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多端柔性直流配电网高频功率相关性纵联保护方法
Pilot Protection Method for Multi-terminal Flexible DC Distribution Network Based on Correlation of High-frequency Power
- 电力系统自动化-方正平台 2020年44卷第19期 页码：150-159
- 作者机构：
1.上海交通大学电子信息与电气工程学院，上海市 200240
2.国网浙江省电力有限公司余姚市供电公司，浙江省宁波市 315400
- 作者简介：
陈少宇(1995—)，男，硕士研究生，主要研究方向：直流配电网继电保护。E-mail：chenshaoyu@sjtu.edu.cn
黄文焘(1988—)，男，通信作者，副教授，博士生导师，主要研究方向：配电网、微电网和分布式新能源控制与保护。E-mail：hwt8989@sjtu.edu.cn
邰能灵(1972—)，男，教授，博士生导师，主要研究方向：电力系统继电保护和电力系统综合自动化。E-mail：nltai@sjtu.edu.cn
- 基金信息：上海市教委科研创新重大项目(2019-01-07-00-02-E00044);国家自然科学基金青年基金资助项目(51807117);上海市青年科技英才扬帆计划资助项目(17YF1410200)
DOI：10.7500/AEPS20200105002
中图分类号：收稿日期：2020-01-05，
修回日期：2020-04-03，
网络出版日期：2020-05-21，
纸质出版日期：2020-10-10
- 稿件说明：
移动端阅览
陈少宇,黄文焘,邰能灵等.多端柔性直流配电网高频功率相关性纵联保护方法[J].电力系统自动化,2020,44(19):150-159.
CHEN Shaoyu,HUANG Wentao,TAI Nengling,et al.Pilot Protection Method for Multi-terminal Flexible DC Distribution Network Based on Correlation of High-frequency Power[J].Automation of Electric Power Systems,2020,44(19):150-159.
陈少宇,黄文焘,邰能灵等.多端柔性直流配电网高频功率相关性纵联保护方法[J].电力系统自动化,2020,44(19):150-159. DOI： 10.7500/AEPS20200105002.
CHEN Shaoyu,HUANG Wentao,TAI Nengling,et al.Pilot Protection Method for Multi-terminal Flexible DC Distribution Network Based on Correlation of High-frequency Power[J].Automation of Electric Power Systems,2020,44(19):150-159. DOI： 10.7500/AEPS20200105002.
摘要
直流线路保护是保障多端柔性直流配电网系统安全稳定运行的关键，主要技术难点在于故障区段的准确识别和快速隔离。文中分析了故障后直流配电网中暂态高频分量的分布特点，提出一种基于高频功率的直流线路纵联保护方法。利用故障前后高频功率的幅值变化，提出保护快速启动判据。利用不同故障情形下线路两侧高频功率线性关系和相关系数的差异，提出基于线路两侧高频功率相关系数的故障识别和选极判据。基于MATLAB/Simulink建立多端柔性直流配电网模型，仿真结果表明所提保护方法可快速、准确地判断故障线路和故障极，灵敏度与可靠性高，阈值易设定且相邻线路保护无须配合，对双端数据同步要求较低，不受系统运行方式影响和网络拓扑的限制，且具备良好的抗过渡电阻能力。
Abstract
DC line protection is the key to ensure the safe and stable operation of the multi-terminal flexible DC distribution system. The main technical difficulties include the accurate identification and rapid isolation of the fault section. Distribution characteristics of the transient high-frequency components in DC distribution network after the fault are analyzed
and a pilot protection method for DC lines based on the transient high-frequency power is proposed. Based on the amplitude variation of the high-frequency power before and after the fault
the fast starting criterion for protection is proposed. According to the difference of linear relationship and correlation coefficient of high-frequency power on both sides of the line in different fault conditions
fault identification and pole selection criterion based on correlation coefficient of high-frequency power on both sides of the line is proposed. Based on MATLAB/Simulink
a multi-terminal flexible DC distribution network model is established. The simulation results show that the proposed protection method can quickly and accurately identify the fault line and fault pole with high sensitivity and reliability. Protection threshold is easy to be set and the protection coordination of adjacent lines is not required. Moreover
it has low requirements for data synchronization
and is not affected by system operation mode and network topology with good insusceptibility to fault resistance.
关键词
Keywords
references
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