elvira i. baygildina, "matrix frequency converter based on full-controlled igbt-modules with...

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“

27.01.2011 Elvira I. Baygildina 2

Three-phase two-tier frequency converter

• Bidirectional connected power switches;• Programmed high-frequency pulse-width modulation;• Capacitances for reactive currents compensating.

27.01.2011 Elvira I. Baygildina 3

Matrix frequency converter

• Cascade principle of voltage summation;

• IGBT-modules are connected as a matrix;

• Compensating capacitances for current

continues flowing.

27.01.2011 Elvira I. Baygildina 4

Matrix frequency converter

with output voltage PWM

27.01.2011 Elvira I. Baygildina 5

Direct frequency converter’s one stage

27.01.2011 Elvira I. Baygildina 6

Transistor switching’s algorithm

1.Jthen,γ6

πτ

6

9πorγ

6

7πτ

6

3πIf

1,Jthenγ,6

3πτ

6

11πorγ

6

9πτ

6

5πIf

1,Jthenγ,6

11πτ

6

7πorγ

6

5πτ

6

πIf

3

2

1

On-state period 120о + γControl angle α = 0 Resolution function Ji , i = 1…6

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.

27.01.2011 Elvira I. Baygildina 8

Transistor switching’s algorithm

.1Kelse,1Kthen,uu,0j,0uIf

,1Kelse,1Kthen,uu,0j,0uIf

,1Kelse,1Kthen,uu,0j,0uIf

,1Kelse,1Kthen,uu,0j,0uIf

,1Kelse,1Kthen,uu,0j,0uIf

,1Kelse,1Kthen,uu,0j,0uIf

,0KKKKKK

36опy3tc

25опy2tb

14опy1ta

63опy3tc

52опy2tb

41опy1ta

654321

27.01.2011 Elvira I. Baygildina 9

Output signal diagrams

27.01.2011 Elvira I. Baygildina 10

2-stage frequency converterdiagram in Matlab Simulink

27.01.2011 Elvira I. Baygildina 11

Output voltage time diagram from 2-stage FC

Thanks for your attention!

elvira-bai@mail.ru