Detailed analysis of the implementation of frequency-adaptive resonant

ElectricPowerSystemsResearch116(2014)231–242

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ElectricPowerSystemsResearch

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Detailedanalysisoftheimplementationoffrequency-adaptiveresonantandrepetitivecurrentcontrollersforgrid-connectedconverters

AnaRodríguezMontera,?,EmilioJ.Buenob,1,AurelioGarcía-Cerradac,2,FranciscoJ.Rodríguezb,3,FranciscoM.Sáncheza,4

a

GAMESAElectric,EngineeringDept.,Avda.Fuentemar5,28823Coslada,Madrid,Spain

UniversityofAlcalá,ElectronicsDept.,Ctra.Madrid-Barcelona,km33??600,28871AlcaládeHenares,Madrid,Spainc

ComillasPonti?calUniversity,ElectronicsandAutomaticsDept.,AlbertoAguilera25,28015Madrid,Spain

b

article

info

abstract

Articlehistory:

Received13February2014

Receivedinrevisedform10May2014Accepted16June2014

Availableonline9July2014

Keywords:

Currentcontrol

Frequency-adaptationRepetitivecontrolResonantcontrol

DigitalimplementationConverter

Currentcontrolisacommonfeatureinpowerelectronicsvoltagesourceconvertersconnectedtothegrid.Inthisscenariofrequencydriftscanentailabiglossinperformanceofthesecontrollers,signi?-cantlyworseningthequalityofthepowerdeliveredtothegrid.ThisarticlefocusesonthestudyandimplementationofcurrentcontrolalgorithmsforDC–ACvoltagesourceconverters(VSCs)thatareableofbothreducingtheharmoniccontentsofthegridcurrentandmaintainingtheselectivityofthecurrentcontrolagainstfrequencydrifts,sothatthestabilityofthesystemispreserved.Twotypesofcurrentcon-troltechniquesareinvestigatedhere,namely,resonantandrepetitivecontrollers.Athoroughstudyofalternativeimplementationstructuresiscarriedoutwhilstspellingoutthefrequency-adaptivealgorithmineachcase.Besides,basicguidelinesfortheirsoftwareimplementationaregivenandthecomputationalloadforeachalternativeisanalyzed.

?2014ElsevierB.V.Allrightsreserved.

1.Introduction

CurrentcontrolforVSCsisofparamountimportanceintoday’sapplicationofpowerelectronicsinelectricpowersystem.Someoftheseapplicationsinclude:trackingofgridcurrentharmonics,rejectionofgridvoltageharmonics,operationinislandedsystemslikelytosuffergridfrequencyvariations,microgridsforoperationasgridgeneratororgridtracker,connectionofenergystoragesys-temstothegrid,etc.Asfortheselatterapplications,itismandatorytoensurethepowersupplyoftheauxiliarysystemsirrespec-tiveofthepossiblegridperturbations.Noticeably,frequencydriftsmaytakeplaceinweakgrids,seriouslyaffectingthecontroller’s

?Correspondingauthor.Tel.:+34916710330;fax:+34916710322.E-mailaddresses:anarodriguez@gamesacorp.com,

ana.rodriguez@depeca.uah.es(A.R.Monter),emilio@depeca.uah.es(E.J.Bueno),aurelio@iit.upcomillas.es(A.García-Cerrada),fjrs@depeca.uah.es(F.J.Rodríguez),fmsanchez@gamesacorp.com(F.M.Sánchez).1

Tel.:+34918856584;fax:+34918856591.2

Tel.:+34915422800x2421;fax:+34916710322.3

Tel.:+34918856561;fax:+34918856591.4

Tel.:+34916710330;fax:+34916710322.

performanceaboveallwhenconsideringtrackingcurrentharmon-icswheretherelativeerrorismoreimportant.

Amongtheexistingtechniquesforimplementingthecurrentcontrolforharmoniccompensation,twoofthemostcommonlyusedareresonantandrepetitivecontrollers.

TheGeneralizedIntegrator(GI)[1]wasoneofthe?rstproposalsofresonantcontrol.AsingleGIwascapableofcompensatingbothpositiveandnegativesequencesandseveralresonantcontrollerscouldbeplacedinparalleltotacklemultipleharmonics.ThisGIderivedinthewell-knownSecondOrderGeneralizedIntegrator(SOGI).

TheSOGIintroducesanin?nitegainattheresonantfrequencywhichcanmaketheclosed-loopsystemunstableasitdoesnotmakeanycontrolinthephaselagintroduced.Thus,theadditionofalead-lagnetworktotheoriginalSOGIwasproposedintheliteratureinordertocontrolthephaseshiftnearbytheresonantfrequency[2,3].Inthisarticle,thistechniquereceivesthenameofSecondOrderGeneralizedIntegratorwithlead-lagnetwork(SOGI-LLN).Anothertechniqueofresonantcontrolistheso-calledAdaptiveFeedforwardCancelation(AFC).AdiscretetimeAFCwasdesignedtocontroltheoutputvoltageofafull-bridgeDC–ACinverterin[4]followingtheloop-shapingapproachpresentedin[5].

http://dx.doi.org/10.1016/j.epsr.2014.06.011

0378-7796/?2014ElsevierB.V.Allrightsreserved.

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