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| Vector Control System of Electrically Excited Synchronous Motor Fed by Back-to-Back Dual Three-Level Converter |
| Tan Guojun, Wu Xuanqin, Li Hao, Jing Wei, Liu Meng |
| China University of Mining and Technology Xuzhou 221008 China |
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Abstract The vector control strategy for electrically excited synchronous motor fed by back-to-back dual three-level converter is studied in this paper. In order to improve the control system’ s performance, a novel full-order closed-loop air gap flux estimator suitable for full speed range is proposed and analyzed, in which the smooth switching principle between current model and voltage model is declared. Three-level converter with active front end can achieve unity power factor and low gird side’ s harmonic distortions, as well as bi-directional energy flow. Meanwhile, on the basis of neutral point potential self-adaptation control, the simplified three-level space-vector pulse width modulation (SVPWM) strategy is adopted. Furthermore, a novel method of voltage estimation at the three-level power converter is proposed based on this simplify modulation. Field operation results demonstrate that the solutions of the vector control strategy for electrically excited synchronous motor based on Back-to-Back dual three-level converter has excellent control performance, truly realizing energy saving and environment protection.
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Received: 27 November 2009
Published: 07 March 2014
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2011, Vol. 26 
