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Enhanced MPPT Control For DFIG-Based Wind Energy Systems Using Tunable Fractional-Order PI Controllers

Teklehaimanot Y K, Akingbade K F, Ubochi B C, Ale T O

Abstract

The global urgency to reduce reliance on depleting fossil fuels and mitigate climate change has intensified the pursuit of clean, renewable energy alternatives. Among these, wind energy emerges as a promising solution due to its scalability and suitability for integration into large power grids. Nevertheless, the variable nature of wind necessitates sophisticated control mechanisms to ensure consistent and reliable performance. This study introduces a Fractional- Order Proportional-Integral (FOPI) controller designed for Maximum Power Point Tracking (MPPT) in Doubly Fed Induction Generator (DFIG)-based Wind Energy Conversion Systems (WECS). By generalizing the traditional PI structure through the addition of a fractional order (µ), the proposed controller allows for enhanced flexibility and adaptability. The investigation centers on how different values of µ affect control effectiveness, focusing on metrics such as dynamic response, robustness, and precision. Simulation scenarios include both stepwise and random wind speed variations. Key system variables including active/reactive power outputs, rotor dynamics, electromagnetic torque, and current behavior are analyzed. Results obtained from MATLAB/Simulink simulations reveal that the FOPI controller achieves superior performance over the classical PI approach, particularly in terms of tracking precision, system stability, and response to disturbances, confirming its suitability for modern wind energy control applications.

Keywords

DFIG; FOPI; MPPT; Renewable energy; Wind Energy Conversion Systems.

References

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