Space Vector Modulation (SVM)
Space Vector Modulation (SVM)
Open loop voltage control
VSI
AC
motor
PWM
v
ref
Closed loop current-control
VSI
AC
motor
PWMi
ref
i
f/back
PWM – Voltage Source Inverter
PWM – Voltage Source Inverter
+ v
c
-
+ v
b
-
+ v
a
-
n
N
V
dc
a
b
c
S1
S2
S3
S4
S5
S6
S1, S2, ….S6
v
a
*
v
b
*
v
c
*
Pulse Width
Modulation
PWM – Voltage Source Inverter
PWM – Voltage Source Inverter
v
tri
V
dc
q
v
c
q
V
dc
Pulse width
modulator
v
c
PWM – single phase
PWM – Voltage Source Inverter
PWM – Voltage Source Inverter
PWM – extended to 3-phase � Sinusoidal PWM
Pulse width
modulator
V
a
*
Pulse width
modulator
V
b
*
Pulse width
modulator
V
c
*
PWM – Voltage Source Inverter
PWM – Voltage Source Inverter