Optimal Injection Current Calculation and Implementation of Flexible Grounding Device for Suppressing Ferromagnetic Resonance

被引：0

作者：

Lu P. ^{[1
]}

Wang W. ^{[1
]}

Liu P. ^{[2
]}

Liu Q. ^{[1
]}

Zeng X. ^{[1
]}

Li J. ^{[3
]}

机构：

[1] School of Electrical & Information Engineering, Changsha University of Science and Technology, Hunan Province, Changsha

[2] State Grid Hunan Electric Power Co., Ltd., Yongzhou Power Supply Branch, Hunan Province, Yongzhou

[3] Hunan Provincial Key Laboratory for Control Technology of Distributed Electric Propulsion Aircraft, Hunan Province, Changde

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2023年 / 43卷 / 04期

基金：

中国国家自然科学基金;

关键词：

distribution network; electromagnetic voltage transformer; grounding device; optimal ferromagnetic resonance suppression;

D O I：

10.13334/j.0258-8013.pcsee.212523

中图分类号：

学科分类号：

摘要：

The flexible grounding device realizes zero-sequence energy discharge by injecting current into the neutral point of the distribution network, which is an effective mean of suppressing ferromagnetic resonance. Aiming at the problem of different selection criteria for harmonic elimination currents of existing flexible grounding devices, this paper proposes a method for calculating and implementing the best harmonic elimination current. By analyzing the equivalent circuit of the single-phase grounding fault distribution network at the moment of fault removal, the transfer function model of the system is obtained, and the conclusion that the damping vibration system consumes the fastest energy in the critical resistance state is used to calculate the fastest suppression of ferromagnetic resonance harmonic elimination resistance value, and then obtain the best harmonic elimination current of the flexible grounding device. Aiming at the problem of ferromagnetic resonance overvoltage caused by single-phase grounding fault, the realization process and control method of the flexible grounding device injecting the best harmonic elimination current are described. Simulation and experimental results show that the proposed method can deplete the resonance energy in a short time so that the system is out of resonance and achieve the effect of quickly suppressing the ferromagnetic resonance overvoltage. ©2023 Chin.Soc.for Elec.Eng.

引用

页码：1438 / 1448

页数：10

共 21 条

[21] LI Xiaobo, LIU Baowen, WANG Chonglin, Zero-Sequence voltage locus of resonant grounded system and its accurate control[J], Power System Technology, 37, 9, pp. 2669-2674, (2013)

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