Direct torque control with imposed switching frequency in an 11-level cascaded inverter
Rodriguez, J.; Pontt, J.; Kouro, S.; Correa, P.
Industrial Electronics, IEEE Transactions on
Volume 51, Issue 4, Aug. 2004 Page(s): 827 - 833
Digital Object Identifier   10.1109/TIE.2004.831733
Summary: This paper presents the application of direct torque control in an induction motor, using a multilevel cascaded inverter with separated DC sources. The control strategy operates with imposed switching frequency, improving torque behavior. The paper studies the theoretical concepts related to this method, like vector selection, state variables estimation, and commutation time calculation. In addition, this paper presents results for a three- and eleven-level inverter-fed drives, from which it can be appreciated that the increase of levels of the load voltage reduces the torque ripple.

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