Distributed Asynchronous Discrete-Time Feedback Optimization

In this article, we present an algorithm that drives the outputs of a network of agents to jointly track the solution of a time-varying, strongly convex optimization problem. This algorithm is robust to asynchrony in the agents' operations, namely, first, computations of control inputs, second,...

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Published in:	IEEE transactions on automatic control Vol. 70; no. 6; pp. 3968 - 3983
Main Authors:	Behrendt, Gabriel, Longmire, Matthew, Bell, Zachary I., Hale, Matthew
Format:	Journal Article
Language:	English
Published:	New York IEEE 01.06.2025 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:	Algorithms Asymptotic properties Asynchronous optimization algorithms Computational modeling Convexity Current measurement Feedback Heuristic algorithms Load flow Machine learning algorithms multiagent systems Optimization Perturbation methods Robot sensing systems time-varying optimization Time-varying systems Vectors
ISSN:	0018-9286, 1558-2523
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Abstract	In this article, we present an algorithm that drives the outputs of a network of agents to jointly track the solution of a time-varying, strongly convex optimization problem. This algorithm is robust to asynchrony in the agents' operations, namely, first, computations of control inputs, second, linear measurements of network outputs, and third, communications of agents' inputs and outputs. We first show that our distributed asynchronous algorithm converges to the solution of a time-invariant feedback optimization problem in linear time. Next, we show that our algorithm tracks the solution of a time-varying feedback optimization problem within a bounded error dependent upon the movement of the minimizers and degree of asynchrony, which we make precise. These convergence results are extended to quantify agents' asymptotic behavior as the length of their time horizon approaches infinity. Then, to ensure satisfactory network performance we specify the timing of agents' operations relative to changes in the objective function that ensure a desired error bound. Numerical experiments verify these developments and show the utility of feedback optimization under asynchrony.
AbstractList	In this article, we present an algorithm that drives the outputs of a network of agents to jointly track the solution of a time-varying, strongly convex optimization problem. This algorithm is robust to asynchrony in the agents' operations, namely, first, computations of control inputs, second, linear measurements of network outputs, and third, communications of agents' inputs and outputs. We first show that our distributed asynchronous algorithm converges to the solution of a time-invariant feedback optimization problem in linear time. Next, we show that our algorithm tracks the solution of a time-varying feedback optimization problem within a bounded error dependent upon the movement of the minimizers and degree of asynchrony, which we make precise. These convergence results are extended to quantify agents' asymptotic behavior as the length of their time horizon approaches infinity. Then, to ensure satisfactory network performance we specify the timing of agents' operations relative to changes in the objective function that ensure a desired error bound. Numerical experiments verify these developments and show the utility of feedback optimization under asynchrony.
Author	Bell, Zachary I. Behrendt, Gabriel Hale, Matthew Longmire, Matthew
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SubjectTerms	Algorithms Asymptotic properties Asynchronous optimization algorithms Computational modeling Convexity Current measurement Feedback Heuristic algorithms Load flow Machine learning algorithms multiagent systems Optimization Perturbation methods Robot sensing systems time-varying optimization Time-varying systems Vectors
Title	Distributed Asynchronous Discrete-Time Feedback Optimization
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