LOW-VOLTAGE RIDE-THROUGH CAPABILITY FOR DFIG WIND TURBINE SYSTEM USING CROWBAR AND BRAKING CHOPPER

Abstract

This paper proposes a low-voltage ride-through (LVRT) capability for a doubly-fed induction generator (DFIG) wind turbine (WT) system. With the proposed method, a crowbar connected at the rotor-side of the DFIG and a braking chopper (BC) connected in paralell with DC-link capacitor of back-to-back converters have been applied. By this, the crowbar enables to well improve responses of system during the grid faults. Also, to protect the DC capacitor from its overvoltage, a braking chopper has been employed. The simulation for 2 MW-DFIG wind turbine system during the grid faults using PSCAD software has been performed to verify the effectiveness of the proposed method.