Environmental Engineering Reference
In-Depth Information
Q
1
Q
3
Q
5
V
DC
2
L
a
v
a
a
L
b
N
v
b
b
L
c
v
c
c
V
DC
2
C
a
C
b
C
c
Q
4
Q
6
Q
2
'
N
(a) Topology
v
a
v
aN
V
DC
/2
−V
DC
/2
v
bN
v
b
V
DC
/2
−V
DC
/2
v
cN
v
c
V
DC
/2
−V
DC
/2
0
π/2
π
3π/2
2π
ωt/rad
(b)
v
aN
,
v
bN
,
v
cN
and the three-phase voltages
v
a
,
v
b
and
v
c
v
NN
,
v
NN
,
a
V
DC
/2
−V
DC
/2
0
π
/2
π
3
π
/2
2
π
ωt/rad
(c)
v
NN
and its average
v
NN a
over a switching period
Figure 1.22
Operation of a three-phase inverter
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