Direct Power and Torque Control of AC/DC/AC Converter-Fed ...

3. Vector Control Methods of AC/DC/AC Converter-Fed IM Drives – A Review
3.4. Conclusion
Based on discussion presented in this Chapter a brief comparison of control
techniques for AC/DC/AC converter-fed IM dives is given in Tab. 3. 4.
Among discussed control methods DTC-SVM and DPC-SVM seems to be most
attractive for further consideration. Because these methods connect well known
advantages of FOC and V-FOC with attractiveness of novel strategies such as
hysteresis based DTC and DPC. Therefore, for further considerations a shorter name
will be used for common control method of full controlled AC/DC/AC converter:
Direct power and torque control with space vector modulation – DPTC-SVM.
Tab. 3. 4. Comparison of control techniques for AC/DC/AC converter – fed IM drives
Feature IFOC/V-FOC DTC/VF-DPC DPC-SVM/DTC-SVM
Constant switching freq. Yes (5 kHz) No Yes (5 kHz)
SVM blocks Yes No Yes
Coordinates transform. Yes No Yes (only one)
Direct control of
(VSI side)
Estimation of
(VSI side)
Coordinates orientation
(VSI side)
Direct control of
(VSR side)
Estimation of
(VSR side)
Coordinates orientation
(VSR side)
Stator currents Torque, Stator Flux Torque, Stator Flux
Rotor flux angle Torque, Stator Flux Torque, Stator Flux
Rotor flux Stator flux Stator flux
Line currents Line powers Line powers
Virtual flux Powers, Virtual flux Powers, Virtual flux
Virtual flux Virtual flux Virtual flux
Line voltage sensorless Yes Yes Yes
Sampling frequency 5 kHz 50kHz 5kHz
Independence from
rotor parameters;
universal for IM and
permanent magnet
synchronous motor –
PMSM
No Yes Yes
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