基于电压源型换流器的柔性直流系统快速方向保护
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摘要
基于电压源型换流器的直流配电系统发生故障时,故障电流具有速度快、峰值大的特点,对保护速动性与可靠性要求高。针对典型环状直流配电系统,研究了保护正、反方向发生故障时的差异特征。在此基础上,提取直流侧并联电容电压与线路电流在保护正、反方向发生故障时的相关性特征,提出并设计了一种直流线路快速方向保护新原理。该原理具有动作速度快、选择性高、抗过渡电阻能力较强等特点。在PSCAD中搭建了四端环状直流配电系统,大量仿真算例验证了所提保护原理的可行性与优越性。
When faults occur in the VSC( Voltage Source Converter)-based DC distribution system,the fault currents have fast speed and high peak value,which require high quickness and reliability of protection. Aiming at the typical meshed VSC-based DC distribution system,the discriminative features between positive and reverse direction fault of protection are analyzed. On this basis,a new fast direction protection principle of DC lines is proposed,by extracting correlation characteristics of DC side parallel capacitor voltage and line current with the positive and reverse direction faults of protection. The principle has the characteristics of fast action speed,high selectivity and strong resistance to transition resistance. A four-terminal meshed DC distribution system is built in PSCAD,whose simulation examples verify the feasibility and superiority of the proposed protection principle.
When faults occur in the VSC( Voltage Source Converter)-based DC distribution system,the fault currents have fast speed and high peak value,which require high quickness and reliability of protection. Aiming at the typical meshed VSC-based DC distribution system,the discriminative features between positive and reverse direction fault of protection are analyzed. On this basis,a new fast direction protection principle of DC lines is proposed,by extracting correlation characteristics of DC side parallel capacitor voltage and line current with the positive and reverse direction faults of protection. The principle has the characteristics of fast action speed,high selectivity and strong resistance to transition resistance. A four-terminal meshed DC distribution system is built in PSCAD,whose simulation examples verify the feasibility and superiority of the proposed protection principle.
引文
[1]BARAN M E,MAHAJAN N R.DC distribution for industrial systems:opportunities and challenges[J].IEEE Transactions on Industry Applications,2003,39(6):1596-1601.
[2]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.
[3]宋强,赵彪,刘文华,等.智能直流配电网研究综述[J].中国电机工程学报,2013,33(25):9-19.SONG Qiang,ZHAO Biao,LIU Wenhua,et al.An overview of research on smart DC distribution power network[J].Proceedings of the CSEE,2013,33(25):9-19.
[4]李斌,何佳伟.柔性直流配电系统故障分析及限流方法[J].中国电机工程学报,2015,35(12):3026-3036.LI Bin,HE Jiawei.DC fault analysis and current limiting technique for VSC-based dc distribution[J].Proceedings of the CSEE,2015,35(12):3026-3036.
[5]董云龙,凌卫家,田杰,等.舟山多端柔性直流输电控制保护系统[J].电力自动化设备,2016,36(7):169-175.DONG Yunlong,LIN Weijia,TIAN Jie,et al.Control and protection system for Zhoushan multi-terminal VSC-HVDC[J].Electric Power Automation Equipment,2016,36(7):169-175.
[6]赵婉君.高压直流输电工程技术[M].北京:中国电力出版社,2011:30-149.
[7]ZHANG Y,TAI N,XU B.Fault analysis and traveling wave protection scheme for bipolar HVDC lines[J].IEEE Transactions on Power Delivery,2012,27(3):1583-1591.
[8]束洪春,田鑫萃,董俊,等.利用电压相关性的±800 k V直流输电线路区内外故障判断方法[J].中国电机工程学报,2012,32(4):151-160.SHU Hongchun,TIAN Xincui,DONG Jun,et al.Identification between internal and external faults of±800 k V HVDC transmission lines based on voltage correlation[J].Proceedings of the CSEE,2012,32(4):151-160.
[9]丁浩寅,邰能灵,郑晓冬.利用信号距离识别的高压直流输电线路保护方案[J].高电压技术,2011,37(5):1186-1193.DING Haoyin,TAI Nengling,ZHENG Xiaodong.HVDC transmission line protection method using signal distance[J].High Voltage Engineering,2011,37(5):1186-1193.
[10]李斌,何佳伟,李晔,等.基于边界特性的多端柔性直流配电系统单端量保护方案[J].中国电机工程学报,2016,36(21):5741-5749.LI Bin,HE Jiawei,LI Ye,et al.Single-ended protection scheme based on boundary characteristic for the multi-terminal VSC-based DC distribution system[J].Proceedings of the CSEE,2016,36(21):5741-5749.
[11]宋国兵,蔡新雷,高淑萍,等.基于模型识别的VSC-HVDC直流输电线路方向元件[J].电力系统保护与控制,2012,40(7):78-83.SONG Guobing,CAI Xinlei,GAO Shuping,et al.Directional element for VSC-HVDC transmission Lines based of model identification[J].Power System Protection and Control,2012,40(7):78-83.
[12]JIN X F,SONG G B,MA Z B.A novel pilot protection for VSCHVDC transmission lines based on parameter identification[C]∥12th IET International Conference on Development in Power System Protection.Copenhagen,Denmark:IET,2014:1-6.
[13]孙栩,王华伟,雷霄,等.架空线柔性直流电网的直流短路电流限制研究[J].电力自动化设备,2017,37(2):219-223.SUN Xu,WANG Huawei,LEI Xiao,et al.Restriction of DC short ciucuit current for overhead lines of flexible DC grid[J].Electric Power Automation Equipment,2017,37(2):219-223.
[14]JIN Y,FLETCHER J E,O'REILLY J,et al.Multiterminal DC wind farm collection grid internal fault analysis and protection design[J].IEEE Transactions on Power Delivery,2010,25(4):2308-2316.
[15]JIN Y,FLETCHER J E,O'REILLY J,et al.Short-circuit and ground fault annlyses and location in VSC-based DC network cables[J].IEEE Transactions on Industrial Electronics,2012,59(10):3827-3837.
[16]李斌,何佳伟.多端柔性直流电网故障隔离技术研究[J].中国电机工程学报,2016,36(1):87-95.LI Bin,HE Jiawei.Research on the fault isolating technique in multi-terminal DC system[J].Proceedings of the CSEE,2016,36(1):87-95.
[17]AHLGREN P,JARNEVING B,ROUSSEAU R.Requirements for a cocitation similarity measure with special reference to Pearson's correlation coefficient[J].Journal of the American Society for Information Science and Technology,2003,54(6):550-560.
[18]张朝龙,何怡刚,邓芳明,等.一种基于QPSO-RVM的模拟电路故障预测方法[J].仪器仪表学报,2014,35(8):1751-1757.ZHANG Chaolong,HE Yigang,DENG Fangming.An approach for analog circuit fault prognostics based on QPSO-RVM[J].Chinese Journal of Scientific Instrument,2014,35(8):1751-1757.
[2]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.
[3]宋强,赵彪,刘文华,等.智能直流配电网研究综述[J].中国电机工程学报,2013,33(25):9-19.SONG Qiang,ZHAO Biao,LIU Wenhua,et al.An overview of research on smart DC distribution power network[J].Proceedings of the CSEE,2013,33(25):9-19.
[4]李斌,何佳伟.柔性直流配电系统故障分析及限流方法[J].中国电机工程学报,2015,35(12):3026-3036.LI Bin,HE Jiawei.DC fault analysis and current limiting technique for VSC-based dc distribution[J].Proceedings of the CSEE,2015,35(12):3026-3036.
[5]董云龙,凌卫家,田杰,等.舟山多端柔性直流输电控制保护系统[J].电力自动化设备,2016,36(7):169-175.DONG Yunlong,LIN Weijia,TIAN Jie,et al.Control and protection system for Zhoushan multi-terminal VSC-HVDC[J].Electric Power Automation Equipment,2016,36(7):169-175.
[6]赵婉君.高压直流输电工程技术[M].北京:中国电力出版社,2011:30-149.
[7]ZHANG Y,TAI N,XU B.Fault analysis and traveling wave protection scheme for bipolar HVDC lines[J].IEEE Transactions on Power Delivery,2012,27(3):1583-1591.
[8]束洪春,田鑫萃,董俊,等.利用电压相关性的±800 k V直流输电线路区内外故障判断方法[J].中国电机工程学报,2012,32(4):151-160.SHU Hongchun,TIAN Xincui,DONG Jun,et al.Identification between internal and external faults of±800 k V HVDC transmission lines based on voltage correlation[J].Proceedings of the CSEE,2012,32(4):151-160.
[9]丁浩寅,邰能灵,郑晓冬.利用信号距离识别的高压直流输电线路保护方案[J].高电压技术,2011,37(5):1186-1193.DING Haoyin,TAI Nengling,ZHENG Xiaodong.HVDC transmission line protection method using signal distance[J].High Voltage Engineering,2011,37(5):1186-1193.
[10]李斌,何佳伟,李晔,等.基于边界特性的多端柔性直流配电系统单端量保护方案[J].中国电机工程学报,2016,36(21):5741-5749.LI Bin,HE Jiawei,LI Ye,et al.Single-ended protection scheme based on boundary characteristic for the multi-terminal VSC-based DC distribution system[J].Proceedings of the CSEE,2016,36(21):5741-5749.
[11]宋国兵,蔡新雷,高淑萍,等.基于模型识别的VSC-HVDC直流输电线路方向元件[J].电力系统保护与控制,2012,40(7):78-83.SONG Guobing,CAI Xinlei,GAO Shuping,et al.Directional element for VSC-HVDC transmission Lines based of model identification[J].Power System Protection and Control,2012,40(7):78-83.
[12]JIN X F,SONG G B,MA Z B.A novel pilot protection for VSCHVDC transmission lines based on parameter identification[C]∥12th IET International Conference on Development in Power System Protection.Copenhagen,Denmark:IET,2014:1-6.
[13]孙栩,王华伟,雷霄,等.架空线柔性直流电网的直流短路电流限制研究[J].电力自动化设备,2017,37(2):219-223.SUN Xu,WANG Huawei,LEI Xiao,et al.Restriction of DC short ciucuit current for overhead lines of flexible DC grid[J].Electric Power Automation Equipment,2017,37(2):219-223.
[14]JIN Y,FLETCHER J E,O'REILLY J,et al.Multiterminal DC wind farm collection grid internal fault analysis and protection design[J].IEEE Transactions on Power Delivery,2010,25(4):2308-2316.
[15]JIN Y,FLETCHER J E,O'REILLY J,et al.Short-circuit and ground fault annlyses and location in VSC-based DC network cables[J].IEEE Transactions on Industrial Electronics,2012,59(10):3827-3837.
[16]李斌,何佳伟.多端柔性直流电网故障隔离技术研究[J].中国电机工程学报,2016,36(1):87-95.LI Bin,HE Jiawei.Research on the fault isolating technique in multi-terminal DC system[J].Proceedings of the CSEE,2016,36(1):87-95.
[17]AHLGREN P,JARNEVING B,ROUSSEAU R.Requirements for a cocitation similarity measure with special reference to Pearson's correlation coefficient[J].Journal of the American Society for Information Science and Technology,2003,54(6):550-560.
[18]张朝龙,何怡刚,邓芳明,等.一种基于QPSO-RVM的模拟电路故障预测方法[J].仪器仪表学报,2014,35(8):1751-1757.ZHANG Chaolong,HE Yigang,DENG Fangming.An approach for analog circuit fault prognostics based on QPSO-RVM[J].Chinese Journal of Scientific Instrument,2014,35(8):1751-1757.