Research on Short-Circuit Fault Location Technology of Active Distribution Network

The widespread integration of distributed generators (DG) has resulted in changes in the direction of current and power in distribution networks, which presents challenges to the accuracy of traditional fault location methods. In this paper, a fault location method that utilizes an external excitation source is proposed for short-circuit faults in medium- voltage distribution networks with DGs. Considering the influence of the natural variation of line parameters on location accuracy, the line parameters are treated as unknowns. Assuming that the fault occurs in different sections of the hybrid line and based on the abundant frequency components of the signal, multiple sets of location equations at different frequencies are constructed to determine the fault distance. Theoretical results and simulated analysis confirm effectiveness of this method.