海上风电经混合直流并网的控制策略
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摘要
海上风电经混合高压直流输电系统并网,能有效融合传统高压直流及柔性直流输电系统的优点,具有广泛应用前景.分析整个系统的拓扑结构、推导相关数学模型,提出改进的协调控制策略.在PSCAD/EMTDC软件中构建相应模型,分析风速波动条件下风电场的风速跟踪性能、逆变侧故障状态下采用不同控制策略时系统的暂态特性.仿真结果表明:风电场输出的有功功率、无功功率能随风速的波动而变化,系统具有良好的风速跟踪能力;改进的控制策略能有效提升系统直流电压的稳定性、抑制有功功率的波动、降低故障带来的冲击、加快恢复系统的稳定状态,适用于海上风电并网.
Offshore wind power transmitted via hybrid HVDC can effectively integrate the advantages of LCC-HVDC and VSC-HVDC,and has wide application prospects.The topological structure of the whole system was analyzed,the relevant mathematical models were deduced,and the improved coordinated control strategy was put forward.The corresponding model was built in the PSCAD/EMTDC software,and the wind speed tracking ability of wind farm under the wind speed fluctuation and the transient characteristic of the system using different control strategies under the condition of the inverter side failure were analyzed.The simulation results showed that the active power and reactive power of the wind farm output could change with the fluctuation of wind speed,and the system had good wind speed tracking ability.The improved control strategy could effectively improve the DC voltage stability,suppress the fluctuation of active power,reduce the impact of the fault,and accelerate system stability.It was suitable for offshore wind power grid connection.
Offshore wind power transmitted via hybrid HVDC can effectively integrate the advantages of LCC-HVDC and VSC-HVDC,and has wide application prospects.The topological structure of the whole system was analyzed,the relevant mathematical models were deduced,and the improved coordinated control strategy was put forward.The corresponding model was built in the PSCAD/EMTDC software,and the wind speed tracking ability of wind farm under the wind speed fluctuation and the transient characteristic of the system using different control strategies under the condition of the inverter side failure were analyzed.The simulation results showed that the active power and reactive power of the wind farm output could change with the fluctuation of wind speed,and the system had good wind speed tracking ability.The improved control strategy could effectively improve the DC voltage stability,suppress the fluctuation of active power,reduce the impact of the fault,and accelerate system stability.It was suitable for offshore wind power grid connection.
引文
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[2]郑晓坤.海上风电场组网与大容量变流器实现形式对比研究[J].电力电容器与无功补偿,2016,37(2):95-104.
[3]LIN W X,WEN J Y,CHENG S J,et al.A three-terminal HVDC system to bundle wind farms with conventional power plants[J].IEEE Transactions on Power Systems,2013,28(3):2292-2300.
[4]BOZHKO S V,BLASCO-GIMENEZ R,LI R,et al,Control of offshore DFIG-based wind farm grid with line-commutated HVDC connection[J].IEEE Transactions on Energy Conversion,2007,22(1):71-78.
[5]XU L,YAO L,SASSE C.Grid integration of large DFIG-based wind farms using VSC transmission[J].IEEE Transactions on Power Systems,2007,22(3):976-984.
[6]李宇骏,杨勇,李颖毅,等.提高电力系统惯性水平的风电场和VSC-HVDC协同控制策略[J].中国电机工程学报,2014,34(34):6021-6031.
[7]徐政.柔性直流输电系统[M].北京:机械工业出版社,2013.
[8]王磊,李兴源,李宽,等.伪双极LCC-VSC型混合高压直流输电系统向无源网络供电的研究[J].电力系统保护与控制,2015,43(21):27-33.
[9]唐庚,徐政,薛英林.LCC-MMC混合高压直流输电系统[J].电工技术学报,2013,28(10):301-310.
[10]TORRES-OLGUIN R E,MOLINAS M,UNDELAND T.Offshore wind farm grid integration by VSC technology with LCC-based HVDC transmission[J].IEEE Transactions on Sustainable Energy,2012,3(4):899-907.
[11]CHEN X,SUN H,WEN J,et al.Integrating wind farm to the grid using hybrid multiterminal HVDCtechnology[J].IEEE Transactions on Industry Applications,2011,47(2):965-972.
[12]GUO C Y,LIU W J,ZHAO C Y.Research on the control method for voltage-current source hybrid-HVDCsystem[J].Science China Technological Sciences,2013,56(11):2771-2777.
[13]余瑜,刘开培,陈灏泽,等.伪双极VSC-LCC型混合直流输电系统启动方法[J].高电压技术,2014,40(8):2572-2578.
[14]曹帅,向往,姚良忠,等.风电经混合型MMC-HVDC并网的交直流故障穿越策略[J].电力系统自动化,2018,42(7):37-43.
[15]于洋,徐政,徐谦,等.永磁直驱式风机采用混合直流并网的控制策略[J].中国电机工程学报,2016,36(11):2863-2870.
[16]蔡帜,刘建政,王健,等.基于PSCAD的双馈风力发电机的控制模式仿真研究[J].电气技术,2008(5):61-64.
[17]卢锴.双馈型风电机组运行控制策略及风电场建模研究[D].广州:华南理工大学电气工程学院,2012.
[18]苏常胜,李凤婷,武宇平.双馈风电机组短路特性及对保护整定的影响[J].电力系统自动化,2011,35(6):86-91.
[19]赵畹君.高压直流输电工程技术[M].北京:中国电力出版社,2004.
[20]赵成勇.柔性直流输电建模和仿真技术[M].北京:中国电力出版社,2014.