基于LC电源的混合式高压直流断路器分断试验方法

Current-Breaking Test Method Based on LC Source for Hybrid HVDC Circuit Breaker

直流断路器分断试验为运行试验中最为核心的部分,其有效性直接关乎直流断路器电气性能的验证。该文针对柔性直流电网用混合式高压直流断路器分断试验展开研究,目的在于提出具有工程可行性的分断试验方法和试验参数。首先,在对混合式高压直流断路器原理和工况分析的基础上,揭示了混合式高压直流断路器整机应力特性;然后,在应力提取的基础上,提出了LC电源试验电路以及参数;最后,通过200 k V断路器整机短路电流分断试验验证了试验电路和试验方法的准确性。实验结果可为混合式高压直流断路器试验系统设计提供参考。

Current-breaking test is the core part of the operation tests for DC circuit breaker, whose effectiveness is directly related to the verification of the electrical performance of DC circuit breakers. This paper studies the current-breaking test method of hybrid HVDC circuit breaker for MMC-HVDC system, aiming to present the current-breaking test method and test parameters for engineering feasibility. Firstly, based on the analysis of the principle and working condition of hybrid HVDC circuit breaker, we reveal the its stress characteristics; then, on the basis of stress extraction, we present the LC source test circuit and parameters; finally, we verify the accuracy of the simulation circuit and test method through the short-circuit current-breaking test for a 200 kV circuit breaker, whose results can provide reference for the current-breaking test design of hybrid HVDC circuit breaker.