Open Access

ARTICLE

Protection of Zero-Sequence Power Variation in Mountain Wind Farm Collector Lines Based on Multi-Mode Grounding

by Hongchun Shu^1,2, Yaqi Deng^1,2,*, Pulin Cao², Jun Dong², Hongjiang Rao², Zhiqian Bo²

1 Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, 650093, China
2 Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming, 650500, China

* Corresponding Author: Yaqi Deng. Email:

(This article belongs to the Special Issue: Wind Energy Development and Utilization)

Energy Engineering 2022, 119(2), 523-538. https://doi.org/10.32604/ee.2022.015570

Received 28 December 2020; Accepted 19 February 2021; Issue published 24 January 2022

Abstract

The arc-suppression coil (ASC) in parallel low resistance (LR) multi-mode grounding is adopted in the mountain wind farm to cope with the phenomenon that is misoperation or refusal of zero-sequence protection in LR grounding wind farm. If the fault disappears before LR is put into the system, it is judged as an instantaneous fault; while the fault does not disappear after LR is put into the system, it is judged as a permanent fault; the single-phase grounding fault (SLG) protection criterion based on zero-sequence power variation is proposed to identify the instantaneous-permanent fault. Firstly, the distribution characteristic of zero-sequence voltage (ZSV) and zero-sequence current (ZSC) are analyzed after SLG fault occurs in multi-mode grounding. Then, according to the characteristics that zero-sequence power variation of non-fault collector line is small, while the zero-sequence power variation of fault collector line can reflect the active power component of fault resistance, the protection criterion based on zero-sequence power variation is constructed. The theoretical analysis and simulation results show that the protection criterion can distinguish the property of fault only by using the single terminal information, which has high reliability.

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Keywords

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