KR102046045B1 - Renewable energy storage system and operating method thereof - Google Patents

Abstract

A renewable energy storage system and method of operation thereof are provided. The renewable energy storage system is located between a hydrolysis device that consumes power to produce hydrogen, and a renewable energy device that generates power as a renewable energy source and the hydrolysis device, and receives first power supplied from the renewable energy device. A battery energy storage device including a power conversion unit for adjusting to a second power for providing to the solution and a power storage unit for storing the second power, and power of the renewable energy generation output P (t) and the battery energy storage device; The storage amount B (t) is monitored and based on the monitoring result of the renewable energy generation output P (t) and the power storage amount B (t) of the battery energy storage device, the battery energy storage device is connected to the electrolytic device. Determine whether or not to operate the electrolyzer device by providing a second power, and control the electrolyzer device to be supplied with a second power to operate according to the determination, or And a control device which controls to store a second power to the power storage unit of the storage device.

Description

Renewable energy storage system and operating method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a renewable energy storage system and a method of operating the same, and more particularly, to a renewable energy storage system and a method of operating the electrolytic device using renewable energy.

Renewable energy, such as solar and wind power, is drawing attention as an alternative to fossil fuels and nuclear power, and various techniques for solving the variability of renewable energy have been proposed. In addition, hydrogen is also receiving much attention as a clean energy source, but the fossil fuel reforming method is being used to meet the current demand is increasing the demand for hydrogen production method that does not depend on fossil fuel.

Water electrolysis is a method of decomposing water using electricity to obtain hydrogen. The principle has been known for a long time, but it seems inefficient because it uses electricity belonging to secondary energy. However, after hydrogen was recognized as an energy source due to the development of fuel cell technology, hydrolysis has begun to be applied as one of the hydrogen production technologies utilizing renewable energy.

The energy storage device (ESS) is generally used in the electrochemical method represented by the current battery. Although it is stored in the form of electric energy, it has the advantage of high efficiency and convenient use throughout the energy storage method.However, due to the high frequency of use (charge / discharge), the service life is relatively short and the period for storing energy is not long. There is this.

When a hydroelectric device whose main purpose is to produce hydrogen is associated with a renewable energy source, it must be designed with a large capacity to fully accommodate the output range of the renewable energy source. In this case, while the renewable energy has an operation rate of 20-30%, the hydroelectric device is a waste of cost because it depends on the output of the renewable energy, even though the installed capacity can be fully utilized. In addition, the electrolytic device is produced because the electrode damage caused by the reverse reaction occurs when the on / off is repeated, and the crossover of hydrogen and oxygen gas occurs when the power is supplied below a certain level You can't use hydrogen.

Therefore, the amount of renewable energy not included in the operating power range of the electrolytic device is discarded. In addition, when the renewable energy output falls below a certain level required by the electrolysis device due to its own change, the phenomenon occurs frequently that the electrolysis device stops starting, which causes a decrease in the life of the electrolysis device itself. In particular, the frequency of output fluctuations of the renewable energy may occur within seconds, and the speed (response speed) in which the electrolytic apparatus correspondingly adjusts the output ranges from several seconds to several tens of seconds. When the renewable energy source and the electrolytic device are directly connected, not only the electrolyzed device cannot extinguish the output fluctuations of the renewable energy, but also disturb the electric device inside the electrolyzed device, causing durability deterioration.

Registration No. 10-0968224, Residential Renewable Energy-Renewable Fuel Cell Composite System, released December 3, 2009

The present invention provides a renewable energy storage system and a method of driving the same, which not only make full use of surplus power of renewable energy exceeding a requirement of a system or a load, but also stably supply power to an electrolytic device for a long time.

Renewable energy storage system according to one aspect, is located between a hydroelectric device that consumes power to produce hydrogen, and between the renewable energy device and the electrolytic device that generates power as a renewable energy source, A battery energy storage device including a power conversion unit for adjusting the first power to the second power for providing the power receiving device and a power storage unit for storing the second power, renewable energy generation output (P (t)) and battery energy The battery energy storage device monitors the power storage amount B (t) of the storage device and based on the monitoring result of the renewable energy generation output P (t) and the power storage amount B (t) of the battery energy storage device. Determine whether or not to operate the electrolytic device by providing a second power source to the electrolytic device, and control the electrolytic device to receive and operate the second , Includes a hydrogen storage device and a control device which controls to store a second power to the power storage unit of a battery energy storage system, for storing hydrogen produced in the power reception device to.

Control apparatus renewable generation output (P (t)) to at least the power reception power consumption (E _L) or more and _{(P (t) ≥E L)} , the electric power storage unit including electric power storage amount in the battery energy storage system of the device ( When B (t)) is greater than or equal to the amount of power B _L that can guarantee operation of the electrolytic device for a period of time (B (t) ≥B _L ), the battery energy storage device provides the second power to the electrolytic device. Can be controlled to operate the electrolytic device.

The minimum amount of power B _L that can guarantee the operation of the electrolytic device for a certain period of time is the sum of the minimum power consumptions E _{x L of} each electrolytic module when the electrolytic device is composed of a plurality of electrolytic modules. E _L ) may be set as a multiple.

The control device monitors the renewable energy generation output P (t) while the hydrolysis device is in operation, and when the renewable energy generation output P (t) exceeds the operating range of the hydrolysis device, the battery The energy storage device may be controlled to store power beyond the operating range of the electrolytic device to prevent damage to the electrolytic device.

The control device monitors the renewable energy generation output P (t) while the hydrolysis device is in operation, and the battery energy when the renewable energy generation output P (t) becomes smaller than the operating range of the hydrolysis device. It is possible to control the storage device to provide electric power to the electrolytic device so as to prevent operation of the electrolytic device due to the change in the renewable energy generation output P (t).

When the electrolytic device is composed of a plurality of electrolytic modules, the control device monitors the renewable energy generation output P (t) and the power storage amount B (t) and based on the monitoring result, the plurality of electrolytic modules Can be controlled to sequentially shut down sequentially.

When the electrolytic device is composed of the first electrolytic module and the second electrolytic module, the power consumption E (t) of the electrolytic device becomes smaller than the minimum value E _{L of the} power consumption of the electrolytic device. When the power storage amount B (t) is smaller than the minimum amount of power B _L that can guarantee the operation of the electrolytic device for a certain time, the control device commands the stop of the first electrolytic module of the electrolytic device. Change the minimum amount of power (B _L ) that can guarantee the operation of the electrolytic device set and controlled by the control device to 1 / 2B _L, and change the minimum power consumption (E _L ) of the electrolytic device to 1 / 2E _L. Power consumption of the electrolytic device at time t using the values of the renewable energy generation output P (t), the power storage amount B (t) and the hydrogen storage amount H (t) of the hydrogen storage device. Calculate E (t)), and when the calculated power consumption of the electrolytic device (E (t)) becomes smaller than the set minimum power consumption (E _L ') The controller can command the stop of the second electrolytic module of the electrolytic device.

The control device monitors the renewable energy generation output P (t) and the power storage amount B (t) of the power storage unit included in the battery energy storage device, and at the beginning of operation of the electrolytic device, t)) is preferentially stored in the battery energy storage device, and the electrolytic device can be controlled to maximize the internal reaction efficiency of the electrolytic device by operating at the lowest possible capacity.

When the electrolytic device is composed of a plurality of electrolytic modules, the control device monitors the number of On / Off times of each of the plurality of electrolytic modules, and the renewable energy generation output P (t) is 0 and When the power storage amount B (t) of the power storage unit included in the battery energy storage device decreases below a minimum power amount B _L that can guarantee the operation of the electrolytic device 130 for a predetermined time, It is possible to control to equalize the performance of each electrolytic module by first stopping the electrolytic modules having a low number of on / off.

According to another aspect of the present invention, there is a water electrolysis device that consumes power to produce hydrogen, a battery energy storage device located between a renewable energy device that generates power as a renewable energy source, and a hydrolysis device, and a battery energy device and an electrolysis device. A method of operating a renewable energy storage system including a control device for controlling and a hydrogen storage device for storing hydrogen produced by the electrolytic device, wherein the battery energy storage device is supplied with a first power produced from the renewable energy device. Adjusting the first power to a second power for providing the electrolytic device, and the control device monitoring the renewable energy generation output P (t) and the power storage amount B (t) of the battery energy storage device; And the control device based on the monitoring result of the renewable energy generation output P (t) and the power storage amount B (t) of the battery energy storage device. Determining whether or not to operate the electrolyzer device by causing the apparatus to provide a second power source to the electrolyzer device, and wherein the control device causes the electrolyzer device to receive and operate a second power source from the battery energy storage device according to the determination. Or controlling to store the second power in the battery energy storage device.

According to the present invention, it is possible to not only make the most of the surplus power of renewable energy exceeding the required amount of the system or the load, but also to stably supply power to the electrolytic apparatus for a long time.

In addition, according to the present invention, it is possible to prevent sudden start stop of the electrolytic device due to lack of power, thereby improving the life expectancy of the electrolytic device.

1 is a block diagram showing the configuration of a renewable energy storage system according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating an example of a configuration of the battery energy storage device of FIG. 1.
FIG. 3 is a diagram illustrating an example of the configuration of the electrolytic apparatus of FIG. 1.
4 is a diagram illustrating an example of a configuration of the control device of FIG. 1.
5 is a flowchart illustrating an operation of the renewable energy storage system of FIG. 1.
6 is a flowchart illustrating the operation of the control device of FIG. 1 in detail.
FIG. 7 is a flowchart illustrating a method in which the control device stops the operation of the electrolytic device when the electrolytic device of FIG. 1 is constituted by a plurality of electrolytic modules.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to intention or custom of a user or an operator. Therefore, the definition should be made based on the contents throughout the specification.

1 is a block diagram showing the configuration of a renewable energy storage system according to an embodiment of the present invention.

The renewable energy storage system 100 may include a control device 110, a battery energy storage device 120, a hydrolysis device 130, and a hydrogen storage device 140.

The renewable energy device 10 may generate power from renewable energy sources such as solar light, wind power, and hydropower, and provide the power to the system 30 or the load 40.

The battery energy storage device 120 is located in the renewable energy device 10 and the electrolytic device 130. The battery energy storage device 120 converts power that is not consumed by the system 30 or the load 40 among the power generated by the renewable energy device 10 into direct current power that can be stored and utilized by the electrolytic device 130. It can be provided to the electrolytic device 130.

The electrolytic device 130 generates hydrogen and oxygen by electrolyzing water using electrical energy supplied from the battery energy storage device 120, that is, electric power. Hydrogen generated in the electrolytic device 130 is collected in the hydrogen storage device 140. Hydrogen in the hydrogen storage device 140 may be delivered to and used by a hydrogen consumption device 20 such as a fuel cell.

The control device 110 includes the power generation output P (t) of the renewable energy device 10 and the required power of the system 30 or the load 40, and the power storage amount B (t) of the battery energy storage device 120. ) And the hydrogen storage amount (H (t)) of the hydrogen storage device 140 in real time, and control the operation of the battery energy storage device 120, the electrolytic device 130 and the hydrogen storage device 140. have. When the hydrogen consumption device 20 connected to the hydrogen storage device 140 is included in the system 10, the control device 110 may additionally control the operation of the hydrogen consumption device 20.

Hydrogen in the hydrogen storage device 140 may be provided to and consumed by the hydrogen consumption device 20. The hydrogen consuming device 20 may be a fuel cell, for example. A fuel cell (not shown) includes a fuel cell stack (not shown) that converts hydrogen into electrical energy, and a fuel cell output converter (not shown) and an auxiliary device (not shown) for directing the direct current power of the fuel cell stack to the grid. May not be used).

In addition, the control device 110 monitors the renewable energy generation output P (t) and the power storage amount B (t) of the battery energy storage device 120, and regenerates at the initial stage of operation of the electrolytic device 130. The energy generation output P (t) is preferentially stored in the battery energy storage device 120, and the electrolytic device 130 is controlled to maximize the internal reaction efficiency of the electrolytic device 130 by operating at the lowest capacity possible. can do.

2 is a diagram illustrating an example of a configuration of the battery energy storage device 120 of FIG. 1.

The battery energy storage device 120 may include a power converter 210 and a power storage 220. The power converter 210 may convert the supplied power into a DC power that the power storage unit 220 and the electrolysis device 130 may store and utilize. The power storage unit 220 charges the remaining portion that is not used by the electrolysis device 130 when surplus power is generated, and discharges power when the power is not supplied from the renewable energy source to supply power to the electrolysis device 130. have.

When the maximum output under the installed capacity of the renewable energy device 10 is P _M , the power convertible amount P _C of the power converter 210 of the battery energy storage device 120 does not have a separate transmission and wiring element. It may be equal to the maximum output (P _M ) of the renewable energy device 10.

The maximum power storage amount of the power storage unit 220 is referred to as B _M , and when the allowable storage power amount is B _H , the allowable storage power amount B _H is supplied from the renewable energy device 10 at the maximum power storage amount B _M. It may be a value excluding a margin for controlling the short-term fluctuation of power. In addition, the power storage unit 220 may manage by setting the amount of power that can ensure the operation of the electrolytic device 130 for a predetermined time to the minimum amount of power (B _L ). The minimum amount of power B _L of the power storage unit 220 may be set to a multiple of the minimum power consumption E _L of the electrolytic device 130. In addition, the minimum amount of power B _L of the power storage unit 220, as described with reference to FIG. 3, when the power receiving device 130 includes a plurality of power receiving modules, the minimum power consumption of each power receiving module. It can be set as a multiple of the sum E _L of (E _xL ). Here, x represents the number (ID) of each electrolytic module determined according to the number of electrolytic modules.

The power storage amount of the battery energy storage device 120, that is, the power storage amount (or charge amount) B (t) of the power storage unit 220 is continuously monitored by the control device 110. To this end, the power storage unit 220 may transmit the power storage amount B (t) information of the power storage unit 220 to the control device 110 in real time.

In addition, the control device 110, when the power storage amount (B (t)) of the battery energy storage device 120 exceeds a predetermined first level, the power storage unit 220 of the battery energy storage device 120 In order to secure the storage capacity of the control unit to temporarily increase the output of the electrolytic device 130, when the power storage amount (B (t)) of the battery energy storage device 120 is less than a second predetermined level, the renewable energy Irrespective of the power generation output P (t), the operating power of the electrolytic device 130 may be fixed to a minimum to secure an extra capacity of the power storage unit 220 of the battery energy storage device 120.

The first level is a portion for absorbing the sudden power rise of the renewable energy source, the power storage unit 220 is subtracted a certain portion from the total capacity (B _M ). The predetermined part may be determined differently according to the type of renewable energy and the output capacity P _M. The second level is a value specified between the first level and the minimum power amount B _L and is a value that varies depending on the type of renewable energy, the trend of generation amount, and the maximum output P _M of the renewable energy device 10. The electrolytic apparatus 130 should not be operated below the minimum value E _{L of the} power consumption of the electrolytic apparatus 130.

FIG. 3 is a diagram illustrating an example of the configuration of the electrolytic apparatus 130 of FIG. 1.

As shown in FIG. 3, the electrolytic device 130 may be composed of a plurality of individual electrolytic modules 310 and 320. In FIG. 3, there are two electrolytic modules 310 and 320, but the number of the electrolytic modules may vary. Each electrolytic module 310, 320 may be individually turned on / off and output controlled by the control device 110 of FIG. 1. The first electrolytic module 310 includes a first DC power supply unit 312, a first electrolytic stack 314, and an auxiliary device (not shown), and the second electrolytic module 320 includes a second DC power supply. The power supply unit 322, the second electrolytic stack 324, and an auxiliary device (not shown) may be included. The first and second DC power supply units 312 and 322 may be connected to the power converter 210 and the power storage unit 220 of the battery energy storage device 120 of FIG. 2.

An auxiliary device (not shown) is a pure water supply pump for supplying purified water to the electrolytic stacks 314 and 324, which separates oxygen and water generated while supplying water to the electrolytic stacks 314 and 324. Additional equipment required for general electrolysis, such as pure water tanks, circulation pumps for circulating water, hydrogen gas purification systems, water removal systems, and metering systems for safety, may be included. In addition, the hydrogen stored in the hydrogen storage device 140 further includes a compressor (not shown) for transporting the produced hydrogen to the outside of the system and a compression device for compressing and storing hydrogen in the vehicle (not shown). When the amount is greater than or equal to a predetermined level, the hydrogen storage amount may be maintained within a predetermined range through a vehicle (not shown) under the control of the control device 110.

The first DC power supply unit 312 may supply DC power passed through the power converter 210 of FIG. 2 to the first electrolytic stack 314. The first electrolytic stack 314 may produce hydrogen using the supplied electric power. Similarly, the second DC power supply unit 322 may supply DC power passed through the power converter 210 of FIG. 2 to the second electrolytic stack 324. The second electrolytic stack 324 may produce hydrogen using the supplied power.

The electrolytic device 130 includes a first electrolytic module 310 and a second electrolytic module 320, the power consumption of the first electrolytic module 310 is called E ₁ , and the second electrolytic module power consumption (E) of the power reception by the device 130 when the power consumption of 320 to as E ₂ is the first power reception by the module power consumption of (310) (E ₁₎ and the second power reception by module 320 It may be expressed as a sum of power consumption E ₂ . In addition, when the maximum value of the power consumption of the first electrolytic module 310 is E _1M and the minimum value of the power consumption of the first electrolytic module 310 is E _1L , the minimum value of the power consumption E _1L is It may be set to about 20% of the maximum value E _1M of power consumption.

The maximum value of the power consumption of the power reception by the device (130) (E _M) is a first power reception to the maximum value of the power consumption of the module (310) (E _M1) and the second maximum value of the power consumption of the power reception by module 320 (E _M2 ), the minimum value E _L of the power consumption of the electrolytic device 130 is the minimum value E _{lL of the} power consumption of the first electrolytic module 310 and the second _electrolytic module ( It may be represented as the sum of the minimum value E _2L of 320.

The control apparatus 110 can monitor the renewable energy generation output P (t) while the electrolytic apparatus 130 is operating. The control device 110 exceeds the operating range of the electrolytic device 130 in the battery energy storage device 120 when the renewable energy generation output P (t) exceeds the operating range of the electrolytic device 130. The electric power may be stored so as to prevent damage to the electrolytic device 130. Here, the operating range of the electrolytic device 130 represents an allowable range of input power (here, renewable energy generation output P (t)) in which the electrolytic device 130 can operate normally.

The control apparatus 110 monitors the renewable energy generation output P (t) while the electrolytic device 130 is operating, and the renewable energy generation output P (t) is received by the electrolytic device 130. When it is smaller than the operating range of, the battery energy storage device 120 provides the operating power of the electrolytic device 130, and the electrolytic device 130 is caused by a change in the renewable energy generation output P (t). Control can be prevented.

In addition, when the electrolytic device 130 is composed of a plurality of electrolytic modules 310 and 320, the control device 110 is the power of the renewable energy generation output (P (t)) and the battery energy storage device 120. The storage amount B (t) may be monitored and based on the monitoring result, the plurality of electrolytic modules 310 and 320 may be selectively shut down sequentially.

In addition, when the electrolytic device 130 is composed of a plurality of electrolytic modules 310 and 320, the control device 100 monitors the number of On / Off of each of the plurality of electrolytic modules, When the renewable energy generation output P (t) is 0 and the power storage amount B (t) of the power storage unit 220 included in the battery energy storage device 120 decreases below a predetermined level, the ON It is possible to control to equalize the performance of each electrolytic module by first stopping the electrolytic modules having a small number of on / off times. Here, the predetermined level may be the minimum amount of power (B _L ) that can guarantee the operation of the electrolytic device 130 for a predetermined time.

The hydrogen storage device 140 of FIG. 1 may be configured to store the hydrogen produced in each of the electrolytic stacks 321 and 322.

4 is a diagram illustrating an example of a configuration of the control device 110 of FIG. 1.

The control device 110 may include a transceiver 410, an operation controller 420, and a storage 430. The transmitter / receiver 410 is a renewable energy generation output P (t) at time t of the renewable energy device 10 of FIG. 1, and the charge / discharge power C (t of time t of the power storage unit 220 of FIG. 2. )), the power storage amount B (t) information at time t, and the hydrogen storage amount H (t) of the hydrogen storage device at time t.

In addition, the transceiver 410 may receive the power consumption E (t) of the electrolytic device 130 at time t from the electrolytic device 130. To this end, the DC power supply units 312 and 322 of the electrolytic apparatus 130 may detect the power consumption E (t) of the electrolytic apparatus 130 and transmit the same to the transceiver 410. The power consumption E (t) of the electrolytic device 130 at time t is the power consumption E ₁ (t) of the first electrolytic module 310 and the power consumption of the second electrolytic module 320 ( May be the sum of E ₂ (t)). The charging / discharging power C (t) at time t of the power storage unit 220 of FIG. 2 is the power consumption of the electrolytic device 130 at time t from the renewable energy generation output P (t) at time t. This value is obtained by subtracting E (t)).

Alternatively, the data processor 410 may determine the power consumption E (t) of the electrolytic device 130 at time t of the renewable energy generation output P (t) at time t and the power storage unit 220. The power storage amount B (t) information at time t and the hydrogen storage amount H (t) of the hydrogen storage device 140 at time t may be calculated. The power consumption E (t) of the electrolytic device 130 at time t may be calculated according to Equation 1.

[Equation 1]

Here, when the power storage unit 220 is discharged (B (t) <B _L ) to the extent that the renewable energy short-term output fluctuations can not be solved or the storage amount of the hydrogen storage device 140 is the maximum (H (t ) = H _M ) can be commanded to stop the receiving device 130 for the safety of the system 100 itself, the power consumption (E (t)) is zero. The charge amount B (t) of the power storage unit 220 increases or decreases according to the charge / discharge amount C (t) at the previous time, and the hydrogen storage amount H (t) is produced by the water electrolysis device 130. The amount of hydrogen is added continuously. H _M represents the maximum storage capacity of the hydrogen storage device 140. dH (t) represents the hydrogen production amount of the electrolytic device 130 at time t, and is a value automatically determined by the power consumption E (t) of the electrolytic device 130 at time t.

The driving controller 420 may control the operations of the battery energy storage device 120, the hydrolysis device 130, and the hydrogen storage device 140 by using the information collected through the transceiver 410. The driving control unit 420 may include a battery energy storage device 120 control module (not shown) and a water electrolysis device for controlling each of the battery energy storage device 120, the electrolytic device 130, and the hydrogen storage device 140. 130 may be configured as a set of detailed control modules such as a control module (not shown) and a hydrogen storage device 140 control module (not shown). The operation control unit 420 controls each of the power converter 210 and the power storage unit 220 of the battery energy storage device 120, and the DC power supply units 312 and 322 and the electrolysis device of the power receiver device 130. It can be configured to control each of the stacks 314, 324.

The storage unit 430 may store information received by the transceiver 410, information monitored by the driving controller 420, and preset information required for the operation of the driving controller 420.

FIG. 5 is a flowchart illustrating an operation of the renewable energy storage system 10 of FIG. 1.

The battery energy storage device 120 receives the first power produced from the renewable energy device 10 and adjusts the power to the second power for providing the first power to the receiving device (510).

The control device 110 monitors the renewable energy generation output P (t) and the power storage amount B (t) of the power storage unit 220 in the battery energy storage device 120 (520).

The control device 110 based on the monitoring result of the renewable energy generation output (P (t)) and the power storage amount (B (t)) of the power storage unit 220 in the battery energy storage device 120. The control unit 120 determines whether to operate the electrolytic device 130 by causing 120 to provide the second power to the electrolytic device 130.

The control device 110 controls the electrolytic device 130 to receive the second power from the battery energy storage device 120 to operate according to the determination, or to store the second power in the battery energy storage device (540). ).

FIG. 6 is a flowchart illustrating the operation of the control device 110 of FIG. 1 in detail.

The battery energy storage device 120 receives and stores the first power generated from the renewable energy device 10 and adjusts the power to the second power for providing the renewable energy to the electrolysis device 130. In such a state, the control device 110 generates a power storage amount B (B () of the renewable energy generation output P (t) and the battery energy storage device 120 (or the power storage unit 220 of the battery energy storage device 120). t)) Receive information (610).

Control device 110 renewable generation output (P (t)) to at least the power reception device, the power consumption of (130) (E _L) or more and _{(P (t) ≥E L)} (620), battery energy storage device When the power storage amount B (t) of 120 is equal to or greater than the amount of power B _L that can guarantee the operation of the receiving apparatus 130 for a predetermined time (B (t) ≥ B _L ) 630, the power receiving unit The solution 130 is ordered to operate (640). The amount of power B _L that can guarantee the operation of the electrolytic device 130 for a predetermined time may be a preset value as a multiple of the minimum value E _{L of the} power consumption of the electrolytic device 130, as described above. The change may be set according to an input signal or a situation of the system 110.

The control device 110 has a renewable energy generation output P (t) less than the minimum power consumption E _L of the electrolysis device 130 (P (t) < E _L ) 620, or battery energy storage. When the power storage amount B (t) of the device 120 is smaller than the power amount B _L that can guarantee the operation of the electrolytic device 130 for a predetermined time (B (t) <B _L ) 630. ), The power storage unit 220 of the battery energy storage device 120 may be instructed to charge the second power.

The control device 110 sets the power consumption E (t) of the electrolytic device 130 at time t to the renewable energy generation output P (t) at time t, and the power at time t of the power storage unit 220. The storage amount B (t) information and the hydrogen storage amount H (t) of the hydrogen storage device 140 at time t are continuously input and monitored (660).

The control apparatus 110 uses the above-described Equation 1 to generate the renewable energy generation output P (t) at time t, the power storage amount B (t) at time t of the power storage unit 220, and t. The power consumption E (t) of the electrolytic device 130 at time t may be calculated using the value of the hydrogen storage amount H (t) of the hydrogen storage device 140 at time 670. In this step, the control device 100 determines that the charge / discharge amount C (t) of the battery energy storage device 120 (or the power storage unit 220) is the renewable energy generation output P (t) and the electrolytic device ( 130 can be calculated from the power consumption E (t), and B (t + 1) can be estimated using the sufficient electric charge amount C (t). Operation 670 is continuously performed until operation 680, such that the renewable energy generation output P (t), the power storage amount B (t) of the power storage unit 220, and the storage amount H (H) of the hydrogen storage device 140 are performed. Based on t)), the power consumption E (t) of the electrolytic device 130 may be continuously changed or modified, and weather information or an external control signal may be reflected in the operation power determination.

When the determined power consumption E (t) of the electrolytic device 130 becomes smaller than the minimum value E _L of the power consumption E (t) of the electrolytic device 130 ( E (t) < E _L , that is, when the power storage unit 220 is determined to be discharging (680), it is instructed to stop the operation of the electrolytic device 130 (690), and the system 100 is in a standby state. System 100 enters standby mode (695). In the standby mode, operation 610 is continuously performed, and if the conditions of operations 620 and 630 are met, the operation of the electrolytic device 130 may be ordered (640).

FIG. 7 is a flowchart illustrating a method in which a control device stops the operation of the electrolytic device 130 when the electrolytic device 130 of FIG. 1 is configured of a plurality of electrolytic modules.

Assume that there is no renewable energy generation output P (t) in the energy storage system 100 in which the electrolytic device 130 is composed of two electrolytic modules 310 and 320 having the same capacity.

This situation can be represented by Equation 2.

[Equation 2]

P (t) = 0, x = 2, E _1M = E _2M , E _1L = E _2L , E (t) = E ₁ (t) + E ₂ (t)

The same reference numerals in the flowchart of FIG. 6 of the reference numerals shown in the flowchart of FIG. 7 denote the operation of the blocks of the same reference numerals of the flowchart of FIG.

When the determined power consumption E (t) of the electrolytic device 130 becomes smaller than the minimum value E _L of the power consumption E (t) of the electrolytic device 130 ( E (t) <E _L , that is, when the power storage unit 220 is determined to be discharging (680), the power storage amount B (t) at time t of the battery energy storage device 120 is for a predetermined time. If it is smaller than the minimum amount of power B _L that can guarantee the operation of the electrolytic device 130 (710), the control device 110 stops the stopping of the first electrolytic module 310 of the electrolytic device 130. Command 720. In this case, the first electrolytic module 310 may be a hydrolytic module having a smaller number of on / off times than the second electrolytic module 320.

The minimum amount of power B _L that can guarantee the operation of the electrolytic device 130 managed by the control device 110 is changed to 1 / 2B _L , and the minimum power consumption E _L of the electrolytic device 130 is changed. ) Is set to 1 / 2E _L (730). B _L ′ represents the minimum amount of power capable of ensuring the operation of the changed electrolytic device 130, and E _L ′ represents the minimum power consumption of the changed electrolytic device 130.

Operation 670 of FIG. 6 is continuously performed, and as shown by operation 740 of FIG. 7, the control device 110 uses P (t), B (t), and H ( Using the value of t), the power consumption E (t) of the electrolytic device 130 at time t is calculated (740). In addition, the control device 110, the charge and discharge amount (C (t)) of the power storage unit 220 is the renewable energy generation output (P (t)) and the power consumption (E (t)) of the electrolysis device 130 Can be calculated from

When the power consumption E (t) of the electrolytic device 130 is smaller than the minimum power consumption E _L ′ of the set electrolytic device 130 (750), the control device 110 receives the electrolytic device ( Command 760 to stop the second electrolytic module 320 of 130.

On the other hand, when the determined power consumption E (t) of the electrolytic device 130 is greater than or equal to the minimum value E _L of the power consumption E (t) of the electrolytic device 130 (680), the control device ( 110 continues operation 660 of FIG. 6 to monitor the system. When the power storage amount B (t) at the time t of the battery energy storage device 120 is maintained above the minimum amount of power B _L that can guarantee the operation of the electrolytic device 130 for a predetermined time (710). The control apparatus 110 instructs the operation stop of the electrolytic apparatus 130 (690). According to Equation 1, when E (t) < E _L even though B (t) &gt; B _L , H (t) = H _M. That is, since the capacity of the hydrogen storage device 140 is exceeded, at this time, the operation of the water receiving device 130 may be terminated for safety.

According to the present invention, it is possible to reduce the variability of the renewable energy source through the capacity sharing with the battery energy storage device 120 and to improve the utilization rate of the electrolytic device 130. Electrolytic device after 120 hours when the electrolytic device to process the renewable energy output alone and when the electrolytic device 130 and the battery energy storage device 120 is 1: 1 distributed as in the present invention Comparing the utilization rate of 130, the battery energy storage device 120 and the electrolytic device 130 is improved to 68.1% when the battery energy storage device 120 and the electrolytic device 130 share capacity 1: 1 compared to 52.6% when only the electrolytic device is configured. Can be. In addition, the remaining energy is stored in the battery, the utilization rate of the electrolytic device 130 considering the remaining energy is calculated as 77.2%. As such, the combination of the battery energy storage device 120 may be seen to be more advantageous in terms of energy utilization.

According to the present invention, it is possible to improve the life of the electrolytic device by reducing the number of on / off of the electrolytic device 130. When the electrolytic device 130 is supplied with electric power below a predetermined level (about 20%) of the rated capacity, gas crossover occurs, which not only degrades the quality of the produced hydrogen, but also greatly increases the internal oxidation risk. Thus, generally, the electrolytic device 130 shuts down and purges the interior before power less than the minimum capacity is supplied. When the on / off operation of the electrolytic device 130 is checked, when the battery energy storage device 120 is combined, even when there is little or no renewable energy output, that is, even in a section in which the operation stops using only the electrolytic device. Power is applied to maintain the operating state.

In addition, according to the present invention, it is possible to expand the operating range and increase the efficiency of the electrolytic device 130 by configuring a plurality of modules rather than configuring a single electrolytic device 130 in a single stack. When combining the electrolytic device 130 and the battery energy storage device 120 to utilize renewable energy, the electrolytic device 130 may be configured as a plurality of modules rather than a single stack. It is possible to improve the operation performance of the), and to control the charging and discharging range of the battery energy storage device 120 through the module-specific control of the electrolytic device 130 can improve the life of the whole system. In particular, the more difficult it is to predict the renewable energy output, the more the utility of modular construction increases. In addition, when the power of the battery energy storage device 120 is insufficient, the module receiving device 130 may have a different effect of reducing the number of operation / end cycles by changing the end time of the module. In addition, even if performing maintenance on the individual module has the advantage that the electrolytic device 130 itself can be continuously operated.

In addition, the electrolytic stacks 314 and 324 have a property of increasing efficiency in a range lower than the rated capacity due to internal resistance. Since the electrolytic device 130 may receive the first-order DC power that is primarily ordered by the power converter included in the battery energy storage device 120, the water-receiving device 130 may track the maximum efficiency within the limit of the charge / discharge capacity. Driving is possible. In actual operation, the power supply should be determined according to the output trend of renewable energy, the capacity of the electric energy storage device and the weather information.

One aspect of the invention may be embodied as computer readable code on a computer readable recording medium. Codes and code segments implementing the above program can be easily deduced by computer programmers in the art. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical disk, and the like. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

The above description is only one embodiment of the present invention, and those skilled in the art may implement the present invention in a modified form without departing from the essential characteristics of the present invention. Therefore, the scope of the present invention should not be limited to the above-described examples, but should be construed to include various embodiments within the scope equivalent to those described in the claims.

110: control device 120: battery edge storage device
130: electrolytic device 140: hydrogen storage device
210: power conversion unit 220: power storage unit
310: first electrolytic module 320: second electrolytic module
410: transceiver unit 420: operation control unit

Claims (11)

An electrolytic device that consumes power to produce hydrogen;
A power conversion unit and a second power, which is located between a renewable energy device that generates power as a renewable energy source and the electrolytic device, adjusts the first power supplied from the renewable energy device to a second power for providing the electrolytic device. Battery energy storage device including a power storage unit for storing;
The renewable energy generation output P (t) and the power storage amount B (t) of the battery energy storage device are monitored, and the renewable energy generation output P (t) and the power storage amount B (t) of the battery energy storage device. Based on the monitoring result of)), the battery energy storage device provides a second power source to the electrolytic device to determine whether to operate the electrolytic device, and according to the determination, the electrolytic device is supplied with the second power to operate. A control device for controlling or storing the second power in the power storage unit of the battery energy storage device; And
A hydrogen storage device for storing hydrogen produced in the electrolytic device; Including,
When the electrolytic device is composed of a first electrolytic module and a second electrolytic module,
When the power consumption E (t) of the electrolytic device becomes smaller than the minimum value E _L of the power consumption of the electrolytic device, the power storage amount B (t) ensures the operation of the electrolytic device for a predetermined time. If it is smaller than the minimum amount of power (B _L )
The control device instructs the stop of the first electrolytic module of the electrolytic device,
Change the minimum amount of power (B _L ) that can guarantee the operation of the managed electrolytic device to 1 / 2B _L, and change the minimum power consumption (E _L ) of the electrolytic device to 1 / 2E _L and,
Power consumption (E (t)) of the electrolytic device at time t from the values of renewable energy generation output (P (t)), power storage amount (B (t)) and hydrogen storage amount (H (t)) of the hydrogen storage device. , And
If the calculated power consumption E (t) of the electrolytic device is smaller than the minimum set power consumption E _L ′ of the changed electrolytic device, the control device commands the stop of the second electrolytic module of the electrolytic device. ,
Herein, the control device sets the power consumption E (t) of the electrolytic device at time t to the renewable energy generation output P (t) at time t, and the power storage amount B (t) at time t of the power storage unit. Information and the hydrogen storage amount (H (t)) of the hydrogen storage device at time t,
[Equation 1]

Calculate using
From here,

B _L represents the minimum amount of power that can guarantee the operation of the electrolytic device over a period of time,
When the power storage unit is discharged to the extent that the renewable energy short-term output fluctuation cannot be solved (B (t) <B _L ), or when the storage amount (H (t)) of the hydrogen storage device reaches a maximum (H _M ) (H ( t) = H _M ), the control device commands the stop of the electrolytic device, so that the power consumption E (t) of the electrolytic device is zero. The method of claim 1,
Control apparatus renewable generation output (P (t)) to at least the power reception power consumption (E _L) or more and _{(P (t) ≥E L)} , the electric power storage unit including electric power storage amount in the battery energy storage system of the device ( When B (t)) is greater than or equal to the amount of power B _L that can guarantee operation of the electrolytic device for a period of time (B (t) ≥B _L ), the battery energy storage device provides the second power to the electrolytic device. And controlling the electrolytic device to operate. The method of claim 2,
The minimum amount of power B _L that can guarantee the operation of the electrolytic device for a certain period of time is the sum of the minimum power consumptions E _{x L of} each electrolytic module when the electrolytic device is composed of a plurality of electrolytic modules. Renewable energy storage system, characterized in that it is set to a multiple of E _L ). The method of claim 1,
The control device monitors the renewable energy generation output P (t) while the hydrolysis device is in operation, and when the renewable energy generation output P (t) exceeds the operating range of the hydrolysis device, the battery And storing energy in the energy storage device that exceeds the operating range of the electrolytic device to prevent damage to the electrolytic device. The method of claim 1,
The control device monitors the renewable energy generation output P (t) while the hydrolysis device is in operation, and the battery energy when the renewable energy generation output P (t) becomes smaller than the operating range of the hydrolysis device. And controlling the storage device to provide power to the electrolytic device, thereby preventing the electrolysis device from being shut down due to a change in the renewable energy generation output (P (t)). The method of claim 1,
When the electrolytic device is composed of a plurality of electrolytic modules,
The control device monitors the renewable energy generation output P (t) and the power storage amount B (t), and controls to selectively shut down the plurality of electrolytic modules based on the monitoring result. Renewable Energy Storage System. delete The method of claim 1,
The control device monitors the renewable energy generation output P (t) and the power storage amount B (t) of the power storage unit included in the battery energy storage device, and at the beginning of operation of the electrolytic device, t)) is preferentially stored in the battery energy storage device, and the electrolytic device is operated at the lowest capacity possible to maximize the internal reaction efficiency of the electrolytic device. The method of claim 1,
When the electrolytic device is composed of a plurality of electrolytic modules, the control device monitors the number of On / Off times of each of the plurality of electrolytic modules, and the renewable energy generation output P (t) is 0 and When the power storage amount B (t) of the power storage unit included in the battery energy storage device decreases below a minimum power amount B _L that can guarantee the operation of the electrolytic device for a predetermined time, On / Off (On) / Off) Renewable energy storage system that controls the number of hydrostatic modules with a low number of priorities to equalize their performance. A hydrolysis device that consumes power to produce hydrogen, a battery energy storage device located between the renewable energy device that generates power as a renewable energy source and the hydrolysis device, and a control device that controls the battery energy device and the electrolysis device. And, as a method of operation of a renewable energy storage system including a hydrogen storage device for storing hydrogen produced in the electrolytic device,
The battery energy storage device includes receiving a first power produced from the renewable energy device and adjusting the first power to a second power for providing the electrolytic device;
The control device includes monitoring the renewable energy generation output P (t) and the power storage amount B (t) of the battery energy storage device;
The control device causes the battery energy storage device to provide the second power to the electrolytic device based on the monitoring result of the renewable energy generation output P (t) and the power storage amount B (t) of the battery energy storage device. Determining whether to operate the device; And
The control device may control the receiving device to operate by receiving the second power from the battery energy storage device or to store the second power in the battery energy storage device according to the determination; Including,
When the electrolytic device is composed of a first electrolytic module and a second electrolytic module,
When the power consumption E (t) of the electrolytic device becomes smaller than the minimum value E _L of the power consumption of the electrolytic device, the power storage amount B (t) ensures the operation of the electrolytic device for a predetermined time. If less than the minimum amount of power B _L that can be made, the control device instructs the stop of the first electrolytic module of the electrolytic device;
Change the minimum amount of power (B _L ) that can guarantee the operation of the managed electrolytic device to 1 / 2B _L, and change the minimum power consumption (E _L ) of the electrolytic device to 1 / 2E _L Doing;
Power consumption (E (t)) of the electrolytic device at time t from the values of renewable energy generation output (P (t)), power storage amount (B (t)) and hydrogen storage amount (H (t)) of the hydrogen storage device. Calculating; And
If the calculated power consumption E (t) of the electrolytic device is smaller than the minimum set power consumption E _L ′ of the changed electrolytic device, the control device commands to stop the second electrolytic module of the electrolytic device. More steps,
Herein, the control device sets the power consumption E (t) of the electrolytic device at time t to the renewable energy generation output P (t) at time t, and the power storage amount B at time t of the battery energy storage device B (t). )) Information and the hydrogen storage amount (H (t)) of the hydrogen storage device at time t,
[Equation 1]

Calculate using
From here,

B _L represents the minimum amount of power that can guarantee the operation of the electrolytic device over a period of time,
When the battery energy storage device is discharged to the extent that the renewable energy short-term output fluctuations cannot be resolved (B (t) <B _L ), or the storage amount (H (t)) of the hydrogen storage device reaches a maximum (H _M ) ( H (t) = H _M ), the control device commands the stop of the electrolytic device, so that the power consumption (E (t)) of the electrolytic device becomes zero. The method of claim 10,
Control apparatus renewable generation output (P (t)) and the power reception to the minimum power consumption of the device (E _L) or higher _{(P (t) ≥E L)} , the power storage amount (B (t)) of the battery energy storage device When the amount of power (B _L ) or more (B (t) ≥ B _L ) that can guarantee the operation of the electrolytic device during this period of time (B (t) ≥ B _L ), the battery energy storage device provides a second power to the electrolytic device, thereby A method of operating a renewable energy storage system, characterized in that the control to operate.

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