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| Direct Torque Control for Brushless Doubly-Fed Induction Machine in Static Reference Frame |
| Zhang Ailing, Jia Wenxia, Zhou Zanqiang, Wang Xin, Wang Jianhua |
| Taiyuan University of Technology Taiyuan 030024 China |
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Abstract A direct torque control(DTC) strategy in static reference frame for brushless doubly-fed induction machine is presented in this paper. The estimation method for electromagnetic torque is deduced, that is, to observe fluxes and currents of power winding(PW) and control winding (CW) in the local αβ reference frame respectively, and then estimating the torque. Thus rotation coordinate transformation is prevented and parameters used in system are reduced. In addition, the switch table applied to both sub-synchronous and super-synchronous is constructed. The system’s structure is as simple as that for the DTC of induction machine, except that voltage and current of one more stator winding are required. The experimental results on a prototype show that the estimation of torque is stable, the speed for BDFIM is stably controlled from super-synchronous to sub-synchronous, and the controller can stabilize the system and maintain the desired speed when sudden torque changes are applied.
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Received: 19 August 2011
Published: 20 March 2014
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2012, Vol. 27 
