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1、SmithPredictorinTheDDEApplication121ZHANGYuwen,LIDonghai,LAODazhong1.SchoolofAerospaceEngineering,Beijinginstituteoftechnology,Beijing100081E-mail:great.mountain@hotmail.com2.StateKeyLabofPowerSystems,Dept.ofThermalEngineering,TsinghuaUniversity,Beijin
2、g100084E-mail:lidongh@mail.tsinghua.edu.cnAbstract:InordertosolvetheproblemthattheDesiredDynamicEquation(referredtoasDDE)doesnotbeappliedtolargetimedelayproblemofthecontrolledplant,anewmethodwhichcombinesSmithpredictorwithDDEisproposed.Itexpandstheuseo
3、fDDE,usingfruitflyalgorithmbasedonthebestITAEindextotheoptimizationoftheparametertuning,andisusedtothecontroloftypicalindustrylargetimedelayplants.SimulationresultsshowthatthenewstructuregivesbettercontroltothelargetimedelayplantsthanDDEintheoptimizati
4、onindex.KeyWords:LargeTimeDelay,DesiredDynamicEquation(DDE),SmithPredictor,FruitFlyAlgorithm(FOA).theexactmodeloftheplant,andpresentanewmethod,1Introductionwhichcanbewidelyappliedinindustrialcontrolprocesswithlargetimedelay.Simulationresultsshowthatthe
5、[1]DesiredDynamicEquation(referredtoasDDE)isstructurecangreatlyimprovetheresponseperformanceaparametertuningmethodfortwo-degreeoffreedomofthesystemsandhasobviousadvantagesinresponsePI/PIDcontroller.Itcombinesthecontroller’sparameters,speed,overshootand
6、ITAEindex,andimprovestheDDE’scoefficientswhichreflectthedynamicresponserobustnessoftheSmithpredictorwhenthemodelisacharacteristicswiththedisturbanceobserverparametersmismatch.reflectingthesystemdisturbancerejectionability.Thismethodmakesthephysicalmean
7、ingofthecontroller2ControllerStructureDescriptionparametersmoreclearlyandthetuningprocessmore2.1DDEcontrollerstructuredescriptioninstructive.Ithasbeenprovedthatitcanobtainabetterperformancesintheovershoot,adjusttimeandDDEcontrollerhasagoodperformancean
8、dgoodrobustnessinthenon-delayorsmallertimedelayresistancetointernalandexternalinterference[1][2]ability[1].ThegeneralformofthecontrolledplantiscontrolledplantbyWeijieWang,MingdaLi,YichaoHu[3]andotherresearchers.However,duringtheshowedas
