A new anti-windup proportional integral controller design with TRIZ

With the advance in technology, control and automation has evolved rapidly to suit the industrial needs. Despite many modern control embedded with artificial intelligence, the Proportional-Integral (PI) control still the common controller due to its simple structure. However, PI controller experiences windup issue which causes overshoot in the response. Many anti-windup PI controllers were introduced to improve the performance. Their algorithm switches between a modified integral control and the common integral operation in a PI controller. Switching may induce instability in the control system. Similar to PI controller, these anti-windup PI controllers will exhibit the coupling of tuning gains and suffer degradation in performance. Utilising the theory of inventive problem solving technique, TRIZ, an innovative solution was designed to address this challenge. Through a systematic modelling and analysis, the root cause was found by cause and effect analysis and idea generated has introduced the new antiwindup PI controller without switching by using suggested inventive principles. With the tuning gains being decoupled, the new controller shows an improved performance with minimal to no overshoot and short rise time as compared to the conventional PI controller.