With　phase　locked　loop　based　on　dual　second-order　generalized　integrator　(DSOGI-PLL),　the　synchronization　signals　of　unbalanced　and　distorted　grid　are　extracted　by　producing　the　orthogonal　signals　and　filtering　the　harmonic　with　second-order　generalized　integrator　(SOGI).　The　synchronous　signals　extracted　through　DSOGI-PLL　fluctuate　when　there　are　multiple　harmonics　among　voltage　sequence　in　grid,　which　reduces　the　performance　of　SOGI.　By　applying　the　harmonic　eliminating　module　to　the　structure　of　DSOGI-PLL,　this　paper　proposed　a　modified　DSOGI-PLL.　It　can　eliminate　the　impact　of　harmonics　effectively　and　extract　synchronization　signals　of　the　grid　voltage　accurately　when　the　harmonics　in　grid　voltage　are　eliminated　through　harmonic　eliminating　modules　before　calculating　the　positive　and　negative　sequence　voltage.　MATLAB　simulation　and　numerical　tests　show　that　the　fundamental　positive　and　negative　sequence　components,　frequency　and　phase　angle　can　be　obtained　effectively　in　the　case　of　unbalanced　voltage　with　multiple　harmonics　in　grid.　©　2016　Chin.　Soc.　for　Elec.　Eng.