An Improved MRAS Based Sensorless Vector Control Method for Wind Power Generator

 

B. Dumnic*¹, V. Katic², V. Vasic³, D. Milicevic⁴, M. Delimar⁵

 

^1,2,3,4 Faculty of Technical Sciences, Department of Power and Electronic Engineering University of Novi Sad, Novi Sad, Serbia. *dumnic@uns.ac.rs.

⁵ Faculty of Electrical Engineering and Computing, Department of Power Systems University of Zagreb Zagreb, Croatia.

 

Abstract

This paper describes an improved sensorless vector control strategy for a squirrel cage induction generator used in variable speed wind energy conversion systems (WECS). The main goal is to design a robust control algorithm immune to generator parameter variations. In order to estimate the rotational speed of the induction generator, a model reference adaptive system (MRAS observer) is used. It is shown that a generator parameter mismatch has a great influence on the rotor speed estimation. In order to estimate the speed accurately, the generator stator resistance must be identified at the same time to correct the mismatched resistance value used in the observer. The proposed rotor speed estimator with parallel stator resistance identification is first verified by computer simulation. Finally, the experiment is conducted in order to verify the obtained simulation results. It is proved that this control scheme can enhance the efficiency of a variable speed WECS.

Keywords: generators, machine vector control, parameter estimation, sensorless control, wind power generation.

 

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Acknowledgements

This paper is a result of the scientific project No. III 042004 of Integrated and Interdisciplinary Research entitled "Smart Electricity Distribution Grids Based on Distribution Management System and Distributed Generation" funded by Republic of Serbia, Ministry of Education and Science.

 

References

[1] D. Hansen, H. Hansen, "Wind Turbine Concept Market Penetration over 10 Years", Wind Energy, vol. 10, pp. 81-97, Nov. 2006. Available: http://dx.doi.org/10.1002/we.210.         [ Links ]

[2] T. Ahmed et al., "Advanced Control of PWM Converter With Variable-Speed Induction Generator", IEEE Trans. on Industry Application, vol. 42, no. 4, pp. 934-945, Jul./Aug. 2006. Available:http://dx.doi.org/10.1109/TIA.2006.876068.         [ Links ]

[3] Z. Chen et al., "A Review of the State of the Art of Power Electronics for Wind Turbines", IEEE Transactions on Power Electronics, Vol. 24, no. 8, August 2009. Available: http://dx.doi.org/10.1109/TPEL.2009.2017082.         [ Links ]

[4] A. Miller et al., "A Variable Speed Wind Turbine Power Control", IEEE Trans. on Energy Conversion, vol. 12, no. 2, pp. 181-186, Jun. 1997. Available: http://dx.doi.org/10.1109/60.629701.         [ Links ]

[5] R. Decher, "Energy Conversion: Systems, Flow physics and Engineering", Oxford University Press, New York, 1994.         [ Links ]

[6] F. Blaabjerg et al., "Trends in Power Electronics and Control of Renewable Energy Systems", Proceedings of 14th International Power Electronics and Motion Control Conference, K1-K19, EPE-PEMC 2010.         [ Links ]

[7] P. Vas, "Sensorless Vector and Direct Torque Control", Oxford University Press, New York 1998.         [ Links ]

[8] M. Hinkkanen et al., "Reduced-Order Flux Observers With Stator-Resistance Adaptation for Speed-Sensorless Induction Motor Drives", IEEE Trans. on Power Electronics, Vol. 25, no.5, May 2010. Available: http://dx.doi.org/10.1109/TPEL.2009.2039650.         [ Links ]

[9] V. Vasic et al., "A Stator Resistance Estimation Scheme for Speed Sensorless Rotor Flux Oriented Induction Motor Drives", IEEE Trans. on Energy Conversion, vol. 18, no. 4, pp. 476-483, Dec. 2003. Available: http://dx.doi.org/10.1109/TEC.2003.816595.         [ Links ]

[10] F. Kulic et al., "Optimal Fuzzy Controller Tuned by TV-PSO for Induction Motor Speed Control", Advances in Electrical and Computer Engineering, vol. 11, no. 1, pp. 49-54, 2011. Available: http://dx.doi.org/10.4316/AECE.2011.01008.         [ Links ]

[11] B. Wu et al., "Power Conversion and Control of Wind Energy Systems", IEEE press, NJ, 2011.         [ Links ]

[12] R. Cardenas, R. Pena, "Sensorless Vector Control of Induction Machines for Variable-Speed Wind Energy Applications", IEEE Trans. on Energy Conversion, vol. 19, no. 1, pp. 196-205, March 2004. Available: http://dx.doi.org/10.1109/TEC.2003.821863.         [ Links ]

[13] T. Senjyu et al., "Wind Velocity and Rotor Position Sensorless Maximum Power Point Tracking Control for Wind Generation System", pp. 1764-1775. Renewable Energy 31, 2006.         [ Links ]

[14] M. Tsuji et al., "A Sensorless Vector Control System for Induction Motors Using q-Axis Flux with Stator Resistance Identification", IEEE Trans. on Industrial Electronics, vol. 48, no. 1, pp. 185-194, Feb. 2001.         [ Links ]

[15] E. Mitronikas, A. Safacas, "An Improved Sensorless Vector-Control Method for an Induction Motor Drive", IEEE Trans. on Industrial Electronics, vol. 52, no. 6, pp. 1660-1668, Dec. 2005. Available: http://dx.doi.org/10.1109/TIE.2005.858706.         [ Links ]

[16] L. Mihet-popa, V. Groza, "Modeling and Simulation of a 12 MW Wind Farm", Advances in Electrical and Computer Engineering, vol. 10, no. 2, pp. 141-144, 2010. Available: http://dx.doi.org/10.4316/AECE.2010.02025.         [ Links ]

[17] V. Calderaro et al., "A Fuzzy Controller for Maximum Energy Extraction from Variable Speed Wind Power Generation Systems", Electric Power Systems Research, Volume 78, Issues 6, pp.1109-1118, June 2008.         [ Links ]

[18] B. Dumnic et al., "Optimal MRAS Speed Estimation for Induction Generator in Wind Turbine Application", The 15th IEEE Mediterranean Electromechanical Conference-MELECON 2010, April 25th - 28th, 2010, Valletta, Malta, pp. 949-954, IEEE Catalog Number CFP10MEL-CDR.         [ Links ]

[19] K. Johnson, "Adaptive Torque Control of Variable Speed Wind Turbines", National Renewable Energy Laboratory, Colorado, 2004. Available: http://dx.doi.org/10.2172/15008864.         [ Links ]

[20] B. K. Bose, "Modern Power Electronics and AC Drives", Prentice Hall PTR, NJ, 2001.         [ Links ]

[21] J. Holtz, "Perspectives of Sensorless AC Drive Technology", 27th International PCIM Europe, Nuremberg, 2005, pp. 80-87, Jun. 2005.         [ Links ]

[22] C. Schauder, "Adaptive speed identification for vector control of induction motors without rotational transducers", IEEE Transaction on Industry Applications, No. 5, pp. 1054-1061, 1992. Available: http://dx.doi.org/10.1109/28.158829.         [ Links ]

[23] A. Paladugu, B. H. Chowdhury, "Sensorless control of inverter-fed induction motor drives", Electric Power Systems Research, Volume 77, Issues 5-6, pp. 619-629, April 2007.         [ Links ]

[24] R. Teodorescu et al., "Advanced Education Facilities for Power Electronics and Renewable Energy Systems at Aalborg University", The International Power Electronics Conferences - IPEC 2005, April 6th - 10th, Niigata, Japan, pp. 533-540.         [ Links ]

[25] M. A. Arjona et al., "Development of a Synchronous-Generator Experimental Bench for Standstill Time-Domain Tests", Journal of Applied Research and Technology, Vol.9, No.2, pp. 117-128, August 2011.         [ Links ]

[26] dSpace, "Solutions for Control, DS1104 R&D Controller Board", Paderborn, Germany, 2008.         [ Links ]