Fault Analysis and Protection Scheme for Converter AC Three-phase Grounding of Bipolar HVDC Systems

被引：0
|
作者：
Xue S. [1 ]
Fan B. [1 ]
Liu C. [1 ]
Lu J. [1 ]
Liu B. [1 ]
机构：
[1] Key Laboratory of Smart Grid, Tianjin University, Tianjin
来源：
Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 01期
基金：
国家重点研发计划;
关键词：
Bipolar HVDC transmission system; Converter AC grounding fault; Fault characteristics; Multi-terminal direct current; Protection scheme;
D O I：
10.13336/j.1003-6520.hve.20181229002
中图分类号：
学科分类号：
摘要：
With the increase of voltage level and transmission capacity, the bipolar wiring mode has become popular in actual high voltage direct current (HVDC) projects. The AC grounding fault of converter will cause serious harm to bipolar HVDC systems. Therefore, the fast protection scheme of HVDC system converters comes to be particularly important. In this paper, three-phase grounding fault transient characteristics in a multi-terminal DC power grid, based on bipolar wiring mode, are analyzed firstly. And mathematic expressions of each component of fault current are derived. Then, a fast protection scheme is proposed for bipolar HVDC system with metallic return according to the fault transient characteristics. Moreover, the scheme utilizes arm current of converter for fault identification and is verified to have the advantages of fast action speed, high reliability and the ability to resist the transition resistance. A four-terminal DC power grid model is established in PSCAD/EMTDC, and the validity of the protection scheme under different fault conditions is verified by simulation results. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：21 / 30
页数：9
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