一种考虑三相故障相角跳变补偿的后续换相失败抑制方法  

A Control Method for Subsequent Commutation Failure Considering Phase Jump Compensation Under Three-phase-to-ground Fault

作　　者：徐志 李胜男 郭成 邢超 XU Zhi;LI Shengnan;GUO Cheng;XING Chao(Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming,Yunnan 650217,China)

机构地区：[1]云南电网有限责任公司电力科学研究院,云南昆明650217

出　　处：《广东电力》2021年第7期50-59,共10页Guangdong Electric Power

基　　金：国家重点研发计划项目(2016YFB0900201);云南电网有限责任公司重点科技项目(YNKJXM20191362)。

摘　　要：为了降低高压直流(high voltage direct current,HVDC)输电系统后续换相失败的发生概率,提出一种考虑三相故障相角跳变补偿的后续换相失败抑制方法。首先通过理论推导分析相角跳变的产生机理,然后在此基础上分析其对后续换相失败的影响;接着通过对比首次换相失败与第二次换相失败过程中各电气量的波形图,得到相角跳变是引发后续换相失败的重要原因,并基于换相电压时间面积法则,依据故障的严重程度增加故障期间的越前触发角的增量,进而抑制后续换相失败;最后基于CIGRE标准模型,在PSCAD/EMTDC中实现所提控制方法。仿真结果表明,所提方法可有效地抑制HVDC输电系统的后续换相失败,从而改善其故障恢复特性。To reduce the probability of subsequent commutation failure in the high voltage direct current(HVDC)system,this paper proposes a control method for the subsequent commutation failure considering phase jump compensation under the three-phase-to-ground fault.It firstly analyzes the mechanism of phase jump and the impact of phase jump on commutation failure.By comparing the waveforms of electrical quantities in the the first and the second commutation failure process,it is found that phase jump is an important reason causing subsequent commutation failure.Based on the volt-time area required for the commutation and the impact of phase jump on commutation failure,the advance trigger angle is increased to control the subsequent commutation failure.Finally,based on the CIGRE benchmark model of HVDC,the proposed control method is realized in PSCAD/EMTDC.The simulation results show that the method proposed can mitigate the subsequent commutation failure to some extent and improve the fault recovery performances.

关 键 词：后续换相失败 换相失败抑制 相角跳变 高压直流输电 

分 类 号：TM721.1[电气工程—电力系统及自动化]