arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.02395math.OCcs.SYeess.SY
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无模型非线性反馈优化

Model-Free Nonlinear Feedback Optimization

Zhiyu He, Saverio Bolognani, Jianping He, Florian Dörfler, Xinping Guan

AI总结:

针对反馈优化需已知系统稳态灵敏度的难题,提出基于非凸目标评估梯度估计的无模型非线性反馈控制器,分析闭环最优性与稳定性,并引入Frank-Wolfe型更新处理多输入一般约束。

摘要:

反馈优化是一种使物理系统能够自主达到高效运行点的控制范式,其核心思想是将优化迭代与物理对象以闭环形式互连。由于基于梯度的迭代方法被广泛用于实现最优性,反馈优化控制器通常需要掌握对象的稳态灵敏度,而这一信息在某些应用中可能难以获取。相比之下,本文提出了一种无模型反馈控制器,用于实现一般动力系统的高效稳态运行。该设计的核心是通过在当前输入和测量输出处对非凸目标进行评估所构建的梯度估计,来更新控制输入。我们研究了所提出的迭代控制器与稳定非线性离散时间对象的动态互连情况。针对该设置,我们将闭环行为的最优性和稳定性表征为问题维度、迭代次数以及物理对象收敛速率的函数。为了处理影响多个输入的一般约束,我们采用Frank-Wolfe型更新对控制器进行了增强。

英文摘要:

Feedback optimization is a control paradigm that enables physical systems to autonomously reach efficient operating points. Its central idea is to interconnect optimization iterations in closed-loop with the physical plant. Since iterative gradient-based methods are extensively used to achieve optimality, feedback optimization controllers typically require the knowledge of the steady-state sensitivity of the plant, which may not be easily accessible in some applications. In contrast, in this paper, we develop a model-free feedback controller for efficient steady-state operation of general dynamical systems. The proposed design consists of updating control inputs via gradient estimates constructed from evaluations of the nonconvex objective at the current input and at the measured output. We study the dynamic interconnection of the proposed iterative controller with a stable nonlinear discrete-time plant. For this setup, we characterize the optimality and stability of the closed-loop behavior as functions of the problem dimension, the number of iterations, and the rate of convergence of the physical plant. To handle general constraints that affect multiple inputs, we enhance the controller with Frank-Wolfe-type updates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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