DTC of open-end winding induction motor drive using space vector modulation with reduced switching frequency

A new control strategy for reducing the switching frequency of direct torque controlled (DTC) induction motor with open-end winding configuration is proposed. Two independent two-level inverters are feeding both ends of the three-phase stator winding. In order to achieve the required voltage vector, one of the inverters is clamped to a particular voltage vector for a minimum of one sampling interval, while the other one is controlled using space vector PWM technique. This arrangement applies a 3-level line voltage waveform to the machine. Since this configuration is generally used in high power applications, the effective switching frequency of one of the inverters is reduced. Also, isolating the input DC source of the inverters can eliminate the flow of zero sequence current. Hence a significant reduction in size and improvement in overall efficiency is achieved. Simulation studies have been carried out for the proposed scheme and results are compared with the conventional space vector PWM-DTC by taking the equivalent 2-level inverter into account.

[1]  Keith Corzine,et al.  Performance characteristics of a cascaded two-level converter , 1999 .

[2]  Takao Kawabata,et al.  New open-winding configurations for high-power inverters , 1997, ISIE '97 Proceeding of the IEEE International Symposium on Industrial Electronics.

[3]  Takao Kawabata,et al.  High-efficiency and low acoustic noise drive system using open-winding AC motor and two space-vector-modulated inverters , 2002, IEEE Trans. Ind. Electron..

[4]  K. Gopakumar,et al.  Space vector PWM control of dual inverter fed open-end winding induction motor drive , 2001, APEC 2001. Sixteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.01CH37181).

[5]  I. Takahashi,et al.  High-performance direct torque control of an induction motor , 1989 .

[6]  Andreas Steimel,et al.  Direct self control with minimum torque ripple and high dynamics for a double three-level GTO inverter drive , 2002, IEEE Trans. Ind. Electron..

[7]  Peter Vas,et al.  Sensorless vector and direct torque control , 1998 .

[8]  K. Gopakumar,et al.  PWM inverter switching strategy for a dual two-level inverter fed open-end winding induction motor drive with a switched neutral , 2002 .

[9]  Andreas Steimel,et al.  Direct self control of induction machines fed by a double three-level inverter , 1997, IEEE Trans. Ind. Electron..

[10]  Toshihiko Noguchi,et al.  A New Quick-Response and High-Efficiency Control Strategy of an Induction Motor , 1986, IEEE Transactions on Industry Applications.

[11]  M. Depenbrock,et al.  Direct self-control (DSC) of inverter-fed induction machine , 1988 .

[12]  H. Stemmler,et al.  Configurations of high-power voltage source inverter drives , 2002 .

[13]  Chang Ho Choi,et al.  A new simplified space-vector PWM method for three-level inverters , 2001 .

[14]  B. A. Welchko,et al.  A comparative evaluation of motor drive topologies for low-voltage, high-power EV/HEV propulsion systems , 2003, 2003 IEEE International Symposium on Industrial Electronics ( Cat. No.03TH8692).