A novel open-loop control method for a current-source active power filter

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1、IEEETRANSACTIONSONINDUSTRIALELECTRONICS,VOL.50,NO.2,APRIL2003313ANovelOpen-LoopControlMethodforaCurrent-SourceActivePowerFilterMikaSaloandHeikkiTuusaAbstract—Thispaperpresentsanewcontrolsystemforacurrent-sourceactivepowerfilter.Theharmoniccurrentcom-pensationisrealizedusingonlyafeedforwardcontrol

2、oftheloadcurrents.TheLCfilterresonanceoftheconverterisdampedinanopen-loopmannerusingthedynamicequationsofthesupplyfilter.Thebenefitsoftheproposedcontrolsystemarethatitissimpleandstraightforward,thenumberofmeasurementsandsensorscanbeminimized,andalsothattheLCfiltersizecanbeoptimizedaccordingtoprop

3、erharmonicdistortationlevelofthesupplycurrentswithoutcareaboutthestabilityissuesoftheclosed-loopsystem.Thisusuallyleadstoreductionofthefiltersize.Also,thechangesinfundamentalcurrentcomponentsoftheactivefiltercanbeeffectivelyrealizedwhentheactivepowerfiltercanalsobeusedasafastreactivepowercompensa

4、tor.ThecontrolsystemalsoincludesthecalculationdelaycompensationFig.1.Maincircuitofthecurrent-sourceactivepowerfilter.ofthedigitalcontrolsystem.Thecontrolsystemisrealizedusingasingle-chipMotorolaMPC555microcontroller.Thetestswithsupplyfilter.Thedrawbackoftheclosed-loopcontrolisthatthetheprototypes

5、howeffectivecurrentharmoniccompensatingperformanceofthenonlinearloads.LCfilterisoftenoversized,comparedtothesizewhatwouldbeadequateforproperharmonicdistortionlevel,inordertoen-IndexTerms—Activefilters,current-sourceconverter,digitalcontrol,microcontrollers,powerquality.surethattheresonancefrequen

6、cyofthefilterislowenoughtokeeptheclosed-loopsystemstable.Also,theclosed-loopcon-trolcomplicatesthedccurrentandreactivepowercontrolsinI.INTRODUCTIONsomecontrolsystemsbecausetheclosed-loopcontrolopposesNRECENTYEARS,activepowerfiltershavebeenwidelythechangesinthemagnitudeandthephaseangleofthefunda-I

7、investigatedforthecompensationofharmoniccurrentsinmentalcurrentcomponentduetotimedelayinharmoniccurrentelectricalpowersystems.Theseactivepowerfiltersaredividedextraction.intotwotypes:voltage-sourceactivefilters(VSAFs)a