Periodic Scenario Trees: A Novel Framework for Robust Periodic Invariance and Stabilization of Constrained Uncertain Linear Systems
Yehia Abdelsalam, Sankaranarayanan Subramanian, Sebastian Engell

TL;DR
This paper introduces a new framework using scenario trees to design robust periodic controllers for constrained uncertain linear systems, ensuring stability and invariance with less conservatism.
Contribution
It presents a novel scenario tree-based approach for synthesizing robust periodic controllers and invariant sets, with convex feasibility criteria and proven non-conservativeness.
Findings
Convex criteria for static and interpolating controllers
Existence of stabilizing controllers for large periods
Less conservative invariant set conditions
Abstract
This work proposes a new a framework for determining robust periodic invariant sets and their associated control laws for constrained uncertain linear systems. Necessary and sufficient conditions for stabilizability by periodic controllers are stated and proven using finite step Lyapunov functions for the unconstrained case. We then introduce a scenario tree interpretation of finite step Lyapunov functions for uncertain systems and show that this interpretation results in useful criteria for the design of robust stabilizing controllers. In particular, novel convex feasibility criteria for the synthesis of simple static controllers and what we call linear interpolating tree periodic controllers with memory are derived. It is proven that for a sufficiently large length of the period, a stabilizing linear interpolating tree periodic controller can always be found using the proposed…
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Taxonomy
TopicsFormal Methods in Verification · Modeling and Simulation Systems · Advanced Control Systems Optimization
