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

TitleControl of a Doubly Fed Induction Wind Generator Under Unbalanced Grid Voltage Conditions
Publication TypeJournal Article
Year of Publication2007
AuthorsBrekken, T. K. A., and N. Mohan
JournalIEEE Transactions on Energy Conversion
Volume22
Issue1
Pagination129 - 135
Date Published03/2007
ISSN0885-8969
Keywordsasynchronous generators, electric current control, machine control, power generation control, power grids, reactive power control, rotors, stators, torque, wind power plants
Abstract

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

DOI10.1109/TEC.2006.889550
Short TitleIEEE Trans. On Energy Conversion