Direct torque control of induction motors using fuzzy variable switching sector

The direct torque control (DTC) scheme provides very quick torque response without the complex field-orientation block and inner current control loop. DTC is known as an appropriate scheme for high power induction motor drives because it can be used at lower switching frequency. There are two major drawbacks with the application of DTC schemes : flux drooping in low speed range and time varying inverter switching frequency. In this paper, a fuzzy variable switching sector scheme to prevent flux drooping, and a fuzzy switching frequency regulator for lowering the switching frequency are proposed and adopted in the DTC based induction motor drive system. An important contribution of this paper is the proposition of simple realization schemes of the fuzzy switching frequency regulator and the fuzzy variable switching sector.

[1]  A. M. Walczyna.  Problems of application of direct flux and torque control methods to high power VSI-fed drives operating at low speed , 1994, Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics.

[2]  Sanjib Kumar Panda,et al.  Direct torque control of induction motor-variable switching sectors , 1999, Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems. PEDS'99 (Cat. No.99TH8475).

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

[4]  M. Mizumoto.  Realization of PID controls by fuzzy control methods , 1995 .

[5]  A. Tani,et al.  Effects of flux and torque hysteresis band amplitude in direct torque control of induction machines , 1994, Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics.

[6]  Selênio Rocha Silva,et al.  Vector control of voltage fed three-phase inverters variable switching regions , 1994, Proceedings of 1994 Power Electronics Specialist Conference - PESC'94.

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

[8]  Masaharu Mizumoto,et al.  PID type fuzzy controller and parameters adaptive method , 1996, Fuzzy Sets Syst..

[9]  Giuseppe Buja,et al.  Analytical formulation of the direct control of induction motor drives , 1999, ISIE '99. Proceedings of the IEEE International Symposium on Industrial Electronics (Cat. No.99TH8465).

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