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 turbine systems. The primary advantage of SMC lies in its ability to handle system uncertainties and external disturbances, making it particularly suitable for DFIG applications where mechanical and electrical variations are common.

The core principle of SMC involves designing a sliding surface that ensures the system states converge to a desired trajectory despite external perturbations. In DFIG control, this often translates to regulating rotor-side and grid-side converters to maintain stable power output under varying wind speeds.

One of the key challenges in implementing SMC for DFIGs is chattering—a high-frequency oscillation phenomenon around the sliding surface. Various techniques, such as boundary layer approximation and higher-order sliding modes, are employed to mitigate this issue while preserving robustness.

Compared to traditional PI-based control methods, SMC offers superior dynamic response and disturbance rejection, making it a promising solution for modern wind energy systems. Future research directions may focus on hybrid control schemes combining SMC with intelligent algorithms like fuzzy logic or neural networks for further performance enhancement.