A fault feature matching-based fault location for distribution network with DGs

The precise fault location is still an unsolved problem in distribution networks. The application of distributed generation (DG) increases the difficulty of fault location. The fault location in distribution network with DG has been becoming a hot and difficult subject. This paper proposes an impedance-based fault location method for distribution network with DG. First, the impedance models are built. The fault characteristics of the distribution network with DG are analyzed and extracted based on the impedance model. Then the fault section location technology is realized by using the impedance model and the fault characteristics. At last, the differential evolution algorithm is used to precisely locate fault in distribution network with DG. In the algorithm, the variables are the fault distance and the grounded resistance, and the fitness function is the value of the fault characteristic. The differential evolution algorithm can quickly search the precise fault location. The simulation results show that the impedance model of the system, the fault section location method and the fault location method are all effective.