Abstract
This paper presents a super-twisting sliding mode direct control (SSM-DC) strategy brushless doubly fed induction generator (BDFIG) for variable speed constant frequency wind energy conversion system. The proposed SSM-DC strategy employs a resonant based super-twisting sliding mode control scheme to directly control the required control winding stator voltage so as to eliminate the power winding stator flux instantaneous errors, without synchronous rotating coordinate transformation involving. The stability, robustness and convergence capability of the proposed control strategy were described and analyzed. Thank to no extra inner control loops involved, thus enhancing the transient performance. Constant converter switching frequency was achieved by using space vector modulation, which reduce the voltage harmonic of generator terminal. In addition, the feasibility and validity of the proposed scheme is prove by simulation results, then, enhanced transient performance and steady-state harmonic spectra is achieved.
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