The Optimal Steady-State Control Problem

The Optimal Steady-State Control Problem
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最优稳态控制问题

DOI:
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发表时间:
2019
期刊:
影响因子:
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通讯作者:
L. Lawrence
L. Lawrence
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作者:
L. Lawrence

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我们考虑的多变量非线性系统,调节系统状态和输入的任意子集的约束优化问题的解决方案的反馈控制器的设计问题,尽管参数建模的不确定性和随时间变化的外源干扰,我们称之为最优稳态(OSS)控制问题。我们推导出OSS控制器存在的充分必要条件,通过制定OSS控制问题作为一个输出调节问题,其中的调节误差是不可测量的。我们引入的最优模型的概念,并表明,存在的最优模型是足以减少OSS控制问题的输出调节问题与可测量的误差。这产生了一个OSS控制的设计框架,统一和扩展了文献中的许多现有设计。我们提出了一个完整的和建设性的解决方案的OSS控制问题的情况下,植物是线性时不变的结构参数的不确定性,和干扰是恒定的时间。我们说明了这些结果通过应用到电力网络的最优频率控制,并表明我们的设计过程中恢复几个频率控制器从最近的文献。
We consider the problem of designing a feedback controller for a multivariable nonlinear system that regulates an arbitrary subset of the system states and inputs to the solution of a constrained optimization problem, despite parametric modelling uncertainty and time-varying exogenous disturbances; we term this the optimal steady-state (OSS) control problem. We derive necessary and sufficient conditions for the existence of an OSS controller by formulating the OSS control problem as an output regulation problem wherein the regulation error is unmeasurable. We introduce the notion of an optimality model, and show that the existence of an optimality model is sufficient to reduce the OSS control problem to an output regulation problem with measurable error. This yields a design framework for OSS control that unifies and extends many existing designs in the literature. We present a complete and constructive solution of the OSS control problem for the case where the plant is linear time-invariant with structured parametric uncertainty, and disturbances are constant in time. We illustrate these results via an application to optimal frequency control of power networks, and show that our design procedure recovers several frequency controllers from the recent literature.
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