2014年电气论坛第26次活动-Computational Techniques for the Evaluation and Optimization of Electromagnetic Interference Levels in Multi Component Systems

主讲人：Professor Osama A. Mohammed

Energy Systems Research Laboratory

Department of Electrical and Computer Engineering

Florida International University

Miami, Florida USA

mohammed@fiu.edu

http://www.energy.fiu.edu

时间：2014年10月27日 14:00-16:00

地点：浙江大学玉泉校区教二405

Detailed physics based computational electromagnetic field models of multi component energy systems enable the evaluation of realistic waveforms of voltages and currents for low and high frequency operation. These models also enable inclusion of practical effects such as parasitic elements, leakage saturation, and switching patterns during the system operation. This is essential for studying signatures from individual components and connected systems which is necessary during the design stage. These models also enable the evaluation of conducted and radiated electromagnetic fields in machinery, cables and power converters used in multi component energy systems. The models enhance our ability to determine their signatures and EMI interactions as well as evaluate the effectiveness of connecting controllers and/or other components.

Including detailed physical parameters such as geometrical features, material and thermal models in addition to their variation during their dynamic operation, yields the satisfaction of accurate levels of design objectives which can prove to be useful in devising mitigation strategies such as attenuators and shields. These studies are necessary for product design and for the product to be compliant from EMC point of view.

In multi-scale multi-component system, a number of active and passive components exist and are responsible for the production of unwanted ground currents. The paths to ground allow low and high frequency currents to close a loop between the components. Grounded connection points form paths through high frequency ground capacitors. This current flow between grounding points, of the various components, occurs due to the unbalancing of loading conditions, inter-component fault condition, switching activities and associated harmonics. The high frequency portion of the current due to switching devices couples the control circuits through low-voltage low-current elements and negatively affects the operation of the system.

From an electromagnetic signature point of view, the low and high frequency currents form loops passing this current and the resulting electromagnetic field will radiate in the surrounding environment. Any current loop with either DC or AC currents in the operational system will cause signature issues. If the amplitude of current is large enough to produce detectable field, the signatures must be evaluated for specific applications in order to develop mitigation strategies.

In this presentation, we will show modeling details and procedures to quantify signatures and EMI of actual physical components in several practical examples.

Biographical Sketch of Professor Osama A. Mohammed

Dr. Mohammed is a Professor of Electrical Engineering and is the Director of the Energy Systems Research Laboratory at Florida International University, Miami, Florida. He received his Master and Doctoral degrees in Electrical Engineering from Virginia Tech in 1981 and 1983, respectively. He has performed research on various topics in power and energy systems in addition to computational electromagnetics and design optimization in electric machines, electric drive systems and other low frequency environments. He performed multiple research projects for several Federal agencies since 1990’s dealing with; power system analysis, physics based modeling, electromagnetic signature, sensorless control, electric machinery, high frequency switching, electromagnetic Interference and ship power systems modeling and analysis. Professor Mohammed has currently active research programs in a number of these areas.

Professor Mohammed is a world renowned leader in electrical energy systems and computational electromagnetics. He has published more than 400 articles in refereed journals and other IEEE refereed International conference records. Professor Mohammed is an elected Fellow of IEEE and is an elected Fellow of the Applied Computational Electromagnetic Society. Professor Mohammed is the recipient of the prestigious IEEE Power and Energy Society Cyril Veinott electromechanical energy conversion award and the 2012 outstanding research award from Florida International University. He is a Co-author of book entitled “Modern Technologies in Energy Efficiency Improvement – Design, Control, Implementation, and Applications”, Scholar Press, 2013 and also an author of several book chapters including; Chapter 8 on direct current machines in the Standard Handbook for Electrical Engineers several in editions including the 16th Edition, McGraw-Hill, 2007 and 2012. Also the author of the book Chapter entitled " Optimal Design of Magnetostatic Devices: the genetic Algorithm Approach and System Optimization Strategies," in the Book entitled: Electromagnetic Optimization by Genetic Algorithms, John Wiley & Sons, 1999.

Professor Mohammed has lectured extensively with invited and plenary talks at major research and industrial organizations worldwide. He serves as editor of several IEEE Transactions including the IEEE Transactions on Energy Conversion, the IEEE Transactions on Smart Grid, IEEE Transactions on Magnetics, IEEE Transactions on Industry Applications, COMPEL and the IEEE Power Engineering Letters. Professor Mohammed served as the International Steering Committee Chair for the IEEE International Electric Machines and Drives Conference (IEMDC) and the IEEE Biannual Conference on Electromagnetic Field Computation (CEFC). Professor Mohammed was the General Chair of the 2009 IEEE IEMDC conference held in Miami Florida, May 3-6 2009 and was the Editorial Board Chairman for the IEEE CEFC2010 held in Chicago, IL USA, May 9-12, 2010. Professor Mohammed was also the general chair of the IEEE CEFC 2006 held in Miami, Florida, April 30 – May 3, 2006. He was also general chair of the 19th annual Conference of the Applied Computational Electromagnetic Society ACES-2006 held in Miami, Florida March 14-17, 2006 and was a co-general chair for the same conference, ACES-2012 in Monterey California. Professor Mohammed was the General Chairman of the 1993 COMPUMAG International Conference and was also the General Chairman of the 1996 IEEE International Conference on Intelligent Systems Applications to Power Systems (ISAP'96). Dr. Mohammed has chaired the Electric Machinery Committee for IEEE PES was the Vice Chair and Technical Committee Program Chair for the IEEE PES Electric Machinery Committee for a number of years. He was a member of the IEEE/Power Engineering Society Governing Board (1992-1996) and was the Chairman of the IEEE Power Engineering Society Constitution and Bylaws committee. He also serves as chairman, officer or as an active member on several IEEE PES committees, sub-committees and technical working groups.

For complete list of publications, the following link has all the details; http://www.energy.fiu.edu/contact/

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