智能控制在电厂主蒸汽温度控制系统中的应用研究

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1、浙江大学博士学位论文智能控制在电厂主蒸汽温度控制系统中的应用研究姓名：冯晓露申请学位级别：博士专业：热能工程指导教师：岑可法;袁镇福20060201AbstractThecontrolofmain-steamtemperatureisoneoftheproblemsattheprocesscontrolinpowerplant，themainreasonsare：Firstly，theobjectofmain-steamtemperaturealwayshasthecharacteristicoftime—delayed，andthelargertheunitcapacityis，t

2、helongerthedelayedtimeis，whichalwaysmakesfeedbackcontrolseemedtoolatetoact．Secondly，thedynamiccharacteristicofmain-steamtemperaturewillchangewhentheconditionchanges，whichwillcausetherealcontrollingeffectofthecontrollerwithfixedparametersworse．Ontheotherhand，thedynamiccharacteristicofmain-steamt

3、emperatureobjectisnonlinear，whichalsoincreasesthecomplexityofcontr01．Accordingtothesecharacteristicsofmain-steamtemperatureobject，suchaslongtime—delayed、nonlinearandmodelchangeable，wehavedonetheresearchworksoncomprehensiveapplyingofmultipleintelligentcontroltechnologiesatthecontrolsystemofmain-

4、steamtemperature．Webringsfor,ardanewkindofstate—observerandrealizethereconstructionoftheabeadtemperaturesignal．Thenewstate—observerisdifferentwiththeusualgradually-approachingstate—observerorreduced—orderstate—observer，itisattachedwiththepuretime—delayedblock，anditsstructureismoresimpleanddirec

5、t．Thesimulatingresultsho-sthat：thestateonthisstate—observerismoreclosertothestateontherealsysteJLBydetailedlyanalyzingthecontrolproblemscausedbythetime—delayedcharacteristicofthemain-steamtemperaturesystem，itisclearlystatedherebythat：whenthedelayed-timeexceedsacertainlevel，anyformoffeedbackcont

6、rolisunabletogainasatisfiedcontrolresult．MeanWnilethefactthataparticularlydesignedintelligentfeed—forwardeffectmaysolvethelongtime—delayedproblemisbrotIghtforwar&Accordingtotheexperienceoftheskilledoperators，wedesignedafeed—forwardcontrollerwhichisbasedontheneuralnetworktechaologyforenhancingth

7、emain-steamtemperaturecontrolsystem．Aimingatthecharacteristicofuncertaintyofthemain-steamtemperatureobject，weapplytheFuzzycontroltechnologyonthemain—steamtemperaturecontrolsystem．Abovethis，wedesignadynamicVoptimizingmethodbasedong