广域继电保护故障区域的自适应识别方法

An Adaptive Identification Method of Fault Region for Wide Area Protection

以降低广域保护范围的系统通信量为目的,提出了广域继电保护的故障区域自适应识别原则及实现方法。结合电力系统故障时序电压的分布特点,讨论了序电压分布受短线路、复故障和高阻接地等因素的影响。同时,实时监视电网广域范围内各母线的序电压,并进行排序计算,由专家系统根据排序结果进行疑似故障区域的分析,实现自适应识别故障区域。故障元件识别算法仅与故障区域内的智能电子设备通信,大幅降低了网络通信量。区别于以往广域继电保护的固定分区方法,系统通过监视故障启动母线的序电压识别故障区域,不受电网结构变化的影响,更易获得电网灵敏度较高的故障信息。仿真实验验证了该方法的有效性。

In order to reduce communication traffic of wide area protection（WAP）,adaptive identification rule and its realization method for WAP are proposed.The effects of short line circuit,complex faults and high resistance grounding on sequence voltage distribution are discussed,combining sequence voltage distribution characteristics when fault occurs.Various bus sequence voltages in the wide power grid area are real-time monitored and ranking calculated by expert system,and fault region is analyzed on the basis of ranking results so as to realize the adaptive identification fault region.Communication traffic is dramatically reduced when system only communicates with intelligent electronic devices（IEDs） in the fault region.Different from the past WAP fixed partition,the method of adaptive identification of fault region for WAP is easier to get high sensitivity fault signal by monitoring the sequence voltage identification fault region of startup buses,meanwhile,the method is immune to structure change of power system.The simulation experiment verifies the validity of this method.