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电压源换流器高压直流输电的控制策略及其参数优化(英文).docx

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电压源换流器高压直流输电的控制策略及其参数优化(英文) ControlStrategyandParameterOptimizationofVoltageSourceConverter-BasedHighVoltageDCTransmission Introduction: Withtherapiddevelopmentofpowertechnology,HighVoltageDirectCurrent(HVDC)transmissionhasbeenwidelyusedinpowerdemandregionsforitshightransmissionefficiency,largecapacity,andsecurityperformanceadvantages.Thevoltagesourceconverter-basedHVDCtransmission(VSC-HVDC)isanewkindofHVDCtransmission,whichisanimportantbreakthroughinHVDCtechnology.ThispaperwilldiscussthecontrolstrategyandparameteroptimizationofVSC-HVDC. Background: VSC-HVDCisatwo-waypowertransmissionthatusestheconvertertochangethevoltagelevelforpowertransmission.TheVSC-HVDChasmanyadvantages,suchasbettercontrollability,smallersize,andfasterdynamicresponsecomparedtoconventionalHVDCtransmission.Therefore,theVSC-HVDChasbeengraduallyappliedinpowersystems,especiallyinconnectingoffshorewindfarmstothemaingrid. ControlStrategy: ThecontrolstrategyoftheVSC-HVDCissimilartothatofthePWMinverter.TheVSC-HVDCcontrolsystemmainlyincludesaDCvoltageregulator,gridcurrentandvoltagecontrol,andaphase-lockedloop(PLL).ThepurposeoftheDCvoltageregulatoristostabilizetheDCvoltageoftheconverter.ThecurrentandvoltagecontrolisusedtoregulatetheactiveandreactivepowerflowsbetweentheACgridandtheDCgrid.ThePLLisusedtosynchronizetheconverterwiththeACgrid. ParameterOptimization: TooptimizetheVSC-HVDCsystem,therearemanyparametersthatneedtobeoptimized.ThekeyparametersincludetheDCvoltagecontrolcoefficient,thecurrentcontrolcoefficients,thegridimpedanceestimation,andthecurrentlimit.TheDCvoltagecontrolcoefficientcanbeoptimizedbyadjustingthePIcontrolgainsoftheDCvoltageregulator.ThecurrentcontrolcoefficientscanbeoptimizedbyadjustingthePIcontrolgainsofthecurrentcontroller.ThegridimpedanceestimationcanbeoptimizedbyadjustingthePLLfilterparameter.Thecurrentlimitcanbeoptimizedbyadjustingthecontrolalgorithm. Conclusion: Insummary,thispaperhasdiscussedthecontrolstrategyandparameteroptimizationofVSC-HVDC.VSC-HVDChasmanyadvantages,suchasbet