Anti-reset windup designs using LQG/H∞ and frequency domain methods

Many compensators and ad hoc design methods exist in the literature for the anti-reset windup problem of actuator saturation. However, they are seldom applicable over wide ranges of operating conditions and global stability of the compensated systems is not guaranteed. This paper presents one systematic design method in frequency domain with incorporated operating conditions. For stabilizable systems, global asymptotic stability can be guaranteed. Comparison with an elaborate LQG controller with H_∞ performance bounds demonstrates the practicality of the proposed method in aspects of simplicity, robustness, transient response, guaranteed domain of stability attraction and design efficiency