A Study and Comprehensive Overview of Inverter Topologies for Grid-Connected Photovoltaic Systems (PVS)

摘要

Global environmental concerns and the advancements in power electronics technology leading the application of Photovoltaic Systems (PVS) in the distribution generation (DG). For generating electric power through the energy received from the Sun, solar PVS is an emerging technology. It is playing a key role to consume solar energy as much as possible. Electric power is generated by the PV array in form of DC. This DC power before utilization for domestic or industrial uses must be converted into AC. If the PVS is grid-connected then the inverter requires high efficiency, maximum power point tracking, total harmonic distortion of currents injected into the grid must have low and the power injected into the grid must be controlled. The employed control schemes decide the performance of the inverter which is connected to the grid. In this paper, all aspects related to grid-connected inverter are presented that includes historical evolution of the inverter topologies, standards and specifications, summary of inverter types, and classification of inverter topologies. Also, a discussion has been presented based on the number of power processing stages required in the system to fed electrical power into the grid.