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基于证据理论融合的广域后备保护新方法

, PP. 246-255

Keywords: 广域后备保护,电流故障分布特性,电流故障分量群体比幅,D-S证据理论

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Abstract:

为降低广域后备保护(WABP)通信流量,提高信息出错或丢失情况下保护决策的正确性,提出一种基于证据理论融合的WABP新算法。该算法在电网发生故障后,各子站首先根据启动元件动作情况和本站故障电流的分布特性,向主站上传站内少量线路的电流信息。然后,主站通过群体比幅识别候选疑似故障线路,并向相关子站索取故障疑似线路的保护信息域内的传统保护动作信息,采用改进的证据理论方法对相关信息进行融合判断,进而识别实际故障线路。仿真实例表明,该WABP算法具有采样同步要求低、广域通信流量小、在局部信息错误或丢失时仍能正确决策等良好性能。

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