新型多端口直流断路器及其在直流电网保护中的应用

宋冰倩; 赵西贝; 许建中; 赵成勇

doi:10.7500/AEPS20190107004

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新型多端口直流断路器及其在直流电网保护中的应用

研制与开发 | 更新时间：2020-07-14

- 新型多端口直流断路器及其在直流电网保护中的应用
- A Novel Multi-port DC Circuit Breaker and Its Application in Protection of DC Power Grid
- 电力系统自动化 2020年44卷第1期页码：160-167
- 作者机构：
  
  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
- 基金信息：
  
  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)
- DOI：10.7500/AEPS20190107004
  中图分类号：
- 收稿日期：2019-01-07，
  
  修回日期：2019-03-21，
  
  网络出版日期：2019-08-20，
  
  纸质出版日期：2020-01-10
- 稿件说明：
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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(01):160-167.

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(01):160-167.
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(01):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(01):160-167. DOI： 10.7500/AEPS20190107004.

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.

关键词

Keywords

references

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