Design of high-performance tracking systems for multivariable plants with explicit actuator and sensor dynamics

Manganas, T

Abstract

The problems created by the presence of finite actuators and sensors in
the control of linear multivariable systems are well known. These
problems, which are particularly evident when high-gain or fast-sampling
control is used, are usually the cause of highly oscillatory or even
unstable closed-loop time-domain behaviour. Therefore, the presence of
finite actuators and sensors is probably one of the major factors
responsible for the failure of many of the existing multivariable.
control methods to deal with practical control problems, .especially in
the case of 'high-performance 1 systems - that require tight
non-interacting closed-loop tracking behaviour.
In this thesis, the very important field of high-gain and fast-sampling
control of linear multivariable systems with explicit actuators and
sensors is investigated. In particular, the synthesis of both high-gain
analogue and fast-sampling digital error-actuated
proportional-plus-integral controllers for linear minimum-phase
multivariable plants with explicit actuator and sensor dynamics is
presented. More importantly. the tuning of such controllers is
systematised to make explicit the choice of the controller tuning
parameters based on the gain/sampling frequency, the actuator and/or
sensor time-constants, and the required closed-loop time-domain
performance of the tracking systems.
Furthermore, it is shown that the controller design can be achieved
using only data obtained from direct input-output measurements in the
time-domain. In this way, the limitations imposed by the requirement
for the provision of linearised models in either state-space or transfer
function matrix form - a prerequisite of many current design
methodologies - for the purposes of controller design are eliminated
and, as a result, the scope of practical applicability of the developed
design methodology is vastly increased.
The various novel facets of this design methodology are illustrated
throughout this thesis by considering the multivariable model of a gas
turbine with explicit actuator and sensor dynamics. Thus, the
performance characteristics of the controllers for this gas turbine
designed by the -present methodology are compared with those of
controllers designed by previous methodologies.

Citation

Manganas, T. Design of high-performance tracking systems for multivariable plants with explicit actuator and sensor dynamics. (Thesis). Salford : University of Salford

• Thesis Type: Thesis
• Deposit Date: Oct 3, 2012
• Award Date: Jan 1, 1987