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arXiv 2201.12816eess.SYcs.SY
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基于神经网络的不确定非线性过程自适应收缩控制

Adaptive Contraction-based Control of Uncertain Nonlinear Processes using Neural Networks

Lai Wei, Ryan McCloy, Jie Bao

摘要:

在过程控制行业柔性制造趋势和化工过程模型不确定性的驱动下,本文旨在实现一类不确定非线性系统(例如,使用具有参数不确定性的过程模型)。所提出的自适应控制方法将自适应神经网络嵌入基于收缩的控制器(以确保收敛到时变参考)和与参考生成耦合的在线参数识别模块(以确保建模参数收敛于物理系统的参数)纳入控制回路。集成的学习和控制方法包括训练状态和参数相关的神经网络学习由不确定参数和微分反馈增益参数化的收缩度量。然后将该神经网络嵌入到基于自适应收缩的控制律中,该控制律通过在线参数估计进行更新。由于不确定参数估计收敛到相应的物理值,无偏移跟踪,同时提高收敛速度,可以实现,从而导致一个灵活的,有效的和保守性较小的方法,参考跟踪控制的不确定非线性过程。包括一个说明性的例子来演示的整体方法。包括一个说明性的例子来演示的整体方法。

英文摘要:

Driven by the flexible manufacturing trend in the process control industry and the uncertain nature of chemical process models, this article aims to achieve offset-free tracking for a family of uncertain nonlinear systems (e.g., using process models with parametric uncertainties) with adaptable performance. The proposed adaptive control approach incorporates into the control loop an adaptive neural network embedded contraction-based controller (to ensure convergence to time-varying references) and an online parameter identification module coupled with reference generation (to ensure modelled parameters converge those of the physical system). The integrated learning and control approach involves training a state and parameter dependent neural network to learn a contraction metric parameterized by the uncertain parameter and a differential feedback gain. This neural network is then embedded in an adaptive contraction-based control law which is updated by parameter estimates online. As uncertain parameter estimates converge to the corresponding physical values, offset-free tracking, simultaneously with improved convergence rates, can be achieved, resulting in a flexible, efficient and less conservative approach to the reference tracking control of uncertain nonlinear processes. An illustrative example is included to demonstrate the overall approach. An illustrative example is included to demonstrate the overall approach.

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