Investigation on pulse-width amplitude modulation-based single-phase quasi-Z-source photovoltaic inverter Academic Article uri icon


  • The Institution of Engineering and Technology. The pulse-width amplitude modulation (PWAM) method was proposed for the single-phase quasi-Z-source inverter (qZSI)-based photovoltaic (PV) power system to reduce quasi-Z-source (qZS) impedance values while improving efficiency. The method modified sinusoidal pulse-width modulation (SPWM) of the qZSI by combining pulse-amplitude modulation (PAM) and a varied dc-link voltage envelope was produced. The SPWM worked at low dc-link voltage, lowering voltage stress and avoiding shoot-through switching. The PAM worked at the varied dc-link voltage, reducing the number of switching events. As a result, the power dissipation decreased compared to working at the constant dc-link voltage. This study further investigates the PWAM-based single-phase qZS PV inverter system. An improved topology with control strategy is proposed for its grid-connected and standalone operation. Design method of impedance parameters is detailed. The performance in boost and buck operation is discussed when the single-phase qZSI using SPWM and PWAM. Simulation and experimental results verify outstanding features of the PWAM for single-phase qZSI, and the proposed approach for dual-mode operation of the PWAM-based single-phase qZS PV power system.

published proceedings


author list (cited authors)

  • Liang, W., Liu, Y., Ge, B., & Abu-Rub, H.

citation count

  • 16

complete list of authors

  • Liang, Weihua||Liu, Yushan||Ge, Baoming||Abuā€Rub, Haitham

publication date

  • November 2017