故障诊断信息缺失情况下的电网故障诊断系统

A Grid Fault Diagnosis System in Deficiency of Diagnosis Information

针对电网故障诊断过程中常常出现元件信息传递漏报,导致故障诊断错误甚至无法诊断的问题,提出了基于信息漏报元件的后备信息来对该信息漏报元件的当前状态重新赋值的方法,实现对信息缺失元件的状态值的重新赋值。采用故障诊断优化模型,使得诊断系统能够在完整正确的数据支持下得到正确的诊断结果。经实际例证表明,在引入对缺失信息的修正方法后,因信息缺失而导致的无法对故障实现诊断或者误诊的问题得到了比较好的解决,诊断结果比较合理和准确。

In fault diagnosis optimization model in power system, the state of the electrical components is represented, thus the goal of expressing diagnosing problem as an integer pro- gramming problem which is figuring objective function＇s extremum is achieved. Then grid faults with rigorous mathematical operations are diagnosed. After studying original fault di- agnose model and based on the actual operating conditions, in actual operations, the compo- nent＇s information appeared underreporting, which directly led to the deficiency of diagnosis information, and the old diagnostic model does not conduct in-depth study of that case. Lac- king of diagnose information will lead to diagnostic error or the diagnosis model even can not work out any conclusions. In this case, a way of re-assigning the state of component whose information is missed is intended, and that is based on the component＇s back-up in- formation. As the state of component is re-assignmented, the diagnostic information is being completed and corrected, then the diagnosis system can figure out conclusion fast with the complete information. The practical examples show that within this method of correcting the missing information, the diagnose result is accurate and reasonable.