Chap.5HydroelectricPowerPlantPart3DesirableFeatureofHydroplantWordsandExpressions(A)remotecontroldispatchdispatcherpeak-loadbase-loadoff-peakshavethepeaksfillthetroughs
Chap.5HydroelectricPowerPlantpumpedstoragethedailyload-demandcurve
Notes1.Wenoteahighlydesirablefeatureofhydropowerplants:thespeedwithwhichtheymaybestartedup,broughtuptospeed,connectedtothepowernetwork,andloadedup.Chap.5HydroelectricPowerPlant
2.Thishydropoweriswellsuitedforturningonandoffatadispatcherscommandtomeetchangingpowerneeds.Chap.5HydroelectricPowerPlant
3.Wenotethatwhenwaterisinshortsupply,itisdesirabletousethelimitedavailablepotentialenergysparingly,forperiodsofshortduration,tomeetthepeak-loaddemands. Whenwaterisplentifulwiththeexcessflowingoverthespillwayofthedam,base-loaduseisindicated.Chap.5HydroelectricPowerPlant
4.Itisnotpracticaltoshutdownthelargestandmostefficientthermalunitsatnight,sotheyarekepton-linesupplyingrelativelysmall(light)loads,whenoperatinginthismodethepumpingpowermaybesuppliedatlowincrementalcosts.Chap.5HydroelectricPowerPlant
5.Ontheotherhand,atthetimeofpeakdemandthepumpedstorageschemeprovidespowerthatwouldotherwisehavetobesuppliedbylessefficient(older)plants. Fromthepointofviewofthethermalpartofthesystem,thepumpedstorageschemeshavesthepeaksandfillsthetroughsofthedailyload-demandcurve.Chap.5HydroelectricPowerPlant
Chap.5HydroelectricPowerPlantPart4NonthermalElectricEnergyProductionWordsandExpressions(A)artificialtideintermittentphotovoltaiceffectscheme
Chap.5HydroelectricPowerPlantNotes1.Itisestimatedthatthehydroelectriccontributiontothetotalenergysupplywillshrinktoabout2%bytheyear2000.
Chap.5HydroelectricPowerPlant2.Therareafewsitesaroundtheworld