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 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 (HIL) experimental results are presented to validate the feasibility of the proposed scheme under different operating conditions.


Electrical and Computer Engineering


National Key R&D Plan of China
National Natural Science Foundation (China)
State Grid Technology Program


This work was supported by National Key R&D Plan of China (2016YFB0900504), the National Natural Science Foundation of China (61673347), and State Grid Technology Program (52094016000F).

Keywords and Phrases

Controllers; Electric impedance; Electric inverters; Electric load management; Electric power system control; Electric power transmission networks; Lyapunov functions; Lyapunov methods; Redundancy; Voltage control; Voltage regulators; Decentralized controller; Islanded micro grids; Load modeling; Parallel inverter; Power sharing; Stability analysis; Decentralized control; Impedance; Inverters; Islanded micro-grid

International Standard Serial Number (ISSN)

1949-3053; 1949-3061

Document Type

Article - Journal

Document Version


File Type





© 2017 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Jun 2017