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| Direct Torque Control for Brushless Doubly-Fed Wind Power Generator Based on Speed Sensorless |
| Zhang Fengge, Jin Shi, Zhang Wu |
| Shenyang University of Technology Shenyang 110870 China |
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Abstract A maximal power tracking method through controlling torque and power factor of brushless doubly-fed wind power generator to regulate active power is proposed based on direct torque control (DTC), according to the power output characteristics of wind turbine. Considering the complicated relation of internal magnetic fields of brushless doubly-fed generator(BDFG), a novel speed observer is designed by estimating the rotor flux synchronous rotating speed and slip speed to improve the reliability of wind power generation system in harsh wind field environment. Furthermore, the model reference adaptive identification technology is adopted to design control winding flux observer in order to enhance the accuracy of estimated flux within wide speed range and further to improve the operation performance of the DTC system at the low frequency of the control winding. Simulation results prove the validity and feasibility of the proposed novel speed estimation method and DTC scheme.
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Received: 28 October 2010
Published: 10 March 2014
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2011, Vol. 26 
