FTC design based on projection approach applied to DFIG

This paper presents an efficient Fault Tolerant Control (FTC) strategy for the double-fed induction generator subject to faults using a projection- based approach. This research aims to construct an algorithm that can diagnose the presence of a fault in the closed loop system and switch itself between a nominal control (vector control) approach and a robust control (sliding mode control) designed for faulty conditions. The vector control can’t deal with the fault effect, which can achieve gradual system degradation, so we propose a sliding mode control when the faults occur to ensure a ripple-free operation. Moreover, the MRAS (model reference adaptive system) is used to analyse the dynamics of the residual vector (estimation error). This will serve as an indication of which control law should be used for such fault. The obtained results confirm that the suggested FTC has better robustness against the faults where the DFIG operates with acceptable performance in both active and reactive power.