含风电的VSC-HVDC并网系统暂态特性分析
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摘要
为了提高柔性直流输电(VSC-HVDC)并网系统的暂态稳定运行特性,文中基于送端采用双馈风电机组(DFIG),建立VSC-HVDC输电并网系统,研究该系统的并网暂态运行特性。为解决电网故障时并网VSCHVDC直流电压失稳问题,提出并网VSC-HVDC直流电压与VSC间协调控制策略。在MATLAB/Simulink平台搭建风电并网仿真模型,仿真分析风速变化、并网点故障等情况下系统的暂态特性以及并网点故障时是否采用新控制策略进行实验仿真对比,研究结果表明:风速变化以及并网点故障时并网系统能够快速恢复稳定性且采用的协调控制策略有效的抑制直流电压的突增,从而增强了系统的暂态稳定特性。
In order to improve the transient stability characteristics of the flexible HVDC (VSC-HVDC) connectedgrid system, in this paper, based on the adoption of doubly-fed induction generator (DFIG), a flexible HVDC (VSC-HVDC) grid-connected system is established to study transient operational performances. In order to solve the problem of VSC-HVDC voltage instability of grid-connected VSC-HVDC in Fault, the coordinated control strategy between VSC-HVDC DC voltage and VSC is proposed. The wind power grid-connected simulation model is established based on MATLAB/Simulink platform, the transient stability characteristics of the system under the case of the wind speed changes and power network fault are simulated and analyzed, and whether or not to adopt new control strategy for experimental simulation comparison. The results show that when the wind speed changes and the grid fault, the grid-connected system can recover quickly and the coordinated control strategy can effectively suppress the sudden increase of DC voltage, thus enhancing the transient stability of the system.
In order to improve the transient stability characteristics of the flexible HVDC (VSC-HVDC) connectedgrid system, in this paper, based on the adoption of doubly-fed induction generator (DFIG), a flexible HVDC (VSC-HVDC) grid-connected system is established to study transient operational performances. In order to solve the problem of VSC-HVDC voltage instability of grid-connected VSC-HVDC in Fault, the coordinated control strategy between VSC-HVDC DC voltage and VSC is proposed. The wind power grid-connected simulation model is established based on MATLAB/Simulink platform, the transient stability characteristics of the system under the case of the wind speed changes and power network fault are simulated and analyzed, and whether or not to adopt new control strategy for experimental simulation comparison. The results show that when the wind speed changes and the grid fault, the grid-connected system can recover quickly and the coordinated control strategy can effectively suppress the sudden increase of DC voltage, thus enhancing the transient stability of the system.
引文
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[17]杨涛,刘国平,黄淼,等.双馈风电场柔性高压直流输电并网控制策略[J].重庆大学学报,2015,38(1):1-11.YANG Tao,LIU Guoping,HUANG Miao,et al.A new control design for grid integration of DFIG wind farm with VSC-HVDC[J].Journal of Chongqing University,2015,38(1):1-11.
[18]王凯.基于PSCAD/EMDTC的双馈风力发电机的控制策略研究[D].北京:华北电力大学,2015.WANG Kai.Research on control system for doubly-fed wind generation based on PSCAD/EMDTC[D].Beijing:North China Electric power University,2015.
[19]HEIER S.Grid integration of wind energy:Onshore and offshore conversion systems[M].New York:John Wiley&Sons,2014.
[20]XU Lie,YAO Liangzhong,CHRISTIAN S.Grid integration of large DFIG-based wind arms using VSC Transactions[J].IEEE Transaction on Power Systems,2007,22(3):976-984.
[21]廖勇,王国栋.双馈风电场的柔性高压直流输电系统控制[J].中国电机工程学报,2012,32(28):7-15.LIAO Yong,WANG Guodong.VSC-HVDC system control for Grid-connection of DIFG wind farms[J].Proceedings of the chinese Society for Electrical Engineering,2012,32(28):7-15.
[22]AMIRNASER Y,REZA I.Voltage-sourced converters in power systems,control,and applications[M].Hoboken,NewJersey,USA:IEEE Press,2009.
[2]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.
[3]崔福博,郭剑波,荆平,等.直流配电技术综述[J].电网技术,2014,38(3):556-564.CUI Fubo,GUO Jianbo,JING Ping,et al.A review of DCpower distribution technology[J].Power System Technology,2014,38(3):556-564.
[4]李俊峰.中国风电发展报告[M].北京:中国环境科学出版社,2012.LI Junfeng.China wind development report[M].Beijing:China Enviromental Science Press,2012.
[5]LU Zongxiang,YE Xi,QIAO Ying,et al.Initial exploration of wind farm cluster hierarchical coordinated dispatch based on virtual power generator concept[J].CSEE Journal of Power and Energy Systems,2015,1(2):62-67.
[6]王成山,罗凤章,张天宇,等.城市电网智能化关键技术[J].高电压技术,2016,42(7):2017-2027.WANG Chengshan,LUO Fengzhang,ZHANG Tianyu,et al.Review on key technologies of smart urban power network[J].High Voltage Engineering,2016,42(7):2017-2027.
[7]马为民,吴方劼,杨一鸣,等.柔性直流输电技术的现状及应用前景分析[J].高电压技术,2014,40(8):2429-2439.MA Weimin,WU Fangjie,YANG Yiming,et al.Flexible HVDC transmission technology’s Today and tomorrow[J].High Voltage Engineering,2014,40(8):2429-2439.
[8]饶宏,张东辉,赵晓斌,等.特高压直流输电的实践和分析[J].高电压技术,2015,41(8):2481-2488.RAO Hong,ZHANG Donghui,ZHAO Xiaobin,et al.Practice and analyses of UHVDC power transmission[J].High Voltage Engineering,2015,41(8):2481-2488.
[9]吴寒,王维庆,王海云,等.基于柔性直流输电技术的风电场暂态稳定性[J].中国电力,2014,47(12):99-104.WU Han,WANG Weiqing,WANG Haiyun,et al.Study on transient stability of VSC-HVDC-based wind farm[J].Electric Power,2014,47(12):99-104.
[10]王锡凡,卫晓辉,宁联辉,等.海上风电并网与输送方案比较[J].中国电机工程学报,2014,34(31):5459-5466.WANG Xifan,WEI Xiaohui,NING Lianhui,et al.Integration techniques and transmission schemes for offshore wind farms[J].Proceedings of the CSEE,2014,34(31):5459-5466.
[11]CHOU C J,WU Yuankang,HAN G Y,et al.Comparative evaluation of the HVDC and HVAC links integrated in a large offshore wind farm-an actual case study in Taiwan[J].IEEE Transactions on Industry Applications,2012,48(5):1639-1648.
[12]田新首,王伟胜,迟永宁,等.双馈风电机组故障行为及对电力系统暂态稳定性的影响[J].电力系统自动化,2015,39(10):16-21.TIAN Xinshou,WANG Weisheng,CHI Yongning,et al.Performances of DFIG-based wind turbines during system fault and its impacts on transient stability of power systems[J].Automation of Electric Power Systems,2015,39(10):16-21.
[13]李东东,梁自超,周玉琦.含风电场的受端系统暂态电压稳定性评估[J].电力系统保护与控制,2015,43(13):8-14.LI Dongdong,LIANG Zichao,ZHOU Yuqi.Transient voltage stability assessment of receiving end grid incorporating with wind farm[J].Power System Protection and Control,2015,43(13):8-14.
[14]孙溧.双馈式异步风力发电机发电过程的建模与仿真研究[D].重庆:重庆大学,2016.SUN Li.Modeling and simulation of doubly-fed induction wind power system[D].Chongqing:Chongqing University,2016.
[15]陈振新.基于数学解析方法的双馈感应发电机组暂态特性研究[D].北京:华北电力大学,2016.CHEN Zhenxin.Transient characteristics of double-fed induction generator by mathematical analysis method[D].Beijing:North China Electric Power University,2016.
[16]罗煦之,易俊,张健,等.结合DFIG功率特性研究风电并网对系统功角稳定性的影响[J].电网技术,2015,39(12):3401-3407.LUO Xuzhi,YI Jun,ZHANG Jian,et al.Research on influence of integrated wind plants on power angle stability based on output characteristic of DFIG[J].Power System Technology,2015,39(12):3401-3407.
[17]杨涛,刘国平,黄淼,等.双馈风电场柔性高压直流输电并网控制策略[J].重庆大学学报,2015,38(1):1-11.YANG Tao,LIU Guoping,HUANG Miao,et al.A new control design for grid integration of DFIG wind farm with VSC-HVDC[J].Journal of Chongqing University,2015,38(1):1-11.
[18]王凯.基于PSCAD/EMDTC的双馈风力发电机的控制策略研究[D].北京:华北电力大学,2015.WANG Kai.Research on control system for doubly-fed wind generation based on PSCAD/EMDTC[D].Beijing:North China Electric power University,2015.
[19]HEIER S.Grid integration of wind energy:Onshore and offshore conversion systems[M].New York:John Wiley&Sons,2014.
[20]XU Lie,YAO Liangzhong,CHRISTIAN S.Grid integration of large DFIG-based wind arms using VSC Transactions[J].IEEE Transaction on Power Systems,2007,22(3):976-984.
[21]廖勇,王国栋.双馈风电场的柔性高压直流输电系统控制[J].中国电机工程学报,2012,32(28):7-15.LIAO Yong,WANG Guodong.VSC-HVDC system control for Grid-connection of DIFG wind farms[J].Proceedings of the chinese Society for Electrical Engineering,2012,32(28):7-15.
[22]AMIRNASER Y,REZA I.Voltage-sourced converters in power systems,control,and applications[M].Hoboken,NewJersey,USA:IEEE Press,2009.