A Brief Review on State-of-the-art Grid-connected Inverters for Photovoltaic Applications

The most important issue in Photovoltaic (PV) systems is increasing of the total system efficiency. Since solar cells have a limited and low efficiency (about 20~30%), the most effective method to increase the total system efficiency is to enhance the efficiency of interface inverters. Hence, finding a proper inverter for these systems among various kinds of existed inverters is of utmost importance among PV systems designers. Many review papers have been published and tried to gather different kinds of grid-connected inverters. But, in this article a brief review of state-of-the-art, high-efficient, and grid-connected inverters have been gathered, discussed, and compared to each other. However, former reviews just focused on typical structures which are completely out-of-date. All of the structures reviewed in this article, are trying to increase efficiency by using different techniques and structures.