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 />
5.4 Speed control loop for <strong>DTC</strong>-<strong>SVM</strong> structure<br />
The structure <strong>of</strong> speed control loop for cascade (a) and parallel (b) <strong>DTC</strong>-<strong>SVM</strong> scheme<br />
is shown in the Fig. 5.46.<br />
a)<br />
U DC<br />
Ψ s _ ref<br />
U<br />
s α _ ref<br />
S A<br />
S B<br />
Ω m _ ref<br />
M e _ ref<br />
e M<br />
∆δ Ψ<br />
U<br />
s β _ ref<br />
S C<br />
θ Ψs Ψs<br />
I s<br />
M e<br />
I s<br />
d<br />
dt<br />
γ m<br />
U DC<br />
b)<br />
Ψ s _ ref<br />
e Ψ<br />
ss<br />
U sx _ ref<br />
s<br />
_ ref<br />
S A<br />
S B<br />
Ω m _ ref<br />
M e _ ref<br />
e M<br />
U sy _ ref<br />
U α<br />
U<br />
s β _ ref<br />
S C<br />
θ Ψs<br />
Ψ<br />
I s<br />
M e<br />
d<br />
dt<br />
Figure 5.46. Speed control loop for: a) cascade structure <strong>of</strong> <strong>DTC</strong>-<strong>SVM</strong> scheme, b) parallel<br />
structure <strong>of</strong> <strong>DTC</strong>-<strong>SVM</strong> scheme.<br />
γ<br />
m<br />
The mechanical speed equation (2.66) for the PMSM is:<br />
dΩ<br />
M M J dt<br />
m<br />
e<br />
−<br />
L<br />
= (5.81)<br />
Taking Laplace transformation to equation (5.81) one obtains:<br />
M () s − M () s = JsΩ () s<br />
(5.82)<br />
e L m<br />
The transfer function between mechanical rotor speed<br />
M<br />
e<br />
can be expressed as:<br />
Ω<br />
m<br />
and electromagnetic torque<br />
110