| 引用本文: | 赵坚鹏,赵成勇,许建中,郭春义.直流电网中超导限流器与高压直流断路器的协调配合方法[J].电力自动化设备,2018,(11): |
| ZHAO Jianpeng1,ZHAO Chengyong1,XU Jianzhong1,GUO Chunyi1.Coordination between superconducting current limiter and high voltage DC circuit breaker in DC grid[J].Electric Power Automation Equipment,2018,(11): |
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| 摘要: |
| 为缓和直流电网中直流断路器(DCCB)的最大切除时间和切断故障电流大小之间的矛盾，研究超导限流器(SFCL)抑制直流故障电流的方法，提出一种SFCL与DCCB的协调配合方案。分析了不同阻值SFCL的限流特性，并针对超导体并联电阻值、限流电抗值等影响因素进行了比较，在此基础上提出了SFCL与DCCB的时序配合条件。在PSCAD/EMTDC中搭建了含SFCL的5端直流电网测试模型，仿真结果验证了SFCL的故障限流特性，通过合理选择SFCL参数与限流电抗器值可以有效抑制故障电流值，减少DCCB中耗能支路耗散的能量，加速故障隔离过程。 |
| 关键词: 直流电网 超导限流 直流断路器 时序配合 |
| DOI：10.16081/j.issn.1006-6047.2018.11.018 |
| 分类号:TM721.1 |
| 基金项目:国家自然科学基金资助项目(51777072) |
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| Coordination between superconducting current limiter and high voltage DC circuit breaker in DC grid |
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ZHAO Jianpeng1, ZHAO Chengyong1, XU Jianzhong1, GUO Chunyi1
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1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
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| Abstract: |
| In order to mitigate the contradiction between the maximum cut-off time and the cut-off short-circuit capacity of the DCCB(DC Circuit Breaker) in DC grid, the method of suppressing DC fault current by SFCL(Superconducting Fault Current Limiter) is studied, and the scheme of coordination between SFCL and DCCB is proposed. The current limiting characteristics of SFCLs with different resistance values are analyzed, and different influence factors including superconductor parallel resistance value and current limiting reactance are compared, based on which, the sequential coordination conditions of SFCL and DCCB in pole-to-pole fault are proposed. The model of five-terminal DC grid is built in PSCAD/EMTDC. The simulative results verified the fault current limiting characteristics of SFCL. By reasonably selecting parameters and reactor values of SFCL, the fault current can effectively be suppressed, the energy dissipated by the energy dissipation branch of DCCB can be reduced, and the fault isolation process can be accelerated. |
| Key words: DC grid superconducting current limit DC circuit breaker sequential coordination |
