A New Fault-Location Algorithm for Series-Compensated Double-Circuit Transmission Lines Based on the Distributed Parameter Model

Abstract

A new two-terminal fault-location algorithm for series-compensated double-circuit transmission lines based on the distributed parameter line model is proposed. The system is considered as fully transposed, and a six-sequence component network is introduced to decouple the mutual electromagnetic effects between circuits. Two subroutines designated for the fault that occurs on the left or right side of the series compensator are developed. In each subroutine, the voltage of the series-compensated device is eliminated based on the fact that the sequence voltages calculated from two sides are equal at the fault point. The fault-location function is constructed by utilizing the feature in which the transition resistance is purely resistant at the fault point. The proposed algorithm does not rely on the equivalent model of a series-compensated device. Moreover, it does not require the fault type to be known, and there are no fault-location identification and pseudoroot elimination problems. PSCAD is employed to generate numerous fault cases in diverse conditions and the high accuracy of the proposed fault-location algorithm is validated in MATLAB.