Performance Investigation of Five Level Cascaded Multilevel Inverter-Based Solar PV System with Charge Balance Control

This study presents a MATLAB-based simulation of a multilayer inverter-based solar photovoltaic (PV) system. Cascaded H-Bridge multilevel inverters (CHB-MLI) are the best choice for converting DC to AC in solar PV systems. The number of switches necessary to implement the CHB-MLI is increased. With a reduced number of switches, a CHB-MLI architecture is proposed in which six switches are required to implement five-level MLI and two more switches are to be added by increasing each two levels in the output voltage profile. A modified sinusoidal pulse width modulation (SPWM) technique is used to provide a low total harmonic distortion (THD) in the output voltage waveform, and the THD obtained without a filter is very low. THDs are measured in the load side with and without a filter. The suggested SPV system with a five-level inverter is linked to a specific load, and charge balance control is achieved via the proposed MLI topology with SPWM control scheme.