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Energies 2018, 11(1), 71;

Flux-Angle-Difference Feedback Control for the Brushless Doubly Fed Machine

School of Electrical and Information Engineering, Tianjin University, No. 92 Weijin Road, Tianjin 300072, China
Author to whom correspondence should be addressed.
Received: 4 October 2017 / Revised: 18 December 2017 / Accepted: 20 December 2017 / Published: 1 January 2018
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In direct torque control (DTC) of the brushless doubly fed machine (BDFM) system, the inverter switching voltage vectors cannot always meet the control requirements, and the torque will lose control. For the losing control problem, this paper presents a solution of indirectly controlling torque by controlling the angle difference between the power motor (PM) stator flux and the control motor (CM) stator flux (called as the flux-angle-difference). Firstly, based on the CM static coordinate system BDFM model, the derivative equations of CM stator flux amplitude, the torque, and the flux-angle-difference are deduced. The losing control problem of BDFM’s DTC is studied by utilizing the CM stator flux amplitude and the torque derivatives. From the flux-angle-difference derivative, it is found that the phase angles of the flux-angle-difference derivative curves remain unchanged. Based on this property, by replacing the torque hysteresis comparator of conventional DTC with a flux-angle-difference hysteresis comparator, a modified control strategy called flux-angle-difference feedback control (FADFC) is proposed to solve the losing control problem. Finally, the validity and the good dynamic characteristic of the FADFC strategy are verified by simulation results. View Full-Text
Keywords: brushless doubly fed machine (BDFM); losing control problem; direct torque control (DTC); flux-angle-difference feedback control (FADFC) brushless doubly fed machine (BDFM); losing control problem; direct torque control (DTC); flux-angle-difference feedback control (FADFC)

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Xia, C.; Hou, X.; Chen, F. Flux-Angle-Difference Feedback Control for the Brushless Doubly Fed Machine. Energies 2018, 11, 71.

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