Single-Phase Grounding Fault Location in Wind Farm Based on Zero-Sequence Current

doi:10.16182/j.issn1004731x.joss.17-0227

Abstract

Abstract: The wind power system is different from the conventional transmission system, and its collecting line contains multi sections of cable. The collecting line of wind farm adopts overhead line-power cable hybrid transmission form, and its distance is about 3~20km. Wind farm 35kV neutral point grounding method is different from the conventional distribution network, and its neutral point adopts the winding grounding transformer. In hybrid transmission lines, due to the different velocities of traveling wave in power cable and overhead line, the traditional location algorithm for uniform transmission line is not suitable. A new method of single-phase to grounding fault location based on zero-sequence current is put forward. The neutral point grounding method of wind power system is studied, and the method of comparing zero-sequence current similarity is put forward for the single-phase grounding fault. The simulation shows that the proposed method is more adaptable to wind farms.

Key words: wind farm, grounding transformer, hybrid transmission, zero-sequence current, fault location

CLC Number:

TM755

Zheng Yanyan, Zhu Yongli, Liu Tongtong, Su Shanshan. Single-Phase Grounding Fault Location in Wind Farm Based on Zero-Sequence Current[J]. Journal of System Simulation, 2019, 31(7): 1408-1415.

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