Title: SOLID STATE D.C. DRIVES
Coordinator: Okyay Kaynak, Professor of Electrical Engineering
Goals: This course covers solid-state control of dc drives, using different types of power converters. 2-quadrant, 4-quadrant and dual converter systems are covered. Closed loop cascade control system is introduced and how current and speed control loops are tuned are explained. An introduction to ac drives is also given.
At the end of this course, students will be able to:
Compare the advantages and disadvantages of ac and dc speed control systems
Describe and compare speed control systems based on different power converters
Explain how dc drive systems are tuned
Describe how the speed of ac motors are controlled.
Demonstrate an awareness of current issues in industrial speed control equipment
O. Kaynak, Güç Elektroniği: Elemanlar, Devreler ve Sistemler, Boğaziçi Universitesi, 1988
R. Krishnan, Electric Motor Drives, Modeling, Analysis and Control, Prentice-Hall, 2001
Prerequisites by Topic:
Basic knowledge of power converter circuits
Electromechanical energy conversion
1. Review of Basic Power Electronic Circuits (2 weeks)
2. Principles of Control of Drive Systems (1 week)
3. Modeling of DC Drive Systems (2 weeks)
4. Tuning of DC drive systems (2 weeks)
5. Chopper-Fed Drives (1 week)
6. Bridge Converter Fed Drives (1 week)
7. Four-Quadrant Operation (1 week)
8. Braking of DC Drives (1 week)
9. Introduction to AC Drive Systems (1 week)
10. Comparison of AC and DC Drive Systems (1 week)
Course Structure: The class meets for two lectures a week, one consisting of two 50-minute sessions, the other one 50-minute session. The small size of class enables to closely evaluate the progress of the students. A mid-term and a final exam are given.
Computer Resources: None
Laboratory Resources: The facilities of the mechatronics laboratory are used for demonstrations.
1. In class participation (15%)
2. Mid-term exam (35% each).
3. A final exam (50%).
(a) Apply math, science and engineering knowledge. The students learns to use different tools from control theory in the analysis of speed control systems.
(b) Design a system or a component to meet desired needs. The discussions held in class focus on how to choose the best drive system, given a particular application. Students become able to relate the performance characteristics of electrical machines to their design parameters.
(c) Recognize the need for, and an ability to engage in life-long learning. Throughout the course, how fast the technology is changing is stressed, necessitating continual learning. In the face abundance of knowledge, the paradigm shift from “just-in-case teaching” to “just-in-time learning” is explained.
(d) A knowledge of contemporary issues. During the lectures, attention is focused on current variable speed drive issues such as high performance, high efficiency, EMC and harmonics introduced by power converters. Regenerative breaking is discussed as a means of regaining energy.
(e) Use of modern engineering tools. Students use MATLAB and SIMULINK to analyze the performance of closed loop cascade speed control systems.
Prepared By: Okyay Kaynak