Direct Power and Torque Control of AC/DC/AC Converter-Fed ...

Appendices
3 ⎧2
2 2
2
Im{} S = Q = Im⎨
( U + + ) ( + + ) ⎬ ⎫
A
aU
B
a U
C
I
A
a I
B
aIC
(A.3. 15)
2 ⎩3
3
⎭
Q
1
=
3
[ I ( U −U
) + I ( U −U
) + I ( U −U
)]
A
B
C
B
C
A
C
A
B
(A.3.15a)
1
Q =
A BC B CA
+
3
( I U + I U I U )
C
AB
(A.3.15b)
A.4. Simulation Model and Laboratory setup
A.4.1. Saber Model
The control schemes of AC/DC/AC converter-fed induction motor drive were
implemented in Saber Synopsys Inc. v. 2.4. Saber gives possibilities to analysis
behavior of analog and digital control structures as well as electrical circuits.
Constructed model is presented in Fig. A. 4. 1 .The main data of the model are
shown in Tab. A. 4. 1-Tab. A. 4. 3.
Tab. A. 4. 1. Data of the Induction Motor in Saber Model
Nominal power P
N
= 3 kW
Nominal voltage U
SN
= 380 V
Nominal current I
SN
= 6.9 A
Nominal frequency f
SN
= 50 Hz
Base speed
Ω
mN
= 1415 rpm
Number of pole pairs p
b
= 2
Moment of inertia J = 0.0154 kgm 2
Nominal stator flux Ψ
SN
= 0.98 Wb
Nominal torque M
N
= 20 Nm
Stator resistance R
S
= 1.84 Ω
Rotor resistance R
r
= 1.84 Ω
Stator inductance L
S
= 0.17 H
Rotor inductance L
r
= 0.17 H
Main inductance L
M
= 0.16 H
Phase number m = 3
S
Tab. A. 4. 2.Data of the Supply Line and AC/DC/AC Converter Model
Line voltage U
L
= 141 V
Line frequency f
L
= 50 Hz
DC-link voltage U
DC
=560 V
Resistive load R
load
= 100 or 150 Ω
DC-link capacitor C =470 µFor 47 µF
148