PI Control Applied to a Small-Scale Thermal System with Heating and Cooling Sources

The present work introduces the methodology used to control a temperature plant’s MISO (Multiple Input, Single Output) systems by applying the control in the heating and cooling sources. For this purpose, a survey of the reaction curve for each source was carried out, identification of the respective first-order transfer functions approximate to the system, tuning the PI controllers, implementing anti-windup filters for integral action, and discretization of the controllers. In the end, the results were compared using continuous and discrete PI forms. Finally, both proved good results, and the two controllers’ combinations achieved the desired performance.