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As sketched above, either with a PLL or an adaptive filter, e.g. a SOGI-FLL (frequency locked-loop based on second order generalized integrator). Single phase PLL scheme below:

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In addition to quadrature (cos) NCO signal used in phase detector we'll have an in-phase (sin) signal as current reference.

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SOGI FLL scheme below, both diagrams copied from Teodoresco et al, chapter 4 Grid Synchronization in Single-Phase Power Converters, see post #6

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