含分布式电源配电网故障的Petri网诊断方法

A Petri Net Diagnosis Method for Faults of the Distribution Network with Distributed Generation

现有含DG配电网的Petri网故障诊断方法需要多次假定正方向,造成故障诊断过程复杂、计算量大。通过分析故障后功率方向和初始托肯赋值的特点,提出一种基于功率方向的初始托肯判据,并基于该判据只需要假定一次正方向和一次定位,就能定位出故障区段;同时对FTU遥信数据和遥测数据设置不同置信度,使得区段定位的容错能力得到了提高。通过配电网算例分析,验证了所提方法在含DG配电网故障诊断中的优势。

The existing Petri nets faults diagnosis method for the distribution network with DG needs to assume the positive direction for many times,resulting in a complex fault diagnosis process and large amount of calculation.To this end,on the basis of analyzing the characteristics of power direction and initial token assignment after the fault occurs,this paper proposes an initial Token criterion based on power direction.Based on this criterion,only one assumed positive direction and one positioning are needed for locating the fault section.In addition,different confidence levels are set for FTU telecommunicating data and telemetering data to improve the fault tolerance of section positioning.The advantages of the proposed method in fault diagnosis for the distribution network with DG are verified by an example of distribution network.