One of the major problems in wind power parks which uses Doubly-Fed Induction Generators (DFIGs) is that the generator rotor windings are connected to the grid via back-to-back convertors that control the rotor current and inject it into the grid.
The system is sensitive to grid disturbances, leading to large induced voltages in the rotor windings at rotational frequency for this type of circuit achitecture.
The solution is an enhanced Fault RideThrough (FRT) capability for Doubly Fed Induction Generator (DFIG) based wind turbines. This is realized by a new FRT configuration coupled with a transient management scheme.
The key elements of the FRT configuration introduces shunt and series compensation for normal operation and voltage dips and a breaking resistor to smooth switching transients from shunt to series interfaces.
The combination of shunt and series interfaces reduces the overall component count of the circuit: a simple design and an improved preformance.