Decentralized Power Sharing Control for Parallel-Connected Inverters in Islanded Single-Phase Micro-Grids

In this paper, a Lyapunov function-based decentralized control scheme is proposed for a single-phase parallel-connected inverters system within islanded micro-grid. With this novel method, a proper voltage regulation (e.g., amplitude and waveform quality) and excellent power and current sharing perf...

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Bibliographic Details
Published in:IEEE transactions on smart grid 2018-11, Vol.9 (6), p.6721-6730
Main Authors: Wang, Keyou, Huang, Xin, Fan, Bo, Yang, Qinmin, Li, Guojie, Crow, Mariesa L.
Format: Article
Language:English
Subjects:
Control systems
Current sharing
Decentralized control
decentralized controller
Electric power grids
Hardware-in-the-loop simulation
Impedance
Inverters
islanded micro-grid
Liapunov functions
Load modeling
Lyapunov function
Lyapunov methods
Parallel connected
parallel inverters
power sharing
Redundancy
Stability analysis
Voltage control
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Summary:In this paper, a Lyapunov function-based decentralized control scheme is proposed for a single-phase parallel-connected inverters system within islanded micro-grid. With this novel method, a proper voltage regulation (e.g., amplitude and waveform quality) and excellent power and current sharing performance can be well ensured even in the presence of unknown line impedance and unbalanced LC filter parameters. In addition, high reliability and robustness can be guaranteed since no inter-communication among inverters as well as no centralized controller is demanded, which also delivers advantages of scalability and redundancy. The stability of the closed-loop system is ensured by standard Lyapunov method. The designation of the decentralized controller is simple to implement but rather effective. Detailed simulation and hardware-in-the-loop experimental results are presented to validate the feasibility of the proposed scheme under different operating conditions.
ISSN:1949-3053
1949-3061
DOI:10.1109/TSG.2017.2720683