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Energies 2016, 9(11), 966; doi:10.3390/en9110966

Study on the Static Load Capacity and Synthetic Vector Direct Torque Control of Brushless Doubly Fed Machines

School of Electrical Engineering and Automation, Tianjin University, No. 92 Weijin Road, Tianjin 300072, China
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Author to whom correspondence should be addressed.
Academic Editor: K.T. Chau
Received: 27 June 2016 / Revised: 7 November 2016 / Accepted: 8 November 2016 / Published: 18 November 2016
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Abstract

Compared to the doubly fed machine, the brushless doubly fed machine (BDFM) has high reliability and low maintenance requirements. First, by taking the negative conjugation of the control motor variables in rotor reference frame, a state-space model of BDFM is derived. It is then transformed into synchronous reference frame, called synchronous reference frame state-space model (SSSM). In this way, all the variables of the SSSM are DC under the static state. Second, on the basis of the analysis of static equations, the possible output torque limits are obtained. Third, the causes of losing control are analyzed by the flux and the torque derivatives. A new control strategy called synthetic vector direct torque control (SVDTC) is proposed to solve the losing control problems of the conventional direct torque control (DTC). Finally, the correctness of the results of this paper is verified by calculation examples and simulation results, the losing control problems can be solved, and the theoretical output capacity limits can be reached using SVDTC. View Full-Text
Keywords: brushless doubly fed machine (BDFM); state-space model; load capacity; losing control; synthetic vector direct torque control (SVDTC) brushless doubly fed machine (BDFM); state-space model; load capacity; losing control; synthetic vector direct torque control (SVDTC)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Xia, C.; Hou, X. Study on the Static Load Capacity and Synthetic Vector Direct Torque Control of Brushless Doubly Fed Machines. Energies 2016, 9, 966.

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