简介：IntroductionInrecent10years,duetofastdevelopingofeconomyinChina,seriouspowershortageoccurs.Thesystemfrequencyoftenfelltoabnormalvaluesinmostnetworks.Forthesecurityofpowersystems,forcedswitchoffoffeedersfromthedistributionsubstationoftenhappendtorecovernormalfrequency.Infact,thespeedofdevelopmentofChinesepowerindustryisveryhighinthisperiod.Theyearlyaverageincreasingrateofgeneratingcapacitywasabout8%.Theyearlynewlyinstalledca-pacitywasmorethan9000MWinrecent4years.Buttheannual

简介：IntroductionAnalysisandforecastofloadcharacteristicsareimportantaspectsinpowermarketanalysisandprediction.Correctlymasteringgridloadcharacteristics

简介：Beganfromearly1992,ChongqingPowerSupplyBureauhadspent3andhalfyearstobuildupapowerloadmanagementsystemconsistingofImasterstation,6relaystations,1280terminalsandthedistributedmonitoringdevice.Thissystemdistributesinthehillyandmountainousareaswheregeographicallycomplicatedandtheloadwidelyscatters,itcansuperviseabout72%loadandcurtailmorethan15%loadwhen