A single switch two stage elementary converter based topology for hybrid standalone microgrid applications

Abstract

This paper proposes a novel single-switch circuit which converts input DC voltage into desirable AC and DC voltages. The switch is controlled to accomplish maximum power point tracking and maintain the desired AC and DC voltage levels. The circuit utilizes the voltage excursions across the intermediate stage inductor to obtain the AC voltage. The required 50 Hz component is obtained by adopting sinusoidal pulse width modulation (SPWM) for the switch. This circuit can be used for residential applications in islanded mode where both AC and DC supplies are required. Powered by a solar PV array, this circuit can meet the load demands during the day time. The single switch implementation makes the circuit rugged and quite simple to control. The circuit has been extensively simulated in MATLAB/SIMULINK for different loading conditions and the simulation outputs corroborate the analytical results.