IMPLEMENTATION OF SEVEN LEVEL INVERTER WITH REDUCED SWITCHES BASED GRID CONNECTED PV SYSTEM

Over the years, efficient renewable energy sources have become a dire need. Parallel, multilevel inverters have also been gaining traction for their applicability in solar applications as they provide transformer-less voltage control and allow even low voltage PV modules to be fed into the grid. But, PV integrated MLIs have low efficiency and Harmonic Distortion. To help tackle this issue, this project proposes the implementation of a reduced switch cascaded seven-level inverter with a grid-connected PV system. Using methods such as reducing the number of switches, RSCC and MSPWM. Reducing the number of switches enables us to reduce the switching losses as compared to a normal cascaded MLI. However, the reduced switch topology causes voltage division, to tackle this MSPWM is implemented to obtain optimum switching angles to minimize the harmonics and RSCC helps stabilise the voltage. This paper finds that reduced switch topology and MSPWM prove to be a better alternative for PV integrated systems, with higher efficiency and reduced harmonics.