Wide-area centralized fault section location using grey correlation analysis
Li Shengjian1, Zhao Jianwen2, Ma Nanbing2, Shi Xin2, Guo Liang1
1. State Grid Jiangxi Electric Power Research Institute, Nanchang 330000; 2. Xi’an University of Science and Technology, School of Electrical and Control Engineering, Xi’an 710054;
Abstract：When a single-phase ground fault occurs in a small-current grounding system, the transient zero-sequence current of the healthy section is similar to each other, and the transient zero-sequence current on both sides of the fault point is low in similarity and the waveform difference is large. Based on this feature, a wide-area centralized fault segment location method based on grey correlation analysis is proposed. The method utilizes the centralized structure constructed by the wide-area measurement system to solve the synchronous acquisition problem of the transient zero-sequence current signal, and from the perspective of reducing the communication volume of the system and the calculation amount of the centralized decision center, collect fault information only for each segment of the faulty line. The gray correlation analysis is used to obtain the absolute correlation degree between adjacent detection points, and the degree of difference between the fault section and the non-fault section is described according to the degree of correlation degree. Determining a section with a lowest correlation degree as a fault section. The simulation results show that the positioning result of this method is accurate and reliable, and is not affected by the fault angle, grounding resistance and fault location.
2019, Vol. 20 
