半月刊

ISSN 1000-1026

CN 32-1180/TP

+高级检索 English
柔性直流电网直流线路故障的过电压机理分析
作者:
作者单位:

1.南方电网能源发展研究院有限责任公司,广州市 510663;2.新能源电力系统国家重点实验室(华北电力大学),北京市 102206

作者简介:

李岩(1990—),男,通信作者,博士,主要研究方向:柔性直流电网的保护与控制。E-mail: whu_liyan1990@163.com
黄豫(1978—),男,高级工程师,主要研究方向:电力系统规划设计。E-mail: huangyu6@csg.cn
龚雁峰(1977—),男,教授,博士生导师,主要研究方向:电力系统继电保护、稳定与控制。E-mail: yanfeng.gong@ ncepu.edu.cn

通讯作者:

基金项目:


Analysis on Overvoltage Mechanism of DC Line Fault in Flexible DC Grid
Author:
Affiliation:

1.Energy Research Institute of China Southern Power Grid Company Limited, Guangzhou 510663, China;2.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources;(North China Electric Power University), Beijing 102206, China

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    针对对称单极结构的MMC型柔性直流输电系统,首先深入分析了直流侧单、双极短路的故障电流演变规律,进而揭示了非故障极充电和波过程分别是导致单极接地故障和双极短路故障过电压的主要原因。然后,以一个三端柔性直流电网为例进行仿真验证,并重点分析了不同因素对过电压的影响。研究结果表明,故障电阻对过电压峰值影响较大,而换流站闭锁、接地方式、线路保护等因素的影响较小。最后,对单极、双极故障过电压进行了总结和对比分析。

    Abstract:

    For MMC-based flexible DC grid with symmetric monopolar topology, this paper firstly studies the evolution law of fault currents of single-pole grounding fault and bipolar short-circuit fault, and thus reveals that non-faulted line charging process and fault waves are respectively the main reasons for the overvoltage of single-pole grounding fault and bipolar short-circuit fault. Secondly, a three-terminal flexible DC grid is used for simulation and verification, and the influences of different factors on overvoltage are analyzed. The results show that the fault resistance has a great effect on the peak value of the overvoltage, while the converter blocking, grounding scheme and line protection have few effects. Finally, the overvoltage of single-pole grounding fault and bipolar short-circuit fault are summarized and compared.

    表 3 Table 3
    表 1 Table 1
    表 2 Table 2
    图1 双极短路故障的波过程Fig.1 Wave process of bipolar short-circuit fault
    图2 单极接地故障放电回路Fig.2 Discharging circuit of the single-pole grounding fault
    图3 非故障极充电等效电路Fig.3 Equivalent circuit of charging path of non-faulted pole
    图4 测试系统示意图Fig.4 Schematic diagram of test system
    图5 单极接地故障的仿真结果Fig.5 Simulation results of single-pole grounding fault
    图 初始故障波到达时的系统等效电路Fig. The equivalent circuit of the converter when the initial wave arrives
    图 非故障线路的初始故障波Fig. The initial fault waves in non-faulted lines
    图 不同接地方式的故障电流路径:(a)直流侧接地;(b)换流变中性点接地Fig. The fault current path for different grounding scheme: (a) DC side; (b) Transfomer neutral point
    图 双极短路的仿真结果Fig. The simulation results for bipolar fault
    图 非故障线路仿真结果Fig. The simulation results for non-faulted line
    图 闭锁后的仿真结果Fig. The simulation results after blocking
    图 闭锁后的电流通路Fig. The current path after blocking
    图 直流线路模型Fig. The DC line model
    图 非故障线路的仿真结果Fig. The simulation results of non-faulted line
    图 不同接地方式的仿真结果Fig. The simulation results of different grounding scheme
    图 不同故障场景的仿真结果Fig. The simulation results of different fault scenarios
    图 换流站闭锁后的直流侧电压Fig. The DC voltage after converter blocking
    图 闭锁后仿真结果:(a) 桥臂电流; (b) 充电电流Fig. The simulation results after blocking: (a) arm current; (b) charging current
    参考文献
    相似文献
    引证文献
引用本文

李岩,黄豫,龚雁峰,等.柔性直流电网直流线路故障的过电压机理分析[J].电力系统自动化,2020,44(5):146-153. DOI:10.7500/AEPS20190425008.
LI Yan,HUANG Yu,GONG Yanfeng,et al.Analysis on Overvoltage Mechanism of DC Line Fault in Flexible DC Grid[J].Automation of Electric Power Systems,2020,44(5):146-153. DOI:10.7500/AEPS20190425008.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2019-04-25
  • 最后修改日期:2019-09-02
  • 录用日期:
  • 在线发布日期: 2020-03-08
  • 出版日期: