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1、SignificantenergysavingsandreducedemissionsinpowerplantsthroughvariablespeeddrivesFranzFrank(ABBSwitzerlandLtd)–PowerGenEurope2010©ABBGroup
2、Slide1AgendaSavingspotentialbyusingvariablespeeddrivesWhatisaVariableSpeedDrive(VSD)system?VariablespeeddriveapplicationsinpowerstationsComp
3、arisonofprocesscontrolmethodswithrespecttoefficiencyReferencesPaybackcalculation–caseexampleABBmediumvoltagedrivesportfolio©ABBGroup
4、Slide2SavingspotentialbyusingvariablespeeddrivesElectricalaux.consumptioninacoalfiredpowerplant5-10%oftheproducedpowerdedicatedtoelectricalauxiliar
5、yconsumptioninthepowerplant(i.e.“losses”)Processesdrivenbyelectricmotorsconsume~80%ofthiselectricityByapplyingelectricalvariablespeeddrives(VSDs),totallossescanbereducedby>20%Inan800MWpowerplantthereexistsareductionpotentialof>8MW(mountingupto8–12MEURcapitalcosts)Auxiliaryconsump
6、tionElectricMotorsOthers(HVAC,lighting,etc.)©ABBGroup
7、Slide3WhatisaVariableSpeedDrive(VSD)System?Consistingofinputtransformer,frequencyconverter (alsocalled‘drive’)andmotorControllingmotorspeed,torqueandpowerOnprocesslevelcontrolofflow,pressure,level,etc.alwayswithbestpossibleeff
8、iciency!UsualscopeofaVSDsystemInputFrequencyMotor TransformerConverter©ABBGroup
9、Slide4MaincomponentsofaVSDsystemInputtransformerMainpurposeVoltagematchingGalvanicisolationoftheVSD systemfromthemediumvoltagemainssupplyPossibledesignsDrytypetransformersOilimmersedtransformersEffici
10、encies>99%possibletoday, e.g.usingABBEcoDry99plusdesign©ABBGroup
11、Slide5MaincomponentsofaVSDsystemFrequencyconverterMainpurposeContinuousadjustmentofoutputvoltageandfrequencyBenefitsPermanentoperationofthemotoratitsoptimumdutypoint bestpossibleefficiencyHeavydutystartwithoutoverc
12、urrent nomorenetworkdipsIncreasedsystemlifetimeduetoreducedmechanicalandthermalstressofthedrivenequipmentTypesofdesignAircooled (upto~7MVA)Watercooled (from~2MVAon)Efficiencytypically>98%©ABBGroup
13、Slide6M3~TypesofdesignAirandwatercooledForcedorselfventilatedInductionmotorsPowerr
14、ange:upto~22MWEfficienciesof>97%possible
