A Study on Automatic Control of Steam Turbines of Fossil Power

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1、AStudyonAutomaticControlofSteamTurbinesofFossilPowerPlantwithThermpalStressConstraintsinTurbineRotorsSeongWooKwakandByungKookKimDepartmentofElectricalEngineeringKoreaAdvancedInstituteofScienceandTechnology373-1Kusong-dong,Yusong-gu,Taejon305-701KoreaPhone:+82-042-869-5435/3435FAX:+82-042-869

2、-3410email:kswBigaia.kaist.ac.kr/bkkimQeekaist.kaist.ac.krAbstract-AnewfuzzyturbineloadschedulerThemethodsusedtocopewiththisproblemareissuggestedforfaststart-up/shut-dlownandloadtheoff-lineschedulecontrolsystemofHanzalekandvariationoffossilpowerplants.TheturbineloadIpsen[S]inwhichthestartups

3、cheduleisdeterminedschedulerdeterminestheloadincrease/decreasefromtheturbineinletsteamconditionsandthemetalratebypredictingsteamconditionsandcalculat-temperaturepriortostartup,andoptimizationcontrolingthermalstressesintheturbinerortors.OurloadmethodofBednarskyandShen[lo]inwhichtheyap-schedul

4、erdeterminestheloadvariationrateusingproachthissubjectasaminmaxproblem,andHitachifuzzyrulesbasedonexpert’sknowledgeconcern-controlmethodwhichusesanauto-regressivedynam-ingthermalstressesintheturbinerotors.Asu-icmodeltopredictboileroutletsteamconditionsandpervisoryinferenceengineisaddedtoupda

5、tetheevaluatesthermalstressonthebasisofthepredictedexpert’srulesandtocopewithtimevariationsofboileroutletsteamconditions[2][3].theplant,Theperformanceoftheproposedsched-Inthispaper,wesuggestedanewfuzzyloadsched-ulerisrevealedviasimulatorfortheSeoulFossilulerasatop-levelofturbinecontrolsystem

6、.Itpro-PowerPlantIV.videstheloadchangeratefortheturbine,whilew-suringthethermalstressesalwayswithinanallowablelimit.First,afuzzyinferenceengineissuggestedtodecidetheloadchangerate.Westoredexpertop-I.INTRODUCTIONerator’sknowledgeasfuzzyrules.Next,thefuturevaluesofboileroutletsteamispredicted,

7、andthermalRecently,manynuclearpowerplant:?areinopera-stressesofturbinerotorsarecomputed.Ifthefuturetionandprovideelectricityforbasicconstantloads.thermalstressesarewithinlimits,theloadchangerateIIence,fossilpowerplantsshouldprovideelectricityistran