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The constant voltage strategy (CVS) is more suitable for the small-capacity dc microgrid applications to form the dc bus voltage because it can eliminate the steady voltage deviation. However, its dynamic performance is slowed down by the integrator in the voltage loop and negatively influenced by the load steps. Some advanced methods have been conducted in the literature. However, their principle is to increase the system bandwidth, which is limited because the bandwidth is generally designed about one-tenth of the switching frequency and cannot be increased infinitely. This work pays efforts to increase the gain within the system bandwidth to accelerate the transient response and simultaneously eliminate the influence of the integrator. Therefore, the non-integrator disturbance observer-based (NIDOB) strategy is proposed in this work, and it can feed the load current into the current reference to replace the output of the integrator. Compared to the traditional and non-integrator directly-feedforward (NIDF) strategy, it has a better dynamic performance. Compared to the bandwidth-increased strategy, it does not introduce more noise. The theoretical analysis and experimental results prove its advantages.

Titel:	A current reference-enhanced strategy endows the GFC in DC microgrids better dynamic response.
Autor/in / Beteiligte Person:	Xie, W ; Zheng, X ; Shi, M ; Jia, J
Link:	Full Text Finder (Volltext)
Zeitschrift:	Scientific reports, Jg. 14 (2024-04-13), Heft 1, S. 8578
Veröffentlichung:	London : Nature Publishing Group, copyright 2011-, 2024
Medientyp:	academicJournal
ISSN:	2045-2322 (electronic)
DOI:	10.1038/s41598-024-58928-5
Sonstiges:	Nachgewiesen in: MEDLINE Sprachen: English Publication Type: Journal Article Language: English [Sci Rep] 2024 Apr 13; Vol. 14 (1), pp. 8578. <i>Date of Electronic Publication: </i>2024 Apr 13. References: Saafan, A. A., Khadkikar, V., Moursi, M. S. E. & Zeineldin, H. H. A new multiport DC-DC converter for DC microgrid applications. IEEE Trans. Ind. Appl. 59(1), 601–611 (2023). (PMID: 10.1109/TIA.2022.3213235) ; Xie, W., Han, M., Cao, W., Guerrero, J. M. & Vasquez, J. C. Virtual resistance tradeoff design for DCMG grid-forming converters considering static- and large-signal dynamic constraints. IEEE Trans. Power Electron. 36(5), 5582–5593 (2021). (PMID: 10.1109/TPEL.2020.3029716) ; Pires, V. F., Cordeiro, A., Roncero-Clemente, C., Rivera, S. & Dragičević, T. DC–DC converters for bipolar microgrid voltage balancing: A comprehensive review of architectures and topologies. IEEE J. Emerg. Sel. Top. Power Electron. 11(1), 981–998 (2023). (PMID: 10.1109/JESTPE.2022.3208689) ; E. 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(PMID: 10.1109/LRA.2020.3047779) Grant Information: BK20230168 Natural Science Foundation of Jiangsu Province, China; BK20230168 Natural Science Foundation of Jiangsu Province, China; BK20230168 Natural Science Foundation of Jiangsu Province, China; 52207102 National Natural Science Foundation of China Contributed Indexing: Keywords: Current reference enhancement; DC microgrids; Dynamic performance; Load disturbances; Non-integrator control Entry Date(s): Date Created: 20240413 Latest Revision: 20240413 Update Code: 20240414

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A current reference-enhanced strategy endows the GFC in DC microgrids better dynamic response.