Designing a Cascade-Control Structure Using Fractional-Order Controllers: Time-Delay Fractional-Order Proportional-Derivative Controller and Fractional-Order Sliding-Mode Controller
Publication: Journal of Engineering Mechanics
Volume 143, Issue 7
Abstract
This paper considers a new cascade-control structure, which has an important difference from the other implemented cascade-control systems. Generally, the cascade-control structure consists of the inner and outer loops, and the slave and master controllers (i.e., controllers of the inner and outer loops, respectively). The novelty of this paper is that, for the first time, the master and slave controllers are both fractional-order (FO) controllers. The considered plant is a mechanical system with one degree of freedom. The slave controller is a time-delay fractional-order proportional-derivative (FOPD) controller; therefore, owing to delay in the slave controller and its FO structure, the inner closed-loop system turns into a time-delay FO system with the property of finite-time stability. For improving the transient response and also the robustness of the whole system, the fractional-order sliding-mode controller (FOSMC) law is designed as the master controller. The exact stability analysis is carried out for the proposed control structure. Finally, computer simulations show the good characteristics and performance of the proposed cascade-control structure.
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Published In
Journal of Engineering Mechanics
Volume 143 • Issue 7 • July 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Dec 19, 2015
Accepted: Nov 17, 2016
Published ahead of print: Feb 26, 2017
Published online: Feb 27, 2017
Published in print: Jul 1, 2017
Discussion open until: Jul 27, 2017
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