Direct Torque Control with Space Vector Modulation for Induction Motors Fed by Cascaded Multilevel Inverters

Direct torque control (DTC) has achieved utilization on two-level inverters and three-level diode-clamped inverters, and it has high performance of speed control. But DTC hasn't been utilized to cascaded multilevel inverters at present. In this paper, a novel space vector modulation (SVM) approach for cascaded multilevel inverters is presented firstly. Then by combining it with the DTC approach based on SVM, the approach of using DTC to cascaded multilevel inverters is presented. And it is verified by using a three-cell cascaded frequency control laboratory system. The proposed approach solves the issues that switching state table is difficult to generate and switching frequency is not fixed, which is arisen from using conventional DTC to cascaded multilevel inverters. It will be of benefit to the utilization of DTC on the speed control of induction motors fed by cascaded multilevel inverters

[1]  J. K. Steinke,et al.  A reliable, interface-friendly medium voltage drive based on the robust IGCT and DTC technologies , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[2]  Kyo-Beum Lee,et al.  Torque ripple reduction in DTC of induction motor driven by 3-level inverter with low switching frequency , 2000, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018).

[3]  F. Blaabjerg,et al.  A modified direct torque control (DTC) for induction motor sensorless drive , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[4]  Bin Wu,et al.  A general space vector PWM control algorithm for multilevel inverters , 2003, Eighteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2003. APEC '03..

[5]  L.M. Tolbert,et al.  Direct torque control of induction machines using space vector modulation , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[6]  Y. Lai,et al.  Topology for hybrid multilevel inverter , 2002 .

[7]  R. Portillo,et al.  New fast space-vector modulation for multilevel converters based on geometrical considerations , 2002, IEEE 2002 28th Annual Conference of the Industrial Electronics Society. IECON 02.

[8]  V. Perelmuter.  Three-level inverters with direct torque control , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).