Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...
Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...
Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...
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<strong>Direct</strong> <strong>Torque</strong> <strong>Control</strong> <strong>with</strong> <strong>Space</strong> <strong>Vector</strong> <strong>Modulation</strong><br />
M<br />
e_ ref( z)<br />
P ( ) M<br />
z<br />
C ( ) M<br />
z<br />
U sy<br />
Dz ( )<br />
z −1<br />
G ( ) M<br />
z<br />
}<br />
AM<br />
s<br />
ZOH<br />
2<br />
s + B s+<br />
C<br />
M<br />
M<br />
M ( ) e<br />
z<br />
Figure 5.40. Block diagram <strong>of</strong> torque control loop <strong>with</strong> prefilter in discrete domain.<br />
Finally, the reference tracking performance <strong>of</strong> closed torque control loop <strong>with</strong> prefilter is<br />
presented in Fig. 5.41.<br />
Figure 5.41. a) Reference tracking performance <strong>of</strong> the torque control loop for sampling time<br />
Ts<br />
= 200µ<br />
s, b) <strong>with</strong> denoted rise time, overshoot and settling time.<br />
In digital control when the sampling time is changing the parameters <strong>of</strong> digitalized plant<br />
control AMd, BMd,<br />
C<br />
Md<br />
will be also changes. It is normally that the parameters <strong>of</strong> PI torque<br />
control will be changes also (see Table 5.4.).<br />
Simulation for PI flux calculated parameters <strong>with</strong> and <strong>with</strong>out prefilter are shown in Fig.<br />
5.42a-b. Also torque step response for different level <strong>of</strong> reference torque are presented in Fig.<br />
5.43.<br />
105