  With steadily increasing wind turbine penetration, regulatory standards for
grid interconnection are evolving to require that wind generation systems
ride-through disturbances such as faults and support the grid during such
events. Conventional modifications to the doubly fed induction generation
(DFIG) architecture for providing ride-through result in limited control of the
turbine shaft and grid current during fault events. A DFIG architecture in
which the grid side converter is connected in series as opposed to parallel
with the grid connection has shown improved low voltage ride through but poor
power processing capabilities. In this paper a unified DFIG wind turbine
architecture which employs a parallel grid side rectifier and series grid side
converter is presented. The combination of these two converters enables
unencumbered power processing and improved voltage disturbance ride through. A
dynamic model and control structure for this unified architecture is developed.
The operation of the system is illustrated using computer simulations.
