PH Nonlinear Process Control Method Based on Lyapunov Stability Theory

The process of pH is widely present in various fields such as chemical engineering, pharmaceuticals, and environmental protection. Different reactions and production processes have varying pH value requirements and precision levels. With the rapid development of technology, the demand for pH process control accuracy and effectiveness is increasing in all fields. This article proposes a control method based on the Lyapunov stability theory design, addressing the nonlinearity and disturbance complexity of the pH process. Starting from the control objective, this method designs the Lyapunov function for the linearized system to obtain the control rate expression. Simulation studies demonstrate that this control method has the advantages of fast response speed, disturbance rejection, and robustness. Moreover, compared to other model-based control methods, this method has a simpler structure and is easier to implement in practical industrial processes.