MODELING AND CONTROL OF ELECTROMECHANICAL SYSTEMSAcademic Year 2021/2022 - 1° Year
Credit Value: 9
Scientific field: ING-IND/32 - Power electronic converters, electrical machines and drives
Taught classes: 49 hours
Exercise: 15 hours
Laboratories: 25 hours
Term / Semester: 2°
The course aims to provide students with the fundamentals of modeling, operating principles and control of electrical and electromechanical energy conversion systems, the main basic knowledge and future developments. Experimental activities in laboratory sessions will receive much attention.
The knowledge acquired during the course will allow the knowledge of the operation of the most common electromechanical actuators and their control methods.
Knowledge and understanding
The student will acquire the knowledge of the operating principles and the main control methods of electrical machines. The main applications will be related to the fields of automation, electrical and electronic engineering.
Ability to apply knowledge and understanding
At the end of the course, students will have the necessary skills to analyze an electromechanical system, identifying its main sections and functions. Students will have the skills necessary for the characterization of systems and processes and for the design of electromechanical systems, with particular reference to modeling and control.
Autonomy of judgment
Students will acquire independent judgment for an accurate analysis of electromechanical systems, these skills will also be refined through experimental activities carried out in the laboratory.
The student will strengthen the technical language of electrical energy engineering with the aim of being able to adequately present himself to the world of work with adequate skills and an adequate technical profile. The ability to work in groups will be refined through the experimental experiences in the laboratory carried out in small groups. The drafting of the laboratory report and/or the oral exam will allow students to refine technical language and communication skills.
The student will be able to autonomously expand their knowledge on electromechanical conversion by deepening reference texts and papers in specialized scientific journals. The results of learning the concepts of the course are the knowledge of the operation of the most common electromechanical actuators and their most common control modes.
The training objectives are linked both to the acquisition of new knowledge, therefore frontal lessons as teaching method and tutorials to include the ability to apply the acquired knowledge through computer and/or laboratory exercises.
This year's teaching could be taught not only at University but in a mixed or remote way.
Should teaching be carried out in mixed mode or remotely, it may be necessary to introduce changes with respect to previous statements, in line with the programme planned and outlined in the syllabus.
Detailed Course Content
The objective of this course is modeling and control the electromechanical systems (mainly rotating electrical machines: conventional and special) used in the conversion of electrical in mechanical energy and vice-versa. The course will give basic and advanced elements of two fields of the electrical engineering area taught in the courses of Electrical Machines and Electrical Drives Emphasis is placed on electromagnetic rotating machinery, by means of which the bulk of this energy conversion takes place. However, the techniques developed are generally applicable to electrical machines, renewable energy conversion and to a wide range of additional devices including linear machines, actuators, and sensors.
Although not an electromechanical-energy-conversion device, the transformer is an important component to understand the overall energy-conversion process that uses magnetic field. The models developed for transformers analysis form the basis for the ensuing discussion of rotating electric machinery. Finally Generalized Theory and Space Vector Theory are introduced to better explain Vector Control of AC Machines.
Summary of the course program
First part: Electromechanical systems.
Energy balance and conservative systems: determination of electromagnetic forces and torques. Power: active, reactive and apparent power. Three-phase systems. General information on electrical machines: materials, losses, efficiency, thermal behavior. Transformer: principle of operation, equivalent circuit, no-load and short-circuit tests; HF transformers. Asynchronous machine: MMF of distributed windings and equations, pole pairs, equivalent circuit, slip, electromagnetic torque.
Second part: Rotating machines.
Asynchronous machine: no-load and locked-rotor tests, starting, single-phase induction motors. Power Electronics: Rectifiers, Choppers. Converters for DC and AC electrical machines. Control of electromechanical systems: Electrical drives. DC servo-machines: commutator action, load operation, DC motors, shunt excitation generators, series excitation motors. Digital modulation techniques: PWM, space vector. VSI and CSI. DC and AC motor drives: Scalar control. Current control. Constant V by f control. Vector Control of asynchronous machines: IFOC, DFOC: VI, I-omega, I-theta. Synchronous machine: equivalent circuit, load angle, synchronous and reluctance torque.
Third part: Special machines, SMART-GRIDs, MICRO-GRIDs.
Special synchronous machines: Permanent Magnet (PM) motors, Synchronous Reluctance (SyncRel) motors, stepper motors, switched reluctance motors, Brushless DC motors. Vector control of synchronous and PM machines. Universal motors. Stepper motors. Switched reluctance motor control. Distributed and renewable energy generation. Drives for electric traction, electric and hybrid vehicles.
A.E. Fitzgerarld: “Electric Machinery”, Mc Graw Hill.
P. Krause: “Analisys of Elelectrical Machines”, IEEE Press.
N. Mohan: "Power Electronics", Hoeply.
B. Bose: “Power Electronics and Variable Frequency Drives”, IEEE Press.
T. Wildi: “Electrical Machines, Drives and Power Systems”, Pearson Prentice Hall.