Single-Phase-to-Ground Fault Location Method Based on SOGI

[摘要] Most fault location methods depend on the exact extraction of fault transient feature. However, due to the weak grounding current, arc grounding and intermittent problems, it is difficult to extract the fault transient feature. Based on second-order generalized integrator (SOGI), a single-phase-to-ground fault section location method for neutral point ungrounded system is proposed to address this problem in this paper, which avoids the extraction of fault transient feature. Firstly, the fundamental wave phases of zero sequence voltage and zero sequence current are extracted by second-order generalized integrator. Then, the fault position is located based on their phase difference. Finally, the proposed strategy is tested by the simulation data and the field data. The test results show that the method proposed in this paper can accurately locate fault position. Moreover, the phase extraction method based on SOGI is more accurate than traditional Euler method.

[发布机构] China Electric Power Research Institute, No.15 Xiaoying East Road, Qinghe, Beijing; 100192, China^1

[效力级别] 无线电电子学 [学科分类] 计算机科学（综合）

[关键词] Grounding current;Neutral point ungrounded;Second-order generalized integrators;Secondorder generalized integrator (SOGI);Single phase to ground faults;Single-phase-to-ground fault locations;Zero sequence current;Zero sequence voltage