Mode-Adaptive Decentralized Control for Renewable DC Microgrid With Enhanced Reliability and Flexibility

A mode-adaptive decentralized control strategy is proposed for the power management of a dc microgrid with multiple renewable distributed generators and energy storage systems. In the presented solution, the dc bus voltage signal is used not only to enable power sharing among different sources, but...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2014-09, Vol.29 (9), p.5072-5080
Main Authors: Gu, Yunjie, Xiang, Xin, Li, Wuhua, He, Xiangning
Format: Article
Language:English
Subjects:
Applied sciences
Control
Control systems
Convertors
DC microgrid
Decentralized control
Direct current
Direct energy conversion and energy accumulation
Distributed generation
Electric currents
Electric potential
Electrical engineering. Electrical power engineering
Electrical equipment
Electrical machines
Electrical power engineering
Energy accumulation
Exact sciences and technology
Flexibility
Generators
Microgrids
Miscellaneous
mode-adaptive
Power generation
Power networks and lines
Power system reliability
Regulation and control
Reliability
Strategy
Switches
Test systems
Voltage
Voltage control
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Summary:A mode-adaptive decentralized control strategy is proposed for the power management of a dc microgrid with multiple renewable distributed generators and energy storage systems. In the presented solution, the dc bus voltage signal is used not only to enable power sharing among different sources, but also to designate microgrid operation modes and facilitate seamless mode transitions. With this mode-adaptive operation mechanism, a greater control freedom can be achieved than the conventional dc voltage droop control scheme. More importantly, this approach features fully self-disciplined regulation of distributed converters without an extra control center or communication link. Therefore, both reliability and flexibility can be enhanced. Meanwhile, a novel mode definition criterion is also provided to highlight the special characteristics of the dc microgrid which is different from an ac one. Three typical operation conditions are summarized according to which type of sources are dominating the power balance. Finally, the effectiveness of the proposed technique is verified experimentally based on a composite dc microgrid test system.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2013.2294204