High-Voltage, Highly-Efficient, Power-Dense Electronic Converter Using Silicon Carbide and AC-link

Ocean and hydropower generators face unique problems with respect to the transmission of power to shore and integration with the electric grid. The evolution of grid-integration standards usually requires the need for power electronics, which face unique form-factor and environment challenges in undersea applications. There is a need for advanced high-power electronic converters that are small and water-cooled, and can be efficiently and cost-effectively tied in to high-voltage transmission lines. This project will develop a high-power converter that uses silicon carbide devices enabled by an AC-link circuit design. The power converter will have a much higher power-density and allow direct connection to 12 kV or higher power lines without a transformer. This concept will drastically reduce the space and logistics requirements for the power electronics in ocean and hydropower systems, and increase the efficiency of transmitting power and interconnecting with the utility grid. Commercial Applications and other Benefits as described by the awardee: The integration of variable ocean and hydro resources with the utility grid will become a critical issue as more resources are brought on-line. A more cost effective, more efficient power converter should benefit many emerging hydro and ocean power generation technologies. The converter also should find use in other grid-tied distributed applications, including wind turbines, where size and weight are important factors.