Doubly fed induction generator wind farm fault ride-through capability

Abstract

Wind farms WF connected to the power network are frequently subjected to grid faults, a large rotor current rising proportion happens during grid voltage sags. These faults may cause damages to rotor windings, converters, DC Link capacitor or induce drive train mechanical stress due to torque fluctuations. This paper develops a crowbar and chopper protection strategy to care for doubly fed induction generator wind farm DFIGWF components. Some limiting circuits are added to the WF model to reduce undesirable fault effects. This control provides WF Fault Ride Through capability FRT to endure grid voltage dips avoiding WF grid-disconnection consigned in grid requirements. A simulation using PSCAD/EMTDC is started to instigate some grid faults and compare WF behavior with and without crowbar and chopper check to make assessment and confirm strategy benefic.