Abstract
This paper designed a three-phase photovoltaic(PV) grid-connected inverter based on single levels grid-connected structure, use the control strategy combining by PI control and repetitive control, and proposes a new phase-locked method using subdivided and adjustable-step to realize high precision phase lock. Finally, modeling simulation in MATLAB environment, and the simulation results show that the output grid waveform is good, the validity of the design is verified by simulation and test.
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