Comparative Study of Control Strategies for Stabilization and Performance Improvement of DC Microgrids with a CPL Connected

Isaías V. de Bessa, Renan L. P. de Medeiros, Iury Bessa, Florindo A. C. Ayres Junior, Alessandra R. de Menezes, Gustavo M. Torres and João Edgar Chaves Filho
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Isaías V. de Bessa: Department of Electricity, Federal University of Amazonas, Manaus-AM 69080-900, Brazil
Renan L. P. de Medeiros: Department of Electricity, Federal University of Amazonas, Manaus-AM 69080-900, Brazil
Iury Bessa: Department of Electricity, Federal University of Amazonas, Manaus-AM 69080-900, Brazil
Florindo A. C. Ayres Junior: Department of Electricity, Federal University of Amazonas, Manaus-AM 69080-900, Brazil
Alessandra R. de Menezes: Department of Electricity, Federal University of Amazonas, Manaus-AM 69080-900, Brazil
Gustavo M. Torres: Department of Electricity, Federal University of Amazonas, Manaus-AM 69080-900, Brazil
João Edgar Chaves Filho: Department of Electricity, Federal University of Amazonas, Manaus-AM 69080-900, Brazil

Energies, 2020, vol. 13, issue 10, 1-29

Abstract: The DC microgrid system is composed by converters that operate like feeders and loads. Among these loads, we highlight the constant power loads (CPLs) that may cause instability in the microgrid, observed in the form of undesired oscillations due to its negative impedance behavior. Therefore, this work proposes to use performance indices and stability margins to evaluate state and output feedback control strategies for stabilization of DC microgrids. In particular, it is proposed to evaluate the stability margin of the proposed methodologies by means of the impedance relations in the microgrid based on the Middlebrook criterion. Our simulations and tests showed the relation between the performance and stability degradation and the microgrid impedances variation.

Keywords: DC microgrids; CPL; performance indices; input impedance; middlebrook criterion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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