Research on Modulation Strategy of Single-phase Z-source Photovoltaic Grid-connected Inverter

The through state is allowed in traditional single-phase Z-source inverter,and the reliability of the system is improved.With the advantages of Z-source inverter,modified PWM strategy is put forward.Switch commutation process and the stress of power devices are analyzed,and the efficiency of the inverter with conduction losses model,switching losses model and inductance losses model are calculated.Compared with the simple Boost control strategy,the efficiency of single-phase Z-source inverter is improved in the modified PWM strategy.Experimental results show the proposed PWM strategy is feasible and correct.