Abstract
This paper proposes a multifunctional hybrid unified power quality conditioner (UPQC-H), adapted to operate as an interface converter between utility grids and hybrid microgrids (H-MG). In addition to the generation of both ac and dc buses to the H-MGs, the main structure of the UPQC-H can also integrate distributed generation (DG) systems and energy storage systems (ESS) without the need for changing any control strategy. The proposed UPQC-H is built by including two additional power switches to the conventional three-phase UPQC power circuit, which in its traditional configuration is composed of two three-phase inverters used to operate as series and parallel converters. Some advantages related to the proposed UPQC-H configuration can be highlighted, as follows: 1) versatile application to any H-MG configuration; 2) natural power exchange between the H-MG ac and dc buses of both grid-connected and islanded operating modes; 3) seamless transitions between the islanded and grid-connected operating modes, and vice versa; and 4) smoothing of intermittency issues associated to renewable energy sources. Extended static and dynamic experimental results are presented to evaluate the UPQC-H performance and explore its functionalities when interfacing a 3-phase utility grid and an H-MG with integrating photovoltaic-based DG and ESS.
Original language | English |
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Article number | 107638 |
Journal | International Journal of Electrical Power and Energy Systems |
Volume | 136 |
ISSN | 0142-0615 |
DOIs | |
Publication status | Published - Mar 2022 |
Bibliographical note
Funding Information:The authors gratefully acknowledge the financial support received from CNPq - Brazil, process no. 303359/2018-8. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brazil (CAPES) - Finance Code 001. J.M. Guerrero was supported by VILLUM FONDEN under the VILLUM Investigator Grant (no. 25920): Center for Research on Microgrids (CROM); www.crom.et.aau.dk.
Publisher Copyright:
© 2021 Elsevier Ltd
Keywords
- Hybrid microgrid
- Interface converter
- Multifunctional UPQC
- Power quality improvement
- Power-line conditioning