DESIGN, ANALYSIS AND EXPERIMENTAL VERIFICATION OF A NOVEL NONLINEAR PI CONTROLLER

Year 2017, Volume: 18 Issue: 4, 876 - 896, 31.10.2017

Ali Fuat Ergenc , Handan Nak , Şirin Akkaya

https://doi.org/10.18038/aubtda.340651

Cited By: 3

Abstract

In this study, a novel variable gain PI controller
structure is introduced. The proposed controller structure consists of a
sector-bounded nonlinear function of the relative error value in cascade with a
linear fixed-gain PI controller. The stability analysis of the closed loop
system is examined through Popov stability criterion, Routh-Hurwitz stability
method and stability boundary locus method for both second-order and higher-order
systems. In addition, the performance of the controller against parameter
variations and disturbances is investigated through some simulations for second
order systems.  An experimental study, an
active suspension system, is conducted to examine the performance of the
controller for higher order systems. In the literature, there are
similar controllers, but the proposed one is superb in terms of effectiveness
and stability. The new controller prevents the saturation of the controller
signal. Simulation results and experimental studies reveal that proposed
controller structure is quite effective for both lower and higher order
systems.

Keywords

: Nonlinear PI, Variable gain, Popov criterion, stability boundary locus, Active suspension

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