Low voltage ride through enhancement of DFIG based WECS using flux control

Abstract

Doubly fed induction generator (DFIG) is found to be the most successful wind energy generator in last few decade. The direct coupling of stator makes the generating system affected by the disturbance. Previously generators were allowed to disconnect on the occurrence of a fault. However, disconnection makes the whole grid unstable. Grid code demands the generator to remain connected as well needs to satisfy the operating irregularity such as rotor current, stator current and dc-link voltage. The proposed scheme able to restricts these uncertainties and makes assure of converters, rotor circuit and dc-link capacitor protection. The proposed technique incorporates active control scheme using demagnetizing control and passive control scheme includes the series damping resistor (SDR). The simulation is carried out using MATLAB/Simulink based environment. The simulation results reveal the efficacy of the proposed scheme.