Fault location method for HVDC transmission lines on the basis of the distributed parameter model

A novel fault location method using single terminal data is proposed. It's different from those based on the traveling wave theory. It can be applied to high voltage direct current (HVDC) transmission lines. Based on the distributed parameter model, the voltage and current distributions can be calculated using the voltage and current measured in the local terminal. According to the calculated distribution voltage and current over the line, transition resistor can be computed and the fault can be located according to the principle that the variance of the calculated transition resistor is minimum at the fault point. The algorithm, which is performed in time domain, needs a very short data window and can achieve satisfactory accuracy. Simulation results show that the fault of HVDC transmission lines can be located quickly and accurately with the proposed method.