Anti wind-up techniques applied to real tank level system performed by PI controllers

PI controller is still the most used control algorithm in industry. This can be explained by its robustness and easy implementation. However, the presence of overshoot (inherent characteristic of the integral action) could prejudice its use. Considering the presence of such an effect, the main objective of this paper is to present the outcome of seven principal methodologies to compensate the integral action through a real level tank system. The results obtained showed the extreme necessity to compensate the integral action when using PI controller. For control loop audit, non-intrusive performance indexes were used, like IAE, ITAE, ISE and ITSE.