MCPWM Based 21 Level Inverter Design for Grid Connected PV System

In this paper, a 21 level multi-sourced inverter with reduced switch, and component count is proposed. The proposed multilevel inverter (MLI) is asymmetrically switched to achieve maximum level from the planned cascaded topology. Multicarrier Pulse Width Modulation technique (MCPWM) is used as a control technique for the proposed inverter. As the inverter is asymmetrically switched, the switch logic for the proposed inverter is generated using Boolean expressions through logical implementation. The power quality, i.e., THD of the proposed inverter, is shown for different types of MCPWM methods such as PD, POD, and APOD for the resistive and inductive load as well. The proposed inverter has also been implemented through HIL (hardware in the loop) using the FPGA-based OPAL-RT module. As separate DC sources need to be used as input for the suggested topology, it can be utilized for renewable power generation, especially Grid-Connected PV System (GCPV).