Analysis and prediction of inverter switching frequency in directtorque control of induction machine based on hysteresis bands andmachine parameters
Kang, J.-W.; Sul, S.-K.
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 3, Jun 2001 Page(s):545 - 553
Digital Object Identifier 10.1109/41.925581
Summary:In this paper, the influences of the hysteresis bands on the
direct torque control (DTC) of an induction motor are analytically
investigated, and the switching frequency of the inverter is predicted
based on the analysis. The flux and torque hysteresis bands are the only
gains to be adjusted in DTC, and the inverter switching frequency and
the current waveform are greatly influenced by them. Therefore, the
magnitude of the hysteresis band should be determined based on
reasonable guidelines which can avoid excessive inverter switching
frequency and current harmonics in the whole operating region. This
paper predicts the inverter switching frequency according to torque and
flux hysteresis bands based on induction machine parameters and control
sampling period, and investigates the effect of hysteresis bands to line
current harmonics. The simulated and experimental results prove the
usefulness and feasibility of the proposed method
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