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基于最大似然译码字的Petri网电网故障诊断方法

, PP. 46-52

Keywords: 信号畸变,最大似然译码,Petri网,故障诊断

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Abstract:

考虑到畸变的动作信号对电网故障诊断准确度的影响,提出一种基于最大似然译码字的Petri网故障诊断方法。首先,根据保护和断路器的动作逻辑关系,建立故障元件的Petri网诊断模型,并运用CPNTools软件验证其合理性;其次,推导相关矩阵,并给出确定监督码元数量的方法;最后,应用最大似然可信度和相关代价之间的关系确定最佳错误图样,以此对畸变信号进行纠正,并根据故障映射关系做出相应的故障诊断。算例分析和不同模型诊断结果的对比表明上述方法可提高故障诊断结果的容错性和准确性。

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