Dynamic modelling and control of electromechanical converters

lelec2313  2020-2021  Louvain-la-Neuve

Dynamic modelling and control of electromechanical converters
Due to the COVID-19 crisis, the information below is subject to change, in particular that concerning the teaching mode (presential, distance or in a comodal or hybrid format).
5 credits
30.0 h + 30.0 h
Q1
Language
English
Prerequisites
Students are expected to master the following skills: basic knowledge in electrical machines and linear control, as they are covered within the courses LELEC1310 and LINMA1510
Main themes
  • Dynamic models of DC machines
  • Dynamic models of synchronous machines
  • Dynamic models of asynchronous machines
  • Space phasors and variable transformations (Concordia, Park and Clarke)
  • Control of DC machines
  • Vector and scalar control of asynchronous machines
  • Vector control of synchronous machines
Aims

At the end of this learning unit, the student is able to :

1 With respect to the AA referring system defined for the Master in Electrical Engineering, the course contributes to the develoopment, mastery and assessment of the following skills :
  • AA1.1, AA1.2, AA1.3
  • AA3.3
  • AA5.6
Specific learning outcomes of the course
At the end of the course, the student will be able to :
- Derive the dynamic model of electromechanical converters (DC and brushless DC machines, synchronous and asynchronous machines) in order to control them, in particular by exploiting the variable transformations (Concordia, Park and Clarke).
- Describe the main control strategies of these converters (scalar V/f control of asynchronous machines, vector and direct torque control for asynchronous and synchronous machines) and choose them according to the application.
- Use the adapted dynamic models in order to simulate the dynamic behaviour of these converters
- Use the adapted dynamic models in order to synthesize type P, PI or PID controllers.
- Use the adapted dynamic models in order to check the robustness and performance of a controller regarding modelling simplifications, external disturbances, changes in the machine parameters, ...
 
Content
- Introduction (1 hour): motivations, types of models, general structure of an electrical drive system, factors of development of electrical drive systems
- DC machine model (2h): structure of the machine; excitation mode, dynamic equations in the time domain and in the Laplace domain; model simplifications (mechanical, electrical and electromechanical time constants); model improvements (armature resistance, saturation)
- Space phasors and variable transformations (2 hour): Concordia Clarke and Park transformations
- Synchronous machine model (4h): equations of the machine in 'abc', 'aß' and 'dq' coordinate systems; round rotor and salient pole machines; particularization to permanent magnet machines
- Asynchronous machine model (4h): equations of the machine in 'abc', 'aß' and 'dq' coordinate systems
- DC machine control (2h): general principle, main types of power supply, control with emf compensation, control with and without current measurement for low power machines
- Synchronous machine control (4h): general principle of vector control in the 'dq' coordinate system; control with emf compensation, taking into account the inverter and the digital controller; flux weakening; particularization to surface mounted and interior permanent magnet machines, salient pole and wound inductor machines; brushless DC machines
- Asynchronous machine control (4h): equations in the rotor flux coordinate system; general principle of vector control in this coordinate system; vector control with emf compensation; scalar V/f control
Teaching methods

Due to the COVID-19 crisis, the information in this section is particularly likely to change.

Teaching is organized in the form of:
- Lectures;
- Homework on modelling and control of the various electromechanical converters seen during the lectures.
The homework are performed in groups of 2 or 3 students and lead to a synthesis report, which is evaluated and is involved in the final evaluation of the course.
Due to health constraints, the lectures will be organized simultaneously face-to-face for some of the participants and remotely (using a web conferencing tool) for the other ones. Details are provided on the Mooldle platform.
The practical work sessions (consulting sessions for the homework as well as laboratory sessions) will, in principle, be organized face-to-face. Details will also be provided on Moodle.
Evaluation methods

Due to the COVID-19 crisis, the information in this section is particularly likely to change.

The final grade is based on:
- the grades obtained for the homework reports done in groups during the semester,
- the grade obtained for an oral exam (closed book) dealing with all the topics of the course.
Depending on the health situation, the exam could be a remote one with adapted modalities.
Other information
Concerning the homework:
- Supervised sessions are organized weekly in a computer classroom
- The software used is Matlab/Simulink
Bibliography
- Transparents, livres de référence accessibles en ligne via l'intranet de l'UCL :
  • Wach, P., Dynamics and control of electrical drives, Springer, 2011, 456 p.
  • Veltman, A., Pulle, D. W., De Doncker, R. W., Fundamentals of electrical drives, Springer, 2007, 346 p.
  • De Doncker, R. W., Pulle, D. W., Veltman, A., Advanced electrical drives: Analysis, Modeling, Control, Springer, 2011, 462 p.
Faculty or entity
Force majeure
Evaluation methods
The final grade is based on:
  • the grades obtained for the homework reports done in groups during the semester,
  • the grade obtained for a closed-book oral exam dealing with all the topics of the course.
By default, the examination is organised in face-to-face. However, it can be organised remotely via, for example, the Teams platform:
  • for all students, if required by the health situation.
  • for students who, prior to the examination, can prove that they are unable to take part in the examination on site, as attested by a certificate of quarantine or a 'return form' from the SPF Foreign Affairs.


Programmes / formations proposant cette unité d'enseignement (UE)

Title of the programme
Sigle
Credits
Prerequisites
Aims
Master [120] in Electrical Engineering

Master [120] in Electro-mechanical Engineering