报告题目：Determining ZVS Soft Switching Boundaries for Dual Active Bridge DC-DC Converters using Frequency Domain Analysis
报 告 人：Prof Grahame Holmes (墨尔本大学，IEEE Fellow)
时间：2016年5月26日（星期四）上午09:30
地点：安徽大学磬苑校区理工A楼A102
主办单位：电气工程与自动化学院
欢迎各位老师、同学届时前往！
科学技术处
2016年5月24日
报告人简介：
Professor Holmes graduated from the University of Melbourne in 1974, and has a Masters degree in power systems engineering, and a PhD in PWM theory for power converters. For 26 year he was a faculty member at MonashUniversity, working in the area of Power Electronics, where he established the Power Electronics Research Group to support graduate students and research engineers working together on a mixture of theoretical and practical R&D projects. In 2010, Professor Holmes moved with his group to take up the position of Innovation Professor – Smart Energy Systems at RMITUniversity, allowing him to broaden his research activities into a diversity of applications of power electronics, including particularly Smart Grids and Smart Energy technologies.
Professor Holmes has a strong commitment and interest in the control and operation of electrical power converters. His research interests include fundamental modulation theory and its application to the operation of energy conversion systems, current regulators for drive systems and PWM rectifiers, active filter systems for the quality of supply improvement, resonant converters, current-source inverters for drive systems, and multilevel converters. He has made a significant contribution to the understanding of PWM theory through his publications and has developed close ties with the international research community in the area. He is a Fellow of the IEEE, has published over 200 papers at international conferences and in professional journals, and regularly reviews papers for all major IEEE transactions in his area. He has also coauthored a major reference textbook on PWM theory with Prof. Thomas Lipo of the University of Wisconsin-Madison. Prof. Holmes is an active member of the IEEE Industry Applications Society and the IEEE Power Electronics Society.
报告简介：
DualActiveBridge (DAB) converters offer an unmatched capability to transfer energy in either direction between two DC sources, while also providing galvanic isolation and high conversion efficiency. However, to operate at higher efficiencies, the bridges must operate with Zero-Voltage-Switching (ZVS) over as wide an operating range as possible. The conventional approach to determine ZVS operation uses time domain analysis with ideal AC coupling inductances, which only approximately identifies the ZVS boundaries. This seminar now presents a new approach using harmonic decomposition of the bridge switching patterns, which gives an explicit theoretical solution under all operating conditions, while also accommodating more complex AC coupling structures, practical impedance non-idealities, and the switching impact of dead-time and device capacitance. The methodology is confirmed by matching analytical predictions with experimental results for selected DAB systems.