PI-Consensus Based Distributed Control of AC Microgrids

The conventional voltage observer based distributed control can make a tradeoff between voltage restoration and reactive power sharing. However, it suffers from estimation error when there exist input disturbances, such as initial values and communication delays. To address this problem, this paper...

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Bibliographic Details
Published in:IEEE transactions on power systems Vol. 35; no. 3; pp. 2268 - 2278
Main Authors: Shi, Mengxuan, Chen, Xia, Zhou, Jianyu, Chen, Yin, Wen, Jinyu, He, Haibo
Format: Journal Article
Language:English
Published: New York IEEE 01.05.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Computer simulation
Control stability
Control systems design
Decentralized control
Delays
Distributed generation
distributed generator (DG)
Disturbances
Frequency control
Microgrid
Microgrids
Observers
PI consensus algorithm
Reactive power
Restoration
Systems stability
time delay
Voltage control
Voltage controllers
ISSN:0885-8950, 1558-0679
Online Access:Get full text
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Summary:The conventional voltage observer based distributed control can make a tradeoff between voltage restoration and reactive power sharing. However, it suffers from estimation error when there exist input disturbances, such as initial values and communication delays. To address this problem, this paper proposes a novel distributed secondary control based on PI consensus algorithm. A voltage controller and a frequency controller are designed separately to realize the restoration of voltage/frequency and also accurate reactive/active power allocation. Moreover, a detailed small-signal model with PI consensus algorithm is established to show the impact of the proposed control strategy on the system stability. Compared with the conventional distributed control, the proposed control scheme is simpler with higher control accuracy under input disturbances. Simulations are conducted to verify the effectiveness of the proposed control strategy in an isolated ac microgrid.
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ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2019.2950629