- Docente: Luca Zarri
- Credits: 6
- SSD: ING-IND/32
- Language: English
- Teaching Mode: Traditional lectures
- Campus: Bologna
-
Corso:
Second cycle degree programme (LM) in
Electrical Energy Engineering (cod. 8611)
Also valid for Second cycle degree programme (LM) in Automation Engineering (cod. 8891)
Learning outcomes
The aim of the course is to provide a general approach to an understanding of the performance and control of electric machines and drives. After the course, the students are able to model and simulate dc motor drives, brushless motor drives and induction motor drives having clear knowledge of the physical aspects of electric machines behaviour when operating as motors and generators as well as the mathematical models of electric machines valid for steady-state and transient analysis.
Course contents
Advanced motors
- brushless motors with surface PM
- brushless motors with inner PM
- induction motors with squirrel cage rotor
- doubly-fed induction motors
Brushless AC motor drives
Dynamic model of permanent magnet synchronous machines with surface mounted magnets. The dq machine and flux equations. Principles of field orientation. Torque production and control. Dynamic model of permanent magnet synchronous machines with interior magnets. The dq machine and flux equations. Torque production and control. Control of the synchronous machine supplied by current controlled PWM inverter. Simulation of electromechanical transients. Maximum torque capability of the machine in the flux weakening region.
Induction motor drives
Analysis of induction motors based on steady-state machine model. Torque and machine equations. Steady-state characteristics. Starting of induction motors. Dynamic model of induction machines. The dq machine and flux equations. Torque equation. Principles of field orientation. Machine equations and torque in the rotor flux oriented reference frame. Decoupling control of flux and torque in the rotor flux oriented reference frame. Flux models. Direct scheme and indirect scheme of induction motor field oriented control. Control of the induction machine supplied by current controlled PWM inverter. Simulation of electromechanical transients. Maximum torque capability of the machine in the flux weakening region. Applications.
Elements of power electronics
-Space vectors
-Inverter with vector control
-Back-to-back converter
-Modulation strategies
-Active filters
-Fundamental of electric drives and power electronics converters for Smart Grid and renewable sources.
Current regulators for electric drives
- Synchronous PI regulators
- Resonant PI regulators
- Dead-beat control
- Repetitive control
Fundamentals of wind energy systems
- Structure of a wind turbine. Power of the wind. Power coefficient. Betz's limit. Maximum power point tracking. Speed control. Power control at high wind speed. Wind energy systems based on PM generators and induction generators.
Fundamentals of electric vehicles
- Structure of an electric and hybrid vehicle. Topologies of hybrid vehicles. Model of a tire. Simplified model of a vehicle.
Readings/Bibliography
A.E. FITZGERALD, C. KINGSLEY JR., A. KUSKO, Macchine Elettriche, Franco Angeli Editore, Milano, 1978.
JOHN M.D. MURPHY, F.G. TURNBULL, Power Electronic Control of AC Motors, Pergamon Press, Oxford, 1988.
TAKASHI KENJO, Stepping motors and their microprocessor controls, Clarendon Press, Oxford, 1985.
T.J.E. MILLER, Brushless permanent-magnet and reluctance motor drives, Clarendon Press, Oxford, 1989.
T.J.E. MILLER, Switched reluctance motor and their control, Clarendon Press, Oxford, 1989.
Teaching methods
The lessons are in ENGLISH!
Simulink models in the laboratory, and numerical exercises.
Assessment methods
The exam consists at least of two parts, i.e., a written test and the discussion of a Simulink project. The mark of the written test is in the range 0-30, whereas the mark of the project is usually in the range 0-3 (depending on the project complexity).
If a student is not satisfied by the mark of the written test, they can ask for an additional oral test, provided that the mark of the written exam is at least greater than 15. The oral exam takes about 1 hour and covers all topics of the course, including the Simulink project.
Teaching tools
All the slides of the course are available.
Links to further information
http://www.die.ing.unibo.it/automazione/
Office hours
See the website of Luca Zarri