Grid‐tied single source quasi‐ Z ‐source cascaded multilevel inverter for PV applications

A new cascaded multilevel topology is proposed in this study. It is denominated single DC source quasi‐Z‐source cascaded multilevel inverter (SS qZS‐CMI). The SS qZS‐CMI performs at maximum power point tracking of the photovoltaic (PV) array with a single inverter module and each of the inverter modules shares an equal amount of the power of the whole system. The SS qZS‐CMI has the capacity to equally regulate the peak voltage on each inverter module by means of the dual control loop of the main inverter module and the shoot‐trough state of the auxiliary inverter modules, ensuring the symmetry of the cascaded multilevel inverter. Experimental results verify the proposed topology.