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arXiv 2010.07239eess.SYcs.SY
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基于Koopman Lyapunov模型预测控制的无偏置控制框架处理对象模型失配

Handling plant-model mismatch in Koopman Lyapunov-based model predictive control via offset-free control framework

Sang Hwan Son, Abhinav Narasingam, Joseph Sang-Il Kwon

摘要:

Koopman算子理论通过将非线性动力学变换到更高维的可观测函数空间来实现给定非线性动力系统的全局线性表示,其中可观测函数的演化由无限维线性算子支配。对于Koopman算子理论的实际应用,已经开发了各种数据驱动的方法来通过近似Koopman算子来导出提升的状态空间模型。基于近似模型的Koopman模型预测控制(KMPC)方案已经被提出。然而,由于无限维Koopman算子的有限维近似不能完全表示非线性动力系统,因此在这些KMPC方案中固有地存在对象模型失配,并且对控制系统的性能产生负面影响。在这项工作中,我们提出了无偏Koopman李雅普诺夫为基础的模型预测控制(KLMPC)框架,解决了固有的植物模型失配KMPC计划使用无偏控制框架的基础上的干扰估计方法,并确保可行性和稳定性的控制系统通过应用李雅普诺夫约束的最优控制问题。零稳态偏移条件的开发框架进行了数学研究。所开发的框架的有效性也证明了通过比较建议的无偏置KLMPC和标称KLMPC的闭环结果。

英文摘要:

Koopman operator theory enables a global linear representation of a given nonlinear dynamical system by transforming the nonlinear dynamics into a higher dimensional observable function space where the evolution of observable functions is governed by an infinite-dimensional linear operator. For practical application of Koopman operator theory, various data-driven methods have been developed to derive lifted state-space models via approximation to the Koopman operator. Based on approximate models, several Koopman-based model predictive control (KMPC) schemes have been proposed. However, since a finite-dimensional approximation to the infinite-dimensional Koopman operator cannot fully represent a nonlinear dynamical system, plant-model mismatch inherently exists in these KMPC schemes and negatively influences the performance of control systems. In this work, we present offset-free Koopman Lyapunov-based model predictive control (KLMPC) framework that addresses the inherent plant-model mismatch in KMPC schemes using an offset-free control framework based on a disturbance estimator approach and ensures feasibility and stability of the control system by applying Lyapunov constraints to the optimal control problem. The zero steady-state offset condition of the developed framework is mathematically examined. The effectiveness of the developed framework is also demonstrated by comparing the closed-loop results of the proposed offset-free KLMPC and the nominal KLMPC.

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