Synthesis of fractional order robust controller based on Bode's ideas

Area of Science:

• Control Systems Engineering
• Electrical Engineering
• Mechatronics

Background:

• Basic Bode's ideal transfer function (BITF) controllers struggle with disturbance rejection for plants featuring cascaded integrators.
• Enhancing disturbance rejection is crucial for robust control system performance.

Purpose of the Study:

• To propose an improved BITF-based control method for superior disturbance rejection in specific control systems.
• To enhance the open-loop magnitude characteristics for better low and high-frequency performance.

Main Methods:

• Integration of a fractional order proportional-integral controller and a Bode's ideal cut-off filter into the BITF strategy.
• Application to the speed control of permanent magnet synchronous motor (PMSM) servo systems.
• Verification through simulations and experimental studies, including performance comparisons.

Main Results:

• The improved BITF controller significantly enhances disturbance rejection performance.
• Robustness and dynamic response of the PMSM servo system are improved.
• The proposed method outperforms existing control strategies in simulations and experiments.

Conclusions:

• The enhanced BITF controller effectively improves disturbance rejection and robustness for PMSM servo systems.
• The method offers a better trade-off between performance and stability compared to existing approaches.
• This approach provides a viable solution for enhancing control system performance in demanding applications.