OVERVIEW

The course offers the needed knowledge for the study and development of advanced control systems for electrical systems, with particular reference to electronic power converters and to electrical drives, to guarantee the efficient transformation of electrical energy in the various forms required, in a very high power range, from the mW required for mobile phone operation to the tens of MW required for the operation of large naval electric motors.

AIMS AND CONTENT

LEARNING OUTCOMES

The essential parts of the modern theory of automatic controls for advanced applications are developed, which today can be implemented owing to the help of the means offered by current electronic and computer technology. These concepts are used for the study and development of high performance control systems for power electronic converters and for electrical drives.

AIMS AND LEARNING OUTCOMES

The course develops the essential parts of the modern theory of automatic controls, rich in mathematical contents, suitable for the correct formulation and rigorous treatment of even complex problems, and capable of ambitious applications with the help of the means offered by current electronic technology and computer science. These concepts are then used for the study and development of advanced control systems for electronic power converters and for electrical drives. In addition to the parts more directly linked to the theory of electrical motor control systems, the fundamental aspects that allow their implementation with new digital technologies are discussed.

TEACHING METHODS

The course includes theoretical lectures (100 hours), exercises on the blackboard (10 hours) and laboratory exercises (10 hours).

SYLLABUS/CONTENT

Fundamentals of stability theory: Premises. Definitions of stability according to Liapunov, motion and trajectory. Stability theorems.

Processing by input-state-output equations: Review of systems theory. Basic definitions. Notes on realizations in normal form. Stability of linear systems. Controllability and observability. Effects of feedbacks.

Control through state estimation (linear case): State estimation. Assignability of the poles and stabilization.

Optimal control: Premises. The maximum principle. Fundamental formulations. Some special cases.

Variable structure control: Operation in "sliding mode", conditions and limits of existence. Assignment of poles via state feedback. Applications to power conditioning systems and DC motor drives.

Cascade control for electric drives: general structure, meaning and effect of the limitations, feedforward action, anti-windup. Exemplification to the case of the DC motor.

Specific control techniques for electronic power converters and alternating current motors: voltage and current control of converters, vector modulation, scalar and vector controls of ac electric motors.

Acquisition and estimation of motor variable quantities and parameters for regulation: sensors, estimation algorithms.

Digital control: general aspects related to the digital implementation of control systems, speed of algorithm execution and choice of sampling periods; digital simulation of control systems.

RECOMMENDED READING/BIBLIOGRAPHY

All the audiovisual material used during the lessons and other educational material will be available on aulaweb. In general, the notes taken during the lessons and the material on aulaweb are sufficient for the preparation of the exam. The texts indicated below, normally available at the Library, are suggested as support for some parts or for further information:

1. F. Saccomanno: “Complementi di Teoria dei Controlli Automatici”, CUSL Genova.
2. Hansruedi Bühler: “Réglage par Mode de glissement”, Presses Poltehniques Romandes, 1986.
3. M. Carpita, M. Marchesoni: "Experimental study of a power conditioning system using sliding mode control", IEEE Transactions on Power Electronics, Vol. 11, No. 5, Settembre, 1996, pp.731-742.
4. N. Mohan, T. M. Undeland, W.P. Robbins – “Power Electronics: Converters, Applications and Design”, John Wiley & Sons Limited, 1995.
5. P.C. Krause, O. Wasynczuk, S.D. Sudhoff, “Analysis of Electric Machinery and Drive Systems”, IEEE Press, 2002
6. B. K. Bose - “Power Electronics and Variable Frequency Drives: Technology and Applications”, IEEE Press, 1996.
7. N. Mohan - “Electric Drives: an Integrative Approach”, MNPERE, Minneapolis, MN 55414 USA, 2001.

TEACHERS AND EXAM BOARD

Exam Board

MARIO MARCHESONI (President)

MARCO INVERNIZZI

STEFANO MASSUCCO

MAURIZIO FRANCO MAZZUCCHELLI

MASSIMILIANO PASSALACQUA

PAOLO POZZOBON

STEFANO SAVIO

LUIS RAMON VACCARO (President Substitute)

LESSONS

LESSONS START

As per the didactic calendar

Class schedule

AUTOMATIC CONTROLS FOR ELECTRICAL DRIVES

EXAMS

EXAM DESCRIPTION

The exam consists of an oral test concerning the entire teaching program; alternatively, it is possible to take a first test concerning the topics covered in the classroom in the first semester and a second test concerning the topics covered in the classroom in the second semester. In the latter case the final mark will be determined by the arithmetic mean of the two marks obtained.

ASSESSMENT METHODS

Details on how to prepare for the exam and on the degree of depth of each topic will be given during the lectures.

Exam schedule