Sensorless Vector Control of Induction Generators for Variable-Speed Wind Turbines Using Micro-2407
- 1 Sit, Bbsr, Bput, India
- 2 Sit, Bbsr, Bput, India
- 3 Oec, Bbsr, Bput, India
Abstract
A sensorless vector-control strategy for an induction generator in a grid-connected wind energy conversion system is presented. The sensorless control system is based on a model reference adaptive system (MRAS) to estimate the rotational speed. In order to tune the MRAS observer and compensate for the parameter variation and uncertainties, a separate estimation of the speed is obtained from the rotor slot harmonics using an algorithm for spectral analysis. This algorithm can track fast dynamic changes in the rotational speed, with high accuracy. Two back to back pulse width modulated (PWM) inverters are used to interface the induction generator with the grid. The front-end converter is also vector controlled. The dc link voltage is regulated using a PI fuzzy controller. The proposed sensorless control strategy has been experimentally verified on a 2.5-kW experimentally set up with an induction generator driven by a wind turbine emulator. The emulation of the wind turbine is performed using a novel strategy that allows the emulation of high-order wind turbine models, preserving all of the dynamic characteristics. The experimental results show the high level of performance obtained with the proposed sensorless vector-control method.
- R. S. Pena, R. J. Cardens, G. M. Asher and J. C. Clare, “Vector Controlled Induction Machines for Stand-Alone Wind Energy Applications,” IEEE Industry Applications Society Annual Meeting, Rome, Vol. 3, 2000, pp. 1409- 1415.
- M. Simoes, B. Bose and R. Spigel, “Fuzzy Logic Based Intelligent Control of a Variable Speed Cage Induction Machine Wind Generation System,” IEEE Transactions on Power Electronics, Vol. 12, No. 1, 1997, pp. 87-95. doi:10.1109/63.554173
- B. Bose, “Energy, Environment, and Advances in Power Electronics,” IEEE Transactions on Power Electronics, Vol. 15, No. 4, 2000, pp. 688-701. doi:10.1109/63.849039
- C. Schauder, “Adaptive Speed Identification for Vector Control of Induction Motors without Rotational Transducers,” IEEE Transactions on Industry Applications, Vol. 28, No. 5, 1992, pp. 1054-1061. doi:10.1109/28.158829
- R. Blasco-Gimenez, G. M. Asher and M. ummer, “Dynamic Performance Limitations for MRAS Based Sensorless Induction Motor Drives, Part 1: Stability Analysis for the Closed Loop Drive,” Electric Power Applications, Part B, Vol. 143, No. 2, 1996, pp. 113-122.
- R. Blasco-Gimenez, G. M. Asher, M. Summer and K. J. Bradley, “Dynamic Performance Limitations for MRAS Based Sensorless Induction Motor Rives, Part II: Online Parameter Tuning and Dynamic Performance Studies,” Electric Power Applications, Part B, Vol. 143, No. 2, 1996, pp. 123-134. doi:10.1049/ip-epa:19960105
- J. Jiang and J. Holtz, “High Dynamic Speed Sensor Less AC Drive with On-Line Model Parameter Tuning for Steady-State Accuracy,” IEEE Transactions on Industrial Electronics, Vol. 44, No. 2, 1997, pp. 240-246. doi:10.1109/41.564163
- A. Ferrah, K. J. Bradley. P. J. Hogben-Laing, M. S. Woolfson, G. M. Asher, M. Sumner, J. Cilia and J. Shuli, “A Speed Identifier for Induction Motor Drives Using Real-Time Adaptive Digital Filtering,” IEEE Transactions on Industry Applications, Vol. 34, No. 1, 1998, pp. 156-162. doi:10.1109/28.658741
- A. Miller, E. Muljadi and D. Zinger, “A Variable Speed Wind Turbine Power Control,” IEEE Transactions on Energy Conversion, Vol. 12, No. 2, 1997, pp. 181-186. doi:10.1109/60.629701
- E. Muljadi and C. Butterfield, “Pitch-Controlled Variable-Speed Wind Turbine Generation,” IEEE Transactions on Industry Applications, Vol. 37, No. 1, 2001, pp. 240-246. doi:10.1109/28.903156
- M. Steinbuch, “Optimal Multivariable Control of a Wind Turbine with Variable Speed,” Wind Engineering, Vol. 11, No. 3, 1987, pp. 153-163.