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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Modeling and control modes <strong>of</strong> PM synchronous motor drives<br />
The active power requirement as a function <strong>of</strong> torque is illustrated in Fig. 2.17 for the<br />
different control strategies. It can be seen, that all control strategies require<br />
approximately the same value <strong>of</strong> active power for a given torque. CSF control needs<br />
less active power in the region up to 1.3 pu torque.<br />
The reactive power requirement as a function <strong>of</strong> torque is illustrated in Fig. 2.18. It can<br />
be seen, that CTA control requires the highest value <strong>of</strong> active power for a given torque<br />
and the CSF control lowest.<br />
4<br />
QN<br />
[ pu]<br />
3<br />
2<br />
CTA<br />
MTPA<br />
1<br />
UPF<br />
CSF<br />
0<br />
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2<br />
M [ ] eN<br />
pu<br />
Figure 2.18. Reactive power versus electromagnetic torque under different control strategies.<br />
1.1<br />
1<br />
0.9<br />
UPF<br />
CSF<br />
cosφ<br />
0.8<br />
MTPA<br />
0.7<br />
0.6<br />
CTA<br />
0.5<br />
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2<br />
M [ ] eN<br />
pu<br />
Figure 2.19. Power factor as a function <strong>of</strong> electromagnetic torque under different control<br />
strategies.<br />
The power factor as a function <strong>of</strong> torque is illustrated in Fig. 2.19. It can be seen, that as<br />
it could be expected, UPF control requires constant power factor for a given torque.<br />
CSF control is very close to the unity power factor up to 1 pu torque.<br />
The above analysis can be summarized as shown in Table. 2.2.<br />
31