Fault location method of Distributed Generation Sources in Distribution Networks based on optimal configuration of voltage sag monitoring points

Abstract

In order to evaluate the fault location performance under the optimal configuration scheme of Power Quality Monitoring System(PQMS) monitoring points with Distributed Generation(DG) in, a fault location method based on successive binary search was proposed. Firstly, the influence of DG on traditional optimal configuration is analyzed, and the optimal configuration improvement strategy for DG access is proposed. The function relation between node voltage and fault distance under DG access is analyzed, and the ratio variation relation caused by voltage variation between monitoring points is used to reflect the characteristics of slight variation of electrical quantity, and the ranging evaluation function is established. In order to avoid the setting of convergence threshold, the disadvantage of setting fixed threshold is eliminated. Based on the mean ranging error, several feasible monitoring point configuration schemes are evaluated for ranging performance and the optimal configuration scheme for fault location performance is obtained. The 4-node system verifies that the ranging method does not need to set fixed convergence threshold. In the improved IEEE14 node system, this feature can be used to evaluate the positioning performance of four different monitoring point configuration schemes, and finally obtain the optimal positioning performance configuration scheme.