基于和声搜索算法的主汽温控制系统的建模与优化

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1、华北电力大学硕士学位论文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