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
翁汉琍(1980 —),女,湖北宜昌人,副教授,高级工程师,博士,主要研究方向为电力系统分析、继电保护与控制(E-mail:honey_weng@163.com);
贾永波(1994 —),男,河南信阳人,硕士研究生,主要研究方向为电力系统分析、继电保护与控制(E-mail:282595271@qq.com)。
收稿:2019-04-15,
修回:2019-07-11,
纸质出版:2019-09-10
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翁汉琍,贾永波,刘雷等.换流站桥差保护误动机理及基于互近似熵的闭锁新方案[J].电力自动化设备,2019,39(09):88-94.
WENG Hanli,JIA Yongbo,LIU Lei,et al.Mal-operation mechanism and novel cross-approximate entropy based blocking scheme of bridge differential protection in converter stations[J].Electric Power Automation Equipment,2019,39(09):88-94.
翁汉琍,贾永波,刘雷等.换流站桥差保护误动机理及基于互近似熵的闭锁新方案[J].电力自动化设备,2019,39(09):88-94. DOI: 10.16081/j.epae.201909006.
WENG Hanli,JIA Yongbo,LIU Lei,et al.Mal-operation mechanism and novel cross-approximate entropy based blocking scheme of bridge differential protection in converter stations[J].Electric Power Automation Equipment,2019,39(09):88-94. DOI: 10.16081/j.epae.201909006.
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。
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 the mal-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.
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