ovidedtodemonstratetheusefulnessoftheproposedACEcalculationmethodandAGCexecutionperiodinthispaper.II.EXISTINGACECALCULATIONMETHODSA.ConstantfrequencybiasfactorACEusingfrequencybiasfactoriscalculatedasfollows;ACE=(PaPs)+B(fafs)=ΔPtie+BΔfwherePa:ActualnetpowerinterchangePs:Scheduledpowerinterchangefa:Measuredfrequency第页fs:NominalfrequencyB:FrequencybiasfactorΔPtie:PowerinterchangedeviationΔf:FrequencydeviationFrequencybiasfactor,B,isdeterminedasfollowsBsysReqDReq(RRRRn)whereR:SpeedregulationparameterorDroopD:LoaddampingconstantBsys:SystemfrequencybiasfactorReq:SystemdroopSincetheobjectiveofAGCistoregulategenerationofunits,theinputofAGCshouldbetheactualACE.WhenthefrequencybiasoftheACEmatcheswiththeactualfrequencybiasofthearea,thecalculatedACEandtheactualACEareidentical[].However,itisnotpracticaltoconsid第页其中fT:T时刻频率,GiTP:第i个机组在T时刻功率输出偏差N:发电机组数量T:恢复频率所用时间()中实际频率偏差