A Comprehensive Solution to Decentralized Coordinative Control of Distributed Generations in Islanded Microgrid Based on Dual-Frequency-Droop

In an autonomous ac microgrid system, a peer-to-peer decentralized solution would be a preferred choice for the coordinative control of distributed generation units. However, due to the dispersed sources and loads, and mismatched line impedances, it is hard to achieve satisfactory power sharing perf...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2022-03, Vol.37 (3), p.3583-3598
Main Authors: An, Ronghui, Liu, Zeng, Liu, Jinjun, Liu, Baojin
Format: Article
Language:English
Subjects:
Decentralized
Distributed generation
dual-frequency-droop
dynamic droop-slope regulator (DDR)
Frequency control
Frequency deviation
Frequency ranges
Harmonic analysis
Impedance
Microgrids
Power distribution
power sharing
Ripples
small-ac-signal injection
Voltage control
Voltage measurement
Waveforms
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Summary:In an autonomous ac microgrid system, a peer-to-peer decentralized solution would be a preferred choice for the coordinative control of distributed generation units. However, due to the dispersed sources and loads, and mismatched line impedances, it is hard to achieve satisfactory power sharing performance and power quality without communication links. Therefore, a comprehensive decentralized solution based on dual-frequency-droop is proposed in this article. With only local information, appropriate virtual impedances could be obtained to compensate the mismatched complex line impedances in the required frequency range, and hence active, reactive, unbalanced, and harmonic powers could be shared accurately among parallel inverters under various load conditions. Then, the frequency deviation caused by the droop control is effectively attenuated without affecting power sharing through a dynamic droop-slope regulator. Moreover, the causes of steady-state ripples on virtual impedance waveforms are carefully analyzed, and the design criterions to eliminate these ripples are provided. Finally, case studies are provided in simulations and experiments to validate the effectiveness of this method.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2021.3115522