Static output feedback stabilization for uncertain discrete-time singular systems
Jiawei Shen
1
, Jinxing Lin
1
1. Nanjing University of Posts and Telecommunications, Nanjing 210023
E-mail: shjw36@163.com
E-mail: jxlin2004@126.com
Abstract: The problem of static output feedback control for uncertain discrete singular systems is discussed in this paper. One new
necessary and sufficient condition for the uncertain discrete singular systems to be regular, causal and stable is proposed in terms of
linear matrix inequality (LMI) approach. Sufficient conditions are proposed for the existence of static output feedback controller in
terms of strict LMIs. A numerical example is provided to demonstrate the effectiveness of the proposed approaches.
Key Words: Discrete Singular Systems, Static Output Feedback, LMI, Slack Variables, Uncertainty
1 Introduction
Singular systems, which
are also known as descriptor
systems or implicit systems have attracted great interests
in the literature for their different applications such as
electrical, economy systems, robotics, and chemical
processes. In the past few decades, singular system
analysis and controller design have got considerable
attention of many people. Because of its general
description, such a model is used to design the controller
and observer in the different fields of research [1]. Many
notions and results developed for the state-space systems
in the past years [2]. A new robust stability condition for
uncertain discrete-time systems is discussed in [3]. In [4],
stabilization and
f
H
control of singular systems have
been proposed with matrix inequalities approaches. In [5],
f
H
state feedback control for discrete singular systems
using a non-strict LMI was derived but it has the
disadvantage that it cannot be solved easily. In [6-8]
uncertain linear discrete singular systems are studied. A
sufficient LMI condition is given in [8] which is more
tractable. Furthermore, Zhang [9] proposed a strict LMI
condition for
f
H
control problem thus its more tractable
and numerically reliable. But it is hard to
design
f
H
controllers or observers. In [10-12] new
necessary and sufficient conditions for robust
admissibility of discrete singular systems are proposed in
strict linear matrix inequalities. The results are extended
to uncertain singular systems in [11]. In [13] the
This work was supported by the National Natural ScienceFoundation
ofChina under Grant 61473158, and the Natural Science Foundation of
JiangsuProvince under Grant BK20141430.
stochastic stability and stochastic stabilization for
time-varying delay discrete-time singular Markov jump
systems are discussed. For discrete singular hybrid
systems, the stochastic stabilization problem was studied
in [14], where the sufficient conditions for state feedback
stabilization and static output feedback stabilization were
obtained. In [15], static output feedback control laws of
the uncertain discrete-time switched linear singular
systems are derived. The results of static output feedback
stabilization problem for discrete singular systems with
Markovian jump can be found in [16]. In [17-18]
extended LMI characterizations for stability and
performance of linear systems are derived by introducing
slack variables, which are very important in this paper.
The slack variables approach has the advantage of not
involve products of the Lyapunov matrix and the system’s
state-space matrices.
In this paper, we discussed the static output feedback
stabilization for uncertain discrete singular systems. One
new necessary and sufficient condition is derived
ensuring the regularity, causality and stability of the
uncertain discrete singular systems. We use the projection
lemma to derive our main theorem, it is easy to obtain the
result which is shown in the proof. The sufficient
conditions for the existence of the static output feedback
controller is then easy derived. An illustrative numerical
example is given to show the effectiveness of the
proposed approach.
Notations:
n
R
and
nm
R
u
denote the
n
dimensional
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