Protection scheme against control winding grounding fault of magnetically controlled shunt reactor based on unbalanced voltage

被引：0
|
作者：
Zheng T. [1 ]
Wei J. [1 ]
Liu X. [1 ]
Li H. [2 ]
Zhang J. [2 ]
Wang K. [2 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing
[2] Nothwest Electric Power Dispatching and Control Sub-Center, Xi'an
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2021年 / 41卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Control winding; Control winding grounding fault protection; DC bus; Grounding fault; Magnetically controlled shunt reactor; Unbalanced voltage;
D O I：
10.16081/j.epae.202101023
中图分类号：
学科分类号：
摘要：
In the actual project, the DC bus overvoltage protection is configured for the control winding grounding fault of the extra-high voltage MCSR(Magnetically Controlled Shunt Reactor). However, under the condition of grounding fault occurring in the end part of control winding, the DC bus does not exhibit AC overvoltage characteristic, which causes the protection to fail to identify the fault. To solve this problem, the characteristics of DC bus pole-to-ground voltage under different conditions, such as control winding groun-ding fault, steady-state operation, two ways of energizing and external faults, are analyzed. Based on this, a protection scheme based on DC bus unbalanced voltage is proposed, which uses the sum of the positive and negative DC bus voltages to construct an unbalanced voltage of DC bus, and identifies the fault based on the characteristic that the DC bus unbalanced voltage rises obviously during control winding grounding fault. The principle of the protection scheme is simple and easy to implement, which overcomes the problem that the conventional protection cannot identify the control winding end part grounding fault. A large number of simulative results based on MATLAB/Simulink verify the effectiveness of the proposed protection scheme. © 2021, Electric Power Automation Equipment Press. All right reserved.
引用
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页码：57 / 63
页数：6
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