柔性直流输电提升常规直流输电短路比的原理及方法
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摘要
柔性直流输电(VSC-HVDC)馈入受端交流电网后对原有常规直流(LCC-HVDC)将产生重要影响。基于含VSCHVDC和LCC-HVDC的混合双馈入直流系统,分析了计及VSC-HVDC影响多馈入有效短路比指标,量化了VSCHVDC馈入点及馈入电流对LCC-HVDC有效短路比的提升作用。结合VSC-HVDC稳态运行目标及LCC-HVDC的暂态电压支撑需求,设计了一种可最大程度提高多馈入有效短路比的VSC-HVDC控制策略,通过PSCAD中的数字仿真验证了该策略的有效性。
VSC-HVDC has significant influence on LCC-HVDC in hybrid multi-infeed HVDC system. Based on a hybrid dual-infeed HVDC system,the multi-infeed effective short circuit ratio( MIESCR) is deduced which quantitates the improvement effect of infeed point and infeed current of VSC-HVDC to LCC-HVDC. Considering both the normal operation target of VSC-HVDC and the transient voltage compensation needed by LCC-HVDC,a control strategy of VSC-HVDC is proposed which can achieve maximum MIESCR,and its effectiveness is verified through digital simulation in PSCAD.
VSC-HVDC has significant influence on LCC-HVDC in hybrid multi-infeed HVDC system. Based on a hybrid dual-infeed HVDC system,the multi-infeed effective short circuit ratio( MIESCR) is deduced which quantitates the improvement effect of infeed point and infeed current of VSC-HVDC to LCC-HVDC. Considering both the normal operation target of VSC-HVDC and the transient voltage compensation needed by LCC-HVDC,a control strategy of VSC-HVDC is proposed which can achieve maximum MIESCR,and its effectiveness is verified through digital simulation in PSCAD.
引文
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[15]倪晓军,赵成勇,郭春义,等.混合双馈入直流系统中VSC-HVDC对LCC-HVDC受端系统强度的影响[J].中国电机工程学报,2015,35(16):4052-4061.NI Xiaojun,ZHAO Chengyong,GUO Chunyi,et al.The effects of VSC-HVDC on the system strength of LCC-HVDC in dual-infeed hybrid HVDC system[J].Proceedings of the CSEE,2015,35(16):4052-4061.
[16]郭春义,倪晓军,赵成勇.混合多馈入直流输电系统相互作用关系的定量评估方法[J].中国电机工程学报,2016,36(7):1772-1780.GUO Chunyi,NI Xiaojun,ZHAO Chengyong.A quantitative evaluation method on interaction analysis of hybrid multi-infeed HVDC system[J].Proceedings of the CSEE,2016,36(7):1772-1780.
[17]LIU Y,CHEN Z.A flexible power control method of VSCHVDC link for the enhancement of effective short-circuit ratio in a hybrid multi-infeed HVDC system[J].IEEE Transactions on Pow er Systems,2013,28(2):1568-1581.
[2]OOI B T,WANG X.Voltage angle lock loop control of the boost type PWM converter for HVDC application[J].IEEE Transactions on Pow er Delivery,1990,5(2):229-235.
[3]徐政.柔性直流输电系统[M].北京:机械工业出版社,2013:7-10.
[4]徐政,陈海荣.电压源换流器型直流输电技术综述[J].高电压技术,2007,33(1):1-10.XU Zheng,CHEN Hairong.Review and applications of VSC HVDC[J].High Voltage Engineering,2007,33(1):1-10.
[5]赵成勇,李金丰,李广凯.基于有功和无功独立调节的VSC-HVDC控制策略[J].电力系统自动化,2005,29(9):20-24.ZHAO Chengyong,LI Jinfeng,LI Guangkai.VSC-HVDC control strategy based on respective adjustment of active and reactive pow er[J].Automation of Pow er Systems,2005,29(9):20-24.
[6]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 pow er netw ork[J].Proceedings of CSEE,2013,33(25):9-19.
[7]ITO Y,YANG Zhongqing,AKAGI H.DC micro-grid based distribution pow er generation system[C]//2004 4th International Pow er Electronics and Motion Control Conference,August 14-16,2004,Xi'an,China.New York:IEEE,2004:1740-1745.
[8]徐政.交直流电力系统动态行为分析[M].北京:机械工业出版社,2004.
[9]KRISHAYYA P,ADAPA R,HOLM M.IEEE guide for planning DC links terminating at AC locations having low short-circuit capacities,part I:AC/DC system interaction phenomena[R].France:CIGRE,1997.
[10]DE TOLEDO P F,BERGDAHL B,ASPLUND G.Multiple infeed short circuit ratio-aspects related to multiple HVDC into one AC netw ork[C]//IEEE Transmission and Distribution Conference and Exhibition:Asia and Pacific,August 18,2005,Dalian,China.New York:IEEE,2005:1-6.
[11]洪潮,饶宏.多馈入直流系统的量化分析指标及其应用[J].南方电网技术,2008,2(4):37-41.HONG Chao,RAO Hong.The index parameters for analyzing multi-infeed HVDC system and their applications[J].Southern Pow er System Technology,2008,2(4):37-41.
[12]黄弘扬,徐政,许烽.多馈入直流输电系统短路比指标的有效性分析[J].电力自动化设备,2012,32(11):46-50.HUANG Hongyang,XU Zheng,XU Feng.Effectiveness of short ratio index for multi-infeed HVDC system[J].Electric Pow er Automation Equipment,2012,32(11):46-50.
[13]郭小江,汤涌,郭强,等.CIGRE多馈入直流短路比指标影响因素及机理[J].电力系统保护与控制,2012,40(9):69-74.GUO Xiaojiang,TANG Yong,GUO Qiang,et al.Influence factors and theory for CIGRE M ISCR index[J].Pow er System Protection and Control,2012,40(9):69-74.
[14]雷晟.多直流馈入受端电网电压支撑能力评价指标研究[D].广州:华南理工大学,2015.
[15]倪晓军,赵成勇,郭春义,等.混合双馈入直流系统中VSC-HVDC对LCC-HVDC受端系统强度的影响[J].中国电机工程学报,2015,35(16):4052-4061.NI Xiaojun,ZHAO Chengyong,GUO Chunyi,et al.The effects of VSC-HVDC on the system strength of LCC-HVDC in dual-infeed hybrid HVDC system[J].Proceedings of the CSEE,2015,35(16):4052-4061.
[16]郭春义,倪晓军,赵成勇.混合多馈入直流输电系统相互作用关系的定量评估方法[J].中国电机工程学报,2016,36(7):1772-1780.GUO Chunyi,NI Xiaojun,ZHAO Chengyong.A quantitative evaluation method on interaction analysis of hybrid multi-infeed HVDC system[J].Proceedings of the CSEE,2016,36(7):1772-1780.
[17]LIU Y,CHEN Z.A flexible power control method of VSCHVDC link for the enhancement of effective short-circuit ratio in a hybrid multi-infeed HVDC system[J].IEEE Transactions on Pow er Systems,2013,28(2):1568-1581.