Accurate Fault Location in AC/DC Hybrid Line Corridors Based on Eigenvalue Decomposition

Accurate fault location algorithm minimizes the fault searching time and operating cost. This paper proposes an accurate fault algorithm for untranposed multi-phase AC/DC hybrid line corridors in time domain. The proposed method considers the distributed line parameter and applies the eigenvalue decomposition to decouple the system. The Bergeron model is applied to solve the voltage distribution through the line to achieve the fault location. Numerical experiments in a five-phase AC/DC system with only 5 ms data window prove that the proposed method presents higher fault location accuracy compared to fault location results without considering the mutual coupling effects between AC and DC systems, independent of fault types, locations and impedances.