Modular Cascaded H-Bridge Multilevel Photovoltaic (Pv) Inverter For Three-Phase Grid-Connected Applications

Abstract

For three phase grid connected applications, PV mismatches may introduce unbalanced supplied power, leading to unbalanced grid current. To solve this issue, a MPPT control scheme with modulation Compensation is also proposed. This project presents a modular cascaded H-bridge multilevel photovoltaic (PV) inverter for single or three phase grid connected applications. The modular cascaded multilevel topology helps to improve the efficiency and flexibility of PV systems. To realize better utilization of PV modules and maximize the solar energy extraction, a distributed maximum power point tracking control scheme is applied to both single and three phase multilevel inverters, which allows independent control of each DC link voltage. A simulation three phase seven-level cascaded H-bridge inverter has been built utilizing nine H-bridge modules (three modules per phase).Each H-bridge module is connected to a 185W solar panel. Simulation results are presented to verify the feasibility of the proposed approach.