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Master-slave synergic control method and control system of DC circuit breaker

A DC circuit breaker and coordinated control technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as long fault response time and inability to disconnect in time, and achieve fast fault response speed, accurate judgment, and expansion of prevention. Effect

Active Publication Date: 2018-01-09
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem in the prior art that the DC circuit breaker mainly receives the detection signal from the system to complete the disconnection, resulting in a long fault response time and cannot be disconnected in time, the present invention provides a DC circuit breaker master-slave cooperative control method and control system

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  • Master-slave synergic control method and control system of DC circuit breaker
  • Master-slave synergic control method and control system of DC circuit breaker
  • Master-slave synergic control method and control system of DC circuit breaker

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Embodiment Construction

[0058] In order to better understand the present invention, the content of the present invention will be further described below in conjunction with the accompanying drawings and examples.

[0059] The invention proposes a master-slave cooperative control method and a control system scheme of a direct current circuit breaker, which are used to control breaking fault currents of the direct current circuit breaker under different working conditions. Such as figure 1 Shown:

[0060]When a fault occurs and the slave control signal sends a breaking signal, turn off the mechanical branch switch and record the fault occurrence time;

[0061] When the time from the fault occurrence is less than the time threshold and the current is detected to be zero, the mechanical switch is broken;

[0062] When the time from the occurrence of the fault is not less than the time threshold and it is detected that the mechanical switch breaks and reaches the withstand voltage, it receives the main ...

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Abstract

The invention provides a master-slave synergic control method and control system of a DC circuit breaker. The method comprises the steps of switching off a mechanical branch switch and recording faultgeneration time when a fault occurs and a breaking signal is given out from a slave control signal; breaking the mechanical switch when the fault generation time is smaller than a time threshold anda current is detected to be 0; and receiving a master control signal when the fault generation time is not smaller than the time threshold and that the mechanical switch is switched off to reach voltage resistance is detected, and judging whether a main branch switch of the DC circuit breaker is switched off or not according to the received master control signal, wherein the master control signalis a system detection signal, and the slave control signal is a changing signal of a DC voltage value in the DC circuit breaker. With the technical scheme provided by the invention, the system fault is judged by combining the accuracy of the system detection signal and the rapidness of slave control in the DC circuit breaker, rapid response speed and accurate judgment are achieved, and misoperation of the DC circuit breaker can be effectively prevented.

Description

technical field [0001] The invention relates to the control field of a DC circuit breaker, in particular to a master-slave coordinated control method and a control system for a DC circuit breaker. Background technique [0002] DC circuit breaker is one of the key equipment in DC transmission system, which can be divided into three types at present: mechanical DC circuit breaker, all solid-state DC circuit breaker and hybrid DC circuit breaker. Among them, the hybrid DC circuit breaker combines mechanical switches and solid-state power electronic devices, which combines the advantages of the former two, and has a good research prospect. However, due to the rapid development of DC side faults, the difficulty of quickly shutting down DC fault currents is still one of the main problems faced by hybrid DC circuit breakers, and it is also the focus of current research. [0003] In the prior art, a cascaded full-bridge DC circuit breaker based on the series connection of full-brid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 林畅刘栋吴学光庞辉常彬闫鹤鸣高路
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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