1) The document discusses using a Dynamic Voltage Restorer (DVR) to improve the fault ride-through capability of a Doubly Fed Induction Generator (DFIG) used in wind turbines.
2) A DFIG relies on back-to-back voltage source converters which make it susceptible to faults that cause voltage dips. This can cause the DFIG to lose synchronization and trip off the grid.
3) A DVR monitors the grid voltage and injects the missing voltage during faults to maintain the load voltage. This allows the DFIG to continue operating through faults as required by grid codes.
4) Simulation results are presented for a 2MW DFIG wind turbine model connected to the