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This paper presents the control system design of a DC-DC converter with a three-phase high frequency transformer for dual-stage grid-connected PV applications. This converter is designed to be used in the input stage of parallel single-string PV arrangements for residential applications. The proposed control strategy uses a maximum power point tracking algorithm with an outer voltage loop and an inner current loop. The current loop includes a resonant control action in order to eliminate the 120Hz ripple of the DC bus in the PV modules. Simulation results are presented to validate the proposed control strategy.

Digital controller for an isolated Step-Up DC-DC converter based on three-phase high-frequency transformer for grid-connected PV applications