Title: Are Fractional PIDµ Controllers Good for All Processes?
Abstract: Fractional PI λ D μ controllers are considered as a promising alternative of PID controllers for future industrial applications.In comparison to classical PI and PID controllers, improved performance of fractional controllers for a number of applications has been reported.However, it is still unclear for which type of systems the more computationally-demanding fractional controllers would be significantly better as a replacement for integer PI and PID controllers.In this investigation, fractional controllers and classical PI and PID controllers have been tested for different benchmark systems to determine which classes of systems would benefit the most of using a more complex control algorithm.Results show that, despite the added degrees of freedom, it is not always beneficial to use such a computationally expensive controller and, only for some types of systems, fractional controllers will enhance controller performances.