CHBMLI Based PVDG System With Improved Power Quality Features And Battery Backup

This paper presents a control strategy for a 1-Φ Cascaded H-bridge Multilevel Inverter (CHBMLI) to enhance the power quality of Photovoltaic Distributed generation (PVDG) system with battery backup. The system is controlled in such a way that multiple functions are realized in the PVDG system, such as - (1) active power flow control between the PV system and the grid. (2) reactive power compensation. & (3) grid current harmonic compensation. (4) Battery power control. For the optimal utilization of the PVDG system, an MPPT controller is included in the system. The feasibility of the proposed control scheme for CHBMLI based PVDG system with battery power backup is verified by simulation results.