Analysis of grounding fault on the AC side of converter station in a flexible DC distribution system

被引：0
|
作者：
Zhou Y. [1 ,2 ]
Qin W. [3 ]
Ge J. [1 ,2 ]
Sun J. [1 ,2 ]
Xu X. [3 ]
Dong R. [3 ]
机构：
[1] State Grid Electric Power Research Institute Jiangsu Co., Ltd., Nanjing
[2] State Key Laboratory of Smart Grid Protection and Operational Control, Nanjing
[3] College of Electrical Engineering, Zhejiang University, Hangzhou
来源：
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | 2020年 / 48卷 / 19期
关键词：
AC side single-phase grounded fault; Common-mode current; Common-mode voltage; Flexible DC distribution power system; Grounding method;
D O I：
10.19783/j.cnki.pspc.191396
中图分类号：
学科分类号：
摘要：
In the flexible DC distribution power system, if the converter station is connected to the AC grid via a connecting transformer, the insulation damage between the connecting transformer and the converter valves will cause a grounded fault on the AC side of the converter station. The influence of this grounded fault and the protection strategy is worth researching. First, the equivalent common-mode circuit model of the components in the flexible DC distribution power system is analyzed. Subsequently, the equivalent common-mode circuit model of a flexible five-terminal DC distribution power system with different grounding methods is built. The calculation formulas of fault fundamental frequency common-mode current and voltage after a converter AC side single-phase grounded fault occurs are obtained. Then, considering various resonances that may exist in a DC system, a protection strategy based on a converter DC side fundamental frequency common-mode voltage, current and power direction to identify the single-phase grounded fault on the converter AC side is proposed and verified on the PSCAD platform. © 2020, Power System Protection and Control Press. All right reserved.
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页码：160 / 167
页数：7
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