This document discusses different types of frequency converters. It describes a three-phase two-tier frequency converter that uses bidirectionally connected power switches and programmed pulse-width modulation. It also describes a matrix frequency converter that uses a cascade voltage summation principle with IGBT modules connected in a matrix formation and compensating capacitances. The document presents the switching algorithm, commutating angle equation, output signal diagrams, and a 2-stage frequency converter diagram in Matlab Simulink.

1. St. Petersburg Electrotechnical University 27.01.2011 Elvira I. Baygildina 1 Project: ”Matrix frequency converter based on full-controlled IGBT-modules with output voltage PWM“

3. Programmed high-frequency pulse-width modulation;

5. IGBT-modules are connected as a matrix;

6. Compensating capacitances for current continues flowing.

7. 27.01.2011 4 Elvira I. Baygildina Matrix frequency converterwith output voltage PWM

8. 27.01.2011 5 Elvira I. Baygildina Direct frequency converter’s one stage

9. 27.01.2011 6 Elvira I. Baygildina Transistor switching’s algorithm On-state period 120о + γ Control angle α = 0 Resolution function Ji , i = 1…6

10. 27.01.2011 Elvira I. Baygildina 7 Commutating angle γ Xγ is the inductive reactance of the transformer phase; Id is the load current instantaneous value; E2tr is the phase electromotive force (root mean square value) of the transformer secondary winding.

11. 27.01.2011 8 Elvira I. Baygildina Transistor switching’s algorithm

12. Output signaldiagrams 27.01.2011 9 Elvira I. Baygildina

13. 27.01.2011 10 Elvira I. Baygildina 2-stage frequency converterdiagram in Matlab Simulink

14. 27.01.2011 11 Elvira I. Baygildina Output voltage time diagramfrom 2-stage FC

15. Thanks for your attention! elvira-bai@mail.ru