ENHANCED SPACE VECTOR MODULATED SCALAR CONTROL OF INDUCTION MOTOR

George S Fernandez

Abstract


In the conventional method, vector control of the asynchronous machine is to make an analogy of it, equivalent to a separately excited DC machine. It offers a decoupled control of torque and flux which is perpendicular to each other hence one vector is not interfered by other. So, torque and speed control is achieved in an isolated manner even though they are closely interlinked. This is implemented by aligning the rotor flux with the direct axis of the synchronously rotating reference frame. PI controllers play a key role to achieve the desired topology of the VFD. Three controllers are used in the system, flux, speed and torque controller. Tuning of flux controller is quite simple, but in case of speed and torque, it became quite tricky because the output of the speed controller is the reference signal of torque controller. Moreover, there is no distinct method to tune the controllers in the vector control system. Still, the entire high-performance dynamic response of the machine depends on the perfect tuning of those controllers. From the above analysis, it is understood that system identification is essential to tune the PI controllers. But being an asynchronous machine, to obtain system transfer function in a decoupled manner is very difficult. To overcome this problem, the proposed model will be Conventional sine PWM modulated switching pulses are used to implement variable frequency drives for induction motor. Space vector modulated PWM switching pulse is used to fire IGBT. In the case of sine, PWM modulated switching; DC bus voltage utilization is 50% whereas in space vector modulated inverter 57.73% DC Bus voltage utilization can be achieved. Even though in low voltage application, it may not contribute significantly but in case of medium voltage application, it contributes meaningfully. At mega 2560 micro-controller is used to generate the switching pulses using the timers with phase correct PWM mode to provide a dead time of the complementary switchers of each phase. The high-performance dynamic response of the machine is depended on the perfect tuning of the three PI regulators. For anti-windup and overshoot, free tuning requires lower order, simplified and decoupled transfer function for its small-signal model and its linearization. It this paper, higher-order transfer functions are reduced to the first-order system, made decoupled and tuned ideally using Simulink toolbox. Space vector modulated scalar control of induction motor technique is preferred, which eliminates the complexity of PI tuning.


References


B.K Bose "Modern power electronics and ac drives "Prentice-Hall OJ India, New Delhi, 2008.

M.Masiala;B.Vafakhah,;A.Knght,;J.Salmon,;"Performance of PI and fuzzy logic speed control of field-oriented induction motor drive," CCECE , jul. 2007, pp. 397-400.

F.Barrero;A.Gonzalez;A.Torralba,E.Galvan,;L.G.Franquelo;"Speed control of induction motors using a novel Fuzzy-sliding mode structure, "IEEE Transaction on Fuzzy system, vol. 10, no.3,pp.383,

H.F.Ho,K.W.E.Cheng, "position control of induction motor using indirect adaptive fuzzy sliding mode control," P ESA, , Sep. 2009, pp. 1-5.

R.J. Wai, "Fuzzy sliding-mode control using adaptive tuning technique," IEEE Transaction on Industrial Electron, vol. 54, no.1, pp. 586-594, Feb. 2007

F.J.Lin, H.M.Su.and H.P . Chen, "Induction motor servo drive with adaptive rotor time- constant estimation," IEEE Transaction on Aerospace Electronic system, vol. 34, pp. 224-234, Jan. 1998.

V.I.Utkin, "Sliding mode control design principle and application to electric drives," IEEE Transaction on Industrial Electronics, vol. 40, no. 1 , pp. 23-36, Feb. 1993.

A. Derdiyok, “Speed-sensorless control of induction motor using continuous control approach of sliding-mode and flux observer,” IEEE Trans. on Industrial Electronics, vol. 52, No. 4, August 2005, pp. 140-148.

A. Abbondanti, M. B. Brennen, “Variable speed induction motor drives use electronic slip calculator based on motor voltages and currents,” IEEE Trans. Industrial Applications, vol.11, 1975, pp. 483-488.

C. C. Chan, H. Q. Wang, “New scheme of sliding mode control for high performance induction motor drives,” IEE Proc. on Electric Power Applications, vol. 143, no. 3, May 1996, pp. 177-185.

CristianLascu, Ion Boldea, Fellow, IEEE, and Frede Blaabjerg, Fellow, IEEE,” Direct Torque Control of Sensor less Induction Motor Drives: A Sliding-Mode Approach”, ieee transactions on industry applications, vol. 40, no. 2, march/april 2004

Chan, C. C., and H. Q. Wang, “New scheme of sliding mode control for high performance induction motor drives,” IEE Proc. on Electric Power Applications, vol. 143, no. 3, May 1996, pp 177- 185.

Chan C. C., Leung W. S. and C. W. Nag, “ Adaptive decoupling control of induction motor drives,” IEEE Transaction on Industrial Electronics, vol. 35, no. 1, Feb. 2010, pp.41-47.

S.G. Jeong and M.H. Park, "The Analysis and Compensation of Dead-Time Effects in PWM Inverter," IEEE Transaction s on Industrial Electronics, Vol. 38, Issue 2, April 1991 pp. 108-114.

R. Parekh, "VF Control of three phase Induction Motor using Space Vector Modulation" Microchip Technology Incorporated, 2005.

Atmel Corporation, "AVR495: AC Induction Motor Control using the Constant V/f Principle and a Space Vector PWM Algorithm," 2005

D.G. Holmes, "The General Relationship between Regular-Sampled Pulse-Width-Modulation and Space Vector Modulation for Hard Switched Converters", IEEE Industrial Society Annual Meeting, Vol. 1, pp 1002-1009, 1992

M.H. Rashid, "Power Electronics: Circuits, Devices and Applications", Pearson Education, Singapore, 2005.

Anhar Azeez Sagger," Field Oriented Control of an Induction Motor Based on a Single –Phase to Three – Phase Indirect Matrix Converter", University of Technology, Iraq, MSc. thesis, June 2016.

Riya Elizabeth Jose, Maheswaran K.," V/F Speed Control of an Induction Motor Drive Fed by Switched Boost Inverter", International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, Vol. 4, Issue 8, August 2015.




DOI: http://doi.org/10.11591/ijeecs.v20.i3.pp%25p
Total views : 16 times

Refbacks

  • There are currently no refbacks.


Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

shopify stats IJEECS visitor statistics