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Control of a Doubly Fed Induction Wind Generator Under Unbalanced Grid Voltage Conditions

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2 Author(s)
Brekken, T.K.A. ; Dept. of Electr. Eng. & Comput. Sci., Oregon State Univ., Corvallis, OR ; Mohan, N.

Wind energy is often installed in rural, remote areas characterized by weak, unbalanced power transmission grids. In induction wind generators, unbalanced three-phase stator voltages cause a number of problems, such as overcurrent, unbalanced currents, reactive power pulsations, and stress on the mechanical components from torque pulsations. Therefore, beyond a certain amount of unbalance, induction wind generators are switched out of the network. This can further weaken the grid. In doubly fed induction generators (DFIGs), control of the rotor currents allows for adjustable speed operation and reactive power control. This paper presents a DFIG control strategy that enhances the standard speed and reactive power control with controllers that can compensate for the problems caused by an unbalanced grid by balancing the stator currents and eliminating torque and reactive power pulsations

Published in:

Energy Conversion, IEEE Transactions on  (Volume:22 ,  Issue: 1 )

Date of Publication:

March 2007

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