Differential-algebraic equation;
Kalman-Yakubovich-Popov lemma;
Popov function;
Bounded real lemma;
Positive real lemma;
RICCATI EQUATION;
AUTOMATIC-CONTROL;
D O I:
10.1016/j.sysconle.2016.05.010
中图分类号:
TP [自动化技术、计算机技术];
学科分类号:
0812 ;
摘要:
The Kalman-Yakubovich-Popov lemma is a central result in systems and control theory which relates the positive semidefiniteness of a Popov function on the imaginary axis to the solvability of a linear matrix inequality. In this paper we prove sufficient conditions for the existence of a nonpositive solution of this inequality for differential-algebraic systems. Our conditions are given in terms of positivity of a modified Popov function in the right complex half-plane. Our results also apply to non-controllable systems. Consequences of our results are bounded real and positive real lemmas for differential-algebraic systems. (C) 2016 Published by Elsevier B.V.