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Output Voltage of 3L-NPC VSC<br />

V aM =-V dc /2<br />

v aM<br />

V dc<br />

V dc /2<br />

M<br />

D 1<br />

S 1<br />

S 2<br />

a<br />

V dc /2<br />

-V dc /2<br />

V dc /2<br />

D 2<br />

S 3<br />

S 1<br />

S 2<br />

S 3<br />

S 4<br />

V DC<br />

/2<br />

on<br />

on<br />

off<br />

off<br />

S 4<br />

0<br />

off<br />

on<br />

on<br />

off<br />

-V DC<br />

/2<br />

off<br />

off<br />

on<br />

on<br />

Power Electronics Lab<br />

All rights reserved.Prof. Bernet 9/2003-10

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