Simulink Model of Direct Torque Control of Induction Machine
ABSTRACT
Direct torque control
(DTC) is one of the most excellent control strategies of torque control in
induction machine. It is considered as an alternative to the field oriented
control (FOC) or vector
control
technique. These two control strategies are different on the operation
principle but their
objectives
are the same. They aim to control effectively the torque and flux. Torque
control of an
induction
machine based on DTC strategy has been developed and a comprehensive study is
present in this research. The performance of this control method has been
demonstrated by simulations performed using a versatile simulation package,
Matlab/Simulink. Several numerical simulations have been carried out in a
steady state and transient operation on a speed control mode.
KEYWORDS
1. Direct torque
control
2. Induction
machine
3. Vector
control
4. Matlab/Simulink
SOFTWARE:
Matlab/Simulink
BLOCK DIAGRAM:
Fig.1 Direct torque
control of induction machine
Fig. 2: Developed model of
direct torque control of induction machine
CONCLUSION:
The
work carried out in this paper is aimed and focused to develop a direct torque
control simulink model. The DTC architecture allows the independent and
decoupled control of torque and stator flux. The implementation of the DTC
model has been deeply described and justified its realization. In order to show
the effectiveness of the model, a numerical simulation has been performed on a
7.5 kW induction machine fed by an IGBT PWM inverter. The feasibility and the
validity
of the developed DTC model, based on switching table technique, have been
proved by simulation results obtained in the torque control mode.
REFERENCES:
1. Casadei,
D., G. Gandi, G. Serra and A. Tani, 1994. Effect of flux and torque hysteresis
band amplitude in direct torque control of Induction Machine. Proc. IECON’94,
Bologna, Italy, 299-304.
2. Casadei, D., F. Profumo, G. Serra and A. Tani,
2002. FOC and DTC: two viable schemes for induction motors torque control. IEEE
Trans. Power Electronics, 17(5): 779-787.
3. 3.
Chapuis, Y.A. and D. Roye, 1998. Direct torque control and current limitation
method in start up of an induction machine. IEE Conf. Power Electronics and
Variable Speed Drives, 451-455
4. 4.
Takahashi, I. and Y. Ohmori, 1989. High Performace direct torque control of
induction motor. IEEE Trans. Ind. Appl. 25 (2): 257-264.
5. Vas, P., 1990. Vector Control of a.c.
machines.Oxford University Press.
