A fault location method for flexible HVDC transmission lines using the linear interpolation

It is difficult to accurately calibrate the traveling wave head and calculate the wave velocity by using the single-ended traveling wave location method. In this paper, a dynamic first traveling wave energy that varies with the fault distance by deeply analyzing the attenuation characteristics of the line transmission function on each first traveling wave frequency component. The maximum first traveling wave energy, namely the main frequency component, monotonically decays with the increase of fault distance, showing a one-to-one mapping relationship with the fault distance. On this basis, this paper proposes a single-ended fault location method for flexible HVDC transmission lines using the linear interpolation. The positioning results are calculated using the linear interpolation method on the distance-initial traveling wave main frequency component curve. The simulation results show that the proposed positioning method eliminates the dependence of traditional single-ended traveling wave positioning methods on the wave head calibration and the wave velocity calculation. The absolute positioning error is less than 0.6km, and the positioning result is not affected by transition resistance.