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YU Yang,HOU Xiaoxin.Low-voltage Ride-through Analysis of Brushless Doubly-fed Machine Under Grid Symmetrical Fault[J].JOURNAL OF POWER SUPPLY,2018,16(2):151-158
Low-voltage Ride-through Analysis of Brushless Doubly-fed Machine Under Grid Symmetrical Fault
Received:May 23, 2016  Revised:December 27, 2016
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DOI:10.13234/j.issn.2095-2805.2018.2.151
Keywords:brushless doubly-fed machine(BDFM)  feedback linearization  low-voltage ride-through(LVRT) mode
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YU Yang School of Electrical and Information Engineering, Tianjin University, Tianjin , China yu_yang1225@tju.edu.cn
HOU Xiaoxin School of Electrical and Information Engineering, Tianjin University, Tianjin , China
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Abstract:
      In this paper, an affine nonlinear state model is obtained by controlling the rotor field orientation in a synchronous reference frame. Feedback linearization decoupling control method is implemented on the controller of a brushless doubly-fed machine(BDFM). During a three-phase symmetrical grid voltage dip, the transient responses of the control machine's stator current and stator counter-electromotive potential are analyzed. According to the expressions, it is shown that when BDFM is operating stably, there is a linear proportional relationship between the control machine's rotor flux linkage and the power machine's stator voltage; moreover, a low-voltage ride-though mode is presented to improve the control performance and stability of the system, and guarantee the capability of LVRT of machines. Simulation results validate the accuracy and effectiveness of the theoretical analysis.
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