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Chap.5HydroelectricPowerPlantChap.5HydroelectricPowerPlantNotes
1.Wenoteahighlydesirablefeatureofhydropowerplants:thespeedwithwhichtheymaybestartedup,broughtuptospeed,connectedtothepowernetwork,andloadedup.
2.Thishydropoweriswellsuitedforturningonandoffatadispatcher'scommandtomeetchangingpowerneeds.3.Wenotethatwhenwaterisinshortsupply,itisdesirabletousethelimitedavailablepotentialenergysparingly,forperiodsofshortduration,tomeetthepeak-loaddemands.
	Whenwaterisplentifulwiththeexcessflowingoverthespillwayofthedam,base-loaduseisindicated.4.Itisnotpracticaltoshutdownthelargestandmostefficientthermalunitsatnight,sotheyarekept"on-line"supplyingrelativelysmall(light)loads,whenoperatinginthismodethepumpingpowermaybesuppliedatlowincrementalcosts.5.Ontheotherhand,atthetimeofpeakdemandthepumpedstorageschemeprovidespowerthatwouldotherwisehavetobesuppliedbylessefficient(older)plants.
	Fromthepointofviewofthethermalpartofthesystem,thepumpedstorageschemeshavesthepeaksandfillsthetroughsofthedailyload-demandcurve.Chap.5HydroelectricPowerPlantChap.5HydroelectricPowerPlantChap.5HydroelectricPowerPlantChap.5HydroelectricPowerPlant