提升无源工业负荷故障穿越能力的VSC-HVDC控制策略
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摘要
由于无源工业负荷对于电压变化很敏感,因此保证电压稳定是提升其故障穿越能力的关键,首先分析了在故障下,影响无源系统交流电压的主要因素,并在此基础上,提出了一种改进的电压源换流器(VSC)控制策略。这种控制策略由两部分组成:1改进了VSC外环控制器的限幅策略;2提出了一种基于受端交流电压测量的频率滞回控制。通过PSCAD/EMTDC仿真进行验证分析,结果表明该控制方法能有效地帮助无源工业负荷穿越故障,实现稳定运行。
Since industrial installations are much more sensitive to voltage drops than frequency deviations,it is essential to guarantee the stability of voltage during severe faults.First,the main factor that affects the AC voltage in the passive system is analyzed.According to the analytical results,the control strategy is proposed to increase the AC voltage in transient conditions.The strategy consists of two parts,i.e.,a modified current limit tactic and a frequency hysteresis control.The simulation tests uring metallic single-phase and three-phase faults are done via PSCAD/EMTDC to verify the validity of the control methods.
Since industrial installations are much more sensitive to voltage drops than frequency deviations,it is essential to guarantee the stability of voltage during severe faults.First,the main factor that affects the AC voltage in the passive system is analyzed.According to the analytical results,the control strategy is proposed to increase the AC voltage in transient conditions.The strategy consists of two parts,i.e.,a modified current limit tactic and a frequency hysteresis control.The simulation tests uring metallic single-phase and three-phase faults are done via PSCAD/EMTDC to verify the validity of the control methods.
引文
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[21]刘昇,徐政,唐庚,等.MMC-HVDC联网及孤岛运行状态转换策略[J].中国电机工程学报,2015,35(9):2152-2161.LIU Sheng,XU Zheng,TANG Geng,et al.The strategies of the MCC-HVDC for the transition of networking and islanding state[J].Proceedings of the CSEE,2015,35(9):2152-2161.
[22]GUAN Minyuan,PAN Wulue,ZHANG Jiang,et al.Synchronous generator emulation control strategy for voltage source converter(VSC)stations[J].IEEE Trans on Power Systems,2015,30(6):3093-3101.
[23]KUNDER P.Power system stability and control[M].New York:McGraw-Hill,1994:647-658.
[24]HE L,LIU C C.Parameter identification with PMUs for instability detection in power systems with HVDC integrated offshore wind energy[J].IEEE Trans on Power Systems,2014,29(2):775-784.
[25]郑超,马世英,盛灿辉,等.以直流逆变站为动态无功源的暂态电压稳定控制[J].中国电机工程学报,2014,34(34):6141-6149.ZHENG Chao,MA Shiying,SHENG Canhui,et al.A transient voltage stability control using the DC inverter station as a dynamic reactive power source[J].Proceedings of the CSEE,2014,34(34):6141-6149.
[2]KIM T O,JU H D,KANG G H.Analysis of power system harmonics for an offshore design with VTB dynamic model[C]//IEEE Vehicle Power and Propulsion Conference,October9-12,2012,Seoul,Korea:529-531.
[3]MCGRANAGHAN M F,MUELLER D R,SAMOTYJ M J,et al.Voltage sags in industrial systems[J].IEEE Trans on Industry Applications,1993,29(2):397-403.
[4]DAVIS T,BEAM G E,MELHORN C J.Voltage sags:their impact on the utility and industrial customers[J].IEEE Trans on Industry Applications,1998,34(3):549-558.
[5]BECKER C,JR BRAUN W,CARRICK K,et al.Proposed chapter 9for predicting voltage sags(dips)in revision to IEEE Std 493,the Gold Book[J].IEEE Trans on Industry Applications,1994,30(3):805-821.
[6]DU C,BOLLEN M H J,AGNEHOLM E,et al.A new control strategy of a VSC-HVDC system for high-quality supply of industrial plants[J].IEEE Trans on Power Delivery,2007,22(4):2386-2394.
[7]顾益磊,唐庚,黄晓明,等.含多端柔性直流输电系统的交直流电网动态特性分析[J].电力系统自动化,2013,37(15):27-34.GU Yilei,TANG Geng,HUANG Xiaoming,et al.Dynamic characteristic analysis of hybrid AC/DC power grid with multiterminal HVDC based on modular multilevel converter[J].Automation of Electric Power Systems,2013,37(15):27-34.
[8]管敏渊,徐政,屠卿瑞,等.模块化多电平换流器型直流输电的调制策略[J].电力系统自动化,2010,34(2):48-52.GUAN Minyuan,XU Zheng,TU Qingrui,et al.Nearest level modulation for modular multilevel converters in HVDC transmission[J].Automation of Electric Power Systems,2010,34(2):48-52.
[9]朱瑞可,王渝红,李兴源,等.VSC-MTDC系统直流电压自适应斜率控制策略[J].电力系统自动化,2015,39(4):63-68.DOI:10.7500/AEPS20131010007.ZHU Ruike,WANG Yuhong,LI Xingyuan,et al.The adaptive DC voltage droop control strategy of VSC-MTDC system[J].Automation of Electric Power Systems,2015,39(4):63-68.DOI:10.7500/AEPS20131010007.
[10]徐政.柔性直流输电系统[M].北京:机械工业出版社,2012.
[11]FELTES C,WREDE H,KOCH F W,et al.Enhanced fault ride-through method for wind farms connected to the grid through VSC-based HVDC transmission[J].IEEE Trans on Power Systems,2009,24(3):1537-1546.
[12]陈海荣,徐政.向无源网络供电的VSC-HVDC系统的控制器设计[J].中国电机工程学报,2006,26(23):42-48.CHEN Hairong,XU Zheng.Control design for VSC-HVDC supplying passive network[J].Proceedings of the CSEE,2006,26(23):42-48.
[13]孟永庆,李宦,刘杰,等.柔性直流输电系统含有积分稳定环节的无源控制系统设计[J].电力系统自动化,2014,38(23):77-84.DOI:10.7500/AEPS20140309004.MENG Yongqing,LI Huan,LIU Jie,et al.The design of the passive control system for the flexible HVDC system with the stable integral parts[J].Automation of Electric Power Systems,2014,38(23):77-84.DOI:10.7500/AEPS20140309004.
[14]郭春义,赵成勇,王晶.新型双馈入直流输电系统供电无源网络的运行特性研究[J].电工技术学报,2012,27(11):211-218.GUO Chunyi,ZHAO Chengyong,WANG Jing.Operation characteristic research on novel double-infeed HVDC system supplying passive network[J].Transactions of China Electrotechnical Society,2012,27(11):211-218.
[15]管敏渊,徐政.向无源网络供电的MMC型直流输电系统建模与控制[J].电工技术学报,2013,28(2):255-263.GUAN Minyuan,XU Zheng.Modeling and control of modular multilevel converter based VSC-HVDC system connected to passive networks[J].Transactions of China Electrotechnical Society,2013,28(2):255-263.
[16]DU C,AGNEHOLM E,OLSSON G.Comparison of different frequency controllers for a VSC-HVDC supplied system[J].IEEE Trans on Power Delivery,2008,23(4):2224-2232.
[17]HE W,UHLEN K,HADIYA M,et al.Case study of integrating an offshore wind farm with offshore oil and gas platforms and with an onshore electrical grid[R].2013.
[18]LIU Bing,XU Jia,TORRES-OLGUIN R E,et al.Faults mitigation control design for grid integration of offshore wind farms and oil&gas installations using VSC HVDC[C]//2010International Symposium on Power Electronics Electrical Drives Automation and Motion,June 14-16,2010,Pisa,Italy:792-797.
[19]HAILESELASSIE T M,MOLINAS M,UNDELAND T,et al.Multi-terminal VSC-HVDC system for integration of offshore wind farms and green electrification of platforms in the North Sea[D].Finland:Helsinki University of Technology,2008.
[20]杨冬儿,滕本科.向无源网络供电的VSC-HVDC电压下陷问题研究[J].电力学报,2013(1):22-27.YANG Donger,TENG Benke.Study on voltage sag of VSCHVDC supplying for passive network[J].Journal of Electric Power,2013(1):22-27.
[21]刘昇,徐政,唐庚,等.MMC-HVDC联网及孤岛运行状态转换策略[J].中国电机工程学报,2015,35(9):2152-2161.LIU Sheng,XU Zheng,TANG Geng,et al.The strategies of the MCC-HVDC for the transition of networking and islanding state[J].Proceedings of the CSEE,2015,35(9):2152-2161.
[22]GUAN Minyuan,PAN Wulue,ZHANG Jiang,et al.Synchronous generator emulation control strategy for voltage source converter(VSC)stations[J].IEEE Trans on Power Systems,2015,30(6):3093-3101.
[23]KUNDER P.Power system stability and control[M].New York:McGraw-Hill,1994:647-658.
[24]HE L,LIU C C.Parameter identification with PMUs for instability detection in power systems with HVDC integrated offshore wind energy[J].IEEE Trans on Power Systems,2014,29(2):775-784.
[25]郑超,马世英,盛灿辉,等.以直流逆变站为动态无功源的暂态电压稳定控制[J].中国电机工程学报,2014,34(34):6141-6149.ZHENG Chao,MA Shiying,SHENG Canhui,et al.A transient voltage stability control using the DC inverter station as a dynamic reactive power source[J].Proceedings of the CSEE,2014,34(34):6141-6149.