ABSTRACT:
Induction motor drives are at the heart of modern industrial
and commercial applications. With conventional control techniques, induction
motor drives have shown less than expected dynamic performance. With vector
control techniques emerging as potential replacement in induction motor drives,
this paper aims at highlighting various vector control strategies. Direct and
indirect vector controls along with sensorless vector control are presented.
Various speed control techniques are presented through the use of conventional
controllers and Intelligent Controllers. A critical analysis and comparison is made
with other control strategies.
KEYWORDS:
1.
Field oriented control
2.
Sensorless vector control
3.
Direct torque control
4.
Modulation
5.
Parameter estimation
SOFTWARE: MATLAB/SIMULINK
Fig.
1. Block diagram of general vector control scheme
CONCLUSION:
The use of vector control has been presented
for Induction motor drives. A number of vector control schemes have been presented
with merits and demerits of each. Different controllers (conventional and
intelligent controllers) have been used in various schemes of vector control
strategy. Potentially DTC is proving to be superior to other vector control techniques.
Contrast to field oriented controller, it is more robust, does not require any
transformation, current controller, or rotor position measurement. However, an
improvement in torque ripples is the demand of this scheme. Sensorless vector control
offers low cost and more reliability, but operation of this scheme in low speed
region is one of its biggest drawbacks.
REFERENCES:
[1]
Bimal. K.Bose (2002) – “Modern Power Electronics & AC Drives”, Prentice
Hall, ISBN 0-13-016743-6
[2]
Rupprecht Gabriel. Werner Leonhard, and Craig J. Nordby, “Field- Oriented
Control of a Standard AC Motor Using Microprocessors”, IEEE Transactions On
Industrial Applications, Vol. IA-16, No. 2, pp. 186-192, March/April 1980.
[3]
Masato Koyama, Masao Yano, Isao Kamiyama, And Sadanari Yano, “Microprocessor-Based
Vector Control System For Induction Motor Drives With Rotor Time Constant
Identification Function”, IEEE Transactions on Industry Applications,
Vol. IA-22, No. 3, pp. 453-459, May/June 1986.
[4]
Ramu Krishnan, and Aravind S. Bharadwaj, “A review of parameter sensitivity and
adaptation in indirect vector controlled induction motor drive systems”, IEEE
transactions on power electronics, Vol. 6, No. 1, pp.695-703, October 1991.
[5]
Luis J. Garces, “Parameter Adaption for the Speed-Controlled Static AC Drive
with a Squirrel-Cage Induction Motor”, IEEE Transactions on Industry
Applications, Vol. IA-16, no. 2, pp. 173 -178, March/April 1980.
