inertia transmission device 20. After the inertia transmission device 20 changes speed, the second transmission shaft 42 drives the generator to run and generate electricity, and, During this process, the gear ratio of the inertia transmission device 20 is constantly adjusted to keep the rotational speed of the second transmission shaft 42 constant. In the standby stage, the flywheel rotor 111 drives the first transmission shaft 41 to rotate, and the flywheel rotor 111 releases a small amount of kinetic energy to keep the speed of the second transmission shaft 42 constant. That is, the rotational speed of the second transmission shaft 42 can be kept constant.

Further, as shown in FIG. 7 , the flywheel energy storage and inertia transmission system further includes a vacuum chamber 50 to reduce windage wear of the flywheel rotor 111 . The flywheel rotor 111 and the motor 112 are all located in the vacuum chamber 50 , and the inertia conduction device 20 , the generator 30 and the second transmission shaft 42 are all located outside the vacuum chamber 50 . The first transmission shaft 41 passes through the vacuum chamber 50 , and a vacuum dynamic sealing structure is provided between the first transmission shaft 41 and the vacuum chamber 50 .

A specific embodiment of the flywheel energy storage unit 10 will be described below by taking FIG. 8 as an example. It can be understood that the flywheel energy storage unit 10 shown in FIG. 3 is only an example, and in other embodiments, the flywheel energy storage unit 10 can be other implementations known to those skilled in the art, which is not limited here.

As shown in FIG. 8 , the flywheel energy storage unit 10 is vertically arranged, the flywheel rotor 111 and the motor 112 are located in the vacuum chamber 50 , and the motor 112 includes a motor stator 1121 and a motor rotor 1122 .

The motor stator 1121 of the motor 112 is arranged on the inner wall of the vacuum chamber 50, and the motor rotor 1122 is arranged around the first transmission shaft 41 and connected thereto. The motor stator 1121 is opposite to the motor rotor 1122, and the rotation of the motor rotor 1122 can drive the first transmission shaft 41. rotation.

An axial bearing 51 is arranged between the flywheel rotor 111 and the vacuum chamber 50 . In the embodiment shown in FIG. 8 , the first transmission shaft 41 runs through the flywheel rotor 111 to enhance the structural stability of the flywheel energy storage unit 10 . A radial bearing 52 is co-located between the first transmission shaft 41 and the vacuum chamber 50 . Moreover, a dynamic sealing structure is also provided between the first transmission shaft 41 and the vacuum chamber 50 to ensure a high vacuum state in the vacuum sealing cavity.

The flywheel energy storage unit 10 also includes a radiator 60. The radiator 60 ensures that the temperature rise of each component of the flywheel energy storage unit 10 does not exceed the limit, so that the flywheel energy storage unit 10 can operate normally and stably.

The flywheel energy storage unit 10 also includes a motor power supply 70 for supplying power to the motor 112, and in some embodiments, the motor power supply 70 is connected to the grid.

The flywheel energy storage unit 10 also includes a vibration damping device 80, which abuts against the bottom of the vacuum chamber 50 to damp the vacuum chamber 50 and its internal components to improve the stability of the flywheel energy storage and inertial transmission system.

Further, the flywheel energy storage and inertia transmission system also includes a flywheel energy storage controller 101 . The flywheel energy storage controller 101 is used to control the energy input and input power of the flywheel energy storage unit 10, that is, the flywheel energy storage controller 101 is used to control whether to input electric energy to the flywheel energy storage unit 10, and is also used to control the flywheel energy storage unit 10. The power of the electrical energy input into the unit 10. Optionally, the flywheel energy storage controller 101 is powered by an independent power source to ensure that it will not be affected by fluctuations in the external power grid. Optionally, as shown in FIG. 9 , the flywheel energy storage controller 101 is connected between the motor power supply 70 and the motor 112 .

Optionally, a connection device is provided between the flywheel rotor 111 and the inertia transmission device 20 , and a connection device is provided between the inertia transmission device 20 and the generator 30 . That is to say, both the first transmission shaft 41 and the second transmission shaft 42 can be multi-segment shafts, and the segments can be connected by connecting devices. Optionally, the connecting device may include one or more couplings, flanges, gears and the like.

Embodiment two:

As shown in Figure 8 below, the flywheel energy storage and inertia conduction system provided by this embodiment is described as an example. The flywheel energy storage and inertia conduction system provided by this embodiment is basically similar in structure to the flywheel energy storage and inertia conduction system in Embodiment 1. The point is that in this embodiment, the flywheel rotor 111 , the inertia transmission device 20 , the first transmission shaft 41 and the motor 112 are all located inside the vacuum chamber 50 , and the generator 30 is located outside the vacuum chamber 50 . A part of the second transmission shaft 42 is located in the vacuum sealed cavity, and the other part passes through the vacuum sealed cavity, and a vacuum dynamic sealing structure is arranged between the second transmission shaft 42 and the vacuum chamber 50 . Locating the flywheel rotor 111 , the inertia transfer device 20 , the first transmission shaft 41 and the motor 112 in the vacuum chamber 50 can reduce the windage wear of the flywheel rotor 111 and increase the stability and efficiency of the flywheel operation.

Embodiment three:

This embodiment takes FIG. 10 and FIG. 11 as an example to describe a specific embodiment when the inertia transmission device 20 is a permanent magnet transmission device 210 with a continuously variable transmission function.

The permanent magnet transmission device 210 includes an inner magnetic ring 002 , a magnetic modulation ring 001 and an outer magnetic ring 003 . The inner magnetic ring 002, the magnetic adjustment ring 001 and the outer magnetic ring 003 are sequentially fitted from the inside to the outside and spaced apart from each other to form an air gap. The inner magnetic ring 002 is used as the moment of inertia input end 211 of the permanent magnet transmission 210 and is connected to the first transmission shaft 41 , and the magnet ring 001 is connected to the second transmission shaft 42 as the moment of inertia output 212 of the permanent magnet transmission 210 . Wherein, the outer magnetic ring 003 is rotatably arranged. The rotation of the outer magnetic ring 003 can change the transmission ratio of the permanent magnet transmission device 210 .

Specifically, as shown in FIGS. 10 and 11 , the permanent magnet transmission device 210 includes an inner magnetic ring 002 , a magnetic modulation ring 001 , an outer magnetic ring 003 and a stator 100 .

The inner magnetic ring 002 includes an inner magnetic ring permanent magnet 0021 , an inner magnetic ring iron core 0022 and an inner magnetic ring cylinder 0023 . The inner magnetic ring permanent magnet 0021 is arranged on the outer peripheral surface of the inner magnetic ring iron core 0022, and the inner magnetic ring iron core 0022 is sleeved on the inner magnetic ring cylinder 0023, and the inner magnetic ring cylinder 0023 plays a supporting role. That is to say, the inner magnetic ring permanent magnet 0021, the inner magnetic ring iron core 0022 and the inner magnetic ring cylinder 0023 are connected sequentially from outside to inside, wherein the inner magnetic ring permanent magnet 0021 is connected with the outer peripheral surface of the inner magnetic ring iron core 0022, and the inner magnetic ring The magnetic ring cylinder 0023 is connected with the inner peripheral surface of the inner magnetic ring core 0022 .

The outer magnetic ring 003 includes an inner permanent magnet 0031 of the outer magnetic ring, an iron core 0032 of the outer magnetic ring and an outer permanent magnet 0033 of the outer magnetic ring. The inner permanent magnet 0031 of the outer magnetic ring is arranged on the inner peripheral surface of the outer magnetic ring iron core 0032, and the outer permanent magnet 0033 of the outer magnetic ring is arranged on the outer peripheral surface of the outer magnetic ring iron core 0032. It can also be said that the inner permanent magnet 0031 of the outer magnetic ring , the outer magnetic ring iron core 0032 and the outer permanent magnet 0033 of the outer magnetic ring are connected sequentially from inside to outside.

The magnetic modulation ring 001 includes a skeleton and a magnetically permeable block embedded in the skeleton. The inner magnetic ring 002, the magnetic adjustment ring 001 and the outer magnetic ring 003 are sequentially fitted from the inside to the outside and spaced apart from each other to form an air gap. That is, the magnetic ring 001 is sleeved on the inner magnetic ring 002 and forms an air gap with the inner magnetic ring 002 , and the outer magnetic ring 003 is sleeved on the magnetic ring 001 and forms an air gap with the magnetic ring 001 . Moreover, the magnetically permeable block is opposite to the permanent magnet 0021 of the inner magnetic ring and the permanent magnet 0031 of the outer magnetic ring in the radial direction of the inner magnetic ring 002 .

The inner magnetic ring 002 is in transmission connection with the first transmission shaft 41, and the magnetic adjustment ring 001 is in transmission connection with the second transmission shaft 42, that is, the inner magnetic ring 002 is used as the input terminal (rotation inertia input terminal 211) of the permanent magnet transmission 210 to input the moment of inertia , the magnetic ring 001 is used as the output terminal (rotary inertia output terminal 212 ) of the permanent magnet transmission device 210 to output the moment of inertia, and the outer magnetic ring 003 is fixed or idling.

For example, the rotation of the flywheel rotor 111 drives the first transmission shaft 41 to rotate, the rotation of the first transmission shaft 41 drives the rotation of the inner magnetic ring 002, a magnetic field is formed between the inner magnetic ring 002 and the outer magnetic ring 003, and a magnetic field is formed between the outer magnetic ring 003 and the outer magnetic ring 003. The magnetic adjusting ring 001 between the inner magnetic rings 002 rotates under the action of the magnetic field and drives the rotation of the second transmission shaft 42, the magnetic adjusting ring 001 can cut the magnetic field lines between the outer magnetic ring 003 and the inner magnetic ring 002 to play a role in adjusting The role of magnetism realizes the ratio function of speed and power.

The stator 100 includes a stator core 110 and a winding 120. The stator core 110 includes an annular stator yoke and a plurality of stator teeth extending inward from the stator yoke and distributed along the circumferential direction of the stator yoke. The winding 120 is wound On the stator teeth, the stator 100 is sleeved on the outer magnetic ring 003 and spaced from the outer magnetic ring 003 to form an air gap. The outer magnetic ring 003 can be driven by the rotating magnetic field generated by the stator 100 and the rotation speed is adjustable.

Specifically, an air gap is formed between the outer permanent magnet 0033 of the outer magnetic ring and the inner peripheral surface of the stator 100, and the stator 100 is energized to generate a rotating magnetic field, and the outer permanent magnet 0033 of the outer magnetic ring tends to surround the outer magnetic ring 003 under the action of the rotating magnetic field. The central axis rotates, so that the entire outer magnetic ring 003 rotates around the central axis of the outer magnetic ring 003 driven by the rotating magnetic field.

The rotation of the flywheel rotor 111 drives the rotation of the first transmission shaft 41 and drives the rotation of the inner magnetic ring 002, and then the rotation of the inner magnetic ring 002 makes the magnetic field adjustment ring 001 cut the magnetic force lines between the outer magnetic ring 003 and the inner magnetic ring 002, and generates rotation The magnetic field drives the magnetic ring 001 to rotate and the rotation is output through the second transmission shaft 42, so that the kinetic energy output by the flywheel rotor 111 is transmitted to the second transmission shaft 42 through the first transmission shaft 41, thereby forming a non-contact magnetic gear transmission. The permanent magnet transmission device 210 has a stepless speed change function, and the rotating outer magnetic ring 003 can be used as a speed regulating ring to change the speed ratio between the inner magnetic ring 002 and the magnetic regulating ring 001, and the rotating magnetic field generated by the stator 100 can be regulated. The speed and direction of rotation of the outer magnetic ring 003.

The rotation of the outer magnetic ring 003 can change the transmission ratio of the permanent magnet transmission device 210 . Therefore, by controlling the rotating magnetic field, the gear ratio of the permanent magnet gear 210 can be regulated, and the gear ratio of the permanent magnet gear 210 can be kept at an ideal gear ratio, so that the speed of the second transmission shaft 42 can be kept constant.

The transmission ratio of the permanent magnet transmission device 210 is affected by the rotation of the outer magnetic ring 003 and changes, and the change rule is as follows:

When the outer magnetic ring 003 is stationary and the inner magnetic ring 002 rotates forward under the drive of the first transmission shaft 41, the gear ratio of the permanent magnet transmission device 210 is the first preset gear ratio;

When the inner magnetic ring 003 rotates forward under the drive of the first transmission shaft 41, and the outer magnetic ring 003 reverses and its speed is lower than the first preset speed, the speed ratio of the permanent magnet transmission device 210 is greater than the first preset speed ratio;

When the inner magnetic ring 003 rotates forward under the drive of the first transmission shaft 41, and the outer magnetic ring 003 reverses and its rotating speed is the first preset rotating speed, the output rotating speed of the permanent magnet transmission device 210 is equal to zero;

When the inner magnetic ring 003 rotates forward under the drive of the first transmission shaft 41, and the outer magnetic ring 003 reverses and its speed is greater than the first preset speed, the magnetic ring 001 reverses;

When the inner magnetic ring 003 is driven by the first transmission shaft 41 to rotate forward and the outer magnetic ring 003 to rotate forward, the speed ratio of the permanent magnet transmission device 210 is smaller than the first preset speed ratio.

Let the number of magnetic pole pairs of the inner magnetic ring 002 be P1, the number of magnetic pole pairs of the outer magnetic ring 003 be P2, the number of magnetic blocks of the magnetic adjustment ring 001 be P3, the inner magnetic ring 002, the outer magnetic ring 003 and the magnetic adjustment ring 001 satisfy the magnetic gear pole Logarithmic relationship, that is, P3=P1+P2.

In the embodiment shown in FIG. 10 and FIG. 11 , the inner magnetic ring 002 is the input end, the magnetic adjustment ring 001 is the output end, and the outer magnetic ring 003 is static or used as a speed adjustment ring (idling). The rotation direction of the outer magnetic ring 003 can be the same as that of the inner magnetic ring 002, or it can be opposite.

When the outer magnetic ring 005 is stationary, the transmission ratio of the permanent magnet transmission device 210 is . For example, in a specific embodiment, the number of magnetic pole pairs of the inner magnetic ring 004 is 2, the number of magnetic pole pairs of the outer magnetic ring 005 is 4, and the number of magnetic blocks of the magnetic regulating ring 002 is 6. Assuming that the rotating speed of the magnetic regulating ring 002 (generator Rotational speed) keeps constant 3000rpm, then has the following situations:

1. When the inner magnetic ring 004 rotates forward under the drive of the first rotating shaft 41 and the rotating speed is kept at 9000rpm, the magnetic adjusting ring 002 rotates forward (the rotation direction is the same as that of the inner magnetic ring 004), and the rotating speed of the magnetic adjusting ring 002 is maintained at 3000rpm. At this time, the outer magnetic ring 005 is stationary, and the gear ratio of the permanent magnet transmission device 210 is 3, that is, the first preset gear ratio is 3;

2. The inner magnetic ring 004 rotates positively under the drive of the first rotating shaft 41. When the rotating speed of the inner magnetic ring 004 is greater than 9000rpm and gradually increases, the outer magnetic ring 005 rotates and the direction of rotation is opposite to that of the inner magnetic ring 004 (reverse). Assuming that the first preset rotation speed is 94.5rpm, the rotation speed of the outer magnetic ring 005 is greater than 0 and less than 94.5rpm and gradually increases with the increase of the rotation speed of the inner magnetic ring 004. During this process, the gear ratio of the permanent magnet transmission device 210 is determined by 3 Gradually increase, and the speed of the magnetic adjustment ring 002 is kept at 3000rpm;

3. The inner magnetic ring 004 rotates positively under the drive of the first rotating shaft 41. When the rotating speed of the inner magnetic ring 004 is less than 9000rpm and gradually decreases, the outer magnetic ring 005 rotates in the same direction as the inner magnetic ring 004 (forward rotation). The speed of the magnetic ring 005 is greater than 0 and gradually increases as the speed of the inner magnetic ring 004 decreases. During this process, the gear ratio of the permanent magnet transmission device 210 is less than 3 and gradually decreases. The speed of the magnetic ring 002 is maintained at 3000rpm.

To sum up, when the outer magnetic ring 003 is fixed, the speed ratio of the permanent magnet transmission device 210 provided by the embodiment of the present disclosure is fixed, which is equivalent to the traditional permanent magnet transmission device 210 . When the outer magnetic ring 003 is idling, the outer magnetic ring 003 acts as a speed regulating ring, and its speed and direction of rotation affect the speed ratio.

It can be understood that when the rotation speed of the flywheel rotor 111 increases under the drive of the electric motor 112, the ideal gear ratio of the permanent magnet transmission device 210 is calculated according to the ratio between the rotation speed of the first transmission shaft 41 and the preset rotation speed of the second transmission shaft 42. Therefore, at this time, the gear ratio of the permanent magnet transmission device 210 should be adjusted to increase so that the gear ratio reaches the ideal gear ratio.

When the flywheel rotor 111 releases kinetic energy and the rotational speed decreases, the ideal speed ratio of the permanent magnet transmission device 210 calculated according to the ratio of the rotational speed of the first transmission shaft 41 to the preset rotational speed of the second transmission shaft 42 also decreases, so the permanent magnet transmission should be regulated The gear ratio of device 210 is reduced so that its gear ratio reaches the ideal gear ratio.

To sum up, when the speed of the flywheel rotor 111 increases, that is, when the input speed of the permanent magnet transmission device 210 increases, in order to keep the output speed constant, the transmission ratio of the permanent magnet transmission device 210 should be controlled to increase. When the rotation speed of the flywheel rotor 111 decreases, that is, when the input rotation speed of the permanent magnet transmission device 210 decreases, in order to keep the output rotation speed constant, the transmission ratio of the permanent magnet transmission device 210 should be decreased. Therefore, the flywheel energy storage and inertia conduction system 1 provided by the embodiment of the present disclosure can realize the output of constant-frequency current, and the constant-frequency current can be directly connected to the grid without power electronic devices.

As shown in FIG. 10 and FIG. 11 , the central axes of the first transmission shaft 41 , the second transmission shaft 42 , the inner magnetic ring 002 , the outer magnetic ring 003 , and the magnetic modulation ring 001 are all coincident with each other. The permanent magnet transmission device 210 also includes an inner magnetic ring flange 005, which is sleeved on the first transmission shaft 41 and connected with the inner magnetic ring cylinder 0023 so that the inner magnetic ring 002 and the first transmission shaft 41 can transmit connect. In this embodiment, the inner magnetic ring flange 005 includes two, and the two inner magnetic ring flanges 005 are respectively connected with the left and right ends of the inner magnetic ring cylinder 0023, so as to firmly connect the inner magnetic ring 002 with the first transmission Shaft 41 is connected. It can be understood that the present disclosure is not limited thereto, and the inner magnetic ring 002 can also realize transmission connection with the first transmission shaft 41 through other ways, which are not listed here.

The permanent magnet transmission device 210 includes a magnetic modulation ring support bearing 0041 and an inner support bearing 0042 , wherein the magnetic modulation ring support bearing 0041 is sheathed on the first transmission shaft 41 for supporting the magnetic modulation ring 001 . The inner support bearing 0042 is fit between the first transmission shaft 41 and the second transmission shaft 42 in the radial direction of the inner magnetic ring 002, in order to keep the coaxial between the first transmission shaft 41 and the second transmission shaft 42, and make the first transmission shaft 41 and the second transmission shaft 42 A transmission shaft 41 and the first transmission shaft 41 can rotate mutually.

Specifically, as shown in FIG. 10, in this embodiment, the first end (left end) of the second transmission shaft 42 is provided with a groove, and the first end (right end) of the first transmission shaft 41 is along the axis of the inner magnetic ring 002. Extending into the groove, the inner support bearing 0042 is located in the groove and sleeved on the first end of the first transmission shaft 41 . It is understood that the present disclosure is not limited thereto. For example, in other embodiments, the first end (right end) of the first transmission shaft 41 is provided with a groove, and the first end (left end) of the second transmission shaft 42 extends into the groove along the axial direction of the inner magnetic ring 002 , the inner support bearing 0042 is located in the groove and sleeved on the first end of the second transmission shaft 42 .

As shown in Fig. 10, the permanent magnet transmission device 210 includes a first magnetism regulating ring flange 0061 and a second magnetism regulating ring flange 0062, and the first magnetism regulating ring flange 0061 and the second magnetism regulating ring flange 0062 are all compatible with the regulating magnetism ring flange 0062. The magnetic rings 001 are connected and located on both sides of the inner magnetic ring 002 in the axial direction of the inner magnetic ring 002 . Among them, the first magnetic adjusting ring flange 0061 is sleeved on the second transmission shaft 42 and connected with the second transmission shaft 42 so that the magnetic adjusting ring 001 is connected with the second transmission shaft 42, and the second magnetic adjusting ring flange 0062 sets It is arranged on the support bearing 0041 of the magnetic modulation ring so that the first transmission shaft 41 can rotate relative to the second magnetic modulation ring flange 0062 .

That is to say, the magnetic adjusting ring 001 realizes transmission connection with the second transmission shaft 42 through the first magnetic adjusting ring flange 0061. In addition, the first magnetic adjusting ring flange 0061 also supports the magnetic adjusting ring 001, as shown in Fig. 10 As shown, the first magnetic modulation ring flange 0061 is connected to the right end of the magnetic modulation ring 001 and can support the right end of the magnetic modulation ring 001 . The second magnetic modulation ring flange 0062 is supported on the magnetic modulation ring support bearing 0041. Since the magnetic modulation ring support bearing 0041 is sleeved on the first transmission shaft 41, the second magnetic modulation ring flange 0062 and the first transmission shaft Relatively rotatable between 41. And, as shown in Figure 10, the second magnetism regulating ring flange 0062 is connected with the left end of the magnetism regulating ring 001, and can support the left end of the magnetism regulating ring 001, that is, the second magnetism regulating ring flange 0062 can be used without affecting the first When the transmission shaft 41 and the magnetic adjustment ring 001 rotate respectively, the support for the magnetic adjustment ring 001 is realized.

It can be understood that since the first magnetism adjusting ring flange 0061 and the second magnetism adjusting ring flange 0062 are respectively located on both sides of the inner magnetic ring 002 in the axial direction of the inner magnetic ring 002, that is, the first magnetism adjusting ring flange 0061 and the second magnetic ring flange 0062 have a certain interval in the axial direction of the inner magnetic ring 002, therefore, the magnetic ring 001 has two spaced apart support points in the axial direction of the inner magnetic ring 002, Therefore, the stability of the magnetic modulation ring 001 can be ensured, and the jumping of the magnetic modulation ring 001 during operation can be avoided. It can also be said that the first magnetic adjustment ring flange 0061 and the second magnetic adjustment ring flange 0062 jointly realize the stable support of the magnetic adjustment ring 001 .

As shown in FIG. 10 , the two inner magnetic ring flanges 005 are located between the first magnetic adjustment ring flange 0061 and the second magnetic adjustment ring flange 0062 in the axial direction of the inner magnetic ring 002 .

Further, the permanent magnet transmission device 210 includes a first outer magnetic ring support bearing 0043 and a second outer magnetic ring support bearing 0044 , and a first outer magnetic ring flange 0063 and a second outer magnetic ring flange 0064 . The first outer magnetic ring support bearing 0043 is sleeved on the first transmission shaft 41 , and the second outer magnetic ring support bearing 0044 is sleeved on the second transmission shaft 42 . Both the first outer magnetic ring flange 0063 and the second outer magnetic ring flange 0064 are connected to the outer magnetic ring core 0032 and are located on both sides of the magnetic ring 001 in the axial direction of the inner magnetic ring 002. The first outer magnetic ring The ring flange 0063 is sleeved on the first outer magnetic ring support bearing 0043 so that the first transmission shaft 41 can rotate relative to the first outer magnetic ring flange 0063, and the second outer magnetic ring flange 0064 is sleeved on the second outer magnetic ring support Bearing 0044 so that the second drive shaft 42 can rotate relative to the second outer magnetic ring flange 0064.

That is to say, the first outer magnetic ring support bearing 0043 and the second outer magnetic ring support bearing 0044 as well as the first outer magnetic ring flange 0063 and the second outer magnetic ring flange 0064 are arranged so that the first transmission shaft is not affected. 41. When the second transmission shaft 42 and the outer magnetic ring 003 rotate separately, the stable support of the outer magnetic ring 003 is realized.

As shown in Figure 10, the first magnetic ring flange 0061 and the second magnetic ring flange 0062 are located on the first outer magnetic ring flange 0063 and the second outer magnetic ring flange in the axial direction of the inner magnetic ring 002 Between 0064.

It should be noted that the permanent magnet transmission device 210 provided in this embodiment does not have high requirements on the size of the magnetic ring support bearing 0041, the first outer magnetic ring support bearing 0043 and the second outer magnetic ring support bearing 0044, so the above design is especially It is suitable for the permanent magnet transmission device 210 with a large diameter, and can meet the requirements of high torque and large size of the permanent magnet transmission device 210 of the hundred kilowatt level. This is because, if the magnetic ring 001 is sleeved on the magnetic ring 001 to support the magnetic ring 001, or the first outer magnetic ring support bearing 0043 or the second outer magnetic ring support bearing 0044 is sleeved on the outer magnetic ring 003 Supporting the outer magnetic ring 003 above puts forward higher requirements on the size of the magnetic ring support bearing 0041, the first outer magnetic ring support bearing 0043 or the second outer magnetic ring support bearing 0044, which increases the cost of equipment and the difficulty of production .

In the above embodiments, the inner support bearing 0042, the magnetic ring support bearing 0041, the first outer magnetic ring support bearing 0043, the second outer magnetic ring support bearing 0044, the inner magnetic ring flange 005, and the first magnetic ring flange The setting of 0061, the second magnetic ring flange 0062, the first outer magnetic ring flange 0063 and the second outer magnetic ring flange 0064 ensure the coaxiality of the permanent magnet transmission device 210, and at the same time ensure that the inner magnetic ring 002 and The stability of the air gap between the magnetic ring 001 and between the magnetic ring 001 and the outer magnetic ring 003 prevents the inner magnetic ring 002 and the magnetic ring 001 from scratching when they rotate, and ensures the permanent magnet transmission device 210. Running performance and running stability.

Optionally, a stepped structure is provided on the first transmission shaft 41 and the second transmission shaft 42 for installing bearings.

As shown in FIG. 10 and FIG. 11 , the permanent magnet transmission device 210 further includes a casing 130 , and the casing 130 is sleeved on the stator 100 .

Further, as shown in FIG. 11 , the pole pairs of the outer permanent magnet 0033 of the outer magnetic ring and the inner permanent magnet 0031 of the outer magnetic ring are equal, so that the permanent magnet transmission device 210 can output the maximum torque.

In describing the present disclosure, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientations or positional relationships indicated by "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying the referred devices or elements Must be in a particular orientation, constructed, and operate in a particular orientation, and thus should not be construed as limiting on the present disclosure.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In this disclosure, terms such as "installation", "connection", "connection" and "fixation" should be interpreted in a broad sense, for example, it can be a fixed connection or a detachable connection unless otherwise clearly defined and limited. , or integrated; can be mechanically connected, can also be electrically connected or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediary, can be the internal communication of two components or the interaction relationship between two components, Unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present disclosure according to specific situations.

In the present disclosure, unless otherwise clearly specified and limited, a first feature being “on” or “under” a second feature may mean that the first and second features are in direct contact, or that the first and second features are indirect through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In this disclosure, the terms "one embodiment," "some embodiments," "example," "specific examples," or "some examples" mean a specific feature, structure, material, or feature described in connection with the embodiment or example. Features are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present disclosure, and those skilled in the art can understand the above-mentioned embodiments within the scope of the present disclosure. The embodiments are subject to changes, modifications, substitutions and variations.

Claims (16)

A flywheel energy storage and inertia conduction system, characterized in that it comprises: A flywheel energy storage unit, the flywheel energy storage unit comprising a flywheel rotor and a motor; An inertia transmission device, the inertia transmission device is used to transmit the moment of inertia, the flywheel rotor is detachably connected to the inertia transmission device, and the output speed of the inertia transmission device can be kept constant; A generator, the inertia conduction device is detachably connected with the generator drive, the generator is used to be driven by the inertia conduction device to generate and output electric energy with a stable frequency. The flywheel energy storage and inertia conduction system according to claim 1, wherein the flywheel energy storage and inertia conduction system has an energy release state and an energy storage state, In the energy release state, the motor is on standby, the flywheel rotor is connected to the inertia transmission device to release kinetic energy, the inertia transmission device is connected to the generator to drive the generator to generate electricity, the The generator can input stable electric energy into the grid, In the energy storage state, the electric motor can absorb electric energy in the grid to drive the flywheel rotor to rotate and store kinetic energy, and the generator can stop inputting electric energy to the grid. The flywheel energy storage and inertia conduction system according to claim 2, wherein the inertia conduction device includes a moment of inertia input end and an inertia moment output end, and the flywheel rotor can be disconnected from the moment of inertia input end transmission connection, the output end of the moment of inertia can be disconnected from the generator, and the rotation speed of the output end of the moment of inertia can be kept constant, wherein in the state of energy release, the flywheel rotor and the moment of inertia The input end is drivingly connected to release kinetic energy, and the moment of inertia output end is drivingly connected to the generator to drive the generator to generate electricity. The flywheel energy storage and inertia conduction system according to claim 2 or 3, characterized in that, in the energy storage state, The generator is idling, and/or, the transmission connection between the flywheel energy storage unit and the inertia transmission device is disconnected, and/or, the rotational speed of the output end of the moment of inertia is zero, and/or, the The drive connection between the inertia transfer device and the generator is disconnected. The flywheel energy storage and inertia conduction system according to claim 1, characterized in that the flywheel energy storage and inertia conduction system has a standby state, and in the standby state, the motor is on standby and the generator is idling. The flywheel energy storage and inertia conduction system according to claim 1, wherein the inertia conduction device is a speed change device with an adjustable speed ratio so as to keep the output speed constant. The flywheel energy storage and inertia transmission system according to claim 6, wherein the inertia transmission device is a continuously variable transmission device. The flywheel energy storage and inertia transmission system according to claim 7, wherein the inertia transmission device is a permanent magnet transmission device, a hydraulic transmission device, a magneto-rheological fluid device, a gear transmission device, or a magnetic coupling transmission device , Rotation asynchronous adjustable speed change device or double-feed asynchronous adjustable speed change device. The flywheel energy storage and inertia transmission system according to claim 8, wherein the inertia transmission device is a permanent magnet transmission device, and the permanent magnet transmission device includes: The inner magnetic ring, the magnetic adjustment ring and the outer magnetic ring, the inner magnetic ring, the magnetic adjustment ring and the outer magnetic ring are sequentially fitted from the inside to the outside and spaced from each other to form an air gap, and the outer magnetic ring includes The inner permanent magnet of the outer magnetic ring, the iron core of the outer magnetic ring and the outer permanent magnet of the outer magnetic ring connected in sequence; a stator, the stator is sleeved on the outer magnetic ring and is spaced from the outer magnetic ring to form an air gap, the outer magnetic ring can be driven by the rotating magnetic field generated by the stator, and the rotation speed is adjustable; and The input shaft and the output shaft, the inner magnetic ring is in drive connection with the input shaft, the magnetic adjusting ring is in drive connection with the output shaft, the flywheel rotor is detachably in drive connection with the input shaft, the An output shaft is disconnectably drivingly connected to the generator. The flywheel energy storage and inertia conduction system according to claim 1, wherein the inertia conduction device includes a moment of inertia input end and an inertia moment output end, and the flywheel rotor can be disconnected from the moment of inertia input end In a drive connection, the moment of inertia output end is detachably connected to the generator, wherein the rotational speed of the moment of inertia output end can be kept constant. The flywheel energy storage and inertia transmission system according to claim 2, characterized in that it comprises a first transmission shaft and a second transmission shaft, the first transmission shaft connects the flywheel rotor, the motor and the moment of inertia At the input end, the second transmission shaft is connected to the output end of the moment of inertia and the generator. The flywheel energy storage and inertia conduction system according to claim 1, further comprising a flywheel energy storage controller configured to control the energy input and input frequency of the flywheel energy storage unit. The flywheel energy storage and inertia conduction system according to claim 12, wherein the flywheel energy storage controller comprises: A power grid detection module, the power grid detection module is used to detect the current frequency and state of the power grid; A motor control module, the motor control module is used to control the opening and closing and input and output power of the motor according to the current frequency and state of the power grid. The flywheel energy storage and inertia conduction system according to claim 6, further comprising an inertia conduction controller, the inertia conduction controller being used to regulate the speed change ratio of the inertia conduction device, comprising: an input speed detection module, the input speed detection module is used to detect the input speed of the inertia transmission device; A calculation module, the calculation module is used to calculate the ideal speed ratio of the inertia transmission device according to the input speed of the inertia transmission device and the preset value of the output speed; A variable speed ratio control module, the variable speed ratio control module is used for regulating the variable speed ratio of the inertia transmission device according to the ideal variable speed ratio. The flywheel energy storage and inertia conduction system according to claim 1, wherein the output speed of the inertia conduction device is constant at 3000 rpm, and the frequency of the current output by the generator is 50 Hz. The flywheel energy storage and inertia conduction system according to claim 15, wherein the output speed of the inertia conduction device is constant at 3600 rpm, and the frequency of the current output by the generator is 60 Hz.

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