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Software Phase Locked Loop Design Using C2000 ...
ApplicationReportSPRABT4A November2013 SoftwarePhaseLockedLoopDesignUsingC2000 Microcontrollersfor ThreePhaseGridConnectedApplicationsManis hBhardwajABSTRACTG ridconnectedapplicationsrequirean accurateestimateof the grid angleto feedpowersynchronoustothe is achievedusinga softwarephaselockedloop(PLL).Thisapplica tionreportdiscussesthedifferentchallenge sin the designof softwarephaselockedloopsfor threephasegrid connectedinvertersand presentsa methodologyto illustrate,two well knownPLL structures[1], [2] are discussedand ControlSuite .. of Figures1 Transformationof VoltageFromThreePhaseto Stationaryand TransformsFromThreePhaseto 3ph-Basedon Responseto VaryingGrid NegativeSequenceof Responseto VaryingGrid phaseangleof the utilityis a criticalpieceof informationfor the operationof powerdeviceslike PVInvertersthat feedpowerinto the PLL is a closedloop systemin whichan internaloscillatoriscontrolledto keepthe time and phaseof an externalperiodicalsignalusinga qualityof the lock directlyaffectsthe performanceof the controlloop in grid tied line notching,voltageunbalance,li
Application Report SPRABT4A–November 2013 Software Phase Locked Loop Design Using C2000™ Microcontrollers for Three Phase Grid Connected Applications
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