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Stability of interconnected impulsive systems with and without time-delays using Lyapunov methods
In this paper we consider input-to-state stability (ISS) of impulsive control
systems with and without time-delays. We prove that if the time-delay system
possesses an exponential Lyapunov-Razumikhin function or an exponential
Lyapunov-Krasovskii functional, then the system is uniformly ISS provided that
the average dwell-time condition is satisfied. Then, we consider large-scale
networks of impulsive systems with and without time-delays and we prove that
the whole network is uniformly ISS under a small-gain and a dwell-time
condition. Moreover, these theorems provide us with tools to construct a
Lyapunov function (for time-delay systems - a Lyapunov-Krasovskii functional or
a Lyapunov-Razumikhin function) and the corresponding gains of the whole
system, using the Lyapunov functions of the subsystems and the internal gains,
which are linear and satisfy the small-gain condition. We illustrate the
application of the main results on examples
On Incremental Stability of Interconnected Switched Systems
In this letter, the incremental stability of interconnected systems is
discussed. In particular, we consider an interconnection of switched nonlinear
systems. The incremental stability of the switched interconnected system is a
stronger property as compared to conventional stability. Guaranteeing such a
notion of stability for an overall interconnected nonlinear system is
challenging, even if individual subsystems are incrementally stable. Here,
preserving incremental stability for the interconnection is ensured with a set
of sufficient conditions. Contraction theory is used as a tool to achieve
incremental convergence. For the feedback interconnection, the small gain
characterisation is presented for the overall system's incremental stability.
The results are derived for a special case of feedback, i.e., cascade
interconnection. Matrix-measure-based conditions are presented, which are
computationally tractable. Two numerical examples are demonstrated and
supported with simulation results to verify the theoretical claims
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