Cascaded H-Bridge Multilevel Inverter for Single-Phase Grid-Connected PV System with Low Power on PV String

In this paper, a new control technique for two-cell cascaded H-bridge multilevel inverter grid-connected photovoltaic systems was developed from traditional control techniques in order to improve the performance of the system. This was accomplished by tracking the maximum power point injecting into the grid and maintaining the unity power factor even when a photovoltaic string had low power. Additionally, traditional control techniques were used as a basis for the development of this new control technique. In order to demonstrate that the system performed exactly as expected, the results of the MATLAB/Simulink simulation were compared to the results of the conventional approaches.