SiC-Enabled Medium Voltage Isolated DC-DC Converter based Power Optimizer for Large Photovoltaic Parks

Reduction in the Levelized Cost of Energy (LCOE) can drive the widespread adoption of the PV and can contribute to sustainable development. Large scale PV parks are gaining popularity, thanks to its low LCOE compared to the commercial and residential scale PV. Further, LCOE reduction can be achieved by migrating from the low voltage AC to the Medium Voltage (MV) DC collection network. A re-configurable Two-stage boost LLC resonant converter is proposed for the MVDC integration of large PV parks. Detailed analytical loss models of the semiconductor devices and magnetic components have been developed, and multi-objective optimization has been performed to obtain losses and volume optimized design. A 7kV, 25kW converter is developed to validate the analysis.