13D011EEF - Electrical drive as a efficient and high quality electrical energy consumer

Course specification
Course title Electrical drive as a efficient and high quality electrical energy consumer
Acronym 13D011EEF
Study programme Electrical Engineering and Computing
Module Power Converters and Drives
Type of study doctoral studies
Lecturer (for classes)
Lecturer/Associate (for practice)
    Lecturer/Associate (for OTC)
      ESPB 9.0 Status elective
      Condition none
      The goal Students are introduced with methods of consideration of Electrical drives as a conumer of electrical energy. Review of options for increase of the energy efficiency of electrical drive- in the design stage, during commissioning and by optimization of the process driven by the drive in consideration. Methods of analyses of the influence the drive has on the supply grid and means for mitigation of negative effects.
      The outcome The ability to analyze the electrical drive from the electrical energy consumer point of view, and aspects of the supply grid connection. Preparation and training for the analyses of energy efficiency of the electrical drive and the driven technological process as a whole.
      Contents of lectures Introduction. Electrical drive as a demanding consumer of electrical energy. Active and reactive power, distortion power. Review of the definitions of active and total reactive power. Instantaneous and effective values of power, power factor, displacement factor. Energy efficiency of a process. Importance and influence of the speed control to the energy efficiency. Energy efficiency of the components of the electrical drive: load (process), gear, motor, power converter. Losses in power converter and motor. Optimization of losses (flux optimization). Influence of the electrical drive to the supply grid – effects of load changes, dynamic regimes, energy recuperation (recovery). Review of rectifier modules for single and multi-motor drives. Analyses of influence of passive (diode), active (regenerative) and low harmonic rectifier modules to the power supply grid. Harmonic distortion of voltage and current. Typical methods for compensation of reactive power and higher order harmonics in plants where the dominant energy consumers are electrical drives. Active filters, principle of operation, dimensioning and selection, and analyses. Methods of measurement of power, energy, power factor, harmonic distortion in electrical drives.
      Contents of exercises Demonstration of energy savings potential in pump or fan applications of drives, performing of adequate measurements. Demonstration of energy savings potential in bulk material transport application of drives, performing of adequate measurements. Measurement of active, reactive and distortion power in controlled electrical drive with DC and induction motors. Regeneration of energy in electrical drives, experimental verification of effects on energy savings. Harmonic analysis of supply current of electrical drive. Demonstration of influence of constant speed (non-controlled) and controlled electrical drive to the power supply grid.
      1. F. Parasiliti, P. Bertoldi, eds. “Energy Efficiency in Motor Driven Systems”, Springer-Verlag, Berlin, 2003.
      2. B. Jeftenić, M.Bebić, S.Štatkić, „Multimotor drives“, Akademska misao, Belgrade, 2012.
      3. Vladan Vučković, „Electrical Drives“, Akademska misao, Belgrade, 1997.
      4. A. Sumper, A. Baggini, “Electrical Energy Efficiency: Technologies and Applications”, Wiley Online publishing, 2012.
      5. Industry applications magazine, Transactions on Industry Applications
      Number of hours per week during the semester/trimester/year
      Lectures Exercises OTC Study and Research Other classes
      Methods of teaching Lectures, demonstrations, presentations, practical measurements, etc.
      Knowledge score (maximum points 100)
      Pre obligations Points Final exam Points
      Activites during lectures 0 Test paper 0
      Practical lessons 10 Oral examination 50
      Colloquia 0
      Seminars 40