Isolation control method and system for fault of extra-high voltage converter station, and medium

Abstract

The invention discloses an isolation control method and system for a fault of an extra-high voltage converter station, and a medium. The method comprises the following steps of: judging the type of a current differential protection action triggered by a fault occurring in a pole region of the extra-high voltage converter station; judging whether a direct current side wiring mode of a converter region of the pole region where the fault is located is a fast circuit breaker wiring mode or not, wherein the fast circuit breaker wiring mode is implemented by the steps of sequentially connecting a cathode circuit breaker and a parallel circuit breaker in series between a cathode disconnecting link and a bypass disconnecting link for a converter region, and connecting an anode circuit breaker in series between a bypass disconnecting link and an anode disconnecting link; and according to the type of the current differential protection action of the pole region where the fault is located and the direct current side wiring mode of the converter region of the pole region where the fault is located, determining the isolation control method for the fault of the extra-high voltage converter station. According to the isolation control method and system, accurate identification and rapid isolation of the fault current converter and rapid restart and continuous live-line operation of the sound current converter are realized, and the safety and reliability of the overall operation of the extra-high voltage direct current are improved.

Description

technical field [0001] The invention relates to the technical field of fault isolation control of UHV converter stations, in particular to a method, medium and system for fault isolation control of UHV converter stations. Background technique [0002] Each pole of the UHV converter station is composed of two series-connected converters. In the operation mode of bipolar four-converter or bipolar three-converter or unipolar double-converter, such as figure 1 As shown, the failure of a single converter will cause the differential protection of the converter to operate. Since the cathode knife switch and anode knife switch of the converter do not have the ability to quickly extinguish the arc and break the fault current, pole blocking and pole isolation are required. Operation, high jump, low-side converter incoming circuit breaker, to isolate the fault point. In addition, if figure 1 As shown, after the pole differential protection in the prior art is activated, pole blocking...

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Problems solved by technology

[0003] Embodiments of the present invention provide an isolation control method, medium and system for UHV converter station faults, so as to solve the problem of single-pole outage and excessive power loss caused by the isolation control strategy of UHV converter station faults in the prior art The problem

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