Detailed study of DFIG-based wind turbines to overcome the most severe grid faults
Scholar | Other documents of the author: Rolán Blanco, Alejandro; Pedra Durán, Joaquín; Córcoles López, Felipe
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TitleDetailed study of DFIG-based wind turbines to overcome the most severe grid faults
This paper studies the effects of voltage sags caused by faults on doubly-fed induction generators to overcome grid faults. A wide range of sag duration and depth values is considered. It is observed that sag duration ... [+]
This paper studies the effects of voltage sags caused by faults on doubly-fed induction generators to overcome grid faults. A wide range of sag duration and depth values is considered. It is observed that sag duration influence is periodical. Sag effects depend on duration and depth and on the fault-clearing process as well. Two approaches of the model are compared: the most accurate approach, discrete sag, considers that the fault is cleared in the successive natural fault-current zeros of affected phases, leading to a voltage recovery in several steps; the least accurate approach, abrupt sag, considers that the fault is cleared instantaneously in all affected phases, leading to a one-step voltage recovery. Comparison between both sag models reveals that the fault-clearing process smoothes sag effects. The study assumes that the rotor-side converter can keep constant the transformed rotor current in the synchronous reference frame, thus providing insights into wind turbine fault ride-through capability. The voltage limit of the rotor-side converter is considered to show the situations where the rotor current can be controlled. Finally, a table and a 3D figure summarizing the effects of the most severe grid faults on the rotor-side converter to overcome the most severe faults are provided. [-]
Bibliographic citationROLÁN, Alejandro; PEDRA, Joaquín; CÓRCOLES, Felipe. Detailed study of DFIG-based wind turbines to overcome the most severe grid faults. International Journal of Electrical Power & Energy Systems, 2014, vol. 62, p. 868-878.
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