Gonzalez-Candelario, Carlos O.

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    Autonomous control for interconnected DC microgrids
    (2021-12-09) Gonzalez-Candelario, Carlos O.; Aponte, Erick E.; College of Engineering; Andrade-Rengifo, Fabio; Darbali, Rachid; Department of Electrical and Computer Engineering; Rios, Karen
    The energy industry is experiencing a radical change, as customers are demanding for a more reliable service at the lowest possible cost. Distributed Energy Resources and Microgrids are one of the alternatives being used to achieve such goal. Commonly, DC Microgrids are controlled with high bandwidth communications, but an autonomous strategy can serve as its contingency plan. Frequently, these DC Microgrids are controlled using the droop control method, seeking low voltage regulation and proportional load sharing. Its control becomes more complex when having interconnected DC Microgrids as multiple energy resources are coordinated as well as the power exchange among the participating assets. In this thesis, simulation, mathematical, and experimental models were developed to examine an autonomous control strategy between two interconnected DC Microgrids, based on matching the interconnecting and internal bus voltages. The system under study is examined on three scenarios: standalone operation of each DC Microgrid, excess generation, and generation deficit in one DC Microgrid. Results were obtained and compared using the Sandia National Laboratories Secure Scalable Microgrid Simulink library, MATLAB models, and the Power Hardware-in-the-Loop experimental configuration developed at the UPRM Sustainability Energy Center Laboratory.