Control of a Variable-Impedance Fault Current Limiter to Assist Low-Voltage Ride-Through of Doubly Fed Induction Generators

A fault current limiter (FCL) may be applied to assist the low-voltage ride-through (LVRT) of a doubly fed induction generator (DFIG). FCLs with fixed impedance, lack flexibility adjust their impedance adapt different LVRT scenarios. The direct switch-in and -out fixed-impedance FCL yields transient electromagnetic oscillations in DFIG, which need addressed. In this paper, variable-impedance is implemented at stator side DFIG its LVRT, novel methodology proposed control FCL, oscillation effectively constrained smooth switch-out realized avoid continued active power consumption restore pre-fault working condition. Analysis carried out, lays foundation for determine based on calculation optimization goal. feasibility effectiveness are verified by numerical analysis results, compare simulation results application FCLs.