Plenary Lecture
The Impact of Reactive Power on Energy Efficiency in Electric Drives
Professor Slobodan Mirchevski
Faculty of Electrical Engineering and Information Technologies
Department of Electric Drives
University Ss. Cyril and Methodius
Skopje, FYROM
E-mail: mirceslo@feit.ukim.edu.mk
Abstract: In the lecture a look at reactive power in energy efficiency of electric drives is taken. Usually in energy efficiency of electric drives is treated only efficiency η of working machine, motor and power converter. Induction motor, as the most used in industry, has been considered. The influence of induction motor and power converter for its supplying in consumption of reactive power and disturbance power is evaluated. The starting investigations in the elevators adjustable speed drives have demonstrated that reactive and disturbance power consumption is at least 40 % of the active power consumption. It generally means that except benefits of power electronics using for adjustable speed drives, new problems are generating in the producing, transferring, distributing and using of electric energy.
Brief Biography of the Speaker: Slobodan Angel Mirchevski has received the B.Sc. degree in electrical engineering, M.Sc. degree and Ph.D. degree from University "Ss. Cyril and Methodius"-Skopje, in 1975, 1984 and 1990 respectively. From 1975-79 he was with Mines and Steelworks "Skopje" in rolling mills departments. From 1979 to the present he is with Faculty of Electrical Engineering and Information Technologies in Skopje. Since 2000 he is a full professor for electrical drives and a head of Laboratory for electric drives. He is an author of more than 150 scientific and professional papers and many application works (more than 50) in industry. Since 2002 has a title Senior Member of IEEE. He is a supervisor of 102 diploma works, 8 M.Sc. works and 2 PhD theses. His areas of interest are electric drives and energy efficiency. Now he is a member of PEMC Council, EPE Executive Council and EPE General Assembly. He was a general chairman of conference EPE-PEMC 2010, held in Ohrid.