Kyo-Beum Lee, Joo-Ho Song, Ick Choy, Ji Yoon Yoo, Myungkil Jung, Ki-Joon Han, and Jae-Hak Yoon, “Torque ripple reduction in DTC of induction motor driven by 3-level inverter with low switching frequency,” 전력전자학술대회 논문집, pp. 203–206, 2000. > Paper

This paper presents a torque ripple reduction technique of direct torque control(DTC) for high power induction motors driven by

3-level Inverters with the inverter switching frequency limited around 0.5-1kHz level. It is noted that conventional DTC algorithms to

reduce torque ripple are devised for applications with relatively high switching frequency above 2-3kHz. A new DTC algorithm, 

especially for low switching frequency inverter system, illustrates relatively reduced torque ripple characteristics. Simulation and experimental results show the effectiveness of the proposed control algorithm.