Accurate Distributed Secondary Control for DC Microgrids Considering Communication Delays: A Surplus Consensus-Based Approach

The state-of-the-art dynamic consensus-based microgrid (MG) secondary controls suffer from the communication delay effect. Specifically, the system could not converge to the desired operating points with time-delayed communications. Such deviations are hard to detect in a decentralized manner and co...

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Bibliographic Details
Published inIEEE transactions on smart grid Vol. 13; no. 3; pp. 1709 - 1719
Main Authors Du, Yuhua, Lu, Xiaonan, Tang, Wenyuan
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 01.05.2022
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Algorithms
Communication
Communication delay
consensus algorithms
Controllers
Convergence
DC microgrid
Delay
Delay effects
Delays
Design parameters
Deviation
distributed control
Distributed generation
Mathematical analysis
Observers
Regulation
secondary control
Stability analysis
Steady-state
surplus consensus
Voltage control
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Summary:The state-of-the-art dynamic consensus-based microgrid (MG) secondary controls suffer from the communication delay effect. Specifically, the system could not converge to the desired operating points with time-delayed communications. Such deviations are hard to detect in a decentralized manner and could destabilize the system. This paper proposes an accurate distributed secondary controller for DC MGs based on the surplus consensus algorithm. The proposed controller achieves accurate proportional power sharing and average voltage regulation among distributed generators (DGs) with the presence of variable and bounded communication delays. A surplus consensus-based observer is developed. The developed observer is proved robust against variable and bounded communication delays; it tracks the average of a group of dynamic states with zero steady-state deviations, which cannot be done using the conventional dynamic consensus-based observer. The convergence speed of the developed observer is analyzed and a parameter design procedure is presented. Moreover, the delay-dependent stability analysis of DC MG operation with the proposed secondary controller is derived. The marginal delay that leads the system to instability is calculated. At last, the performance of the proposed secondary controller and the developed stability analysis are validated under various scenarios using MATLAB/Simulink.
ISSN:1949-3053
1949-3061
DOI:10.1109/TSG.2022.3141395