Fault Location Method for Low Voltage Active Distribution Network Based on Phase-angle Differences of the Clark Currents

Since more and more distributed generators(DGs) are connected into low voltage distribution network, it has become a complex and changeable active network, which makes the fault location methods for distribution network based on single-point measurements failed for lacking self-adaptive. In this paper, the changes of phase-angle differences of the Clark currents of low voltage active distribution network section between pre-fault and fault are studied, the criterion of fault in/out of the section is obtained, and a fault location method for low voltage active distribution network(ADN) is proposed. The proposed method requires the current measurement only. The local units are utilized in the proposed method for equivalent high frequent sampling of the phase-angles of the Clark currents of nodes at both ends of each section. The control center is used in this method to compute the phase-angle differences of the Clark currents of all the sections centrally for fast fault location. Verification of the proposed method has been carried out by Matlab/Simulink. In addition, the method can locate the fault section accurately in micro-grid under interconnecting or islanding operation.