一种融合电气量和开关量的电网Petri网故障诊断方法
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1.西华大学电气与电子信息学院;2.西华大学 电气与电子信息学院

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国家自然科学基金项目(61703345);四川省信号与信息处理重点实验室项目(SZJJ2017-049)


A fault diagnosis method of power grid based on Petri net fusion the analogue information and the digital information
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School of Electrical Engineering and Electronic Information, Xihua University

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    摘要:

    对故障元件进行快速、准确地诊断,是实现电网在线调控运行的重要前提之一。基于Petri网的电网故障诊断方法因其建模清晰、逻辑缜密,得到了研究人员的广泛关注。但目前的方法大多针对开关量分析,对电气量的关注度相对较少,而电气量在准确性、容错性等方面比开关量都更具优势。基于此,提出了一种计及电气量和开关量的电网Petri网故障诊断方法。首先利用希尔伯特-黄变换对元件的故障电流进行特征提取,通过模糊逻辑分析和模糊逻辑Petri网推理得到元件的故障概率表征;其次针对开关量进行分析,建立元件的Petri网模型,对故障时序信息进行约束检查和挖掘分析,经模糊推理计算得到故障概率表征。最后利用D-S证据理论对故障概率表征进行决策层融合,得到元件最终的故障概率。通过对新英格兰10机39节点系统的多组故障案例进行诊断测试,结果表明该方法能快速诊断故障元件,改善了基于单一故障源和单一诊断方法的局限性,能有效提高故障诊断的准确性和容错性。

    Abstract:

    Fast and accurate diagnosis of fault components is one of the important preconditions to realize on-line regulation and operation of power grid. Because of its clear modeling and careful logic, the fault diagnosis method of power grid based on Petri net has been widely concerned by many researchers. However, most of the current methods consider the digital information, and pay less attention to the analogue information, and the analogue information has more advantages than the digital information in accuracy, fault tolerance and so on. Based on this, a fault diagnosis method of power grid based on Petri net considering the analogue one and the digital part is proposed. Firstly, the fault current of the components is extracted by Hilbert-Huang transform, and the fault probability of the components is obtained through fuzzy logic analysis and fuzzy logic Petri net reasoning. Secondly, based on the analysis of the digital information, the Petri net model of the components is established, and the constraint check and mining analysis of the fault sequence information are carried out, and the fault probability is obtained by fuzzy reasoning calculation. Finally, D-S evidence theory is used to fuse the fault probability level to obtain the final failure probability of components. Several fault cases of the New England 10 machine 39 bus system are tested. The results show that the method can quickly diagnose fault components, improve the limitations of single fault source and single diagnosis method, and effectively improve the accuracy and fault tolerance of fault diagnosis.

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  • 收稿日期:2020-09-03
  • 最后修改日期:2020-11-05
  • 录用日期:2020-11-23
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