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Direct torque control of induction machines using space vector modulation

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4 Author(s)
Habetler, T.G. ; Sch. of Electr. Eng., Georgia Inst. of Technol., Atlanta, GA, USA ; Profumo, F. ; Pastorelli, M. ; Tolbert, L.M.

A direct induction machine torque control method based on predictive, deadbeat control of the torque and flux is presented. By estimating the synchronous speed and the voltage behind the transient reactance, the change in torque and flux over the switching period is calculated. The stator voltage required to cause the torque and flux to be equal to their respective reference values is calculated. Space vector PWM is used to define the inverter switching state. An alternative approach to deadbeat control for use in the transient or pulse-dropping mode is also presented. An alternative modulation scheme is presented in which transient performance is improved by specifying the inverter switching states and then calculating the required switched instants to maintain deadbeat control of the flux while reducing the torque error during the entire switching interval. A similar approach is used for a transient in the flux. The implementation of the control scheme using DSP-based hardware is described, with complete experimental results given

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Industry Applications, IEEE Transactions on  (Volume:28 ,  Issue: 5 )