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直流输电系统换流站保护适应性分析及优化方案研究
张海强, 戴文睿, 牟大林, 刘磊, 林圣, 何正友
西南交通大学 电气工程学院,四川 成都 611756
摘要:
为防止直流输电系统换流站保护在区外故障下误动作,分析换流站保护的适应性,并提出不影响保护速动性与灵敏性的逆变站保护优化方案。利用最小电压前行波与电压反行波幅值积分比值构造逆变站区内外故障的识别判据,进而考虑逆变站保护与区外交流系统保护在时间上的协调配合,设计逆变站保护在区外故障下的防误动策略。基于PSCAD/EMTDC的仿真结果表明,所提保护优化方案不受故障位置、故障类型、故障初始角、过渡电阻以及噪声干扰的影响。
关键词:  高压直流输电  换流站保护误动  故障识别  保护优化
DOI:10.16081/j.epae.201909022
分类号:TM77
基金项目:国家重点研发计划项目(2016YFB0900600);国家自然科学基金资助项目(51977183);国家电网公司科技项目(52094017000W)
Adaptability analysis and optimization scheme for HVDC converter station protection
ZHANG Haiqiang, DAI Wenrui, MOU Dalin, LIU Lei, LIN Sheng, HE Zhengyou
School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
Abstract:
In order to prevent malfunction of HVDC converter station protection under out-zone faults, the adaptability of converter station protection is analyzed, and an optimization scheme of protection without affecting its speed and sensitivity is proposed. The minimum amplitude integration ratio of voltage forward and backward traveling wave is used to construct the identification criterion of in-and out-zone faults of inverter station, and an anti-malfunction strategy of inverter station protection under out-zone faults is designed considering the temporal coordination of inverter station protection and out-zone AC system protection. The simulative results based on PSCAD/EMTDC show that the proposed scheme is not affected by fault location, fault type, initial fault angle, transition resistance and noise.
Key words:  HVDC power transmission  converter station protection malfunction  fault identification  protection optimization

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