ECE 661 - DC and Flexible AC Transmission


Professor Ramadan El-Shatshat


Tuesdays 11:30am-2:20pm in EIT 3151


  1. Mohan, Undeland and Robbins, Power Electronics: Converters, Applications and Design, 2nd or 3rd Edition, John Wiley & Sons, Inc., 1995 or 2003.
  2. Kimbark E. W., Direct Current Transmission, Vol. I, John Wiley,1971.
  3. N.G. Hingorani and L. Gyugyi, Understanding FACTS: Concept and Technology of Flexible AC Transmission Systems, IEEE Press, 2000.
  4. Lecturer notes and journal papers


The objective of this course is to provide advanced knowledge and understanding of power electronics applications in power transmission systems. The focus will be on two important application areas – high voltage direct current (HVDC) transmission systems and flexible AC transmission systems (FACTS). This course provides an in-depth look at: Power semiconductor devices, power converters, characteristics of HVDC systems, specific FACTS controllers. This course will concentrate on the operating principles, models and design of power electronic systems used in these applications.


Open to electrical engineering graduate students. Basic understanding of power electronics and power systems analysis and familiarity with at least one of the simulation tools –EMTDC/EMTP, Simulink or PSpice are assumed.


Each student will be required to choose a specific power electronic application to power transmission system and submit a project report before the end of the term. The length of the project report should not exceed 15 pages single sided.

Major Topics

  • DC Transmission System

    Comparison with AC transmission, application, planning considerations, thyristor valves, analysis of bridge converters, control of converters, Reactive power supply, harmonic filters, multi-terminal DC transmission, AC-DC System Interactions, Light HVDC

  • Flexible AC Transmission Systems (FACTS)

    Concepts of power flow control and power system stability, thyristor-based and PWM converter based FACTS devices - TCSC, SVC, STATCOM, static phase shifters and UPFC, modeling FACTS devices


Assignments 20%
Project 30%
Final 50%