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Vol: 52(66) No: 3 / September 2007 Grid Connection Control Mode of a Small Variable-Speed Wind Turbine Lucian Mihet-Popa Department of Electrical Machines and Drives, “Politehnica” University of Timisoara, Faculty of Electrical Engineering, B-vdl. V. Parvan, no. 2, 300223 Timisoara, Romania, phone: +40-256-403464, e-mail: mihetz@yahoo.com Keywords: back-to-back PWM-VSI, LCL-filter, induction generator, root locus, variable-speed wind turbine, zero-order hold Abstract In this paper, the performance of a variable speed wind turbine concept with a cage rotor induction generator connected to the grid is investigated. Variable-speed wind turbine generator system with a vector controlled back-to-back PWM-VSI on the stator side has been modeled, designed and simulated to study their steady state and dynamic behavior. The grid connection control mode of a wind turbine based on a flexible dSPACE digital signal processor system that allows user-friendly code development, monitoring and online tuning is used. The design of an LCL-filter, current controller and DC-link voltage controller are described in detail. References [1]R. Teodorescu and F. Blaabjerg, “Flexible control of small wind turbines with grid failure detection operating in stand-alone and grid-connected mode”, IEEE Transactions on Power Electronics, vol. 19, No. 5, pp. 1323 – 1332, September 2004. [2]R. Pena, R. Cardenas, R. Blasco, G. Asher and J. Clare, “A cage induction generator using back-to-back PWM converters for variable speed grid connected wind energy system”, Proceedings of IECON 2001, vol. 2, pp. 1376 – 1381, 2001. [3]L. Mihet-Popa, V. Groza, G. Prostean, I. Filip and I. Szeidert, “Variable speed wind turbines using cage rotor induction generators connected to the grid”, Proceedings of EPC 2007, vol. III, , pp. 271 – 279, Montreal-Canada 2007. [4]L. Mihet-Popa, F. Blaabjerg and I. Boldea, ”Wind Turbine Generator Modeling and Simulation where Rotational Speed is the Controlled Variable”, IEEE-IAS Transactions on Energy Conversion, January / February 2004, Vol. 40, No. 1.. [5]L. Mihet-Popa, “Wind Turbines using Induction Generators connected to the grid”, Ph. D Thesis, Timisoara, October 2003. [6]A. Tewari, Modern Control Design with MATLAB and Simulink, New York: Wiley, 2002. [7]S. K. Chung, “Phase-locked loop for grid-connected three-phase power conversion systems”, Proceedings of Inst. Elec. Eng, Vol. 147, No. 3, pp. 213-219, May 2000. [8]R. Otterbach, T. Pohlmann, “DS1103 PPC controller board-rapid prototyping with combined RISK and DSP power for motion control”, Proceedings of PCIM’98, Nurnberg-Germany. [9]M. Liserre, F. Blaabjerg and S. Hansen, ”Design and Control of an LCL-filter-Based Three-Phase Active Rectifier”, IEEE Transactions on Industry Applications, Vol. 41, No. 5, September/October 2005, pp. 1281-1291. |