Boroyevich elected to NAE | 2014 ECE Annual Report | ECE | Virginia Tech


Boroyevich elected to NAE | 2014 ECE Annual Report

Dushan Boroyevich

Dushan Boroyevich is the fourth ECE faculty member to achieve this honor, joining Fred C. Lee, Arun Phadke, and James S. Thorp.

Dushan Boroyevich, the American Electric Power Professor of Electrical and Computer Engineering, has been elected to the National Academy of Engineering.

Election to the National Academy of Engineering is among the highest professional distinctions awarded to engineers. Inductees are honored for contributions to research, practice, or education, and for developing new fields of technology and other major advancements in the field of engineering. There are a total 2,250 U.S. members of the academy.

"I am honored and humbled," Boroyevich says of his election to the academy. He believes that the distinction is a tribute to Virginia Tech, the College of Engineering, the Department of Electrical and Computer Engineering, and his mentors. This country and the Virginia Tech community, he says, were welcoming and supportive, "when I came from some god forsaken' country (Yugoslavia) to study for a Ph.D. under Fred Lee's supervision and again, when I came back from the war-riven' country to become a professor."

Power conditioning for systems on the move

Engineers use power electronics technology to convert electricity between ac and dc, and to change the voltage and frequency as needed for applications ranging from milliwatt consumer electronic devices to gigawatt systems. Dushan Boroyevich has spent most of his career at the larger end of the spectrum, predominantly working with autonomous electric power systems in airplanes, automobiles, ships, and trains.

Transportation systems must carry their power sources and fuel wherever they go, so manufacturers are constantly seeking ways to improve efficiency and reliability. This leads to reduced need for redundancy, lighter loads, less fuel consumption and ultimately, lower costs and lower environmental impact. At the same time, passenger demands have increased, particularly regarding power for multiple devices and much higher comfort expectations.

As a result, the past few decades have seen an explosion in the complexity of the autonomous power systems. "In the past, ships and planes had electro-mechanical switches to direct the electricity from the sources, down the cables, to the energy-consuming devices (loads). But today's distributed systems have many sources and many different load requirementseach one requiring a power electronic converter to optimize its own performance and efficieny," says Boroyevich. "Recently, there has been a growing focus on also optimizing the power distribution system between the sources and loads by reducing the size and weight of the wiring and eliminating the electro-mechanical switchgear. That's where much of my work has been," he adds. By optimizing the whole power system, less wiring is required, reducing still more bulk and weight while increasing the system energy efficiency.

Specialties in system control and power density

Dushan Boroyevich

Boroyevich says he does his best thinking when consulting with students.

Boroyevich has concentrated most of his research on power electronics system control and power density. The control problems relate to the interactions between the power converters that control the flow of electricity. "How do all these converters work with each other" he asks. "You have the converters optimizing the sources and loads and the converters optimizing the use of the wires. These are all electronic boxes' and they all think they are smart." Problems can arise when a "smart" converter shuts down the whole power system because of a local variance. Another big issue is that these electronic boxes operate internally at high frequencies, which inadvertently generate signals that may propagate through the power system, and can cause each other to malfunction (due to electromagnetic interferenceEMI).

Power density is also a big factor in mobile power electronics systems. Any change made to a system must weigh less than what it's replacing, according to Boroyevich, who first got involved in power converter packaging in the mid 1990s. "With power electronics, the whole system can be smaller if we design it properly, in an integrated way," he says. "The challenge is how do we make the converters as small as possible without sacrificing reliability, efficiency, and manufacturability"

The answers rely on continuous collaboration with mechanical engineers and materials scientists. It's an ongoing challenge, he says.

Meeting society's energy challenges

Boroyevich enjoys working on the tough interdisciplinary problems and working in a research group that tackles such broad applications as does CPES. Other research teams in the center work on lower power applications like cell phones, computers, data centers, and consumer electronics, while still others work on the underlying basic technologies such as circuits, components, and their integration. The different perspectives are beneficial, he says. "Our ideas and approaches are similar, but our constraints differ."

Another difference is that high-power applications traditionally evolved from ac power sources, whereas many low-power applications are dc-based. The growing integration of power electronics technology has enabled ac and dc to be used for best efficiency instead of being determined by the source. "This whole question of Tesla vs. Edison and who won is of no practical significance today," Boroyevich says. "They ere both correct." And now the technology exists to use both forms to their best advantage, he says, by using high-frequency ac within converters and dc for interconnecting them.

Generating and using electricity as sustainably as possible is critical, according to Boroyevich. "I believe that energy is the next big challenge for humanity." He says that electricity is the cleanest, most environmentally friendly, and least-prone-to-disaster form of energy for distribution and consumption, but that today's 100-year-old power grid technology is not up to the task. Today's autonomous power systems, especially planes, cars, ships, and trains, can serve as a guide for national energy grids and larger systems, he says.

"Why would we think our power grid will be the same in 50 years as it is today We have shown in transportation that we can throw out 150 years of railroad technology in favor of the individualistic automobile." Perhaps we will be just as bold with energy production and transmission.

Virginia Tech to be university partner in semiconductor innovation institute

ECE will receive $3 million over a five-year period to lead power electronics research and application development for the Clean Energy Manufacturing Innovation Institute.

ECE honors

Many ECE faculty members have been honored with fellowships and awards from major technical societies.

Dushan Boroyevich:
A research power

Boroyevich, co-director of the Center for Power Electronics Systems (CPES), is being honored for his contributions in control, modeling, and design of electronic power conversion for electric energy and transportation.

His research has focused on multi-phase power conversion, electronic power distribution systems, modeling and control, and design optimization. His comprehensive geometric approach to modeling and control of high-frequency switching power converters is now widely used for power conversion systems.

Research productivity

He has advised more than 84 doctoral and master's students at Virginia Tech, and co-authored with them over 650 technical publications. He has participated in 100+ sponsored research projects at Virginia Tech with his share of funding exceeding $16 million.

Honors and awards

Boroyevich is an IEEE Fellow, a recipient of the William E. Newell Power Electronics Technical Field Award, and apast President of the Power Electronics Society. He received the Award for Outstanding Achievements and Service to Profession from the European Power Electronics and Motion Control Council, six prize paper awards, and several research and teaching awards.

Academic background

Boroyevich received his bachelor's degree from the University of Belgrade in 1976 and an MSEE from the University of Novi Sad in 1982, both in the former country of Yugoslavia, now Serbia. From 1976 to 1982, he was an instructor at Novi Sad, working to establish its electronics program. He came to Virginia Tech for his Ph.D. in EE, studying with Fred Lee, under a General Electric fellowship. In 1986, he returned to Novi Sad as an assistant professor and founded the university's power and industrial electronics program.

A Virginia Tech professor

In 1990, he returned to Virginia Tech as an associate professor, working with Lee in the Virginia Power Electronics Center (VPEC). In 1998, Lee, Boroyevich, and faculty from Virginia Tech, the University of Wisconsin-Madison, Rensselaer Polytechnic Institute, University of Puerto Rico-Mayaguez, and North Carolina A&T State University formed the Center for Power Electronics Systems (CPES), the first NSF engineering research center in the area of power electronics.