【作者】 张华； 郑涛； 肖仕武； 刘万顺； 黄少锋； 杨青；

【Author】 ZHANG Hua LIU Wanshun ZHENG Tao YANG Qing(Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education (North China Electric Power University),Changping District,Beijing 102206,China)

【机构】 电力系统保护与动态安全监控教育部重点实验室(华北电力大学)；

【摘要】 为了提高距离保护振荡闭锁模块中故障再启动元件的动作性能。本文提出了一种基于形态学分析综合矢量的振荡中故障再识别方案。在系统正常运行状态,其综合矢量是一条沿波形包络线变化的平滑曲线,而在故障时,暂态故障量的存在使得该时刻综合矢量发生跳跃畸变,借助特殊形态学算子就能很好的识别振荡中的故障。仿真实验表明:综合矢量经MMG顺序算子处理后得到MMG系数,在故障时刻其会达到一具有相当幅值的暂态信号,可以可靠、灵敏,快速的识别故障,不受系统频率偏移的影响。更多还原

【Abstract】 In extrahigh voltage system,oscillation and fault should be distinguished in order that the lockout device of distance protection can open the protecion if fault occurs in the oscillation.The paper presents a method based on the tendacy of envelope to distinguish fault.Comprehensive envelope and three phase dummy envelopes based on instantaneous currents of three phases fit for three and single lockout devices separately.The apperance of transient fault value makes the envelope deform,which is strikingly different from the smooth envelope in oscillation.Due to the help of special morpholoty operator,fault can be distinguished accurately.Simulation and experiment indicate that the MMG coefficients gained form three phase simultaneous envelopes processed by MMG progressive operators can form a transient signal with great amplitude,which can distinguish the fault reliably,sensively and repidly.更多还原