Sliding mode control strategy for DFIG

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Sliding mode control strategy for DFIG

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Sliding mode control (SMC) is a robust control strategy widely applied to Doubly Fed Induction Generators (DFIG) in wind power systems. This technique offers excellent performance under variable operating conditions, making it particularly suitable for wind turbines exposed to unpredictable wind speeds and grid disturbances.

The core idea of sliding mode control for DFIG involves defining a sliding surface that represents the desired system dynamics. By forcing the system states to reach and stay on this surface, the controller achieves robustness against parameter variations and external disturbances.

Key benefits of applying SMC to DFIG include its inherent ability to handle nonlinearities in the generator dynamics and its strong rejection of grid-side disturbances. The controller maintains stable operation during voltage dips and maintains maximum power point tracking (MPPT) under changing wind conditions.

Implementation typically focuses on two main control loops: rotor-side converter control for torque regulation and grid-side converter control for DC-link voltage stabilization. The discontinuous nature of sliding mode control ensures fast response but requires careful design to minimize chattering effects in practical applications.

Advanced variations incorporate adaptive techniques to further improve performance under wide operating ranges, while hybrid approaches combine SMC with other control methods to balance robustness and steady-state precision. This makes sliding mode control particularly valuable for modern wind energy systems requiring both dynamic performance and grid code compliance.