16.1 POWER SEMICONDUCTOR-CONTROLLED DRIVES 771

(b)

(^0) π 2 π 3 π ωt
iC 1
(^0) ωt
iC 2
(^0) ωt
iC 3
(^0) ωt
iC 4
(^0) ωt
iC 5
(^0) ωt
iC 6
0
π
2 π ωt
3 π
vAB
Vd
0 π 2 π ωt
I
1
3
II III IV V VI I II III IV V Intervals
3 π
vAN
iA iA
Vd^23 Vd
vAN
Figure 16.1.19Continued
V 1 =
√
2
π
Vd (16.1.48)
From Figure 16.1.18(b), the rms value of the phase voltage is given by
V=
[
1
π
{∫
π 3
0
(
1
3
Vd
) 2
d(ωt)+
∫ 2 π/ 3
π/ 3
(
2
3
Vd
) 2
d(ωt)

• 
  

  ∫π
  2 π/ 3
  (
  1
  3
  Vd
  ) 2
  d(ωt)
  }] 1 / 2

  
  

  √
  2
  3
  Vd (16.1.49)