Continuous comprehensive line selection technology based on D-S evidence theory

Aiming at the single-phase grounding fault in 380 V three-phase AC power system with ungrounded neutral, a fault line selection method considering zero sequence current ratio method, zero sequence current phase ratio method and dual frequency method is proposed in this paper, which makes full use of the fault information such as zero sequence current and insulation resistance to ground of each branch when single-phase grounding fault occurs, The fault degree function and reliability function corresponding to each line selection method are constructed to form a comprehensive line selection strategy. After continuous comprehensive line selection, the multiple comprehensive line selection results are fused by using D-S evidence theory to obtain the final line selection results. The simulation calculation on MATLAB/ Simulink platform shows that this method is feasible and improves the accuracy of line selection to a great extent. (C) 2022 The Author(s). Published by Elsevier Ltd.

Automated summary

A fault line selection method for single-phase grounding faults in 380 V three-phase AC power systems is proposed in this paper. The method considers the zero sequence current ratio method, the zero sequence current phase ratio method, and the dual frequency method to comprehensively consider fault information. By using continuous comprehensive line selection and D-S evidence theory fusion, the accuracy of line selection is greatly improved.