A Grid-Interactive Power Conversion System for Integrating the PV-Wind Energy Sources

In this article, various converters integrated with renewable sources to the utility grid along with its control strategies are proposed. The proposed system uses a buck–boost converter to extract maximum power from photovoltaic (PV) and maintain power balance between the system and utility grid through a voltage source converter (VSC) employing bidirectional power flow. The main feature of the buck–boost converter presented here is to boost the dc voltage of the load by integrating the PV and dc output of the VSC in series. Moreover, the boost converter is utilized to extract the maximum power from a wind source. Additionally, a voltage management scheme is proposed to achieve a regulated constant voltage magnitude higher than that of a conventional voltage source converter integrated with the utility grid. Besides, it can be realized using a conventional voltage source converter along with the existing renewable sources in the system. Finally, the proposed system is validated through simulation and experimental results under various operating conditions.