Work

A Generalized Proportional–Integral Disturbance Observer for DC-Link Voltage Control in Grid-Connected Power Converters

Year: 2026

Type: article

Abstract: Grid-connected converters (GCC) commonly rely on proportional–integral (PI) controllers for DC-link voltage regulation. However, their performance can significantly degrade in the presence of parameter variations and external disturbances, resulting in overshoot, undershoot, and slow transient response. To address these limitations, this paper proposes a generalized proportional–integral observer (GPIO)-based control strategy for single-phase GCC. The proposed method improves disturbance estimation and rejection, thereby enhancing robustness against system uncertainties while ensuring fast and accurate DC-link voltage regulation. The main contribution of this work lies in the development of a GPIO-based controller that combines improved dynamic performance with strong disturbance rejection capability, without increasing control complexity. The proposed approach is validated through both simulation and experimental results, which demonstrate its effectiveness and superiority over conventional PI-based control in terms of transient response, stability, and robustness.

Source: Energies

DOI: 10.3390/en19143394

Authors: Mariem Dardouri, Sejir Khojet El Khil, Khaled Jelassi, Alexandre De Bernardinis

Institutions: CentraleSupélec, Laboratoire Matériaux, Optique, Photonique et Systèmes, Université de Lorraine, National Engineering School of Tunis, Tunis El Manar University

Language: English

Topic: Microgrid Control and Optimization

Subfield: Control and Systems Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Industry, innovation and infrastructure, Affordable and clean energy

Open Access status: gold

Estimated APC paid: $3,137