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1、IEEETRANSACTIONSONPOWERSYSTEMS,VOL.20,NO.1,FEBRUARY2005507p!iAMethodtoImprovethePerformanceofConventional!ontherightsideof(1)becomes1],takingthepartialderivativeStaticLoadModelswithrespecttovoltageonbothsidesof(1)andrearrangingthetermsintheresultingequat
2、ionproduceK.W.Louie,Member,IEEE,andJ.R.Marti,Fellow,IEEE1@Pip01=pviVi:(3)Poi@ViAbstract—Thisletterdeliversamethodtoimprovetheperformanceofstaticloadmodels,inwhichtheexponentsofexponentialpowerfunctionsEquation(3)indicatesthatattheratedvoltageof1p.u.,pvii
3、sthearetreatedasconstant.Theseexponents,however,dependonvoltageandfrequency.Theproposedmethodupgradestheperformanceoftheloadnormalizedrateofpowerchangewithrespecttovoltage.Inthevoltagemodelsbydynamicallyadjustingtheexponents,makingtheloadmodelsrangefrom(
4、10M1V)to1p.u.,theweightednormalizedrateofpowervalidinwiderrangesofvoltageandfrequency.changeatvoltageVjisgivenbyIndexTerms—Loadmodeling,staticloadmodelimprovement.1@PP@VVRV=(4)MI.INTRODUCTION1@PP@VVk=0Millionsofdifferentelectricalloaddevicesareconsuminge
5、nergyinanelectricpowersystematagivenmoment.Theloadcomponents,wherej,k,andMareintegers;Vjisavoltageof(10j1V)p.u.;Vkthus,havestrongeffectsonthepowersystem’sbehaviorandshouldbeisavoltageof(10k1V)p.u.;Rvjistheweightednormalizedrateofmodeledcloselyinsystemstu
6、dies.AccurateloadmodelingcanavoidactivepowerchangeatvoltageVj;and1Visthevoltageincrement.costlysystemdesignmiscalculationsanderroneoussystemoperationAccordingly,inthevoltagerangefrom(10M1V)to1p.u.,pvibasedonimpreciseoperationallimits[1].Astaticloadmodelr
7、epre-canbeadjustedbasedonthevoltagechangesassentstheactiveandreactivepowerofaloadcomponentatanyinstantasfunctionsofvoltageandfrequency,suchasexponentialfunctionsM1@Pi[2],[3].Theexponents,whichareactuallyfunctionsofvoltageandpvi0adRVPoi@Vfrequency,ofthep
8、owerfunctionshaveconstantvaluesinstaticloadj=0Vmodels.Toimprovetheperformanceoftheseloadmodels,theex-M1@PponentsshouldbeadjustedaccordingtothechangesofvoltageandP@VV1@Pi:(5)frequency.MPoi@Vj=01@PVP@VVk=0II.EXPONENTADJUSTM
