A torque ripple reduction technique of direct torque control(DTC) for high power induction motor driven by 3-level inverters with
the inverter switching frequency limited around 0.5-1.0kHz level is presented. It is noted that conventional DTC algorithms to
reduce torque ripple are devised for applications with relatively high switching frequency above 2-3kHz. Such conventional
algorithms can not accomplish satisfactory torque ripple reduction for 3-level inverter systems with lower switching frequency. A
new DTC algorithm, especially for low switching frequency inverter system, illustrates relatively reduced torque ripple characteristics
all over the operation speed region. Simulation and experimental results show the effectiveness of the proposed control algorithm.
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