Research Areas

• Ocean Wave Energy.
• Power Electronics: Converters, Multi-Level Inverters, Power Supplies.
• Power Quality: Clean Power Converters, Power Quality Compensators, Active Filters, Power System Interface, System Compatibility.
• Adjustable Speed Drives (ASDs): ASD Ride-Through, Investigating and Mitigating the Adverse Effects of Applying ASDs to AC Motors (Over-Voltages, Bearing Currents, EMI).

Research Description
For wave energy, I have been pursuing three thrust areas: 1) researching novel direct-drive wave energy generators, 2) developing an action plan for a National Wave Energy Research and Demonstration Center in Oregon, and 3) working closely with the Oregon Department of Energy (ODOE) and a variety of stakeholders to promote Oregon as the optimal location for the nation’s first commercial wave parks.

My Power Electronics research has included power supply/converter designs for a wide power range, from micro-watt power conditioning circuits derived from piezoelectric generators, to 150W computer-based power supplies, to high power multilevel Inverters for ship-based power systems as well as the interface of renewables to the grid. To ensure system compatibility between converters and the power distribution systems and loads, I have also investigated several passive, active and hybrid filtering approaches and Power Quality Compensators.

The application of Adjustable Speed Drives (ASDs) in industrial, commercial and residential systems continues to increase due to improved efficiency and process control. I have conducted extensive research on ASD application issues to ensure continuous operation in the areas of ASD ride-through and investigating and mitigating the adverse effects of applying ASDs to AC Motors (Over-Voltages, Bearing Currents, and EMI).

Applications of Research
Research in Power Electronics has a wide range of applications from power supply converters in cell phones, laptops and advanced vehicle technologies (fuel cell, hybrid and electric), to industrial processes and military needs (e.g. the all-electric ship), and the interface of renewables to the grid.