Fuzzy Based Switched Boost Inverter for Microgrid Applications

Renewable energy sources (RES) place main role in present days to generate power. The Switched Boost Inverter is a single stage dc-ac power converter, whose output voltage can be either greater or less than its input dc voltage. This converter can supply both dc and ac loads, simultaneously, which makes it suitable for micro grid applications. Also, this converter allows shoot-through of the inverter legs without causing any damage to the converter. In this paper, the principle of operation of the Switched Boost Inverter is explained in detail and the expression for its conversion ratio is derived. Also, a Pulse Width Modulation (PWM) control strategy for the Switched Boost Inverter is formulated and implemented using a simple analog circuit. The harmonics spectrum of the inverter's output voltage with the proposed PWM technique is plotted and compared with that of a traditional voltage source inverter (VSI). Z-Source inverters have recently been proposed as an alternative power conversion concept as they have both voltage buck and boost capabilities. These inverters use a unique impedance network, coupled between the power source and converter circuit, to provide both voltage buck and boost properties, which cannot be achieved with conventional voltage-source and current-source inverters. Fuzzy controller is the best controller compare to PI controller and fuzzy controller is fast response and steady state response time also very less compare with PI controller that reason we use PI replace with fuzzy controller. In this work PV as the input source and the PI placed with fuzzy controller in switched boost inverter is applied to a Microgrid system. The simulations results are obtained by MATLAB/SIMULINK software.