This paper presents all possible combinations between three controllers (PI, PFC and FLC) in order to realise the cascade control strategy. The control strategy is applied on the level and flow apparatus. The control serves to maintain the liquid level in tank at desired value by manipulating the fluid into the reservoir. We have used the level and flow apparatus PUL-2/EV of Elettronica Veneta of Italian company, the LabJack U3 card acquisition and the laptop where we have developed a professional platform MATLAB Guide. In this work, we have shown the various experimental results: PI, PFC and fuzzy logic simple loop and the cascade control strategy for different combinations of controllers. We have also discussed the obtained results of the performance and rejection of disturbances for each combination under similar conditions, and, in conclusion, we have highlighted the importance of the combinations.

Keywords: Cascade control, Level and flow, Proportional-integral and derivative control (PID), Fuzzy logic control (FLC), Predictive functional control (PFC)