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基于模糊PID的离网型风力发电系统功率控制.docx

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基于模糊PID的离网型风力发电系统功率控制 Abstract: Windenergyhasemergedasaprimesourceofrenewableenergy.However,theissueofintermittencyandinstabilityofwindenergyhasalwaysbeenachallengeinthefieldofwindenergy.ThispaperaimstoimplementafuzzyPID-basedpowercontrolschemeforanoff-gridwindpowersystem.Theproposedcontrolschemeprovidesthefeasibilityofharnessingwindenergyeffectively,minimizingtheimpactofwindenergy'sintermittentandunstablenatureonthepowergrid. Introduction: Windenergyhasemergedasapromisingsourceofrenewableenergyinrecenttimes.Withtheincreaseinenergydemandandthecallforreducinggreenhousegasemissions,windenergyhasgainedmoreacceptanceasacleanandsustainablesourceofenergy.However,thebiggestchallengeassociatedwithwindenergyisitsintermittentandunstablenature.Thesevariationsinwindpowernotonlycausetheinstabilityofpoweroutputbutalsohaveanundesirableimpactonthepowergrid.Hence,itbecomescrucialtoregulatethewindpowertoensurethatitmeetsthepowerdemandinastableandconstantmanner.Inthisregard,theimplementationofanefficientandrobustpowercontrolsystemishighlyessential. ControlScheme: TheproposedcontrolschemeinvolvestheimplementationofafuzzyPID-basedpowercontrolsystem.TheFuzzyPDcontrollerprovidesarobustandefficientwayofregulatingthepoweroutputbytakingintoconsiderationthevaryingwindspeed.ThePID(Proportional,Integral,Derivative)controllerhelpsinachievingstableandconsistentpoweroutputbyregulatingthedutycycleofthegenerator.Therefore,toovercometheshortcomingsoftheconventionalPIDcontrolscheme,theFuzzyPDcontrollerisintegrated.ThefuzzycontrollertunesthePIDparameterstomaintainthepoweroutputclosetothereferencevalueirrespectiveoffluctuationsinwindspeed. Thefuzzycontrollerusesthevariablesoferror(E),changeinerror(CE)andsumoferror(SE)toderivethecontrolaction.Theinputvariablesoferror,changeinerror,andsumoferrorarefuzzifiedintotriangularmembershipfunctions.Theoutputvariabledutycycleisfuzzifiedintoatriangularmembershipfunction.Theappropriatefuzzylogicrulesareformedandusedtodrivethecontrolactionbasedonthesemembershipfunctio