Port-Hamiltonian nonlinear systems

TL;DR

This paper discusses port-Hamiltonian systems theory as a unified framework for modeling, analyzing, and controlling complex physical systems by leveraging their inherent energy structures, with recent advances using energy ports.

Contribution

It introduces novel developments in control by interconnection using energy ports, enhancing the existing port-Hamiltonian systems framework for nonlinear systems.

Findings

Unified modeling of multiphysics systems

Control laws exploiting physical structure are simple and robust

Energy port approach offers new control strategies

Abstract

Control theory often takes the mathematical model of the to-be-control-led system for granted. In contrast, port-Hamiltonian systems theory bridges the gap between modelling and control for physical systems. It provides a unified framework for the modelling of complex multiphysics systems. At the same time it offers powerful tools for analysis and control by identifying the underlying physical structure, as reflected in, e.g., energy balance and other conserved quantities. This leads to control schemes that \emph{exploit} the physical structure, instead of compensating for it. As a result, the derived control laws tend to be simple, physically interpretable, and robust with respect to physical parameter variations. In this paper, after introducing port-Hamiltonian systems, the focus is on 'control by interconnection' for set-point stabilization of nonlinear physical systems. Most of this theory is well-established, but novel developments using 'energy ports' instead of 'power ports' are also included.