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

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