RelaxC controller and PID for time delay systems: Experimental test results on Boiler pilot plant

Abstract

In this paper a novel method of RelaxC controller design is introduced for time delay systems, offering significant implications for process industry. RelaxC’s new technology involves the use of two significant concepts: generating functions and reactivity time. The designed RelaxC controller is applied to First Order Plus Dead Time (FOPDT), Second Order Plus Dead Time (SOPDT), second order integrating, multivariable and nonlinear systems using MATLAB simulations. The key parameters of RelaxC are set, by the designer’s expertise. Proportional Integral Derivative (PID) control is utilized to compare results in particular cases. This method addresses inherent limitations of traditional PID. The RelaxC controller effectively mitigates the adverse effects of time delays, providing more precise setpoint tracking, enhanced disturbance rejection and reduced control effort. The findings emphasize potential of adopting the RelaxC controller for many industrial applications. The experimental results of a real-time boiler pilot plant for temperature and drum level control are presented to demonstrate the efficacy of the proposed method.

Keywords

• RelaxC
• PID
• Generating function
• Boiler pilot plant