基于暂态电流Pearson相关性的两电平VSC-HVDC直流线路故障判别

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摘要

为提高柔性直流(VSC-HVDC)输电系统的直流线路故障处理能力,提出了一种基于暂态电流相关性的直流线路故障判别方法。直流线路发生区内、外故障时,直流线路两端的电容支路暂态电流与直流线路入口处暂态电流特征差异明显;利用Pearson相关系数来描述电容支路与线路入口处暂态电流的差异程度,直流线路故障的判别仅通过线路两端计算的暂态电流Pearson相关系数即可实现。该故障判别方法可克服非故障线路馈入电流的影响,适用于两端以及多端柔性直流输电系统。分析和仿真结果表明,该故障判别方法不受高频分量、数据同步、故障位置与类型、噪声干扰以及控制方式等因素的影响,能准确地识别直流线路区内、外故障,实现故障线路的选择。

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	刘剑
	邰能灵
	范春菊
	郑晓冬
	黄文焘

关键词 ：多端柔性直流, 故障处理, 暂态电流, Pearson相关系数, 故障判别

Abstract：

A novel method of fault identification for dc line based on the correlation of transient current is proposed to improve the fault-handling ability of VSC-HVDC transmission system. The difference of the transient current at parallel capacitor branch and dc line entrance is significant between the internal and external fault of dc line. Pearson correlation coefficient is used to measure the difference between the transient currents, by which the fault identification can be achieved easily by calculating the correlation coefficients at both ends of the faulted line. The proposed method is able to eliminate the influence of the contribution from non-faulted line and it is suitable for two-terminal and multi-terminal VSC-HVDC system. The results of the analysis and the simulations show that the proposed method is able to identify the internal and external faults of dc line and select the fault line accurately without the influence of high-frequency component, data synchronization, fault types and fault location, noise interference and the control mode of VSC-HVDC system.

Key words： Multi-terminal VSC-HVDC fault handling transient current Pearson correlation coefficient fault identification

收稿日期: 2015-10-14 出版日期: 2017-02-27

PACS:

TM773

基金资助:

国家自然科学基金项目资助(51377104,51407115)。

通讯作者: 刘剑男,1990年生,博士研究生,研究方向为高压直流与柔性直流输电保护与控制。E-mail:scut_liujian@163.com(通信作者)

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和电力系统综合自动化。E-mail:nltai@sjtu.edu.cn

引用本文:

刘剑, 邰能灵, 范春菊, 郑晓冬, 黄文焘. 基于暂态电流Pearson相关性的两电平VSC-HVDC直流线路故障判别[J]. 电工技术学报, 2017, 32(3): 74-85. Liu Jian, Tai Nengling, Fan Chunju, Zheng Xiaodong, Huang Wentao. A Fault Identification Method for Two-Level VSC-HVDC DC Line Based on Pearson Correlation of Transient Current. Transactions of China Electrotechnical Society, 2017, 32(3): 74-85.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I3/74

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