CONTROL OF TRANSFORMERLESS INVERTER FOR A PV SYSTEM USING FUZZY LOGIC AND FRACTIONAL CONTROLLER

Abstract

In the near future, the increase in fuel price and environmental constraints give more opportu nities in favour of utilising renewable energy like solar. The integration of renewable energy source into a micro grid can cause impacts on grid operation. A new device called a smart inverter can aid in the integration of solar energy and other dispersed energy sources into the electrical grid. Here, a smart inverter with a single phase power supply is developed. In addition to supplying power to utility loads and local loads, SPV-SSI may inject power into the grid and store energy in lead acid batteries. The complete design of boost converter and bi-directional buck boost converter is presented here. More over fuzzy PI and fuzzy SMC is designed and fractional order PI controller is also used. Fuzzy PI and fuzzy SMC perform better and are more stable than traditionally tuned PI controllers, demonstrating the effectiveness of the sys tem when utilising these controllers