Wide bandgap medium voltage power electronics and Grid-tied power electronics
Presenter: Dr. Srdjan Lukic - North Carolina State University
I) Wide bandgap medium voltage power electronics
Power electronic converters connected directly to the medium voltage (MV) distribution system can provide many benefits to the power grid and to the end user. A couple of interesting examples include back-to-back converters connected to solar farms and wind turbines, solid state transformers and electric vehicle (EV) fast charging stations. The state of the art silicon devices limit the efficiency and the overall performance of these power converters. Silicon carbide devices can replace the Si IGBTs, and can enable the MV power converters that are much more efficient and power dense than their silicon equivalents. In this work, we will review a couple of interesting applications of medium-voltage power electronics converters, and then focus on a few design iterations of MV EV fast chargers that the NCSU team is building, one using 1.2kV and another using 10kV SiC MOSFETs.
II) Grid-tied power electronics
With the wide adoption of inverter-interfaced distributed generation, and with the rise of the “prosumer”, a customer that can produce and sell locally generated electricity, the interactions between power converters is poised to offer great benefits, but also major challenges to the system operator, potentially affecting system stability. This talk will cover the components and devices, system architectures and controls, ancillary services and grid support, and customer interactions and benefits in the context of microgrids and networked power electronics based systems. This talk is organized into three parts: Part I provides a review of basic power electronics components in a modern power system; Part II presents system architecture, stability issues, primary and secondary control, grid synchronization techniques, and interconnection standards for DERs; Part III covers enabling communication technologies and advanced secondary control algorithms for microgrid control and mode transitions.