WO2019015152A1

WO2019015152A1 - Electromagnetic repulsion-based actuating mechanism, energy storage module for same, and energy storage device

Info

Publication number: WO2019015152A1
Application number: PCT/CN2017/106938
Authority: WO
Inventors: 钟建英; 黄瑜珑; 程铁汉; 余占清; 高树同; 卢敬伟; 刘卫东
Original assignee: 平高集团有限公司; 清华大学; 北京平高清大科技发展有限公司; 国家电网公司
Priority date: 2017-07-18
Filing date: 2017-10-19
Publication date: 2019-01-24
Also published as: CN109273294A

Abstract

An electromagnetic repulsion-based actuating mechanism, energy storage module for same, and energy storage device. The electromagnetic repulsion-based actuating mechanism comprises a voltage conversion module (302), an energy storage unit, a drive coil (305), and a buffer coil (308). The energy storage unit comprises two energy storage modules (303, 306) connected to the drive coil and the buffer coil, respectively. Each of the energy storage modules comprises an energy storage capacitor, a charging circuit, and a discharging circuit, wherein the charging circuit and the discharging circuit are connected to two ends of the energy storage capacitor, respectively, the discharging circuit is composed of a thyristor having one end connected to the energy storage capacitor and another end connected to an excitation coil of the electromagnetic repulsion-based actuating mechanism. The electromagnetic repulsion-based actuating mechanism has a simple control circuit, a high level of automation, superior reliability, and excellent interference resistance.

Description

Electromagnetic repulsive operating mechanism, energy storage module and energy storage device thereof

Cross-reference to related applications

The present application is based on a Chinese patent application filed on Jan. 18, 2017, the entire disclosure of which is hereby incorporated by reference.

Technical field

The invention belongs to the technical field of power equipment, and particularly relates to an electromagnetic repulsion operating mechanism, an energy storage module thereof and an energy storage device.

Background technique

At present, the multi-terminal DC transmission system of the voltage source type converter station does not need the DC circuit breaker to isolate the DC side fault line by electromagnetic repulsion, and ensure reliable power supply to the normal line by each converter station. Generally, the operating time of the DC circuit breaker mainly depends on the operating time of the mechanical switch operating mechanism. Therefore, the electromagnetic repulsion operating mechanism is one of the current research hot issues.

The electromagnetic repulsion operating mechanism mainly includes three key units: a driving unit, a buffer unit and a holding unit. Among them, the driving unit needs to drive the mechanical switch moving contact to accelerate in the early stage of closing and closing; the buffer unit needs to decelerate the moving contact in the later stage of closing and closing to avoid strong impact of the moving contact and improve its mechanical life; The unit needs to provide a holding force for the moving contact to stabilize it in the split and close position. The electromagnetic repulsive drive has the characteristics of short response time and fast moving speed, and can be used as a driving unit and a buffer unit to realize electromagnetic driving and electromagnetic buffering of the mechanical switching moving contact.

The principle of the electromagnetic repulsion operating mechanism is that the pre-charged storage capacitor discharges to the closing or closing excitation coil, and induces eddy current on the metal disk. The magnetic field generated by the eddy current is opposite to the magnetic field generated by the discharge current in the coil, and the electromagnetic repulsion is generated. , thereby driving the metal disk to drive the mechanical switch moving contact Move away from the coil to achieve the opening and closing. Therefore, the energy storage and triggering equipment of the electromagnetic repulsion operating mechanism is the key to its energy storage and control.

At present, the control switch for controlling the discharge of the capacitor in the electromagnetic repulsive drive is an ordinary electronically controlled thyristor, and the drive circuit of the electronically controlled thyristor is electrically connected with the capacitor discharge circuit, and the drive circuit has poor anti-electromagnetic interference capability, which easily leads to mis-conduction of the electronically controlled thyristor and leads to mechanical The malfunction of the switch. In addition, after a switching operation is completed, the pre-charging capacitor in the electromagnetic repulsive drive needs to be recharged. In the conventional manner, the contact switch control power supply is used to recharge the capacitor, which is not only complicated to control, but also due to the contact switch. There are problems such as pre-breakdown, which is easy to cause electromagnetic interference to surrounding equipment.

Summary of the invention

The object of the embodiments of the present invention is to provide an electromagnetic repulsion operating mechanism, an energy storage module thereof, and an energy storage device, which are used for automatic energy storage of an electromagnetic repulsion operating mechanism, and the thyristor is automatically turned off after discharge, and the prototype test proves that the work is completed. reliability.

An embodiment of the present invention provides an energy storage module of an electromagnetic repulsion operating mechanism, including: a storage capacitor, a charging circuit, and a discharging circuit, wherein a charging circuit and a discharging circuit are respectively connected at two ends of the storage capacitor, and the discharging circuit is The thyristor is configured such that one end of the thyristor is connected to the storage capacitor and the other end is connected to a driving coil or a buffer coil of the electromagnetic repulsion operating mechanism.

The thyristor is a light-controlled thyristor.

The charging circuit includes a diode and a resistor, and the cathode of the diode is connected to the storage capacitor through a resistor.

The charging circuit further includes a switch, one end of the switch is connected to the diode cathode, and the other end of the switch is connected to the storage capacitor, and the switch, the resistor and the storage capacitor form an energy consumption loop.

The embodiment of the invention further provides an energy storage device for an electromagnetic repulsion operating mechanism, comprising a voltage conversion module and an energy storage module connected thereto, the energy storage module comprising a storage capacitor, a charging circuit and a discharging circuit, wherein the charging circuit And a discharge circuit respectively connected to the two ends of the storage capacitor, the discharge circuit is composed of a thyristor, one end of the thyristor is connected to the storage capacitor, and the other end is connected The driving coil or the buffer coil of the electromagnetic repulsion operating mechanism.

The thyristor is a light-controlled thyristor.

The charging circuit further includes a switch, one end of the switch is connected to the cathode of the diode, and the other end of the switch is connected to the storage capacitor, and the switch, the resistor and the storage capacitor form an energy consumption loop.

The embodiment of the invention further provides an electromagnetic repulsive operating mechanism, comprising a voltage conversion module, an energy storage unit, a driving coil and a buffer coil, wherein the voltage conversion module is connected to the energy storage unit, and the energy storage unit comprises two energy storage modules. The two sets of energy storage modules are respectively connected to the driving coil and the buffer coil, and each group of energy storage modules comprises a storage capacitor, a charging circuit and a discharging circuit, wherein the charging circuit and the discharging circuit are respectively connected to the storage capacitors The discharge circuit is composed of a thyristor, one end of the thyristor is connected to the storage capacitor, and the other end is connected to the drive coil or the buffer coil.

The thyristor is a light-controlled thyristor.

The drive coil and the buffer coil are coils for closing or opening.

The beneficial effects of using the embodiment of the present invention are: after the storage capacitor discharges to zero at its terminal voltage, the freewheeling action of the excitation coil is used to reversely charge the storage capacitor, generating a negative pressure drop of several hundred volts to ensure light. The control diode is reliably turned off. Because the control circuit of the embodiment of the invention is simple, high in automation, good in reliability, and has strong anti-interference ability, the electromagnetic repulsion and closing operation of the electromagnetic repulsive mechanism can be realized, and the movable contact can be reliably performed. Electromagnetic drive and electromagnetic buffering, and complete automatic energy storage in a short time after the end of one operation, the next time the opening and closing is done Ready.

DRAWINGS

1 is a schematic structural view of an electromagnetic repulsive operating mechanism;

2 is a schematic view of an energy storage device of an electromagnetic repulsion operating mechanism;

3 is a schematic view of an energy storage device of another electromagnetic repulsive operating mechanism.

Detailed ways

The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings.

An embodiment of an electromagnetic repulsion operating mechanism of the present invention.

The utility model comprises a voltage conversion module, an energy storage unit, a driving coil and a buffer coil, wherein the voltage conversion module is connected with the energy storage unit, and the energy storage unit comprises two energy storage modules, wherein the two energy storage modules are respectively connected with the driving coil and the buffer coil, and each of the two A set of energy storage modules includes a storage capacitor, a charging circuit and a discharge circuit, wherein the charging circuit and the discharging circuit are respectively connected at two ends of the storage capacitor; the discharging circuit is composed of a thyristor, one end of the thyristor is connected to the storage capacitor, and the other end is connected The driving coil or the buffer coil is connected; the charging circuit includes a diode and a resistor, and the cathode of the diode is connected to the storage capacitor through a resistor, and the resistor is set to prevent an overcurrent generated by the charging circuit.

The control drive coil is used to realize the electromagnetic drive of the mechanical switch moving contact of the electromagnetic repulsive operating mechanism, so that the movable contact accelerates, and the control buffer coil is used to decelerate the movable contact in the later stage of splitting and closing, to avoid moving contact Strong impact and increase its mechanical life. In order to realize the flexible and accurate control of the moving contact, the energy storage unit can be provided with multiple sets of energy storage modules to assist the acceleration or deceleration of the moving contact.

In order to completely discharge the storage capacitor during fault repair, the charging circuit needs to be provided with a switch. One end of the switch is connected to the cathode of the diode, and the other end of the switch is connected to the storage capacitor. Therefore, the switch, the resistor and the storage capacitor form an energy-consuming circuit to enable storage. The capacitor discharges through a resistor and a switch.

Specifically, as shown in FIG. 1 , the electromagnetic repulsion operating mechanism includes a voltage conversion module, and an energy storage unit connected to the voltage conversion module, for opening Or the closing drive coil and buffer coil. The energy storage unit includes two energy storage modules, that is, the energy storage module 303 and the energy storage module 306. Each of the energy storage modules has the same structure, including a storage capacitor, a charging circuit, a discharging circuit, an input interface, and an output interface.

Taking the energy storage module 303 as an example, the charging circuit includes a diode D1, a resistor R1, a switch K1, an anode of the diode D1 connected to the input interface, and one end of the cathode connection resistor R1. The two ends of the resistor R1 are connected to the storage capacitor C1, and one end of the switch K1 Connect the diode D1 cathode, the other end is connected to the storage capacitor C1; the discharge circuit of the energy storage module 303 comprises a light-controlled thyristor T1, the anode is connected with a resistor R1, a storage capacitor C1, and the cathode is connected to the output interface 304; the output interface is connected to the drive Coil 305. As shown in FIG. 1 , the output interface 307 of the energy storage module 306 is connected to the buffer coil 308 , and the input interface of the energy storage module 306 is connected in parallel with the input interface of the energy storage module 303 , and the power input interface 301 of the voltage change module 302 connected in parallel is used. Connect to the power supply.

The working process of the electromagnetic repulsion operating mechanism is: when the electromagnetic repulsion operating mechanism needs to be divided and closed, the light control thyristor T1 in the energy storage module 303 is controlled to be turned on, and the storage capacitor C1 in the energy storage module passes the electromagnetic The driving coil 305 of the repulsion operating mechanism is discharged to realize the electromagnetic driving of the mechanical switching moving contact; after a certain time, the light control thyristor T2 in the energy storage module 306 is controlled to be turned on, and the storage capacitor C2 in the energy storage module passes the electromagnetic The buffer coil 308 of the repulsive operating mechanism is discharged to realize electromagnetic buffering of the mechanical switch moving contact to avoid strong impact of the moving contact and improve its mechanical life; the storage capacitor C1 or C2 of the energy storage module 303 or the energy storage module 306 After the end of the discharge, the voltage of the storage capacitor C1 or the storage capacitor C2 is zero at this time, and due to the freewheeling action of the current on the drive coil 305 or the buffer coil 308, the storage capacitor C1 or C2 is reversely charged, and the current peak is several. Thousands of times, at the same time, the power supply is positively charged to the storage capacitor C1 or C2 through the voltage conversion module 302, the diode D1 or the diode D2, and the resistor R1 or the resistor R2, but the forward current is small, generally 1 to 2 amps, The result of the superposition of forward charging and reverse charging is that the reverse charging current is much larger than the forward current, and the storage capacitor C1 or C2 is charged by the reverse current, charging a negative voltage, and a higher negative voltage occurs, generally more than several hundred volts. It ensures the reliable shutdown of the light-controlled thyristor T1 or the light-controlled thyristor T2.

After the voltage on the storage capacitor C1 or C2 is reversed, the voltage conversion module 302 automatically charges the capacitors in the energy storage module 303 and the energy storage module 306, and completes the energy storage in a short time, for the next branching and closing operation. ready.

The above-mentioned switch K1 or switch K2 is in an open state during normal operation and is in a closed state during troubleshooting.

The embodiment of the invention can realize electromagnetic driving and electromagnetic buffering of the moving contact when the mechanical switch is divided and closed, and complete automatic energy storage in a short time after the end of the operation, and prepare for the next branching and closing; the method is simple to control It has high degree of automation and strong anti-interference ability. It can realize the electromagnetic repulsion and closing operation of the electromagnetic repulsion mechanism, so that the moving contact can reliably perform electromagnetic driving and electromagnetic buffering, and complete in a short time after the end of one operation. Automatic energy storage. Further, in the opening operation of the present invention, the opening coil is used as the driving coil, and the closing coil is used as the buffer coil. In the closing operation, the closing coil acts as a driving coil, and the opening coil acts as a buffer coil.

The electromagnetic repulsion operating mechanism in the embodiment includes an energy storage device. The structure of the energy storage device is a voltage conversion module 302, and an energy storage module connected thereto. The structure of the energy storage module is the storage in the embodiment. The structure of the energy module 303 includes a storage capacitor, a charging circuit, a discharging circuit, an input interface and an output interface. The charging circuit includes a diode, a resistor and a switch. The cathode of the diode is connected to one end of the resistor, and the other end of the resistor is connected to the light control diode. The switch is connected in parallel at both ends of the storage capacitor; the discharge circuit comprises a light-controlled thyristor, one end of the light-controlled thyristor is connected to the output interface, and the other end is respectively connected with the storage capacitor and the resistor, and the storage capacitor is connected to the input interface through the charging circuit, and the energy storage is performed. The capacitor is connected to the output interface after passing through the discharge circuit. In addition, the voltage conversion module of the energy storage device may be a constant current charger 102. As shown in FIG. 2, the constant current charger is a PWM-controlled full-bridge rectifier circuit, and similarly to FIG. The input interface 101, the energy storage module 103, the energy storage module 105, the output interface 104, and the output interface 106. The voltage conversion module of the energy storage device may also be a step-up transformer 202, as shown in FIG. 3, and similarly to FIG. 1, further comprising: a power input interface 201, an energy storage module 203, an energy storage module 205, and an output. Interface 204 and output interface 206.

An embodiment of an energy storage module of an electromagnetic repulsion operating mechanism of the present invention.

The utility model comprises a storage capacitor, a charging circuit and a discharging circuit, wherein the charging circuit and the discharging circuit are respectively connected at two ends of the storage capacitor, the discharging circuit is composed of a thyristor, one end of the thyristor is connected to the storage capacitor, and the other end is used for connecting the electromagnetic repulsion operation. The drive coil or buffer coil of the mechanism.

The energy storage module of the electromagnetic repulsion operating mechanism of the embodiment is the energy storage module in the embodiment of the electromagnetic repulsion operating mechanism. Since the introduction of the energy storage module is sufficiently clear and complete, no electromagnetic An embodiment of an energy storage module of a repulsive operating mechanism is described.

An embodiment of an energy storage device of an electromagnetic repulsive operating mechanism of the present invention.

The utility model comprises a voltage conversion module and an energy storage module connected thereto, the energy storage module comprises a storage capacitor, a charging circuit and a discharge circuit, wherein the charging circuit and the discharging circuit are respectively connected at two ends of the storage capacitor, and the discharging circuit is composed of a thyristor, the thyristor One end is connected to the storage capacitor, and the other end is used to connect the drive coil or the buffer coil of the electromagnetic repulsive operating mechanism.

The energy storage module in the energy storage device of the electromagnetic repulsion operating mechanism of the embodiment is the energy storage module in the embodiment of the electromagnetic repulsion operating mechanism. Since the introduction of the energy storage module is sufficiently clear and complete, it is not An embodiment of an energy storage device of an electromagnetic repulsion operating mechanism is described.

Industrial applicability

In the embodiment of the invention, after the storage capacitor discharges to zero voltage, the freewheeling action of the excitation coil is used to reversely charge the storage capacitor, generating a negative voltage drop of several hundred volts to ensure reliable shutdown of the light control diode. . Because the control circuit of the embodiment of the invention is simple, high in automation, good in reliability, and has strong anti-interference ability, the electromagnetic repulsion and closing operation of the electromagnetic repulsive mechanism can be realized, and the movable contact can be reliably performed. Electromagnetic drive and electromagnetic buffering, and complete automatic energy storage in a short time after the end of one operation, ready for the next branching and closing.

Claims

An energy storage module of an electromagnetic repulsion operating mechanism includes a storage capacitor, a charging circuit, and a discharging circuit, wherein a charging circuit and a discharging circuit are respectively connected at two ends of the storage capacitor, wherein the discharging circuit is composed of a thyristor, and one end of the thyristor The storage capacitor is connected, and the other end is connected to a driving coil or a buffer coil of the electromagnetic repulsive operating mechanism.
The energy storage module of the electromagnetic repulsion operating mechanism according to claim 1, wherein the thyristor is a light control type thyristor.
The energy storage module of the electromagnetic repulsion operating mechanism according to claim 1, wherein the charging circuit comprises a diode and a resistor, and a cathode of the diode is connected to the storage capacitor through a resistor.
The energy storage module of the electromagnetic repulsion operating mechanism according to claim 3, wherein the charging circuit further comprises a switch, one end of the switch is connected to the diode cathode, and the other end of the switch is connected to the storage capacitor, the switch The resistor and the storage capacitor form an energy dissipation loop.
An energy storage device for an electromagnetic repulsion operating mechanism includes a voltage conversion module and an energy storage module connected thereto, the energy storage module includes a storage capacitor, a charging circuit, and a discharging circuit, wherein the charging circuit and the discharging circuit are respectively connected The discharge circuit is composed of a thyristor, one end of the thyristor is connected to the storage capacitor, and the other end is connected to a driving coil or a buffer coil of the electromagnetic repulsion operating mechanism.
The energy storage device of the electromagnetic repulsion operating mechanism according to claim 5, wherein the thyristor is a light-controlled thyristor.
The energy storage device of an electromagnetic repulsive operating mechanism according to claim 5, wherein the charging circuit comprises a diode and a resistor, and a cathode of the diode is connected to the storage capacitor through a resistor.
The energy storage device of the electromagnetic repulsion operating mechanism according to claim 7, wherein the charging circuit further comprises a switch, one end of the switch is connected to the cathode of the diode, and the switch is further One end of the storage capacitor is connected, and the switch, the resistor and the storage capacitor form an energy dissipation loop.
An electromagnetic repulsion operating mechanism includes a voltage conversion module, an energy storage unit, a driving coil and a buffer coil, wherein the voltage conversion module is connected to an energy storage unit, and the energy storage unit comprises two energy storage modules, and the two energy storage modules Connected to the driving coil and the buffer coil respectively, each group of energy storage modules includes a storage capacitor, a charging circuit, and a discharging circuit, wherein the charging circuit and the discharging circuit are respectively connected at two ends of the storage capacitor; the discharging circuit The thyristor is composed of one end of the thyristor connected to the storage capacitor and the other end connected to the drive coil or the buffer coil.
The electromagnetic repulsive operating mechanism according to claim 9, wherein the thyristor is a light-controlled thyristor.
The electromagnetic repulsion operating mechanism according to claim 9, wherein the drive coil and the snubber coil are coils for closing or opening.
The electromagnetic repulsion operating mechanism according to claim 9, wherein said charging circuit comprises a diode and a resistor, and a cathode of the diode is connected to said storage capacitor by a resistor.
The electromagnetic repulsion operating mechanism according to claim 12, wherein the charging circuit further comprises a switch, one end of the switch is connected to the cathode of the diode, and the other end of the switch is connected to the storage capacitor, the switch, the resistor and The storage capacitor forms an energy dissipation loop.