Single-pole grounding fault location method for flexible HVDC transmission lines

Abstract

One of the key problems of flexible HVDC transmission line is HVDC transmission fault location. A fault location method based on an improved traveling wave natural frequency flexible HVDC transmission line single-pole ground fault is proposed. The integrated empirical mode is used to decompose the fault signal to obtain the required traveling wave component, and then the improved MUSIC algorithm is used, according to the frequency spectrum analysis obtains the natural main frequency, and uses the relationship between the natural frequency and the fault distance to gain the fault location. Finally, use PSCAD to build simulation for simulation test and combine MATLAB fault location algorithm program to get the fault distance. The simulation results show that the proposed ranging algorithm is not affected by transition resistance and fault distance, and can accurately obtain the fault point distance, which shows the feasibility and effectiveness of the proposed fault ranging method.