Fault ride-through capability enhancement of doubly-fed induction wind generators
Fault ride-through capability enhancement of doubly-fed induction wind generators
- Author(s): M. Mohseni ; S. Islam ; M.A.S. Masoum
- DOI: 10.1049/iet-rpg.2010.0154
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- Author(s): M. Mohseni 1 ; S. Islam 1 ; M.A.S. Masoum 1
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View affiliations
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Affiliations:
1: Department of Electrical and Computer Engineering, Curtin University of Technology, Perth, Australia
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Affiliations:
1: Department of Electrical and Computer Engineering, Curtin University of Technology, Perth, Australia
- Source:
Volume 5, Issue 5,
September 2011,
p.
368 – 376
DOI: 10.1049/iet-rpg.2010.0154 , Print ISSN 1752-1416, Online ISSN 1752-1424
Recent fault ride-through (FRT) requirements have proven problematic for variable-speed wind generation systems. A particular problem regarding to doubly-fed induction generators (DFIGs) is that standard proportional integral (PI) current controllers, designed with very limited control bandwidth, cannot eliminate rotor current oscillations that occur during a grid fault. As a consequence, the current in the rotor-side converter can exceed the safety limits of semiconductor switches, which potentially leads to converter failure. This study introduces a hybrid current controller to enhance the FRT capability of DFIGs through keeping the rotor current below the safety limits. The proposed current controller includes two switching strategies: the standard PI current controller for normal operating conditions and a vector-based hysteresis current controller (with very fast transient response) for overcurrent protection during grid faults. Simulation studies are carried out to demonstrate the effectiveness of the proposed hybrid current controller under various symmetrical and asymmetrical voltage sag conditions.
Inspec keywords: rotors; PI control; transient response; electric current control; power generation control; wind power; overcurrent protection; power supply quality; asynchronous generators
Other keywords:
Subjects: Wind power plants; Power supply quality and harmonics; Current control; Asynchronous machines; Control of electric power systems; Power system control; Power system protection
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