This paper proposes a single-stage direct resonant AC medium voltage (MV) grid-connected solar PV inverter. It produces rectified sinusoidal AC current at the output of the rectifier and is then unfolded by a line frequency unfolding inverter. A combination of switching frequency and phase-shift modulation is used to reduce losses. Primary side LLC converter parameter selection is discussed, and an MV HFT is designed. A compact MV stage is designed, and the thermal performance of the cooling system is verified. A novel fiber optics-based sensor design is employed to address insulation challenges. The system performance is simulated for 1/3 MW at a single-phase 11.3 kV grid connection in MATLAB/Simulink. ZVS conditions are verified through experiments on a preliminary prototype.
