Fault current contribution of DFIG wind turbines

Abstract

Doubly fed induction generators (DFIGs) are widely used in modem high-power wind turbines. As a result of the anticipated increase in wind energy penetration, current grid code proposals require wind farms to have fault ride through capabilities to remain connected to the system. This paper presents a control solution where the DFIG voltage is controlled using both rotor- and grid-side converters through a coordinated control scheme. It is shown that by adopting this scheme the DFIG fault current contribution may be reduced enabling the generator to ride through faults with deep stator voltage sags.