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A control strategy based upon cascaded loops structure and Proportional-Integral (PI) and Proportional-Resonant (PR) controllers is proposed and presented for the cascaded Quasi-Z-Sourcer inverter with a single source (SS qZS-CMI) input. This inverter interfaces a small PV string with the single-phase grid. The proposed control strategy enables high quality current injection into the single-phase grid in addition with the voltage balance of the DC buses of each inverter module and maximum power point tracking of the array. Experimental results of a 5-level SS qZS-CMI inverter prototype demonstrate the system’s performance and the benefits of employing this topology in comparison with others cascaded inverters.

MULTI-LOOP CONTROL SYSTEM FOR A SINGLE SOURCE INPUT QUASI-Z-SOURCE MULTI-LEVEL INVERTER