Title

Purely Analog Fractional Order PI Control Using Discrete Fractional Capacitors (Fractors): Synthesis and Experiments

Document Type

Conference Paper

Journal/Book Title/Conference

ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference

Publisher

The American Society of Mechanical Engineers

Location

San Diego, CA

Publication Date

9-1-2009

First Page

1307

Last Page

1314

DOI

10.1115/DETC2009-87490

Abstract

This paper presents the results of experiments related to analog fractional order PI control of a coupled tank system. A custom circuit board has been built to perform analog PID/FOPID control. Specialized circuit elements called ‘Fractors’ [1] are used to perform fractional order integration/differentiation of the error signals. The design of the board, subsequent experimentation and its comparison to similar digital control techniques have been presented. The benefits of purely analog control when dealing with non-linearities are also discussed. Further, methods of approximating a particular fractional order α* with any number of practically available orders α1 , α2 , ....αn has also been presented. The conclusion of this work examines the need for purely analog control as opposed to widespread digital methods and also lays down definite directions for future work.

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