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Improved SRF-PLL using moving average filter (MAF) is an established phase locked loop method for operation of three phase grid connected VSI under non-ideal grid conditions. This three phase PLL method can also be used in a single phase system without changing its structure. Hence, in applications where the grid connected VSI has to work under both three phase and single phase source, a MAF-SRF-PLL is useful for maintaining proper synchronism. In this letter, first an already available design of three phase MAF-SRF-PLL has been evaluated experimentally under various single phase grid condition in terms of unit vector quality. Next the same PLL structure has been tested for situations where circuit reconfiguration from three phase to single phase and vice versa are necessary.

Reconfiguration of Three Phase MAF-SRF-PLL as Single Phase PLL