Single Phase Multilevel Inverter for Standalone PV system Application

Abstract

The main application of MLI is for motor, adjustable drives, distributed generation, hybrid system, and microgrid. The usual H-bridge inverter topology has some issues like it cannot produce multiple voltage levels, high switching losses, harmonics, voltage stress is high. Later on, multilevel inverter overcame this problem. The MLI requires a large number of diodes, capacitors, switches, and sources to produce multilevel output. The proposed work presents the modified multilevel inverter for standalone PV system applications. It generates 5-level output using less number of switches. As a result, the complexity issue of cascaded MLI is overcome. The THD factor is also lowered by the implementation of the SPWM technique of carrier frequency 10 kHz and reference signal of 50Hz. The DC Source required for MLI is given from the boost converter, which generates multiple output. In the first part, the simulation of a boost converter the key feature of this converter is that it produces two outputs of the same voltage rating. In the second part 5-level multilevel inverter using six switches, two sources. The converters are simulated in MATLAB software.