Control Strategy for the Rotor Side Converter of a DFIG-WT under Balanced Voltage Sag
Location: Brazil
Publication date: 2009-10-01
Published in: Brazilian Power Electronics Conference 2009, Bonito (Brazil) - COBEP 2009
ref. DOI: 10.1109/COBEP.2009.5347615

Local members

Alvaro Luna

PhD. Senior Researcher.

External members

Lima, K. , Watanabe, E.H.



This paper proposes a new control technique to improve the fault-ride through capability of doubly fed induction generators (DFIG). In such generators the appearance of severe voltagesags at the coupling point make rise to high over currents at the rotor/stator windings, something that makes necessary to protect the machine as well as the rotor side power converter. As a difference with the most extended solution, that reduces these currents by means of the connection of a crowbar circuit, this works intends to enhance the DFIGs response in such conditions without introducing extra hardware in the system. To this end, the proposed controlsystem feedback the stator currents as the rotor current reference during the fault, until they are driven to their nominal values. The feasibility of this proposal has been proven by means of mathematical and simulation models, based on PSCAD/EMTDC, as well as experimental results from a prototype of 6 kW rated power.