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1、电力系统分析上（Powersystemanalysis）Powersystemanalysis,.Txtcopy(copy)otherpeople'spersonalitysignature,notcalledplagiarism,notcallednoassertive,justfeelright.Thesamethinghappened.1.whatisthepowersystem?Whatisthepowergrid?Powersystem?P1Theproduction,transportation,distributionandcon
2、sumptionofelectricalenergyareconnectedtogetherbyelectricalequipment,andthewholeiscalledthepowersystem.Thepartofpowersystemthattransportsanddistributeselectricalenergyiscalledthepowergrid.ItconsistsofUPS,step-downtransformersandtransmissionlinesofvariousvoltagelevels.Steamtur
3、bines,boilers,heatingpipesandthermalusersinthermalpowerplants,turbinesandreservoirsinhydropowerplantsarerelatedtopowerproduction.2.basicrequirementsforpowersystemoperation?(1)toensuresafeandreliablepowersupply;(2)tomeettherequirementsofthepowerquality;(3)havegoodeconomic;(4)
4、minimizetheharmfuleffectsontheecologicalenvironment.3.,themainindicatorstomeasurethequalityofpower?P5Voltageandfrequencyareverybright,thetwobasicindicatorsofpowerquality,aswellaswaveform.4.whatistherelationshipbetweenthefrequencyandtheactivepowerofthepowersystem?Whatistherel
5、ationshipbetweenvoltageandreactivepower?Thefrequencyismainlydeterminedbytheactivepowerbalanceinthesystem,andtheactivepowerofthesystemisnotenough,andthefrequencywillbelow.Thevoltagedependsmainlyonthereactivepowerbalanceinthesystem.Whenthereactivepowerisinsufficient,thevoltage
6、islow.5.whatisavoltagedrop?Voltageloss?Voltageoffset?(P10)Avoltagedropisavectordifferencebetweenthetwovoltagesattheheadendofacomponent.Voltagelossusuallyreferstothedifferencebetweentheabsolutevaluesofvoltagebetweentwopoints.Voltagedeviationisthedifferencebetweentheactualvolt
7、ageatanypointinthepowergridandtheratedvoltageofthenetwork.VoltageoffsetThenaturalpowerdistributionof6.closednetworks?Economicpowerdistribution?Characteristicsofthe7.admittancematrix?Thephysicalmeaningofdiagonalelementsandnondiagonalelements?(P72)(fromcourseware)Features:symm
8、etryandsparsenessPhysicalsignificance:thediagonalelementofthenodaladmittanc
