Predictive active disturbance rejection control for processes with time delay.

Area of Science:

• Control Engineering
• Systems Science

Background:

• Active Disturbance Rejection Control (ADRC) effectively manages system uncertainties and disturbances.
• Standard ADRC methods face limitations with systems exhibiting large transport delays.

Purpose of the Study:

• To address the limitations of ADRC in systems with significant transport delays.
• To enhance transient response and stability characteristics of ADRC for delayed systems.

Main Methods:

• Modification of the extended state observer (ESO) within ADRC to create a predictive ADRC.
• Utilizing approximate knowledge of plant delay and model for the proposed method.

Main Results:

• The predictive ADRC demonstrates significant improvements in transient response and stability.
• Comparative analysis shows superior performance and robustness over existing methods like dead-time compensators and Filtered Smith Predictors.
• Validation through extensive simulations, hardware-in-the-loop tests, and frequency response analysis.

Conclusions:

• The proposed predictive ADRC offers a robust solution for controlling systems with large transport delays.
• This approach provides substantial performance gains compared to conventional control strategies for challenging industrial applications such as chemical reactors and boilers.