A Novel Fault Location Method for HVDC Transmission Lines

Considering the frequency-dependent characteristics of line parameters, a novel fault location method for high voltage direct current (HVDC) transmission lines is proposed in this paper. It is of great significance to accurately establish transmission line model. Firstly, the distributed and frequency-dependent characteristics of transmission line parameter are analyzed. Then, according to the idea of digital filter, a more practical formula for calculating the voltage and current of transmission line considering the frequency-dependent line parameters is proposed. Using the new formula, a fault location algorithm can be constructed based on the principle that the voltage distribution calculated from two ends of the line is equal at the fault point. Theoretical analysis and simulation results show that more accurate fault-location results can be obtained by the proposed algorithm.