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 nonlinear control strategy widely applied to doubly-fed induction generators (DFIGs) in wind turbine systems. It offers excellent disturbance rejection and parameter insensitivity, making it particularly suitable for the variable-speed operation of DFIGs under uncertain grid conditions.

The core principle involves designing a sliding surface that ensures the system state converges to a desired trajectory despite external disturbances. Once the system reaches this sliding surface, it remains invariant to parameter variations and external perturbations. For DFIG control, SMC is often applied to regulate rotor-side and grid-side converters to maintain stable active/reactive power output and DC-link voltage.

A key advantage is its inherent robustness against mechanical torque fluctuations, grid voltage dips, and parameter uncertainties—common challenges in wind power systems. However, chattering (high-frequency oscillations) remains a practical concern, often mitigated through boundary layer techniques or higher-order sliding mode approaches.

Modern implementations frequently combine SMC with other strategies like field-oriented control or fuzzy logic to further enhance dynamic response while minimizing switching losses. Recent research also explores adaptive sliding mode variants to reduce conservatism in controller design.