2DOF-IMC for steam temperature process with fractional-order

摘要

Fractional-order calculus has been widely applied to many fields. For lots of thermodynamic systems, fractional-order description is more accurate than integer-order description. But the study of fractional-order system control shows that it is difficult to get suitable controller parameters. Aiming at the problem, this article applies two-degree-of-freedom internal model control (2D0F-IMC) to fractional-order systems based on internal model control. The designed controller separates reference input tracking performance from disturbance rejection characteristic. The algorithm only has two adjustable parameters and the physical meaning of parameters is explicit and intuitive which makes it easy to get suitable controller parameters. Numerical simulations show that remarkable improvement of regulatory capacity for both of reference input tracking and disturbance rejection are achieved simultaneously. The simulation examples show that the method is feasible and effective for fractional-order system.