摘要
为了提高电网故障诊断结果的准确性,提出了基于改进Petri网与希尔伯特黄变换融合的电网故障诊断方法。首先在已有基于开关量的Petri网模型上做了简化与改进,改进模型同时考虑了主保护、后备保护和失灵保护的影响,可充分模拟实际故障中各个保护的优先级别,并引入分步诊断的概念简化了模型推导的复杂程度;然后通过希尔伯特黄变换来分析已获取的可疑故障设备的相关电气量,同时定义并计算得幅值故障度、频率故障度和能量故障度三个故障测度指标;最后在D-S证据理论的基础上融合三个故障测度获取故障元件。算例结果表明,该方法可改善故障诊断的准确度。
In order to improve the accuracy of power grid fault diagnosis,a comprehensive fault diagnosis method was proposed based on improved Petri net and HHT.First,considering the influence of the main protection,the backup protection and the failure protection,the Petri net model based the switching signal was improved to fully simulates the priority of each protection in the actual fault.And then,by the introduction of the concept of step-by-step diagnosis,the complexity of the model derivation was simplified.After getting of the suspicious fault equipment set,the Hilbert-Huang transform was used to analyze the electric signal of the suspicious equipment.At the same time,the indices of fault diagnosis（the amplitude fault degree,the frequency fault degree,and the energy fault degree）were calculated.Finally,the diagnosis components were obtained by the D-S evidence theory.Example results show that the proposed method can improve the diagnostic accuracy of power grid faults.
出处
《水电能源科学》
北大核心
2018年第3期210-214,共5页
Water Resources and Power
基金
国家自然科学基金项目(51607112)
