Effect of intermittent voltage source converter faults on the overall performance of wind energy conversion system
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The doubly fed induction generator (DFIG) is interfaced to the AC network through voltage source converters (VSCs) which are considered to be the core of the DFIG system. This paper investigates the impact of different intermittent VSC faults on the overall performance of a DFIG-based wind energy conversion system (WECS). The fault ride through capability of the DFIG under various VSC faults is also investigated. Faults such as open circuit and short circuit across the switches, when they occur within the grid side converter (GSC) and rotor side converter (RSC), are considered and compared in this paper. Short circuit and open circuit across the DC-link capacitor are also considered in this study as common VSC problems. Simulation results indicate that the short circuit faults have a severe impact on the overall performance of the DFIG, especially when they occur within the GSC. This is attributed to the fact that the GSC directly regulates the point of common coupling voltage. The open circuit faults have less impact on the performance of the DFIG-based WECS. A proper controller along with flexible AC transmission device should be available to compensate the required active and reactive power during these faults. A protection technique is necessary to detect these faults in advance to protect the VSC switches and the machine winding from any catastrophic failure.
This is an Author's Accepted Manuscript of an article published in the International Journal of Sustainable Energy, Volume 33, Issue 3, 2014, copyright Taylor & Francis, available online at: <a href="http://www.tandfonline.com/10.1080/14786451.2013.766190">http://www.tandfonline.com/10.1080/14786451.2013.766190</a>
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Yunus, A.; Abu-Siada, Ahmed; Masoum, Mohammad Sherkat (2012)The number of doubly fed induction generators (DFIG) connected to the existing network has increased significantly worldwide during the last two decades. This triggers off manufactures to improve the performance of DFIG ...
Abdou, A.; Abu-Siada, Ahmed; Pota, H. (2012)In doubly fed induction generator (DFIG) based wind energy conversion systems (WECS), the DFIG is interfaced to the AC network through grid side voltage source converter (GSC) and rotor side voltage source converter (RSC). ...
Abdou, A.; Abu-Siada, Ahmed; Pota, H (2013)The sensitivity of the doubly fed induction generator (DFIG) to external faults has motivated researchers to investigate the impact of various grid disturbances such as voltage sag and short circuit faults on the fault ...