IEEE Logo Denver Chapter Of The
IEEE Power Electronic Society

Presentations And Downloads
About The Chapter

Next Meeting

Advanced Power Electronics and Motor Drives for Future Transportation Electrification

Prof. Sheldon S. Williamson, Concordia University, Montreal, Quebec, Canada

Thursday, 1 May 2014, 6:00 p.m.
University of Denver - Knudsen Hall
Room CMK 309
Denver, Colorado


Currently, the most promising and practical solution to sustainable transportation electrification lies in electric and plug-in hybrid electric vehicles (EVs/PHEVs). An EV/PHEV can reduce fuel consumption by charging its battery from the utility grid, or in the near future, from renewable energy sources (smart grid/micro-grid scenario). Typical battery charging time for EVs/PHEVs is 6-8 hours. The charging/discharging EV battery will have a huge impact on the utility. Alternatively, photovoltaic (PV) panels could be used for charging EVs during work hours or at home.

The presentation will initially review current as well as future charging methodologies for EV/PHEV batteries and energy storage systems. The presentation will discuss the modeling, sizing, design, and implementation of a high-efficiency, single-stage, PV-grid-based charging infrastructure for EVs/PHEVs. The novel, single-stage PV/grid charging infrastructure is universal in nature and smartly adaptable, whereby EV/PHEV batteries of different chemistries as well as charging rates can be accommodated in a single power conversion stage. The designed charging infrastructure can support both Level 1 as well as Level 2 EV/PHEV charging. According to SAE J1772 standards, DC charging of EVs can be performed at 200-450 V DC, 36 kW, and 80 A (DC Level 1), and up to 200 A, 90 kW (DC Level 2). This presentation will also focus on system-level aspects of EV charging. Futuristic PV/grid-based inductive and/or surface charging infrastructures will also be presented for EVs and PHEVs. Power electronic converter topologies and energy management systems for such an inductive/surface EV/PHEV charging infrastructure will be presented.

On-board EV/PHEV energy storage issues for batteries and ultra-capacitors will also be highlighted. Li-ion batteries, although popularly proposed, have been highly uneconomic for EV/PHEV energy storage, overshooting cost requirements by a large margin. Li-ion batteries provide a respectable solution for EV energy storage. However, main practical issues include: cycle life, calendar life, energy density, power density, and lately, safety. These issues can be addressed successfully by using a simple approach: a power electronic cell voltage equalizer. The purpose of the second part of this seminar is to demonstrate the role of power electronics intensive battery and ultra-capacitor energy management solutions, to reach the cost break-even point of an EV. The design and implementation of both inductor-based as well as switched capacitor DC/DC converters for Li-ion battery cell-equalization will be discussed. Finally, the design of a novel, cost-effective DC/DC converter for voltage equalization of EV/PHEV Li-ion battery cells will also be presented.

Advanced motor drives for EV propulsion will be introduced. An overview of applications of permanent magnet synchronous machines (PMSM), synchronous reluctance machines (SynRM), and switched reluctance machines (SRM) will be addressed. Advanced motor drive solutions for both PMSM, SynRM, and SRM will be presented. In addition, power electronic converter topologies for drive purposes as well as control algorithms for efficient performance will be discussed in detail for EV propulsion applications. This research seminar will be useful for engineers and managers with entry-level and/or medium-level knowledge of power electronics and motor drives. The talk would also be suitable for engineers with entry level knowledge of power electronics and motor drives applications towards energy storage systems, electric vehicles, and renewable energy systems.

About The Speaker

Sheldon S. Williamson (S'01-M'06-SM'13) received his Bachelor of Engineering (B.E.) degree in Electrical Engineering with high distinction from University of Mumbai, Mumbai, India, in 1999. He received the Master of Science (M.S.) degree in 2002, and the Doctor of Philosophy (Ph.D.) degree (with Honors) in 2006, both in Electrical Engineering, from the Illinois Institute of Technology, Chicago, IL, specializing in automotive power electronics and motor drives, at the Grainger Power Electronics and Motor Drives Laboratory. Dr. Williamson is an Associate Professor within the Department of Electrical and Computer Engineering, at Concordia University, Montreal, Canada, where he has been working since June 2006. His main research interests include the study and analysis of electric drive trains for electric, hybrid electric, plug-in hybrid electric, and fuel cell vehicles. His research interests also include modeling, analysis, design, and control of power electronic converters and motor drives for land, sea, air, and space vehicles, as well as the power electronic interface and control of renewable energy systems.

Meeting Details

The meeting will start at 6:00 p.m. with pizza, soft drinks, and the chance to network with your fellow power electronics professionals from the Front Range area. A few business items for Denver PELS will be discussed starting at 6:30 pm and the main technical presentation will start at 7:00 p.m.

Please forward this meeting announcement to anyone you think might be interested. You do not have to be an IEEE member to attend. We welcome any interested person.

If possible, to help us plan the right amount of food and drinks, please RSVP by sending a message to and letting us know if you are coming.

If you aren't able to RSVP, no problem, please come anyway!

Directions And Parking

The meeting will be held in Room CMK 309 of Knudsen Hall on the University of Denver Campus. Knudsen Hall is located at the corner of S. York St. and E. Wesley St. in Denver, CO. Click here for a map of the area.

The best parking is probably in the parking garage next to Knudsen Hall (Parking Area 320). Visitors are allowed to park in this lot but a hourly rate will most likely apply. Click here for a parking map of DU.

If other parking options are found they will be communicated in future announcements. The parking fee will be a small price to pay to attend the meeting and hear a distinguished lecturer!

Future Meetings

To Be Announced

Site Maintained by: Bob White, Denver PELS Chapter Webmaster
Original: 11 October 2006, Modified: 10 April 2014