1Cascaded Multilevel Converters and Their Applications in Photovoltaic Systems

Abstract — Unique features of multi-level converters have re-cently nominated them as significant alternatives for solid-state power converting units, even in the low and medium power range. The fact that Multilevel converters need several DC sources in the DC side, makes them attractive for Photovoltaic(PV) applications. This paper presents a new control strategy to control Cascaded Multilevel converters in a multi-string configuration for single phase grid connected systems. Eventually, simulation results are provided to validate the control system under various insolation conditions. I