Using reset control for improvement of transient response

Abstract

PID is a widely used linear controller in industry field. However, PID is not sufficient enough to meet the increasing requirements because of the functional restrictions, like bode’s phase gain relation and waterbed effect. Nonlinear controllers are then interested by researchers. Reset control, as one of the nonlinear controllers, has more simple structure and easier to implement thus make more and more people pay attention to it. Integrator in PID creates high gain at low frequencies which gives benefits for reference tracking ability of the system so for high-tech industrial field more integrators are needed. The problem for more integrators in the system will introduce more phase loss at bandwidth which leads instability into the system. Reset control thus can help with dealing the problem by overcoming the limitation of linear controller. In current literature, frequency domain performance of using reset control is mainly focused. The performance in time domain should be also investigated. In this presentation, the method of designing the reset control to improve transient response with multiple integrators will be shown.