Autonomous Power Management in LVDC Microgrids Based on a Superimposed Frequency Droop

In this paper, a novel droop approach for autonomous power management in low voltage DC (LVDC) microgrids based on a master-slave concept is presented. Conventional voltage-based droop approaches suffer from poor power sharing due to line resistance effects on a virtual resistance, which is solved b...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2018-06, Vol.33 (6), p.5341-5350
Main Authors: Peyghami, Saeed, Mokhtari, Hossein, Blaabjerg, Frede
Format: Article
Language:English
Subjects:
Autonomous control
Batteries
Communications systems
Control systems
Current sharing
dc microgrid (MG)
Distributed generation
Electric power grids
Energy management
FCC
Frequency control
Integrated circuits
interlinking converter (IC)
Low voltage
Microgrids
Power management
Voltage control
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Summary:In this paper, a novel droop approach for autonomous power management in low voltage DC (LVDC) microgrids based on a master-slave concept is presented. Conventional voltage-based droop approaches suffer from poor power sharing due to line resistance effects on a virtual resistance, which is solved by introducing a communication system to increase the current sharing accuracy. In this paper, a virtual frequency is superimposed by the master units, and slave units determine their output power according to the corresponding frequency-based droop characteristics. Unlike the voltage-droop methods, the proposed virtual frequency-droop approach can be applied for proportional power management among the energy units and loads in the microgrid without utilizing any extra communication system. The effectiveness of the proposed scheme is evaluated by simulations and further validated by experiments.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2017.2731785