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1、華北電力大學(xué)碩士學(xué)位論文AbstractAsthermalpowerunitsdevelopinhigh-parameter,high-capacitydirection,thecontrolrequirementsofthethermalsystembecomemorestringent,andthecontrolofmainsteamtemperature,whichrelatedtothesafeandeconomicoperationoftheunit,hasbeenanimportantanddifficulttask.Inthispa
2、per,IMC-PIcascadecontrolstrategyformainsteamtemperaturecontrolisdiscussed.Outerloopusesadvancedinternalmodelcontrol,whileinnerloopusingclassicPIcontrol.Thenuseakindofimprovedharmonysearchalgorithm(PSO-IHS)formainsteamtemperaturemodelidentificationandprimaryandsecondaryloopcon
3、troller'sparametersoptimizationtoachieveintelligentoptimizationcontrolofmainsteamtemperaturesystem.Studyfoundthat,stochasticoptimizationresultssatisfythenormaldistribution,andtheexpectedvalueistheoptimalsolution.Therefore,thesecondaryoptimizationmethodbasedonstatisticaltheory
4、andNewtonmethod,isproposedtoimprovetheoptimizationresultsofstochasticoptimizationalgorithms.Experimentsshowthat,thesecondaryoptimizationmethodcaneffectivelyimprovetheaccuracyofstochasticoptimizationalgorithms.Someproblemsareencounteredinmainsteamtemperatureidentificationwhich
5、isbasedonPSO-IHSalgorithmandusingfielddata.Empiricalmodedecompositionisusedforfilteringofnoiseddataaccordingtothecharacteristicsthatfielddatacontainsmanydisturbancesignalsespeciallyhighfrequencydisturbance.Identificationstrategiesareanalyzedandcompared,whichisaimingatthecompu
6、terimplementationandnumericalcalculationabouttheidentificationoftransferfunctionmodel.Theidentificationresultofmainsteamtemperaturesystemofacirculatingfluidizedbedunitshowsthattheobtainedmodelhashighprecisionandcanreflectthedynamicandstaticcharacteristicsoftheactualmainsteamt
7、emperaturesystem.PSO-IHSalgorithmisusedtooptimizetheparametersoftheouterandinnerloopcontrollerofIMC-PIcascadecontrolsystemrespectively.ThesimulationexperimentsofmodelmismatchcasesofinternalmodelcontrollershowthattheIMC-PIcascadecontrolstrategyisrobustenoughtomeettherequiremen
8、tsofcontrollingmainsteamtemperaturesystemwithmulti-interference,time
