Control of Electrical Drives
Understanding the structure and components of electrical drives. The knowledge about dynamical characteristics of drives with DC, knowledge about agorithms and drive control methods. Brushless DC and induction machines; Modeling, simulation and analysis applied to the basic types of machines and loads.
- apply methods of variables estimation in drives with induction machines
- apply direct torque and flux control to induction machine
- apply vector control structure with voltage and current inverter
- analyze the behavior of electromechanical system with elastic coupling
- apply cascade control structure to electrical drives
- design control algorithm in constant torque and constant power regime for drive with brushless DC
Forms of Teaching
Lectures are organized in two cycles.Exams
Brief tests during lectures.Exercises
Problem solving exercises at classes guided by the assistant.
|Type||Threshold||Percent of Grade||Threshold||Percent of Grade|
|Quizzes||0 %||10 %||0 %||0 %|
|Mid Term Exam: Written||35 %||35 %||0 %|
|Final Exam: Written||35 %||35 %|
|Final Exam: Oral||20 %|
|Exam: Written||40 %||65 %|
|Exam: Oral||35 %|
Week by Week Schedule
- Basic information about course. Structure and components of electrical drive systems. Dynamics of rotational and translational motion. Drive's mechanics, moment inertia, Steiner's statement. Static characteristics of specific loads, static stability of drives operation point. Mechanical interface, modeling.
- Drives based on DC machines. Types of drives concerning the types of the field excitation, dynamical characteristics. Drive's time constants, physical explanation. Control methods, motoring and braking, energy regeneration.
- Converters for DC drives. AC/DC converters (phase converters), transfer function, dead time, torque-speed characteristics, voltage and field control. Phase converters and DC/DC converters (choppers)
- Converters for AC drives. Direct AC/AC converters (cycloconverters) and indirect converters (with DC common bus).
- The model of induction machine adopted to the vector control. Relationships among model´s vectors in coordinate system with rotor flux orientation. Vector modulation. Model of SMPM.
- Induction machine (AC) drive vector control structures in rotor flux coordinate orientation. Control structures of drives with voltage and current inverter. Rotor speed and position estimation. Estimation of rotor flux angle and magnetizing current.
- Direct torque and flux control (DTC). Basic properties of DTC technique. Vector control vs. direct torque control. Position of specific vectors in stator flux and rotor flux coordinate system. Torque and flux controllers.
- Mid-term exam
- Cascade control structures. Magnitude optimum. Symmetrical optimum.
- Application of cascade structures in control of electrical drives.
- Damping optimum and its application to control of electrical drives.
- Modulus optimum and its application to control of electrical drives.
- Classical structures of control of electromechanical systems with elastic coupling.
- Application of polynomial controller (RST) in control of electrical drives.
- Final exam