PERFORMANCE ANALYSIS OF TRANSFORMER-LESS INVERTER FOR SOLAR POWER CONVERSION

Abstract

Solar energy is the most emerging renewable energy. Applications of solar energy are increasing for both gird connected and standalone system. Much more efforts have been made on the integration of renewable energies in to the grid in order to meet the imperative demand of a clean and reliable electricity. The PV inverter is the key element of grid-connected PV power systems. The main function is to convert the DC power generated by PV panels into grid-synchronized AC power. It is also used to supply to the grid. That’s why they are becoming much popular than others. In this thesis, solar system is designed by using grid connected transformer-less inerter structure for single phase in single stage. There is a strong trend in the photovoltaic inverter technology to use transformer less topologies in order to acquire higher efficiencies combining with very low ground leakage current. MPPT being the essential part of solar photovoltaic system is simulated using Perturb & Observe technique. A Heric DC-AC converter is employed to achieve this goal. Heric inverter is used for reducing the leakage current in the transformer-less inverter structure in the grid connected PV system.