阅读说明：本技术 具有制动负载保护功能的供电故障快速隔离与保护装置 (Power supply fault rapid isolation and protection device with brake load protection function ) 是由 姜正威 冯亮 赵云辉 颜伟 于 2020-11-26 设计创作，主要内容包括：本发明提供了一种具有制动负载保护功能的供电故障快速隔离与保护装置,负载电阻箱单元的常用耗能电阻与变流器监测单元相连,制动电阻与制动电路保护单元相连；变流器监测单元的整流逆变模块用于监测发电机变流器状态,并根据状态控制机侧断路器和网侧断路器的开启和关闭,机侧断路器和网侧断路器用于控制电路通断；制动电路保护单元的电路接入部件与变流器监测单元连接,根据变流器监测单元,继电器与电路接入部件连接,制动断路器与继电器连接,制动断路器的主回路进线端与发电机,制动断路器的主回路出线端与负载电阻箱单元的制动电阻连接。本发明在变流器故障时拒绝接通供电,并切换至制动电路进行卸载,使安全防护更加完善、可靠。(The invention provides a power supply fault rapid isolation and protection device with a braking load protection function, wherein a common energy consumption resistor of a load resistor box unit is connected with a current transformer monitoring unit, and a braking resistor is connected with a braking circuit protection unit; the rectification inversion module of the converter monitoring unit is used for monitoring the state of the generator converter and controlling the opening and closing of the machine side circuit breaker and the network side circuit breaker according to the state, and the machine side circuit breaker and the network side circuit breaker are used for controlling the on-off of a circuit; the circuit access component of the brake circuit protection unit is connected with the converter monitoring unit, the relay is connected with the circuit access component according to the converter monitoring unit, the brake circuit breaker is connected with the relay, the main circuit inlet end of the brake circuit breaker is connected with the generator, and the main circuit outlet end of the brake circuit breaker is connected with the brake resistor of the load resistor box unit. The invention refuses to switch on the power supply when the converter fails, and switches to the brake circuit for unloading, so that the safety protection is more perfect and reliable.)

1. A power supply fault rapid isolation and protection device with a braking load protection function is characterized by comprising a load resistance box unit, a current transformer monitoring unit and a braking circuit protection unit; wherein:

the load resistance box unit comprises a common energy consumption resistor and a brake resistor; the common energy consumption resistor is connected with the converter monitoring unit, and the brake resistor is connected with the brake circuit protection unit;

the converter monitoring unit comprises a rectification inversion module, a machine side circuit breaker and a network side circuit breaker, wherein the rectification inversion module is used for monitoring the state of the generator converter and controlling the machine side circuit breaker and the network side circuit breaker to be opened and closed according to the state, and the machine side circuit breaker and the network side circuit breaker are used for controlling the on-off of a circuit;

the brake circuit protection unit comprises a brake circuit breaker, a circuit access component, a relay and a switch, wherein the circuit access component is connected with the converter monitoring unit, the relay is connected with the circuit access component according to the converter monitoring unit, the brake circuit breaker is connected with the relay, a main circuit wire inlet end of the brake circuit breaker is connected with the generator, and a main circuit wire outlet end of the brake circuit breaker is connected with a brake resistor of the load resistor box unit.

2. The power supply fault rapid isolation and protection device with brake load protection function as claimed in claim 1, wherein for the condition of high load operation of the generator, when the converter is in fault, the converter monitoring unit controls the machine side breaker and the grid side breaker to be disconnected, and at the moment, the load resistance box unit is cut off from the circuit system; meanwhile, the converter monitoring unit controls the circuit access part to be switched on, so that the intermediate relay is closed, the load resistance box unit is put into the circuit system again, and at the moment, the brake resistor in the load resistance box unit is put into operation to absorb the electric energy of the generator.

3. The power supply fault rapid isolation and protection device with the brake load protection function according to claim 1 or 2, characterized in that the circuit access component adopts an alarm indicator lamp.

4. The power supply fault rapid isolation and protection device with brake load protection function according to claim 1 or 2, characterized in that the brake breaker current is 1250A.

5. The power supply fault rapid isolation and protection device with brake load protection function according to claim 1 or 2, wherein the outer diameter of the cable connected between the main loop inlet end of the brake circuit breaker and the generator is 240mm²。

6. The power supply fault rapid isolation and protection device with the brake load protection function according to claim 1 or 2, wherein the outer diameter of a cable connected between a main loop outlet end of the brake circuit breaker and the brake resistor of the load resistor box unit is 240mm²。

7. An isolation and protection method for a power supply fault rapid isolation and protection device with a brake load protection function according to any one of claims 1 to 6, characterized by comprising the following steps:

monitoring the state of a generator converter in real time by adopting a rectification inversion module of a converter monitoring unit; when the acquired converter state is a converter fault, the converter monitoring unit controls the machine side circuit breaker and the network side circuit breaker to be disconnected, and at the moment, the load resistance box unit is cut off from the circuit system; meanwhile, the converter monitoring unit controls the circuit access part to be switched on, so that the intermediate relay is closed, the load resistance box unit is switched into the circuit system again, and at the moment, the brake resistor in the load resistance box unit is switched into operation to absorb the electric energy of the generator.

8. A permanent magnet synchronous generator set, characterized in that, it comprises a permanent magnet synchronous generator and a power supply fault rapid isolation and protection device with brake load protection function of any claim 1-6 connected with the permanent magnet synchronous generator.

Technical Field

The invention belongs to the technical field of power system automation, and particularly relates to a power supply fault rapid isolation and protection device with a braking load protection function.

Background

The output voltage of the permanent magnet synchronous generator exceeds the rated voltage as long as the rotating speed exceeds the rated rotating speed, and the higher the rotating speed is, the higher the voltage is. In order to prevent the generator and the load from being damaged due to overhigh voltage, the rotating speed of the permanent magnet synchronous generator needs to be controlled, and the flying is prevented by means of faster response speed.

The existing power protector can play a certain role of protecting equipment when an electrified circuit is in fault, but passive mechanical protection is generally adopted, namely after the power protector is required to be connected to electrify a load, a current transformer is used for detecting the current condition in the load or a power line to detect and judge and then drive a power switch to act. However, compared with the prior art, the protector does not have the function of rapid isolation and protection for the line disconnection time of the system, and cannot protect system equipment in time.

The load resistor needs to continuously adjust the actually input power according to a preset power value in the operation process, and also needs to monitor the operation state in real time, so that the load resistor is maintained in time when a fault occurs, and therefore, the real-time operation parameters of the resistor need to be monitored by adopting a measurement and control device. The current measurement and control system of the load resistor controls the loading and unloading of loads at various gears by components such as a relay, a contactor, a button, a switch and the like, and the measurement and control system can only meet some basic test functions.

Disclosure of Invention

The invention provides a power supply fault rapid isolation and protection device with a brake load protection function, a power supply fault rapid isolation and protection method with the brake load protection function and a permanent magnet synchronous generator set based on the power supply fault rapid isolation and protection device with the brake load protection function.

The invention is realized by the following technical scheme.

According to one aspect of the invention, a power supply fault rapid isolation and protection device with a braking load protection function is provided, which comprises a load resistance box unit, a converter monitoring unit and a braking circuit protection unit; wherein:

the load resistance box unit comprises a common energy consumption resistor and a brake resistor; the common energy consumption resistor is connected with the converter monitoring unit, and the brake resistor is connected with the brake circuit protection unit;

the converter monitoring unit comprises a rectification inversion module, a machine side circuit breaker and a network side circuit breaker, wherein the rectification inversion module is used for monitoring the state of the generator converter and controlling the machine side circuit breaker and the network side circuit breaker to be opened and closed according to the state, and the machine side circuit breaker and the network side circuit breaker are used for controlling the on-off of a circuit;

the brake circuit protection unit comprises a brake circuit breaker, a circuit access component, a relay and a switch, wherein the circuit access component is connected with the converter monitoring unit, the relay is connected with the circuit access component according to the converter monitoring unit, the brake circuit breaker is connected with the relay, a main circuit wire inlet end of the brake circuit breaker is connected with the generator, and a main circuit wire outlet end of the brake circuit breaker is connected with a brake resistor of the load resistor box unit.

Preferably, for the condition of high-load operation of the generator, when a converter fails, the converter monitoring unit controls the machine-side circuit breaker and the grid-side circuit breaker to be disconnected, and at the moment, the load resistance box unit is cut off from a circuit system; meanwhile, the converter monitoring unit controls the circuit access part to be switched on, so that the intermediate relay is closed, the load resistance box unit is put into the circuit system again, and at the moment, the brake resistor in the load resistance box unit is put into operation to absorb the electric energy of the generator.

Preferably, the circuit access component adopts an alarm indicator lamp.

Preferably, the brake chopper current is 1250A.

Preferably, the outer diameter of a cable connected between the main circuit wire inlet end of the brake circuit breaker and the generator is 240mm²。

Preferably, the outer diameter of a cable connected between a main loop outlet end of the brake circuit breaker and the brake resistor of the load resistor box unit is 240mm²。

According to another aspect of the present invention, there is provided an isolation and protection method for a power supply fault rapid isolation and protection device with a brake load protection function, including:

monitoring the state of a generator converter in real time by adopting a rectification inversion module of a converter monitoring unit; when the acquired converter state is a converter fault, the converter monitoring unit controls the machine side circuit breaker and the network side circuit breaker to be disconnected, and at the moment, the load resistance box unit is cut off from the circuit system; meanwhile, the converter monitoring unit controls the circuit access part to be switched on, so that the intermediate relay is closed, the load resistance box unit is switched into the circuit system again, and at the moment, the brake resistor in the load resistance box unit is switched into operation to absorb the electric energy of the generator.

According to a third aspect of the invention, a permanent magnet synchronous generator set is provided, which comprises a permanent magnet synchronous generator and a power supply fault rapid isolation and protection device with a braking load protection function, wherein the power supply fault rapid isolation and protection device is connected with the permanent magnet synchronous generator.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:

before the circuit protection unit is powered on, the converter monitoring unit monitors the converter state of the generator, whether the states of overload, over-high rotating speed and the like exist, if the hidden danger exists, the converter monitoring unit outputs corresponding control signals to the microprocessor, the machine side circuit breaker and the network side circuit breaker are disconnected, the brake circuit protection unit is communicated, fault display and alarm can be carried out, and the main switch can be switched on only after the hidden danger is eliminated, so that a more convenient and safer protection device is provided for the generator set.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

fig. 1 is a schematic circuit diagram of a power supply fault rapid isolation and protection device with a braking load protection function in a preferred embodiment of the invention.

Detailed Description

The following examples illustrate the invention in detail: the embodiment is implemented on the premise of the technical scheme of the invention, and a detailed implementation mode and a specific operation process are given. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

An embodiment of the invention provides a power supply fault rapid isolation and protection device with a braking load protection function. The direct reason that the generator is overspeed is that the electric energy of the generator is not safely released, and the power supply fault quick isolation and protection device with the braking load protection function provided by the embodiment can add a braking resistor to the generator to safely release the electric energy of the generator. When the converter is connected to supply power, the state of the generator can be detected, whether the states of overload, over-high rotating speed and the like exist is judged, if yes, the converter refuses to be connected to supply power, and the converter is switched to a braking circuit to unload, so that the safety protection is more perfect and reliable.

Fig. 1 is a schematic circuit diagram of a power supply fault rapid isolation and protection device with a braking load protection function in a preferred embodiment of the invention.

Referring to fig. 1, the present embodiment provides a power supply fault fast isolating and protecting apparatus with a braking load protection function, including: the device comprises a load resistance box unit, a current transformer monitoring unit and a brake circuit protection unit; wherein:

the load resistance box unit comprises a common energy consumption resistor and a brake resistor; the common energy consumption resistor is connected with the converter monitoring unit, and the brake resistor is connected with the brake circuit protection unit;

the converter monitoring unit comprises a rectification inversion module, a machine side circuit breaker and a network side circuit breaker, wherein the rectification inversion module is used for monitoring the state of the generator converter and controlling the machine side circuit breaker and the network side circuit breaker to be opened and closed according to the state, and the machine side circuit breaker and the network side circuit breaker are used for controlling the on-off of a circuit;

the brake circuit protection unit comprises a brake circuit breaker, a circuit access component, a relay and a switch, wherein the circuit access component is connected with the converter monitoring unit, the relay is connected with the circuit access component according to the converter monitoring unit, the brake circuit breaker is connected with the relay, a main circuit wire inlet end of the brake circuit breaker is connected with the generator, and a main circuit wire outlet end of the brake circuit breaker is connected with a brake resistor of the load resistor box unit.

As a preferred embodiment, in the case of high-load operation of the generator, when the converter fails, the converter monitoring unit controls the machine-side circuit breaker and the grid-side circuit breaker to be disconnected, and at this time, the load resistance box unit is cut off from the circuit system; meanwhile, the converter monitoring unit controls the circuit access part to be switched on, so that the intermediate relay is closed, the load resistance box unit is put into the circuit system again, and at the moment, the brake resistor in the load resistance box unit is put into operation to absorb the electric energy of the generator.

As a preferred embodiment, the circuit access component adopts an alarm indicator lamp.

As a preferred embodiment, the brake chopper current is 1250A.

As a preferred embodiment, the outer diameter of a cable connected between the main circuit wire inlet end of the brake circuit breaker and the generator is 240mm²。

As a preferred embodiment, the outer diameter of a cable connected between a main loop outlet end of the brake circuit breaker and the brake resistor of the load resistor box unit is 240mm²。

As shown in fig. 1, in the power supply fault fast isolating and protecting device with a braking load protection function provided in this embodiment, under a system fault condition, the breaker control unit controls each incoming line switch and outgoing line switch to implement fault fast isolating and communicates with a braking load to implement a protection function. The embodiment can realize the quick isolation of the fault line and effectively improve the reliability and stability of power supply.

In the load resistance box unit, a common energy consumption resistor is connected with the converter monitoring unit, and a brake resistor in the load resistance box unit is connected with the brake circuit protection unit; in the brake circuit protection unit, a brake protection circuit contactor KA3 is controlled to be attracted and disconnected through brake circuit converter open circuit alarm output terminals 1 and 2; in the converter monitoring unit, a rectification inversion module is responsible for monitoring the state of a generator, and the circuit breakers on the machine side and the network side control the on-off of a converter monitoring unit circuit.

The converter monitoring module continuously monitors the voltage of the generator, and the converter is in fault shutdown and lights a fault indicator lamp HL1 on the converter cabinet door when the voltage of the generator exceeds a protection value. The coil of the intermediate relay KA1 can be wired from the terminal of the converter fault indicator lamp HL1, and KA3 also attracts when HL1 lights up.

A brake circuit breaker QS3 is controlled to start and stop by KA1, and the brake circuit breaker QS3 is referenced to current 1250A. From generator motor line (reference cable external diameter 240 mm)²) In addition, a group of cables are connected to the main loop inlet end of a brake circuit breaker QS3, and the main loop outlet end of the brake circuit breaker QS3 is connected with a field load box (the outer diameter of the reference cable is 240 mm)²)。

When the generator runs under high load, if a converter fault caused by the fact that the voltage of the generator exceeds a protection value or other reasons occurs, the converter can immediately disconnect a machine side breaker QS2 and a net side breaker QS1 and light a fault indicator lamp, a load box is cut off from the system, QS3 is attracted, the load box is put into operation again, and the function of the load box is changed from normal load to brake resistance at the moment. The whole process of changing from the load box to the braking resistor can be completed within 1 second, and then the braking resistor absorbs the electric energy of the generator. When the converter fails, the load resistance is large, the brake resistance is large, and manual intervention is not needed. Therefore, the electric energy of the generator can be continuously and effectively and safely released, the expander control system also receives the fault signal of the converter to enter a shutdown state, and the rotating speed of the generator cannot be continuously increased so as to fly.

When the generator stops, the converter is reset manually, the converter fault indicator lamp HL1 is turned off, the brake resistor is withdrawn, and the restarting is not influenced.

No matter whether the generator is operated or not, the brake resistor can be put into use as long as the converter fails, and the generator can be started only by eliminating the fault of the converter.

Another embodiment of the present invention provides an isolation and protection method for a power supply fault rapid isolation and protection device with a braking load protection function, provided in any one of the above embodiments, including:

monitoring the state of a generator converter in real time by adopting a rectification inversion module of a converter monitoring unit; when the acquired converter state is a converter fault, the converter monitoring unit controls the machine side circuit breaker and the network side circuit breaker to be disconnected, and at the moment, the load resistance box unit is cut off from the circuit system; meanwhile, the converter monitoring unit controls the circuit access part to be switched on, so that the intermediate relay is closed, the load resistance box unit is switched into the circuit system again, and at the moment, the brake resistor in the load resistance box unit is switched into operation to absorb the electric energy of the generator.

The third embodiment of the invention provides a permanent magnet synchronous generator set, which comprises a permanent magnet synchronous generator and a power supply fault rapid isolation and protection device which is connected with the permanent magnet synchronous generator and has a braking load protection function.

The output voltage of the permanent magnet synchronous generator exceeds the rated voltage as long as the rotating speed exceeds the rated rotating speed, and the higher the rotating speed is, the higher the voltage is. In order to prevent the generator and the load from being damaged due to high voltage, the rotating speed of the permanent magnet synchronous generator needs to be controlled. The direct reason for the overspeed of the generator is that the electric energy of the generator is not safely released, and the power supply fault rapid isolation and protection device and the method with the braking load protection function, which are provided by the embodiment of the invention, can add a braking resistor to the generator to safely release the electric energy of the generator. When the converter monitoring unit is connected to supply power, the converter state of the generator can be detected, whether the generator has states of overload, over-high rotating speed and the like is judged, if yes, the converter refuses to be connected to supply power, and the converter is switched to a braking circuit to unload, so that the safety protection is more perfect and reliable.

It should be noted that, the steps in the method provided by the present invention can be implemented by using corresponding modules, devices, units, and the like in the system, and those skilled in the art can implement the step flow of the method by referring to the technical scheme of the system, that is, the embodiment in the system can be understood as a preferred example of the implementation method, and details are not described herein.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.