Philip T. Krein教授：
Samples of Nonlinear Control Possibilities in Switching Converters
Power electronic systems in their most general form are large-signal nonlinear systems controlled exclusively by the times at which switch operations occur. At a fundamental level, control action and optimization in power converters must be directed at the timing itself. This talk presents nonlinear control opportunities in terms of switch timing. Many existing converter controls are limited by the models used to represent the system. This talk explores control strategies that avoid typical model limitations and yield realistic fast methods for power converters. There is discussion exploring whether it is ever feasible to solve the most general problem: find a specific set of switch timings that optimize performance in some specified way. Following this, a few example problems and methods are identified, including fundamental results related to sampling theory. A direct geometric approach based on energy is used to show how to eliminate some disturbance effects as quickly as possible -- essentially cancelling them entirely. Alternative switching boundary approaches are shown that can deliver fast large-signal transients. The presentation shows that we can expect much higher levels of performance from many classes of switching power converters based on nonlinear controls.
Philip T. Krein received the Ph.D. degree in electrical engineering from the University of Illinois, Urbana. He was an engineer with Tektronix in Beaverton, Oregon, and then returned to the University of Illinois. At present, he holds the Grainger Endowed Emeritus Chair in Electric Machinery and Electromechanics and is Director of the Grainger Center for Electric Machinery and Electromechanics. He is also Executive Dean of the joint Zhejiang University-University of Illinois Institute in Haining, Zhejiang. His research interests address all aspects of power electronics, machines, drives, electric transportation, and electrical energy, with emphasis on nonlinear control approaches. In 2001, he helped initiate the International Future Energy Challenge, a major student competition involving fuel cell power conversion and energy efficiency. He holds thirty-seven U.S. patents with additional patents pending.
Dr. Krein is a Fellow of the IEEE, and in 2003 received the IEEE William E. Newell Award in Power Electronics. He was a founder and Director of SolarBridge Technologies, Inc., a developer of long-life integrated inverters for solar energy. He is a past President of the IEEE Power Electronics Society. He was elected to the U.S. National Academy of Engineering in 2016.