ECE 5274 Modeling and Control of Three-Phase PWM Converters | ECE | Virginia Tech


Course Information


Power conversion principles for three-phase pulse-width modulation techniques, control and converters. Development of averaged models of three-phase rectifiers and inverters in stationary and rotating coordinates. Small-signal models in rotating coordinates and control design. Introduction of switching state vectors and different modulation schemes. Three-phase inverter and rectifier applications. Parallel and multi-level three-phase converters.

Why take this course?

Three-phase converters cover most medium and high power applications in the power electronics area. There has been no such course in this university; the course 5254, Power Converter Modeling and Control, covers only the material related to the dc-dc converters. However, over 30 graduate students are doing research in the area of three-phase power conversion.


Prerequisites: ECE 4224 or equivalent

This course requires 4224 as a prerequisite. 4224 covers the average and small-signal modeling of generic switching cells, and basic principles of closed-loop control design and PWM techniques for dc-dc converters.

Major Measurable Learning Objectives

  • Explain operation principles of three-phase PWM converters;
  • Use different modulation techniques to generate PWM for three-phase converters;
  • Design closed-loop control for three-phase PWM converters, and;
  • Select and design converters for medium and high power applications.

Course Topics


Percentage of Course

Introduction of three-phase variables, I, u, & p 5%
Basic topologies of three-phase converters 5%
Averaged models in stationary coordinates 10%
ABC/DQ0 transformation and averaged models in rotating coordinates 10%
Small-signal modeling and control design 15%
Modulation techniques 15%
Average model of modulators 10%
Reduced-order modeling for three-phase converters 5%
Multi-phase converters 10%
Parallel three-phase converters 5%
Multi-level converters 10%