基于计算电阻的高压直流输电线路纵联保护

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摘要针对传统高压直流输电线路纵联电流差动保护受线路分布电容影响大、可靠性差的问题,提出一种基于计算电阻的纵联保护方案。利用线路两端故障电压电流的直流分量计算线路的计算电阻,区内故障时,该值相对较小;区外故障时,该值很大。以此为基础,提出了根据故障极与健全极线路上计算功率的差异实现准确选极的方案。该方案对采样率要求低、整定简单明确且不受分布电容电流的影响。理论分析和大量仿真结果表明,该保护选择性好,可靠性高,对高阻接地故障有足够的灵敏性。RTDS试验和现场故障录波数据有效验证了其性能。

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	杨亚宇
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	范春菊
	刘剑

关键词 ：高压直流输电线路, 计算电阻, 纵联保护, 直流分量, 故障附加状态

Abstract：Since the traditional current differential protection for high voltage direct current (HVDC) is significantly influenced by distributed capacitance and of poor reliability, a novel pilot protection algorithm based on calculated resistance is proposed. The calculated resistance is calculated by using the dc component of fault component at both terminals of the line. When internal faults occur, the calculated resistance is relatively low; when external faults occur, the calculated resistance is very high. Upon the basis of that, faulted pole can be identified by the calculated power accurately. The proposed scheme is insensitive to the sampling frequency and independent of distributed capacitive current. Meanwhile, the setting principle can be set in a simple and clear way. Theoretical analysis and comprehensive simulation experiments showed that it operates with high reliability and selectivity under different fault conditions with high fault resistance. In addition, its validity has been verified by real time digital simulator (RTDS) and field data test.

Key words： High voltage direct current(HVDC) transmission line calculated resistance pilot protection DC component fault component network

收稿日期: 2016-01-18 出版日期: 2017-04-17

PACS:

TM773

基金资助:国家自然科学基金(51377104,51177066,51407115)和中国博士后科学基金(2014M560333)资助项目。

通讯作者: 杨亚宇男,1991年生,博士研究生,研究方向为电力系统继电保护与控制。E-mail:1098196711@163.com

作者简介: 邰能灵男,1972年生,教授,博士生导师,研究方向为电力系统继电保护与控制及电力市场。E-mail:nltai@sjtu.edu.cn

引用本文:

杨亚宇,邰能灵,范春菊,刘剑. 基于计算电阻的高压直流输电线路纵联保护[J]. 电工技术学报, 2017, 32(7): 84-94. Yang Yayu,Tai Nengling,Fan Chunju,Liu Jian. A Pilot Protection Scheme for HVDC Transmission Lines Based on Calculated Resistance. Transactions of China Electrotechnical Society, 2017, 32(7): 84-94.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I7/84

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