Theory of Electronic Power Converters

Lecturer:

Tutor:

Supervisor:

Department of Electric Drives and Traction

Synopsis:

DC magnetization of transformer, rectifier commutation analysis, continuous and discontinuos current, control of two-level and multilevel voltage inverters, compatible rectifier, soft commutation, matrix converters, current inverters, AC-AC controller theory, power theories, power active filters, semiconductor element protection, snubbers.

Requirements:

Active participation on lab measurements (max.3 excused absencess), elaboration of check test, presentment of own lab works

Syllabus of lectures:

Literature for study will be recommended before every lecture

1. Current and voltage stresses of elements, catalloque data

2. Origin of DC magnetization of transformer, its types and measures for its supression

3. Analysis of rectifier modes, commutation voltage drop and its determination

4. Multiple commutation, V-A characteristics

5. Analysis of behaviour of restifier with voltage load, continuous and discontinuous current, boundary of the modes

6. Voltage inverters: Diffrent control methods, harmonic analysis of voltages and currents

7. Voltage inverters: Space vector modulation strategy, control, multilevel inverters

8. Voltage inverters as compatible rectifier, voltage inverters with soft commutation

9. Matrix converters, cycloconverters

10. Current inverters: Principle of Shukalov circuitry operation

11. AC-AC controllers: Working diagram of three phase controller for different loads

12. Modern power theoris: Use of AC-AC controllers for power factor compensation and grid symmetrisation

13. Active power filters: types and principle of operation

14. Protection of elements against overvoltages and overcurrents, snubbers

Syllabus of tutorials:

Two exercises may be united in one four-hour exercise

1. Choice of elements for given parameters, catalloque data

2. Measurement of different types of DC magnetization

3. Measurement of commutation angle for different types of rectifiers, different input and output impedance

4. Measurement of V-A characteristics of rectifier and analysis of multiple commmutation

5. Controlled recrifier with a voltage on DC side, boundary between continuos and discontinuos mode

6. Measurement on three phase inverter: voltage and current harmonic analysis

7. Measurement on three phase inverters: observation of voltage and current space vectors

8. Measurement on compatible rectifier

9. Measurement on cycloconverter

10. Measurement on current inverter

11. Three phase AC-AC controller, comparison of voltage and current waveshapes with theoretical ones

12. Measurement on circuitry for grid symmetrization and for power factor compenzation by controlled inductor

13. Measurement on active power filter

14. Demonstration of influence of snubbers. Credit

Study Objective:

Study materials:

Bose,B.K.:Modern Power Electronics, IEEE, N.Y., 1992

Note:

Further information:

No time-table has been prepared for this course

The course is a part of the following study plans:

• Heavy-current Engineering - Electric Drives- structured studies (compulsory course)