SLIDES in 'pdf' format
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Multi-Level VSC (e.g. 4L-FC VSC)<br />
S 1<br />
S 2 S 3<br />
1<br />
V<br />
V<br />
3 dc<br />
3 dc<br />
S 6<br />
2<br />
a<br />
V dc<br />
M C 1 C 2<br />
IGBTs / Diodes : 18 / 18<br />
Fly<strong>in</strong>g Caps: 6<br />
S 5<br />
S 4<br />
Commutation cells per phase leg : 3<br />
Rated commutation voltage: V com =V dc / 3<br />
(e.g. V ll =2300 V, V dc,n =3400V, V com = V dc,n /<br />
3 = 1133V → 2500V IGBTs )<br />
reference-, carrier signal<br />
1<br />
0.5<br />
0<br />
-0.5<br />
-1<br />
0 0.005 0.01 0.015 0.02<br />
t [s]<br />
Modulation scheme of 4L-FLC VSC<br />
(f c = 875 Hz, f o = 50 Hz, m = 1.114)<br />
FC VSC<br />
• V C =V DC / (L-1)<br />
• f 1cb =(L-1)f c<br />
Power Electronics Lab<br />
All rights reserved.Prof. Bernet 9/2003-17