A Self-commutated HVDC Circuit Breaker Based on Forced Zero Crossing Technology

doi:10.11930/j.issn.1004-9649.202003090

Abstract

Abstract: In order to improve the breaking capacity of Hybrid DC circuit breaker and reduce the harm of DC short circuit fault to the system, we proposed a self-commutated HVDC circuit breaker based on forced zero crossing technology. The circuit breaker replaces the IGBT components with thyristors and diodes, and realizes the cut-off of the faults on both sides of the circuit breaker through a single precharge capacitor and forced zero crossing technology, which reduces the installation cost of the circuit breaker. In this paper, the topological structure and working principle of the DC circuit breaker are described in detail, and the parameter selection method of the components is analyzed through the action sequence and the equivalent circuit. Finally, the three-terminal ring network model is built by PSCAD simulation software and verified by simulation. The results show that the scheme can realize the reliable cut-off of the fault line, and the circuit breaker can recover the cut-off ability without recharging after one precharge, thus having good economy.

Key words: hybrid DC circuit breaker, precharge capacitor, thyristor, forced zero crossing technology, self-commutated

LI Guoqing, WEI Pengcheng, LIU Yutong, BIAN Jing. A Self-commutated HVDC Circuit Breaker Based on Forced Zero Crossing Technology[J]. Electric Power, 2021, 54(1): 2-9,77.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202003090

https://www.electricpower.com.cn/EN/Y2021/V54/I1/2

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