Improved direct torque control of induction motor with dither injection |
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Authors: | R K Behera S P Das |
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Affiliation: | (1) Department of Electrical Engineering, Indian Institute of Technology, Kanpur, 208 016, India |
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Abstract: | In this paper, a three-level inverter-fed induction motor drive operating under Direct Torque Control (DTC) is presented.
A triangular wave is used as dither signal of minute amplitude (for torque hysteresis band and flux hysteresis band respectively)
in the error block. This method minimizes flux and torque ripple in a three-level inverter fed induction motor drive while
the dynamic performance is not affected. The optimal value of dither frequency and magnitude is found out under free running
condition. The proposed technique reduces torque ripple by 60% (peak to peak) compared to the case without dither injection,
results in low acoustic noise and increases the switching frequency of the inverter. A laboratory prototype of the drive system
has been developed and the simulation and experimental results are reported. |
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Keywords: | Direct torque control dither injection induction motor drives three-level converter |
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