Updated version "Robust Voltage Regulation of DC-DC Buck Converter With ZIP Load via An Energy Shaping Control Approach"

TL;DR

This paper introduces an adaptive energy shaping control approach for stabilizing DC-DC buck converters with ZIP loads, ensuring robustness against disturbances and parameter variations through stability analysis, simulation, and experiments.

Contribution

It develops an adaptive energy shaping controller with disturbance observer for robust voltage regulation in buck converters with ZIP loads, including stability guarantees and practical validation.

Findings

The proposed controller achieves stable voltage regulation under ZIP load variations.

Simulation and experimental results confirm the robustness and effectiveness of the control scheme.

The method ensures stability despite parameter perturbations and unknown disturbances.

Abstract

ZIP loads (the parallel combination of constant impedance loads, constant current loads and constant power loads) exist widely in power system. In order to stabilize buck converter based DC distributed system with ZIP load, an adaptive energy shaping controller (AESC) is devised in this paper. Firstly, based on the assumption that lumped disturbances are known, a full information controller is designed in the framework of the port Hamiltonian system via energy shaping technique. Besides, using mathematical deductive method, an estimation of the domain of attraction is given to ensure the strict stability. Furthermore, to eliminate the influence of parameter perturbations on the system, a disturbance observer is proposed to reconstruct the lumped disturbances and then the estimated terms are introduced to above controller to form an AESC scheme. In addition, the stability analysis of the closed-loop system is given. Lastly, the simulation and experiment results are presented for assessing the designed controller.