柔性直流配电网系统操作过电压的研究
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摘要
操作过电压严重影响着柔性直流配电设备的安全运行,对其产生机理进行研究具有重要意义。以±10 k V柔性直流典型配电网为例,详细分析了交流侧区域、换流器区域和直流线路区域可能发生的各类故障,包括交流单相接地、阀底接地、阀顶接地、阀顶极间短路、桥臂短路、直流断路器误动作、线路单极接地和线路双极短路等故障类型,深入研究了各类操作过电压的产生机理。在系统控制保护和配置避雷器的基础上,详细统计了系统关键位置及设备的最大过电压水平。研究结果可为柔性直流配电网后续绝缘配合的研究提供参考。
Safe operation of flexible DC distribution equipment is seriously affected by switching overvoltage, and it is of great significance to study the mechanism of its generation. Based on typical ±10 k V flexible DC distribution network, various types of faults, possibly occurring in AC side area, converter area and DC line area, are analyzed, including single-phase grounding, valve bottom grounding, valve top grounding, short-circuit fault between valve tops, bridge arm short-circuit, misoperation of DC circuit breaker, line monopole grounding and line bipolar short circuit. The generation mechanism of various switching overvoltages is studied in depth, and the maximum overvoltage level at key positions of the system and equipment is calculated based on system control and protection and configuration of surge arresters. The research results provide reference for follow-up insulation coordination of flexible DC distribution network..
Safe operation of flexible DC distribution equipment is seriously affected by switching overvoltage, and it is of great significance to study the mechanism of its generation. Based on typical ±10 k V flexible DC distribution network, various types of faults, possibly occurring in AC side area, converter area and DC line area, are analyzed, including single-phase grounding, valve bottom grounding, valve top grounding, short-circuit fault between valve tops, bridge arm short-circuit, misoperation of DC circuit breaker, line monopole grounding and line bipolar short circuit. The generation mechanism of various switching overvoltages is studied in depth, and the maximum overvoltage level at key positions of the system and equipment is calculated based on system control and protection and configuration of surge arresters. The research results provide reference for follow-up insulation coordination of flexible DC distribution network..
引文
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[9]马钊,焦在滨,李蕊.直流配电网络架构与关键技术[J].电网技术,2017,41(10):3348-3357.Ma Zhao,Jiao Zaibin,Li Rui.Network structures and key technologies of DC distribution systems[J].Power System Technology,2017,41(10):3348-3357(in Chinese).
[10]江道灼,郑欢.直流配电网研究现状与展望[J].电力系统自动化,2012,36(8):98-104.Jiang Daozhuo,Zheng Huan.Research status and developing prospect of DC distribution network[J].Automation of Electric Power Systems,2012,36(8):98-104(in Chinese).
[11]何秋萍,韩永霞,赵宇明,等.±10 k V直流配电系统过电压与绝缘配合[J].南方电网技术,2016,10(4):16-22.He Qiuping,Han Yongxia,Zhao Yuming,et al.Overvoltage and insulation coordination of±10 k V DC distribution system[J].Southern Power System Technology,2016,10(4):16-22(in Chinese).
[12]马焕,姚为正,吴金龙,等.含桥臂阻尼的MMC-HVDC直流双极短路故障机理分析[J].电网技术,2017,41(7):2099-2106.Ma Huan,Yao Weizheng,Wu Jinlong,et al.Analysis of DC pole-to-pole short circuit fault behavior in MMC-HVDC transmission systems with bridge arm damper[J].Power System Technology,2017,41(7):2099-2106(in Chinese).
[13]王峰,刘天琪,丁媛媛,等.直流闭锁引起的暂态过电压计算方法及其影响因素分析[J].电网技术,2016,40(10):3059-3065.Wang Feng,Liu Tianqi,Ding Yuanyuan,et al.Calculation method and influencing factors of transient overvoltage caused by HVDC block[J].Power System Technology,2016,40(10):3059-3065(in Chinese).
[14]罗永捷,徐罗那,熊小伏,等.MMC-MTDC系统直流单极对地短路故障保护策略[J].电工技术学报,2017,32(s1):98-106.Luo Yongjie,Xu Luona,Xiong Xiaofu,et al.Pole-to-ground DC fault protection of MMC-MTDC systems[J].Transactions of China Electrotechnical Society,2017,32(s1):98-106(in Chinese).
[15]Cui S,Kim S,Jung J J,et al.Principle,control and comparison of modular multilevel converters(MMCs)with DC short circuit fault ride-through capability[C]//IEEE Applied Power Electronics Conference and Exposition-Apec.Fort Worth,TX:IEEE,2014:610-616.
[16]时伯年,赵宇明,孙刚.柔性直流配电网保护方案研究及实现[J].南方电网技术,2015,9(9):11-16.Shi Bonian,Zhao Yuming,Sun Gang.Research and implementation of protection scheme for MMC DC distribution network[J].Southern Power System Technology,2015,9(9):11-16(in Chinese).
[17]胡竞竞,徐习东,裘鹏,等.直流配电系统保护技术研究综述[J].电网技术,2014,38(4):844-851.Hu Jingjing,Xu Xidong,Qiu Peng,et al.A review of the protection methods in DC distribution system[J].Power System Technology,2014,38(4):844-851(in Chinese).
[2]Emhemed A A S,Burt G M.An advanced protection scheme for enabling an LVDC last mile distribution network[J].IEEE Transactions on Smart Grid,2017,5(5):2602-2609.
[3]戴志辉,葛红波,严思齐,等.柔性直流配电网接地方式对故障特性的影响分析[J].电网技术,2017,41(7):2353-2362.Dai Zhihui,Ge Hongbo,Yan Siqi,et al.Effects of grounding mode on fault characteristics in flexible DC distribution system[J].Power System Technology,2017,41(7):2353-2362(in Chinese).
[4]Carminati M,Ragaini E,Tironi E.DC and AC ground fault analysis in LVDC microgrids with energy storage systems[C]//Environment and Electrical Engineering(EEEIC).Rome,Italy:IEEE,2015:1047-1054.
[5]Carminati M,Ragaini E.Considerations on DC side grounding configurations of LVDC microgrids[C]//International Youth Conference on Energy.Pisa,Italy:IEEE,2015:1-6.
[6]吴峻,武迪,朱金大,等.多端柔性直流配电网接地方式设计[J].中国电机工程学报,2017,37(9):2551-2560.Wu Jun,Wu Di,Zhu Jinda,et al.Grounding method design of multi-terminal flexible DC distribution[J].Proceedings of the CSEE,2017,37(9):2551-2560(in Chinese).
[7]于亚男,金阳忻,江全元,等.基于RT-LAB的柔性直流配电网建模与仿真分析[J].电力系统保护与控制,2015,43(19):125-130.Yu Yanan,Jin Yangxin,Jiang Quanyuan,et al.RT-LAB based modeling and simulation analysis of flexible DC distribution network[J].Power System Protection and Control,2015,43(19):125-130(in Chinese).
[8]杨英,董舒怡,陈红坤,等.三种主接线方式下柔性直流输电系统换流站内部过电压仿真[J].南方电网技术,2015,9(7):2-10.Yang Ying,Dong Shuyi,Chen Hongkun,et al.Inner overvoltage simulation of converter station of MMC-HVDC system in three kinds of main wiring modes[J].Southern Power System Technology,2015,9(7):2-10(in Chinese).
[9]马钊,焦在滨,李蕊.直流配电网络架构与关键技术[J].电网技术,2017,41(10):3348-3357.Ma Zhao,Jiao Zaibin,Li Rui.Network structures and key technologies of DC distribution systems[J].Power System Technology,2017,41(10):3348-3357(in Chinese).
[10]江道灼,郑欢.直流配电网研究现状与展望[J].电力系统自动化,2012,36(8):98-104.Jiang Daozhuo,Zheng Huan.Research status and developing prospect of DC distribution network[J].Automation of Electric Power Systems,2012,36(8):98-104(in Chinese).
[11]何秋萍,韩永霞,赵宇明,等.±10 k V直流配电系统过电压与绝缘配合[J].南方电网技术,2016,10(4):16-22.He Qiuping,Han Yongxia,Zhao Yuming,et al.Overvoltage and insulation coordination of±10 k V DC distribution system[J].Southern Power System Technology,2016,10(4):16-22(in Chinese).
[12]马焕,姚为正,吴金龙,等.含桥臂阻尼的MMC-HVDC直流双极短路故障机理分析[J].电网技术,2017,41(7):2099-2106.Ma Huan,Yao Weizheng,Wu Jinlong,et al.Analysis of DC pole-to-pole short circuit fault behavior in MMC-HVDC transmission systems with bridge arm damper[J].Power System Technology,2017,41(7):2099-2106(in Chinese).
[13]王峰,刘天琪,丁媛媛,等.直流闭锁引起的暂态过电压计算方法及其影响因素分析[J].电网技术,2016,40(10):3059-3065.Wang Feng,Liu Tianqi,Ding Yuanyuan,et al.Calculation method and influencing factors of transient overvoltage caused by HVDC block[J].Power System Technology,2016,40(10):3059-3065(in Chinese).
[14]罗永捷,徐罗那,熊小伏,等.MMC-MTDC系统直流单极对地短路故障保护策略[J].电工技术学报,2017,32(s1):98-106.Luo Yongjie,Xu Luona,Xiong Xiaofu,et al.Pole-to-ground DC fault protection of MMC-MTDC systems[J].Transactions of China Electrotechnical Society,2017,32(s1):98-106(in Chinese).
[15]Cui S,Kim S,Jung J J,et al.Principle,control and comparison of modular multilevel converters(MMCs)with DC short circuit fault ride-through capability[C]//IEEE Applied Power Electronics Conference and Exposition-Apec.Fort Worth,TX:IEEE,2014:610-616.
[16]时伯年,赵宇明,孙刚.柔性直流配电网保护方案研究及实现[J].南方电网技术,2015,9(9):11-16.Shi Bonian,Zhao Yuming,Sun Gang.Research and implementation of protection scheme for MMC DC distribution network[J].Southern Power System Technology,2015,9(9):11-16(in Chinese).
[17]胡竞竞,徐习东,裘鹏,等.直流配电系统保护技术研究综述[J].电网技术,2014,38(4):844-851.Hu Jingjing,Xu Xidong,Qiu Peng,et al.A review of the protection methods in DC distribution system[J].Power System Technology,2014,38(4):844-851(in Chinese).