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On this paper a robust decentralized control system at cascade scheme applied to medium capacity wind systems is proposed. On the first closed-loop subsystem, the PMSG-side converter controller is designed for controlling the angular rotor velocity of a permanent magnet synchronous generator to maximize the wind energy capture. On the second closed-loop subsystem, the grid-side converter controller is designed for regulating the link DC-bus voltage located between two converters, and the reactive power to set a unity power factor. The two proposed controllers are based on a combination of the block control linearization technique and SOSM-super-twisting algorithm. Finally, simulation results of the wind systems are reported to validate the performance of the proposed controller having an oscillatory wind speed as input.
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