Smart substation GOOSE, SV, MMS three-in-one network achieves full information sharing, the double star network reliability is high, the corresponding power device needs to support efficient and robust redundancy discarding algorithm. According to the PRP recommended double window drop algorithm is complex, disordered packet has low efficiency, timing considerations are not rigorous, restarting exception handling is not included, this paper summarizes the basic needs of discard algorithm, analyzes reliable discarded and safe receiving timing principle, proposes the sequence number state HASH algorithm and a single fixed sliding window method. A detailed analysis of the starting and ending points are or not in the sliding window, the receiving sequence number before or in or after the window situations, and gives the algorithm pseudo code for reference use. Robustness that exceeds specific interval, for the same sequence number, the content of the packet may not be the same;within specific interval, different packets may have the same FCS (frame check sequence). This method can assert and discard received duplicate packet quickly and accurately, which lays a solid basis for the power device of smart substation to realize PRP/HSR algorithm.%智能变电站 GOOSE、SV、MMS三网合一信息充分共享，双星型网架可靠性较高，相应电力装置需支持高效、健壮冗余丢弃算法。针对PRP推荐双窗口丢弃算法较复杂、乱序报文效率较低、时序考量不严谨、无设备重启等异常处理，总结了丢弃算法基本要求，分析了时序可靠丢弃、安全接收原则，提出基于节点对节点链路序列号状态HASH算法和固定单滑动窗口相结合的方法。详细分析起止点在与不在滑动窗口、接收序列号在窗口前中后情形，并给出算法伪码供借鉴使用。健壮性指出超过一定时限，序列号相同，报文内容未必相同；在同一个时限内，FCS(帧校验序列)完全一样，报文内容未必相同。本方法能快速准确判断丢弃接收重复报文，为智能变电站电力装置支持PRP/HSR奠定坚实算法基础。
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