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Vol: 51(65) No: 3 / September 2006 Optimal Operation of Railway Induction Traction Motor Using Extremum Control Rodica Festila Department of Automatic Control, Technical University of Cluj-Napoca, Faculty of Automation and Computer Science, Baritiu Str. 26-28, 400027 Cluj-Napoca, Romania, e-mail: Rodica.Festila@aut.utcluj.ro Eva Dulf Department of Automatic Control, Technical University of Cluj-Napoca, Faculty of Automation and Computer Science, Baritiu Str. 26-28, 400027 Cluj-Napoca, Romania, e-mail: Eva.Dulf@aut.utcluj.ro Clement Festila Department of Automatic Control, Technical University of Cluj-Napoca, Faculty of Automation and Computer Science, Baritiu Str. 26-28, 400027 Cluj-Napoca, Romania, e-mail: Clement.Festila@aut.utcluj.ro Keywords: extremum control system, induction traction motor control, railway application. Abstract One possibility for the optimal operation of the induction motor is achieved by keeping the total losses at a minimum level, a practical solution being the extremum control. The key-element for the successful application of the extremum control system is the slope identification in order to solve the ambiguity, inherent by a nonlinear static curve with extremum. Using some original solutions, the paper deals with the application of the extremum control systems in the speed control of the induction motor used in railway traction, in order to improve the efficiency. Validity of the proposed solutions is proved by numerical simulation using SIMULINK. In the paper is emphasized the importance of the active losses resistance (Rc). References [1] K. Ariyur and M. Krstic, Real Time Optimization by Extremum Seeking Control, Wiley Interscience, 2003. [2] V. Tulbure, Contributions Regarding Asynchronous Motor. Control in Railway Tractions, PhD Thesis (in Romanian), Technical University of Cluj-Napoca, 2003. [3] R. Festila et al., “Quasi-extremum scalar control for induction traction motors. Results of simulation”, Proceedings of SINTES 2005 International Conference, Craiova, 2005. [4] M. Krstic and H. H. Wang, “Stability of extremum seeking feedback for general nonlinear dynamic systems”, Automatica, 2000, vol. 36, pp. 596-601. [5] K. Ariyur and M. Krstic, “Slope seeking: a generalization of extremum seeking”, International Journal of Adaptive Control and Signal Processing, 2004, vol. 18, pp. 1-22. [6] M. Gafvert et al., “Simple liniar feedback and extremum control of GDI Engine”, Proceedings of FISITA World Automative Congress, Seoul, paper index F2000A050, 2000. |