Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...

Direct Torque Control with Space Vector Modulation
M
e_ ref( z)
P ( ) M
z
C ( ) M
z
U sy
Dz ( )
z −1
G ( ) M
z
}
AM
s
ZOH
2
s + B s+
C
M
M
M ( ) e
z
Figure 5.40. Block diagram of torque control loop with prefilter in discrete domain.
Finally, the reference tracking performance of closed torque control loop with prefilter is
presented in Fig. 5.41.
Figure 5.41. a) Reference tracking performance of the torque control loop for sampling time
Ts
= 200µ
s, b) with denoted rise time, overshoot and settling time.
In digital control when the sampling time is changing the parameters of digitalized plant
control AMd, BMd,
C
Md
will be also changes. It is normally that the parameters of PI torque
control will be changes also (see Table 5.4.).
Simulation for PI flux calculated parameters with and without prefilter are shown in Fig.
5.42a-b. Also torque step response for different level of reference torque are presented in Fig.
5.43.
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