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Three Level NPC Voltage Source Converter (3L-NPC VSC)<br />
V dc<br />
S 1a<br />
S 1b<br />
S 1c<br />
D 1a D 1b<br />
D 1c<br />
S 2a<br />
a<br />
S 2b<br />
b<br />
S 2c<br />
c<br />
reference-, carrier signal<br />
1<br />
0.5<br />
0<br />
D 2a<br />
S 3a D 2b S 3b D 2c<br />
S 3c<br />
-0.5<br />
S 4a<br />
S 4b<br />
S 4c<br />
-1<br />
0 0.005 0.01 0.015 0.02<br />
IGBTs / Diodes : 12 / 12 + 6<br />
Commutation cells per phase leg : 2<br />
Rated commutation voltage: V com =V dc / 2<br />
(e.g. V ll =2.3kV, V dc,n =3400V, V com = V dc,n / 2<br />
= 1700V → 3300V IGBTs / IGCTs)<br />
t [s]<br />
Modulation scheme of 3L-NPC VSC<br />
(f c = 875 Hz, f o = 50 Hz, m = 1.114)<br />
Power Electronics Lab<br />
All rights reserved.Prof. Bernet 9/2003-7
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