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时间:2020-03-20
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1、Comparedwithbase-loadpowerplants,suchascoalornuclearpowerplants,theutilisationtimeofwindpowerplantsislower.Thisimpliesthatinordertoobtainthesameenergyproductionfromabase-loadpowerplantandawindfarm,theinstalledwindfarmcapacitymustbesignificantlylargertha
2、nthecapacityofthebase-loadpowerplant.3.7BasicIntegrationIssuesRelatedtoWindPowerThechallengethattheintegrationofwindpowerposescanbeillustratedusingFigure3.9.Inthispowersystem,thereareindustriesandhouseholdsthatconsumepowerPDandawindpowerstationthatdelive
3、rspowerPW.Theadditionalpower,PG,isproducedatanotherlocation.TheimpedancesZ1–Z3representtheimpedancesinthetransmissionlinesandtransformersbetweenthedifferentcomponents.Inanelectricpowersystem,suchastheoneillustratedinFigure3.9,powercannotdisappear.Thismea
4、nsthattherewillalwaysbeabalanceinthissystem,asPG¼PDþPLPW;ð3:16ÞwherePG¼additionalrequiredpowerproduction;PD¼powerconsumption;PL¼electricallossesintheimpedancesZ1–Z3;PW¼windpowerproduction.Equation(3.16)isvalidforanysituation;itdoesnotmatterwhetherwelook
5、atashorttimeperiod(e.g.minutes)oralongperiod(e.g.ayear).Equation(3.16)alsoimpliesthatelectricitycannotbestoredwithinanelectricpowersystem.Henceanychangeinelectricitydemand(orwindpower)mustbesimultaneouslybalancedbyothergenerationsourceswithinthepowersyst
6、em.3.7.1ConsumerrequirementsAsmentionedinSection3.4,themainaimofapowersystemistosupplyconsumerswiththerequiredelectricityatanygiventimeatareasonablecost.Fromtheconsumer’sperspective,threemainrequirementscanbedefined:Figure3.9Illustrativepowersystem.Custo
7、merrequirement1(CR1):thevoltagelevelattheconnectionpointhastostaywithinanacceptablerange[seeEquation(3.10)],asmostcustomerappliances(e.g.lightingequipment,motors,computers,etc.)requireaspecificvoltagerange(e.g.230V10%)forreliableoperation..Customerrequi
8、rement(CR2):thepowershouldbeavailableatexactlythetimetheconsumersneeditinordertousetheirvariousappliances(i.e.whenacustomerswitchesonacertaindevice)..Customerrequirement3(CR3):theconsumedpowershouldbeavailableatareason-abl
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