Analysis of single-stage three-phase DC–AC boost inverter for distributed generation system

Abstract

The increase in energy demand and reduction of greenhouse gas emission is pushing research interest towards distributed generation systems. Distributed generation systems are renewable, non-renewable energy sources and also energy storage devices. The single-stage three-phase boost inverter can provide higher value of sinusoidal AC output voltages from low-voltage DC sources without an intermediate DC–DC boost chopper. This unique property is absent in classical voltage source buck inverter which produces an instantaneous AC output voltage, which is always less than input DC voltage. Also, this topology is a suitable choice in many applications such as AC drives, uninterruptible power supplies (UPS) and distributed power generation scheme (grid integration of renewable sources). Thus, it has an advantage of boosting and inversion process in a single conversion stage, negligible shoot-through problem, reduced components, size and volume, low losses and higher efficiency, in comparison to double-stage conversion, which consists of a DC-to-DC boost converter and a conventional three-phase buck voltage source inverter in between the low-voltage DC sources and AC output. The three-phase DC-to-AC boost inverter can also be applied to storage devices such as batteries, fuel cells and supercapacitors with the grid. Working principle, operations, modelling and simulation of three-phase single-stage DC–AC boost inverter with battery as input are performed under Simulink platform of the MATLAB and different waveforms are plotted. These simulations explain the feasibility of the proposed single-stage three-phase boost inverter.