Discrete-Time I&I Adaptive Interconnection and Damping Passivity-Based Control for Nonlinearly Parameterized Port-Controlled Hamiltonian Systems

TL;DR

This paper develops a discrete-time adaptive interconnection and damping passivity-based control for uncertain port-controlled Hamiltonian systems with nonlinear parameterization, ensuring stability and improved performance through a novel estimator.

Contribution

It introduces a new discrete-time I&I adaptive IDA-PBC controller for nonlinear parameter uncertainties in PCH systems, with proven stability guarantees.

Findings

The adaptive controller maintains system stability.

Simulation results confirm improved control performance.

The method effectively handles nonlinear parameter uncertainties.

Abstract

In this paper, a discrete-time I&I-based adaptive IDA-PBC controller for uncertain nonlinearly parameterized port-controlled Hamiltonian systems (PCH), where the parameter uncertainties are assumed in the energy function, is constructed. A proper formulation for the uncertain system dynamics is established where the uncertainties appear in nonlinearly parameterized form in the gradient of the Hamiltonian function. The adaptive IDA-PBC controller is constructed considering this formulation. For the adaptation mechanism of the IDA-PBC controller, a discrete-time parameter estimator is derived based on the immersion and invariance (I&I) approach. A structure for a free design function in the I&I-based estimator is proposed including some other free design functions. If these free design functions are selected to satisfy some conditions, derived in this paper, the Lyapunov asymptotic stability of the estimator dynamics is guaranteed. Besides, assuming these conditions are satisfied, local asymptotic stability of the closed-loop system, in a sufficiently large set is shown. The proposed method is applied to the two physical system examples and the performance of the adaptive controller is tested by simulation. It is demonstrated that the performance of the certain IDA-PBC controller is maintained by the adaptive IDA-PBC controller successfully.