分频风电系统的控制策略研究

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1、分频风电系统的控制策略研究孙博力高桂革曾宪文上海电机学院电气学院上海电机学院电子信息学院针对高压交流输电系统输电距离不足和高压直流输电系统投入成木过高的问题，提出了一种基于模块化多电平矩阵变换器(M3C)的分频输电(FFTS)系统。在不升高电压等级的条件下，通过降低远距离输电线路屮交流电的频率来减小输电的电气距离，从而提高输电功率，实现交流电远距离输电的目的。M3C是一种新型的电力电子变换器，具有可以在高压、大功率和低频条件下稳定运行的特点。提出了一种基于改进电压空间矢量法的M3C控制策略。采用H桥臂两端的电压代替输出端的有功

2、功率，进行脉冲宽度调制PWM控制。根据直驱式风力发电机的最大功率跟踪原理和分频输电系统的频率特性，提出丫一种分频输电系统的低频侧频率控制策略，即在追求最大功率的同时，保证输出频率控制在1020Hz。最后采用MATLAB/Simulink进行仿真，验证了这W种控制策略的有效性。关键词：分频输电系统;模块化多电平矩阵变换器;电容器;最人功率跟踪;电压空间矢量法；o。ResearchontheControlStrategyofFractionalFrequencyWindPowerSystemSUNBoliGAOGuigeZENGX

3、ianwenSchoolofElectricalEngineering，ShanghaiDianjiUniversity;SchoolofElectronicInformation,ShanghaiDianjiUniversity;Abstract：FortheproblemsthatthetransmissiondistanceoftheHVACtransmissionsystemisinsufficientandthehighinputcostsoftheHVDCtransmissionsystem,thefraction

4、alfrequencytransmissionsystem(FFTS)basedonmodularmultilevelmatrixconverter(M3C)isproposed.Itreferstoreducingtheelectricaldistanceofthetransmissionbyreducingthefrequencyofcurrentinlongdistancetransmissionlinewhilewithoutincreasingthevoltagelevel，therebyimprovingthetr

5、ansmissionpowerandachievingthegoaloflongdistanceACtransmission.Asanewtypeofpowerelectronicconverter,M3Cfeaturestheabilitytooperatestablyunderhighvoltage,highpowerandlowfrequencyconditions;itcanbeusedasacross-overfrequencyconverterforfractionalfrequencywindpowersyste

6、m.AnimprovedvoltagespacevectormethodisputforwardtobeusedasthecontrolstrategyofM3C.TheactivepowerattheoutputendisreplacedbythevoltageacrosstheHbridgearmtocontrolthePWM.Accordingtothemaximumpowerpointtrackingprincipleofdirect-drivenwindturbinegeneratorandthefrequencyc

7、haracteristicsofthefractionalfrequencytransmissionsystem,thefrequencycontrolstrategyforthelow-frcqucncysideisproposed,thatis,inthepursuitofmaximumpoweratthesametime,toensurethattheoutputfrequencycontrolledin10"20Hz.Theeffectivenessofthesetwocontrolstrategiesareverif

8、iedbysimulation.Keyword：Fractionalfrequencytransmissionsystem;Modularmultilevelmatrixconverter(M3C);Capacitor;Maximumpowerpointtracking;Vo