The Issues of Today’s Science and Production (Power Engineering)

Published: Friday, 28 October 2016 08:30

Programme Summary

Major: 13.04.02 Power Industry and Electrical Engineering

Degree: Master

Course units:

1. Introduction. Contents and structure of the course. Today’s basis of power electronics.
2. Design of today’s electric drive ‘Frequency Converter - Induction Motor’.
3. Pulse-width modulation: Overview.
4. Active front-end converter:  Distinctive features, design, control algorithms.
5. Modern design solutions for multi-motor drives with a common DC link.
6. Three-tier frequency converter – main circuit, output voltage generation principle, means to control power key.
7. Powerful variable frequency drives with 12- and 18-pulse rectifiers.

Course contents:

1. Introduction. Contents and structure of the course. IGBTs and IGCTs as modern-day basis for power electronics: Design and key features.
2. Design of today’s electric drive ‘Frequency Converter/Induction Motor’. Capacitor pre-charge unit in a DC link. Design features of DC bus as part of a frequency converter.  Overvoltage during transistor switching and main types of snubber circuits. Cooling of frequency converter power keys.
3. Pulse-width modulation (PWM): Overview. Classic PWM. Modified PWM algorithms: PWM with third harmonic injection, with reduced switch count.
4. Active front-end converter:  Distinctive features, design, control algorithms. Design and function of LCL filter in an active front-end converter. Active front end control diagram. Synchronizing active front-end converter with the mains supply.
5. Modern design solutions for multi-motor drives with a common DC link. Performance and electromagnetic compatibility of such drives.
6. Three-tier frequency converter – main circuit, output voltage generation principle, means to control power key. Comparative analysis of two- and three-tier frequency converters.
7. Powerful variable frequency drives with 12- and 18-pulse rectifiers. Connecting network transformers to build polyphase circuits. Harmonic composition of voltage and current consumed by powerful electric drives.

Activities:

1. Teacher-led group activities in a classroom;
2. Extracurricular self-study of the teacher’s assignments and tasks, including the use of educational facilities (obligatory);
3. Office-hours.

Total hours – 72

Total points – 2

Laboratory classes – 15

Midterm assessment – Pass/fail examination