DC Fault Detection and Location in Meshed Multiterminal HVDC Systems Based on DC Reactor Voltage Change Rate

被引:293
作者
Li, Rui [1 ]
Xu, Lie [1 ]
Yao, Liangzhong [2 ]
机构
[1] Univ Strathclyde, Dept Elect & Elect Engn, Glasgow G1 1XW, Lanark, Scotland
[2] China Elect Power Res Inst, Xiaoying Rd, Beijing 100192, Peoples R China
基金
英国工程与自然科学研究理事会;
关键词
DC fault protection; dc reactor voltage change rate; fault detection; modular multilevel converter (MMC); meshed multiterminal HVDC system; MODULAR MULTILEVEL CONVERTER; OPERATION; DESIGN; MODEL;
D O I
10.1109/TPWRD.2016.2590501
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The change rate of the dc reactor voltage with pre-defined protection voltage thresholds is proposed to provide fast and accurate dc fault detection in a meshed multiterminal HVDC system. This is equivalent to the measurement of the second derivative of the dc current but has better robustness in terms of electromagnetic-interference noise immunization. In addition to fast dc fault detection, the proposed scheme can also accurately discriminate the faulty branch from the healthy ones in a meshed dc network by considering the voltage polarities and amplitudes of the two dc reactors connected to the same converter dc terminal. Fast fault detection leads to lower fault current stresses on dc circuit breakers and converter equipment. The proposed method requires no telecommunication, is independent of power-flow direction, and is robust to fault resistance variation. Simulation of a meshed three-terminal HVDC system demonstrates the effectiveness of the proposed dc fault detection scheme.
引用
收藏
页码:1516 / 1526
页数:11
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