This paper proposes an adaptable sliding mode control (A-SMC) scheme for an autonomous induction generator working with variable speed and load. The three-phase induction generator (IG) is excited using a PWM inverter connected to a single capacitor on the dc side. It is modelled through a diphase approach based on the application of the Park transform. The magnetic saturation phenomenon is included in the IG model. The control strategy should keep the dc voltage across the capacitor constant and equal to the reference value. The control takes a cascaded configuration, four SMCs in all. The outer control loops use adaptable gains and a tangent hyperbolic function, to ensure better performances in terms of response time, chattering and robustness. Finally, simulation results show the effectiveness of the proposed control strategy.

Keywords: Vector control, Sliding mode control, Chattering, Adaptable gains, Autonomous induction generator, Magnetic saturation