The　harmonic　current　detection　based　on　multiple　SOGIs　(Second-Order　Generalized　Integrators)　is　proposed,　which　adopts　two　SOGIs　to　build　the　low-pass　filter　and　improve　the　performance　of　FLL　(Frequency　Locked　Loop).　The　cross-feedback　network　is　applied　to　decouple　different　harmonics　and　the　band-pass　filtering　is　used　to　individually　detect　the　fundamental　or　each　harmonic　current　in　real　time.　The　grid　frequency　is　online　tracked　by　an　enhanced　FLL.　The　low-pass　filter　is　cancelled　and　the　phase　locked　loop　is　replaced　by　the　simplified　FLL　with　higher　steady-state　precision　and　better　frequencylocking　performance.　The　results　of　simulation　with　MATLAB/imulink　verify　the　validity　of　the　proposed　method.