半月刊

ISSN 1000-1026

CN 32-1180/TP

+高级检索 English
基于暂态电流的MMC-LVDC双极短路故障定位方法
作者:
作者单位:

1.电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市 200240;2.河海大学能源与电气学院, 江苏省南京市 210098;3.国网江苏省电力有限公司南京供电分公司,江苏省南京市 210019

摘要:

随着分布式电源和直流负荷的大量接入,直流配电系统相较于交流系统更具优势。故障定位是直流配电网可靠、优质供电的关键支撑技术之一。分析了模块化多电平换流器(MMC)型柔性直流配电网双极短路故障暂态特性,提出了一种基于子模块闭锁后初始阶段暂态电流的故障精确定位方法,建立了双端MMC型柔性直流配电网的等效电路,推导了直流电流的时域表达式,构建包含故障距离和过渡电阻2个未知参数的时域方程组,并利用最小二乘法进行求解。该方法适用于不同接地方式。在PSCAD/EMTDC中搭建了双端柔性直流配电网模型。仿真结果验证了该方法的有效性、可靠性与准确性,针对两端换流站参数不对称和过渡电阻时变场景,所提方法也具有很高的定位精度。

关键词:

基金项目:

国家自然科学基金资助项目(51807117);上海市科技英才扬帆计划资助项目(17YF1410200);上海市教委科研创新重大项目(2019-01-07-00-02-E00044)。

通信作者:

作者简介:

高校平(1996—),男,硕士研究生,主要研究方向:柔性直流配电网故障测距。E-mail:xpgao123@sjtu.edu.cn
黄文焘(1988—),男,通信作者,副教授,硕士生导师,主要研究方向:微电网综合能源系统控制与保护技术。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。E-mail:nltai@sjtu.edu.cn


Transient Current Based Fault Location Method of Pole-to-pole Short-circuit for Modular Multilevel Converter Low-voltage Direct Current
Author:
Affiliation:

1.Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education (Shanghai Jiao Tong University), Shanghai 200240,China;2.College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China;3.Nanjing Power Supply Company of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210019, China

Abstract:

With the integration of large number of distributed power sources and DC loads, the DC distribution system has more advantages than AC system. Fault location is one of the key supporting technologies for reliable and high-quality power supply of DC distribution network. This paper analyzes the transient characteristics of the pole-to-pole short-circuit fault in the modular multilevel converter (MMC) based flexible DC distribution network and proposes a precise fault location method based on the transient current at the initial stage after the blocking of the sub modules. The equivalent circuit of two-terminal MMC based flexible DC distribution network is established. The time-domain expression of DC current is derived, the time-domain equations including two unknown parameters of fault distance and transition resistance are constructed, and the least square method is used to solve the equations. The method is suitable for different grounding modes. In PSCAD/EMTDC, a two-terminal flexible DC distribution network model is built. The simulation results verify the effectiveness, reliability and accuracy of the method. The proposed method also has high location accuracy for the scene of asymmetric parameters and time-varying transition resistance of converter stations at both terminals.

Keywords:

Foundation:
This work is supported by National Natural Science Foundation of China (No. 51807117), Shanghai Sailing Program (No. 17YF1410200), Major Scientific Research and Innovation Projects of Shanghai Education Commission (No. 2019-01-07-00-02-E00044).
引用本文
[1]高校平,黄文焘,邰能灵,等.基于暂态电流的MMC-LVDC双极短路故障定位方法[J].电力系统自动化,2020,44(17):127-135. DOI:10.7500/AEPS20200106004.
GAO Xiaoping, HUANG Wentao, TAI Nengling, et al. Transient Current Based Fault Location Method of Pole-to-pole Short-circuit for Modular Multilevel Converter Low-voltage Direct Current[J]. Automation of Electric Power Systems, 2020, 44(17):127-135. DOI:10.7500/AEPS20200106004.
复制
分享
历史
  • 收稿日期:2020-01-06
  • 最后修改日期:2020-03-31
  • 录用日期:
  • 在线发布日期: 2020-09-03
  • 出版日期:
相关附件