| 引用本文: | 王冰冰,刘忠,梅军,薛钟兵,范光耀,葛锐,陈武,徐伟凡.基于储能内置式换流器的柔性直流配电网故障快速恢复策略[J].电力自动化设备,2020,40(11): |
| WANG Bingbing,LIU Zhong,MEI Jun,XUE Zhongbing,FAN Guangyao,GE Rui,CHEN Wu,XU Weifan.Fast recovery strategy of flexible DC distribution network based on energy storage built-in converter after fault[J].Electric Power Automation Equipment,2020,40(11): |
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| 摘要: |
| 提出一种适用于柔性直流配电网的故障快速恢复策略。首先提出了一种储能内置式换流器(ESBC)的拓扑结构，并对双极短路故障状态下ESBC闭锁前后的子模块电容电压和故障电流的暂态特性进行分析。进而提出基于储能的故障快速恢复策略，改进故障恢复时序，并提出子模块分阶段充放电策略以抑制冲击电流。最后将提出的协调控制策略与直流配电网相结合，实现在换流器闭锁期间，储能在为重要负荷提供功率以保障其在故障清除期间不间断供电的同时，对闭锁期间的子模块电容电压进行调节以使其在解锁前达到额定值，减小换流器解锁时的电压波动，为换流器重启动缩短时间。在PSCAD/EMTDC仿真平台上搭建了仿真模型，验证了所提策略的有效性。 |
| 关键词: 柔性直流配电网 故障快速恢复 储能内置式换流器 双极短路故障 不间断供电 |
| DOI：10.16081/j.epae.202008028 |
| 分类号:TM46;TM73 |
| 基金项目:国家电网公司科技项目(无直流断路器的直流配电网故障检测及穿越技术研究)(SGJSYZ00FCJS1900339) |
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| Fast recovery strategy of flexible DC distribution network based on energy storage built-in converter after fault |
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WANG Bingbing1, LIU Zhong2, MEI Jun1, XUE Zhongbing2, FAN Guangyao1, GE Rui1, CHEN Wu1, XU Weifan2
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1.School of Electrical Engineering, Southeast University, Nanjing 210096, China;2.State Grid Yangzhou Power Supply Company, Yangzhou 225000, China
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| Abstract: |
| A fast recovery strategy after fault suitable for flexible DC distribution network is proposed. Firstly, the topology of ESBC(Energy Storage Built-in Converter) is proposed, and the transient characteristics of the capacitor voltage and fault current of sub-module under the pole-to-pole short circuit fault condition before and after ESBC blocking are analyzed. Furthermore, the fast recovery strategy after fault based on energy storage is proposed to improve the recovery sequence, and the staged charging and discharging strategy is proposed to suppress the impulse current. Finally, the proposed coordinated control strategy is combined with the DC distribution network, which realizes that during the closing period of converter, the energy storage provides power for the important load to guarantee the uninterrupted power supply during fault clearance period, and meanwhile adjusts the capacitor voltage of sub-module during blocking period to reach the rated value before unlocking, so as to reduce the voltage fluctuation when the converter is unlocked, and shorten the restart time of converter. The effectiveness of the proposed strategy is verified by the simulation model in PSCAD/EMTDC. |
| Key words: flexible DC distribution network fast recovery after fault energy storage built-in converter pole-to-pole short circuit fault uninterrupted power supply |
