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07 February 2025
 
  » arxiv » 1609.0056

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Team Optimal Decentralized Control of System with Partially Exchangeable Agents--Part 1: Linear Quadratic Mean-Field Teams
Jalal Arabneydi ; Aditya Mahajan ;
Date 1 Sep 2016
AbstractWe consider team optimal control of decentralized systems with linear dynamics and quadratic costs that consist of multiple sub-populations with exchangeable agents (i.e., exchanging two agents within the same sub-population does not affect the dynamics or the cost). Such a system is equivalent to one where the dynamics and costs are coupled across agents through the mean-field (or empirical mean) of the states and actions. Two information structures are investigated. In the first, all agents observe their local state and the mean-field of all sub-populations; in the second, all agents observe their local state but the mean- field of only a subset of the sub-populations. Both information structures are non-classical and not partially nested. Nonetheless, it is shown that linear control strategies are optimal for the first and approximately optimal for the second; the approximation error is inversely proportional to the size of the sub-populations whose mean-fields are not observed. The corresponding gains are determined by the solution of K+1 Riccati equations, where K is the number of sub-populations. The dimensions of the Riccati equations do not depend on the size of the sub-populations; thus the solution complexity is independent of the number of agents. Generalizations to major-minor agents, tracking cost, weighted mean-field, and infinite horizon are provided. The results are illustrated using an example of demand response in smart grids.
Source arXiv, 1609.0056
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