formancecomparison.OneoftwointernaltimersintheDSPisemployedtodecidethePWMcontrolperiodandtheotherisusedtodeterminethedclinkcurrentinterrupt.Consideringtherectifierblankingtimeof.s,A/Dconversiontimeof.s,andtheothersignaldelaytime,theminimumpulsewidthissettos.A.ExperimentalResultsFig.showsmeasureddclinkcurrentsandphasecurrents.IncaseofsectorVofthespacevectordiagram,thedclinkcurrentcorrespondstofortheswitchingstateofandforthatof.Fig.(a)showstherawdclinkcurrentbeforefiltering.Ithasalotofringingcomponentsduetotheresonanceoftheleakageinductanceandthesnubbercapacitor.Whenthedccurrentissampledattheendpointoftheactivevoltagevectorsasshowninthefigure,themeasuringerrorcanbereduced.Fig..Samplingofdclinkcurrents.Fig..Estimatedsourcevoltageandcurrentatstarting.Toreducethiserrorfurther,thelowpassfiltershouldbeemployed,ofwhichresultisshowninFig.(b).Thecut-offfrequencyoftheButterworth’sse为dq坐标系使用式()qcqcqcMMdcdcdceivRpLLLRpLeiv