A single-phase cascaded H-bridge multilevel inverter has several DC links that allows the system to have the capability of independently voltage control to track the maximum power point in each string connected to each H-bridge. This characteristic can increase the efficiency of the PV system in case of mismatch in the strings, due to unequal solar radiation and temperature. This paper presents a generalized design method for controllers of a multi-loop control scheme applying for grid-connected photovoltaic systems using a single-phase cascaded H-bridge multilevel inverter. The simulation results were carried out by Matlab/Simpower Systems to validate the proposed method under different operating conditions of PV.
Keyword
Cascaded H-bridge multilevel inverter, Grid-connected photovoltaic systems, A multi-loop control scheme
