Development of combined vector and Direct Torque Control methods for independent two induction motor drives

Many applications use two or more motors operating in parallel configuration by using one variable speed drive. This system is able to control these multiple motors at the same desired motor speed operation which provide advantages in terms of components and cost reduction. However, the system is not able to control each motor separately if it is desired to operate at different speeds and it also cannot withstand the load disturbance. To address this problem, the design of combined Vector Control-Direct Torque Control (DTC) methods is proposed and their performance is investigated for the case of independent controlled two induction motors fed by single Five Leg Inverter (FLI) method. Double Zero Sequence (DZS) Injection Method Space Vector Pulse Width Modulation (SVPWM) scheme is used for the FLI. Simulation results from the Simulink/Matlab that verify the validity of the method are also included. The results show the ability of the proposed method to control motor speed independently under forward-reverse step speed command and load disturbance condition.

[1]  Kouki Matsuse,et al.  Characteristics of independent vector control of two induction motors fed by a five-leg inverter with space vector modulation , 2011, Proceedings of The 7th International Power Electronics and Motion Control Conference.

[2]  K. Matsuse,et al.  A characteristic analysis of four-leg inverter in two AC motor drives with independent vector control , 2007, 2007 International Conference on Electrical Machines and Systems (ICEMS).

[3]  Kouki Matsuse,et al.  A Nine-Switch Inverter for Driving Two AC Motors Independently , 2007 .

[4]  Kouki Matsuse,et al.  Characteristics of independent two induction motor drives fed by a four-leg inverter , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[5]  M. Jones,et al.  A performance comparison of PWM techniques for five-leg VSIs supplying two-motor drives , 2008, 2008 34th Annual Conference of IEEE Industrial Electronics.

[6]  Drazen Dujic,et al.  Five-leg inverter PWM technique for reduced switch count two-motor constant power applications , 2008 .

[7]  K. Matsuse,et al.  Independent vector control of two PM motors with five-leg inverter by the expanded two-arm modulation method , 2005, 2005 European Conference on Power Electronics and Applications.

[8]  Kouki Matsuse,et al.  Characteristic of Independent Two AC Motor Drives Fed by a Five-Leg Inverter , 2009, 2009 IEEE Industry Applications Society Annual Meeting.

[9]  M. Jones,et al.  A two-motor centre-driven winder drive with a reduced switch count , 2008, 2008 34th Annual Conference of IEEE Industrial Electronics.

[10]  F. Blaabjerg,et al.  Controller design for direct torque controlled space vector modulated (DTC-SVM) induction motor drives , 2005, Proceedings of the IEEE International Symposium on Industrial Electronics, 2005. ISIE 2005..

[11]  A. Tani,et al.  FOC and DTC: two viable schemes for induction motors torque control , 2002 .

[12]  M.P. Kazmierkowski,et al.  Reliable Direct Torque Control with Flux Vector Modulation (DTC-FVM) for AC Motors , 2007, 2007 IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives.

[13]  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).

[14]  Y. Fujimoto,et al.  Inverter with Reduced Switching-Device Count for Independent AC Motor Control , 2007, IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society.

[15]  Marian P. Kazmierkowski,et al.  Direct torque control of PWM inverter-fed AC motors - a survey , 2004, IEEE Transactions on Industrial Electronics.