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