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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
作者:
作者单位:

1.上海交通大学大学电子信息与电气工程学院;2.国网浙江省余姚市供电有限公司

作者简介:

通讯作者:

基金项目:

国家自然科学基金青年基金;2019上海市教委科研创新重大项目


High-frequency Power Pilot Protection Method for Multi-terminal Flexible DC Distribution Network
Author:
Affiliation:

1.School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai,China;2.State Grid Zhejiang Yuyao Power Supply Company,Zhejiang,China

Fund Project:

Youth Fund of NSFC;2019 Major Scientific Research and Innovation Project of Shanghai Education Commission

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    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;利用不同故障情形时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。在MATLAB/SIMULINK建立多端柔性直流配电网模型,仿真结果表明,保护方法可快速、准确判断故障线路和故障极,阈值易设计且相邻线路保护无需配合,灵敏度与可靠性高,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 difficulty is the accurate identification and rapid isolation of fault section. The distribution characteristics of the transient high-frequency components in DC distribution network after fault are analyzed, and a pilot protection method based on the transient high-frequency power for DC lines is proposed. According to the amplitude change of the high-frequency power before and after the fault, the protection fast start criterion is proposed. According to the difference of linear relationship and correlation coefficient of high-frequency power on both sides of the line under 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. In 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 design and not required for protection coordination of adjacent lines. Moreover, it has low requirements for data synchronization, and has good insusceptibility to fault resistance. Protection method is not affected by system operation mode and network topology.

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引用本文

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/OL].电力系统自动化,http://doi.org/10.7500/AEPS20200105002.
CHEN Shaoyu,HUANG Wentao,TAI Nengling,et al.High-frequency Power Pilot Protection Method for Multi-terminal Flexible DC Distribution Network[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20200105002.

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  • 收稿日期:2020-01-05
  • 最后修改日期:2020-05-13
  • 录用日期:2020-04-11
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