This paper proposes a novel approach to stability analysis of discrete-time nonlinear periodically time-varying systems. The contributions are as follows. Firstly, a relaxation of standard Lyapunov conditions is derived. This leads to a less conservative Lyapunov function that is required to decrease at every period rather than at each time instant. Secondly, for linear periodic systems with constraints, we show that compared to standard Lyapunov theory, the novel stability concept yields a larger estimate of the region of attraction. An example illustrates the effectiveness of the developed theory.
|Title of host publication||Proceedings of the IFAC Workshop on Periodic Control Systems, August 26-28, 2010, Antalya, Turkey|
|Place of Publication||Oxford|
|Publication status||Published - 2010|