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换流站桥差保护误动机理及基于互近似熵的闭锁新方案
翁汉琍1, 贾永波1, 刘雷2, 黄景光1, 李振兴1, 林湘宁3
1.三峡大学 梯级水电站运行与控制湖北省重点实验室,湖北 宜昌 443002;2.国网湖北省电力公司检修公司鄂中运维分部,湖北 武汉 430050;3.华中科技大学 强电磁工程与新技术国家重点实验室,湖北 武汉 430074
摘要:
针对高压直流输电工程在运行过程中多次发生换流站桥差保护误动的情况,对换流站桥差保护误动机理开展研究。利用PSCAD/EMTDC搭建特高压直流输电仿真模型,对空载合闸和外部故障切除情况下桥差保护误动行为进行仿真分析,揭示其误动原因,并提出一种基于互近似熵算法的桥差保护防误动闭锁新方案,以防止因电流互感器(TA)传变异常引起的桥差保护误动作。仿真结果表明所提闭锁方案在励磁涌流和恢复性涌流情况下能够有效防止桥差保护误动作。
关键词:  高压直流输电  桥差保护  换流站  TA饱和  互近似熵  防误动闭锁判据
DOI:10.16081/j.epae.201909006
分类号:TM77
基金项目:国家自然科学基金资助项目(51607106);梯级水电站运行与控制湖北省重点实验室(三峡大学)开放基金资助项目(2018KJX05)
Mal-operation mechanism and novel cross-approximate entropy based blocking scheme of bridge differential protection in converter stations
WENG Hanli1, JIA Yongbo1, LIU Lei2, HUANG Jingguang1, LI Zhenxing1, LIN Xiangning3
1.Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station, China Three Gorges University, Yichang 443002, China;2.Central Hubei Division of State Grid Hubei Corporation Maintenance Company, Wuhan 430050, China;3.China State Key Laboratory of Electromagnetic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract:
Aiming at the situation that multiple mal-operation events of bridge differential protection in converter stations occurred during the operation process of HVDC transmission projects, the mal-operation mecha-nism is researched. The UHVDC transmission simulation model is built in PSCAD/EMTDC, the mal-operation behaviors of bridge differential protection in the cases of no-load closing and external fault removal are simulated and analyzed to reveal themal-operation reasons, and a novel blocking scheme for preventing mal-operation of bridge differential protection based on cross-approximate entropy algorithm is proposed, which can prevent mal-operation of bridge differential protection caused by CT transformation abnormality. The simulative results show that the proposed scheme can effectively prevent mal-operation of bridge diffe-rential protection in the cases of magnetizing and recovery inrush current.
Key words:  HVDC power transmission  bridge differential protection  converter stations  CT saturation  cross-approximate entropy  blocking criterion for preventing mal-operation

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