Photovoltaic system interface with single phase AC grid using HPWM controlled Quasi-Z-Source inverter

The paper presents a photovoltaic (PV) power system interface with single phase AC grid using a hybrid pulse width modulated (HPWM) single phase quasi-Z-source inverter (qZSI). It is a single stage converter having the capability of boosting the input PV panel voltage and converting it to AC voltage to supply power to AC grid. The qZSI uses an effective control strategy of integrating the sinusoidal pulse width modulation (SPWM) and pulse amplitude modulation (PAM). This integrated hybrid HPWM technique is implemented in generating the control pulses for qZSI. In hardware, these control pulses are generated by using the pwm module of the MICROCHIP DSC. When the instantaneous AC grid voltage is less than the input PV panel voltage, the SPWM controls the single phase qZSI and when the input PV panel voltage is less than AC grid voltage, PAM works. The simulation results of the proposed scheme and the control pulses generated in hardware are shown in the paper.