| 引用本文: | 冯怿彬,张雪松,汪湘晋,赵波,郭力.基于主动探测的直流微电网故障区段辨识与快速恢复策略[J].电力自动化设备,2021,41(5): |
| FENG Yibin,ZHANG Xuesong,WANG Xiangjin,ZHAO Bo,GUO Li.Fault section identification and fast recovery strategy for DC microgrid based on active detection[J].Electric Power Automation Equipment,2021,41(5): |
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| 摘要: |
| 直流微电网是未来智能配用电系统的重要组成部分。直流系统故障时，冲击电流上升速度快，可供保护获取的数据信息极少，严重影响直流保护的故障诊断。将电力电子变流器的故障控制与保护相结合，提出了一种基于主动探测的直流微电网故障区段辨识与快速恢复策略，通过增加AC-DC变流器的故障控制模块，使其具有主动注入短路电流的能力，进一步协同直流保护装置，实现对故障位置的准确识别和快速隔离。同时，各变流器还能基于本地电压和探测电流信息自动诊断故障消除情况，以快速恢复系统运行。基于实时数字仿真平台的仿真结果表明，所提策略能够在故障发生后100 ms内完成故障定位与隔离，大幅降低了对系统供电的影响，具有一定的工程应用价值。 |
| 关键词: 直流微电网 故障区段辨识 直流保护 主动探测 故障恢复 |
| DOI：10.16081/j.epae.202103008 |
| 分类号:TM77;TM727 |
| 基金项目:国家重点研发计划资助项目(2020YFB1506800) |
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| Fault section identification and fast recovery strategy for DC microgrid based on active detection |
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FENG Yibin1, ZHANG Xuesong1, WANG Xiangjin1, ZHAO Bo1, GUO Li2
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1.State Grid Zhejiang Electric Power Research Institute, Hangzhou 310014, China;2.Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
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| Abstract: |
| DC microgrid will be an important part of intelligent power distribution and consumption system in the future. When DC system fault occurs, the impulse current rises quickly, and the data windows for protection is extremely short, which leads to affect the fault diagnosis of DC protection seriously. A fault section identification and fast recovery strategy for DC microgrid based on active protection is proposed through the coordination of fault control and protection of power electronic converter, where a fault control module for AC-DC converter is designed to inject controllable short circuit current to the fault point, and further cooperate with DC protection device to realize accurate identification and rapid isolation for fault loca-tion. Meanwhile, each converter in DC microgrid can also diagnose the fault removal situation automatically based on the local voltage and injection current information, so as to restore system operation quickly. The simulative results based on RTDS(Real-Time Digital Simulation) platform show that the proposed strategy can accurately locate and isolate fault within 100 ms after DC fault occurs, and significantly reduce the impact on power supply. Therefore, it has certain practical application value. |
| Key words: DC microgrid fault section identification DC protection active detection fault recovery |
