Application Of Fractional Order Control Strategy In Double Volume Liquid Level System

Liquid level control systems are widely used in engineering applications to measure and regulate the liquid level in water tanks.The design and optimization of these systems hold significant practical and theoretical importance in enhancing production efficiency,safety,and sustainable development across industrial,civil,and agricultural sectors.This study focuses on the experimental investigation of the liquid level in a double-capacity water tank.By employing the fractional-order control strategy in the double-capacity liquid level system,the effectiveness of two fractional-order algorithms is examined on the experimental platform based on the process control system.The primary research objectives are outlined as follows:Firstly,addressing the issue of single control mode and limited scalability in the SPCT-II experimental equipment,a dual-capacity liquid level process control system experimental platform with enhanced flexibility and scalability is established and calibrated using the QStudio RP platform.The Wincon software is utilized to monitor and record real-time liquid level data in the water tank while adjusting the parameters.Secondly,the MATLAB system identification toolbox is employed to perform model identification of the platform’s liquid level system.This includes establishing the mathematical model of the system,conducting order reduction processing,and developing a fractional order integral module using the S function and M file.Finally,the fractional-order control strategy is implemented and validated on the experimental platform of the double-capacity liquid level control system presented in this study.Initially,the fractional-order PID control method is employed with parameter tuning using genetic algorithms,exhibiting superior control performance compared to traditional PID control.However,the parameter tuning process is more intricate.To optimize this process,a composite controller is formed by integrating the fractional-order filter with the internal model control method.This composite controller reduces the number of parameters requiring tuning and mitigates the difficulty of parameter adjustment.Through experimental comparison and verification,the algorithm demonstrates enhanced control efficacy.This research contributes an experimental verification platform and theoretical foundation for applying the fractional-order control strategy to dualcapacity liquid level systems.The findings hold reference value for the optimization and enhancement of liquid level control systems.