Study of Protection Terminal Unit with Traveling Waves Based Fault Location for Power Distribution System

Accurate fault location for distribution networks is essential for service restoration and enhancement of system resilience. However, the widespread integration of distributed energy resources brings a challenge to fault location techniques in distribution networks. This paper presents a novel fault location method for active distribution networks based on multi-terminal traveling wave. The proposed method utilizes VMD-TEO to capture the time of arrival of the initial fault traveling wave. The first stage is to identify the preliminary fault section. According to the double-ended traveling wave method and the arrival time of traveling wave at all recorders, a fault section location matrix (FSLM) is built. The second stage is accurate location in the fault section. Considering the uncertainty wave velocity in distribution line, the least squares method is employed for ac-curate fault location. Through extensive simulation studies conducted in PSCAD/EMTDC, the high accuracy effectiveness of the proposed method is verified under various fault locations, and fault types.