On Port-Hamiltonian Formulation of Hysteretic Energy Storage Elements: The Backlash Case

TL;DR

This paper develops a port-Hamiltonian framework for hysteretic energy storage elements, specifically backlash and hysteretic inductors, highlighting their dissipativity and energy properties in circuit models.

Contribution

It introduces a novel port-Hamiltonian formulation for hysteretic elements using a family of storage functions, linking dissipativity with system modeling.

Findings

Derived storage functions linked to dissipativity properties.

Presented a port-Hamiltonian model of hysteretic inductors with energy dissipation.

Applied the formulation to RLC circuits with hysteretic inductors.

Abstract

This paper presents a port-Hamiltonian formulation of hysteretic energy storage elements. First, we revisit the passivity property of backlash-driven storage elements by presenting a family of storage functions associated to the dissipativity property of such elements. We explicitly derive the corresponding available storage and required supply functions `a la Willems [1], and show the interlacing property of the aforementioned family of storage functions sandwiched between the available storage and required supply functions. Second, using the proposed family of storage functions, we present a port-Hamiltonian formulation of hysteretic inductors as prototypical storage elements in port-Hamiltonian systems. In particular, we show how a Hamiltonian function can be chosen from the family of storage functions and how the hysteretic elements can be expressed as port-Hamiltonian system with feedthrough term, where the feedthrough term represents energy dissipation. Correspondingly, we illustrate its applicability in describing an RLC circuit (in parallel and in series) containing a hysteretic inductor element.