Desing of highly efficent grid-connected inverter for renewable energy systems

Nowadays, with population growing and industry development, energy consumption is increasing and consequently, limited fossil fuel reserves which have serious and environmental concerns are depleted. Because of these reasons, the interest for clean and renewable energy sources, such as wind and photovoltaic, is growing. To utilize these energies, inverters are used to convert from DC form to AC form. Inverters are used in variety of structures, but grid-connected inverters are often preferred because of the cost of energy storage such as batteries. While the studies on inverters have increased recently, the efficiency of inverters has become matter of interest and been increased. In this study, implementation of grid-connected, highly efficient inverter for renewable energy systems are aimed. With these objectives, it is intended to contribute the development and expansion of renewable energy systems. In light of these objectives, variety of inverter topologies is examined and the popular type AT-NPC for grid-connected operation is designed and experimentally performed. The experimental results show that the inverter works with high efficiency and is well synchronized with the utility grid.