Asian Journal of Control, Vol. 11, No. 4, pp. 457 460, July 2009
Published online 5 June 2009 in Wiley InterScience (www.interscience.wiley.com) DOI: 10.1002/asjc.126
–Brief Paper–
OUTPUT FEEDBACK STABILIZATION FOR DELAYED LARGE-SCALE
STOCHASTIC SYSTEMS WITH MARKOVIAN
JUMPING PARAMETERS
Baoyong Zhang, Shengyuan Xu and Yun Zou
ABSTRACT
This paper deals with the problem of decentralized output feedback sta-
bilization for a class of large-scale stochastic time-delay systems with Marko-
vian jumping parameters. Attention is focused on the design of a decentralized
dynamic output feedback controller, which is also with Markovian jumping
parameters, such that the closed-loop system is exponentially mean-square
stable. A sufficient condition for the solvability of this problem is proposed
in terms of linear matrix inequalities.
Key Words: Large-scale systems, output feedback stabilization, stochastic
systems, time delays.
I. INTRODUCTION
It is well known that lots of real world systems,
such as power systems, digital communication net-
works, economic systems and urban traffic networks,
can be modeled as large-scale systems. Therefore, the
study of large-scale systems is of much practical im-
portance. Recently, the decentralized control problem
for large-scale systems has received much attention.
Via different approaches, the problems of decentralized
stabilization and H
∞
controller design for large-scale
systems were solved in [1, 2], respectively. When time
Manuscript received November 26, 2007; revised May 22,
2008; accepted January 3, 2009.
The authors are with the School of Automation, Nanjing Uni-
versity of Science and Technology, Nanjing 210094, P.R. China
(e-mail: syxu02@yahoo.com.cn).
This work was supported in part by the National Sci-
ence Foundation for Distinguished Young Scholars of P.R.
China under Grant 60625303, the Specialized Research Fund
for the Doctoral Program of Higher Education under Grant
20060288021, the National Natural Science Foundation of P.R.
China under Grant 60850005, the Natural Science Foundation
of Jiangsu Province under Grant BK2008047, and the Research
Innovation Program for Graduate Students in Jiangsu Province
under Grant CX07B
114z.
delays appear in a large-scale system, results can be
found in [3] for stability analysis, in [4] for decentral-
ized stabilization and in [5] for decentralized guaran-
teed cost controller design.
Very recently, the decentralized stabilization prob-
lem for large-scale stochastic systems has been studied
[6–8].In[6], a decentralized adaptive output feedback
controller was constructively designed by the backstep-
ping method. In [8], a Lyapunov-based recursive design
approach was developed for the designs of decentral-
ized state feedback and output feedback controllers for
a class of large-scale stochastic nonlinear systems. It
should be pointed out that time delays are not considered
in [6, 8]. For large-scale stochastic systems with time
delays, the decentralized stabilization problem was in-
vestigated in [7], where state feedback controllers were
designed such that the resulting closed-loop intercon-
nected stochastic system is globally asymptotically sta-
ble in probability.
Motivated by the previous works related to
stochastic systems and large-scale systems, in this
paper we consider the decentralized output feedback
stabilization problem for a class of large-scale stochas-
tic time-delay systems with Markovian jumping param-
eters. A sufficient condition for the solvability of this
problem is presented in terms of LMIs. It is shown that
a desired output feedback controller can be constructed
q
2009 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society