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Model-based and Data-based Dynamic Output Feedback for Externally Positive Systems

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arxiv 2305.02472 v1 pith:57XRAX76 submitted 2023-05-04 eess.SY cs.SYmath.DS

Model-based and Data-based Dynamic Output Feedback for Externally Positive Systems

classification eess.SY cs.SYmath.DS
keywords controllersdynamicoutput-feedbackderiveexternallyoutputpositivesystems
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In this work, we derive dynamic output-feedback controllers that render the closed-loop system externally positive. We begin by expressing the class of discrete-time, linear, time-invariant systems and the class of dynamic controllers in the space of input-output behaviors, where a dynamic controller can be expressed as a static behavioral feedback gain. We leverage the static form of the controller to derive output-feedback controllers that achieve monotonic output tracking of a constant non-negative reference output. Further, we provide a direct data-driven approach to derive monotonic tracking output-feedback controllers for single-input-single-output (SISO) systems. Our approaches, model-based and data-based, allow us to obtain output-feedback controllers that render the closed-loop system externally positive. Finally, we validate our results numerically in a drone landing control problem.

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  1. Minimax adaptive control for finite sets of positive linear systems

    math.OC 2026-07 accept novelty 6.0

    Explicit minimax adaptive policies stabilize finite sets of positive LTI plants under adversarial disturbances with certified ℓ1-gain, via a history-variable Bellman inequality.