A Comprehensive Review of Grid-Connected PV Systems Based on Impedance Source Inverter

The increase in linking photovoltaic (PV) power plants to utility grids are due to the world expansion in PV systems and its advantages of low running cost, renewable, etc. Although PV is now considered one of the main power sources in many countries, it has low efficiency. Therefore, the big issue to improve the efficiency is to enhance the interface inverters' efficiency. Different inverter topologies have been proposed to relate to the PV panels; each has advantages and disadvantages. These topologies can be classified into two-stage and single-stage (impedance network) inverters. Impedance network inverters overcome the problems of traditional inverters and seek to realize the advantages of a two-stage system and reduce the number of power conversions. However, to the authors' best knowledge, there is no comprehensive review of the applications of the impedance source inverter for the PV system, including the control techniques. Therefore, this paper reviewed the existing topologies by paying attention to four key research issues: 1) various impedance network inverters and discusses the main structures from the point of view of the PV application, 2) control techniques suitable for impedance source inverters, comparing them in terms of complexity and theoretical performance, 3) investigation into the most important control methods used to connect the inverter output current with the network voltage, and 4) Challenges and future direction. Finally, this paper is provided as a brief reference to help researchers choose the appropriate impedance source inverter topologies for their applications and the preferred control and modulation methods for this type.