半月刊

ISSN 1000-1026

CN 32-1180/TP

+高级检索 English
新型多端口直流断路器及其在直流电网保护中的应用
作者:
作者单位:

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:

宋冰倩(1995—),女,硕士研究生,主要研究方向:柔性直流电网。E-mail:13261475106@163.com
赵西贝(1993—),男,通信作者,博士研究生,主要研究方向:柔性直流电网。E-mail:1055248652@qq.com
赵成勇(1964—),男,教授,博士生导师,主要研究方向:高压直流输电与柔性直流输电技术。E-mail:chengyongzhao@ncepu.edu.cn

通讯作者:

基金项目:

国家重点研发计划资助项目(2018YFB0904600);国家自然科学基金资助项目(51777072)。


A Novel Multi-port DC Circuit Breaker and Its Application in Protection of DC Power Grid
Author:
Affiliation:

State Key Laboratory of Alternate Electrical Power System with Renewable Energy

Fund Project:

This work is supported by National Key R&D Program of China (No.2018YFB0904600) and National Natural Science Foundation of China (No. 51777072).

  • 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:

    直流电网中,采用高压直流断路器切除故障线路能够有效清除直流故障,但现有的直流断路器投资成本高,系统正常运行时电力电子器件冗余。文中提出一种新型多端口直流断路器(multi-port DC circuit breaker,MP-DCCB)拓扑,采用单个主断路器保护多条直流线路,利用通流能力大的晶闸管作为主断路器和直流线路间的控制单元,有选择性地切断故障线路。然后,设计了能够吸收限流电感能量的转移支路来降低避雷器需吸收的能量,并对MP-DCCB断路、耗能以及重合闸阶段控制方式及电气过程进行了理论解析,建立了等效数学模型,研究电压电流应力及经济特性与MP-DCCB关键参数的关系。最后,在PSCAD/EMTDC中搭建四端双极直流电网进行仿真验证,MP-DCCB能够有效降低断路器投资成本,具备应用于柔性直流电网的工程价值。

    Abstract:

    In the DC grid, the use of high voltage DC circuit breakers to remove faulty lines can effectively eliminate DC faults, but the existing DC breakers have high investment costs and redundant power electronics during normal system operation. A novel multi-port DC circuit breaker (MP-DCCB) topology is proposed in this paper, which uses a single main circuit breaker to protect multiple DC lines. Thyristors with large current capacity are utilized as control unit to selectively cut off the faulty line between main circuit breaker and DC lines. Then, an energy transfer path which is capable of absorbing the energy of the current limiting inductor is designed to reduce the energy that the arrester needs to absorb, the open circuit of MP-DCCB, energy consumption, control method of reclosing stage and electrical processes are theoretically analyzed, and an equivalent mathematical model is established to study the relationship between voltage, current stress, economic characteristics and key parameters of MP-DCCB. The four-terminal bipolar DC grid is built in PSCAD/EMTDC for simulation verification. MP-DCCB can effectively reduce the investment cost of circuit breakers and has the engineering value applied to flexible DC grids.

    表 1 IGBT数量对比Table 1 Quantity comparison of IGBT
    图1 新型MP-DCCB拓扑结构图Fig.1 Topology diagram of novel MP-DCCB
    图2 断路器在直流电网中的位置示意图Fig.2 Schematic diagram of position of circuitbreaker in DC grid
    图3 断路器后备保护Fig.3 Backup protection of circuit breaker
    图4 电流流经路径图Fig.4 Path diagram of current flow
    图5 MP-DCCB动作过程等效电路Fig.5 Equivalent circuit of MP-DCCB action process
    图6 常规MP-DCCB与所提出的MP-DCCB对比Fig.6 Comparison of common MP-DCCB and proposed MP-DCCB
    参考文献
    相似文献
    引证文献
引用本文

宋冰倩,赵西贝,赵成勇,等.新型多端口直流断路器及其在直流电网保护中的应用[J].电力系统自动化,2020,44(1):160-167. DOI:10.7500/AEPS20190107004.
SONG Bingqian,ZHAO Xibei,ZHAO Chengyong,et al.A Novel Multi-port DC Circuit Breaker and Its Application in Protection of DC Power Grid[J].Automation of Electric Power Systems,2020,44(1):160-167. DOI:10.7500/AEPS20190107004.

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:2019-01-07
  • 最后修改日期:2019-03-21
  • 录用日期:
  • 在线发布日期: 2020-01-04
  • 出版日期: