The recent publications in the field of control systems highlight a significant trend towards enhancing the robustness and efficiency of control strategies through innovative mathematical approaches and equivalence studies. A notable direction is the exploration of equivalence between advanced control methodologies and traditional PID control frameworks, aiming to simplify implementation without compromising performance. This is complemented by a growing interest in discrete-time control strategies that leverage higher-order integration schemes to extend the feasibility of sampling times, thereby improving system stability and performance under slower sampling rates. Additionally, there is a continued focus on addressing the set-point control problem in nonlinear systems, with an emphasis on expanding the region of attraction through novel control designs that incorporate model-following approaches and high-gain feedback mechanisms.

Noteworthy Papers

• Linear ADRC and PID Equivalence: Demonstrates that linear Active Disturbance-Rejection Control (ADRC) can be implemented using commonplace two degree-of-freedom PID controllers, offering a simplified approach to achieving ADRC's benefits.
• Discrete-Time Passivity-Based Control: Introduces a unifying derivation for arbitrary orders of integration schemes, enhancing the implementation of nonlinear state feedback control in sampled control loops.
• Set-point Control for Flat Nonlinear Systems: Presents a model-following control approach that significantly enlarges the region of attraction for nonlinear systems, compared to conventional high-gain designs.