4.8 Article

Model-Free Energy Management System for Hybrid Alternating Current/Direct Current Microgrids

Journal

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 68, Issue 5, Pages 3982-3991

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.2984993

Keywords

Energy storage; hierarchical control; hybrid ac; dc microgrid; power-based control (PBC); power sharing

Funding

  1. Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior Brasil (CAPES) [001]
  2. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [420850/2016-3]
  3. Pro-Reitoria de Pesquisa (PRPq) da Universidade Federal de Minas Gerais

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This article proposes a centralized energy management approach for coordinated control of a hybrid ac/dc microgrid, aiming to improve efficiency and ensure uniform operation of energy storage units in different modes.
A hybrid ac/dc microgrid combines the benefits of ac and dc power systems. It provides high efficiency and is compatible with conventional ac distribution network. This article proposes a centralized energy management approach to perform coordinated control on a hybrid ac/dc microgrid as a single-controllable entity. The central controller relies on low-bandwidth communication channels and is aimed at achieving 1) proportional power sharing among energy storage units located in both dc and ac sides of the microgrid, 2) state-of-charge equalization of the energy storage units, 3) grid power flow control, 4) plug-and-play capability, and 5) operation in grid-connected and islanded modes through an interlinking utility interface converter. The state-of-charge equalization method guarantees uniform operation of the energy storage units during both charge and discharge modes considering typical operational transients. Finally, the proposed model-free approach is evaluated experimentally through a laboratory-scale hybrid ac/dc microgrid in different operational conditions in both grid-connected and islanded operating modes.

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