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Optimal and Decentralized Control Strategies for Inverter-Based AC Microgrids
Open AccessArticle

Control Method of Parallel Inverters with Self-Synchronizing Characteristics in Distributed Microgrid

1
Key Laboratory of Distributed Energy Storage and Micro-Grid in Hebei, North China Electric Power University, Baoding 071003, Hebei, China
2
School of Electrical and Electric Engineering, North China Electric Power University, Changping District, Beijing 102206, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(20), 3871; https://doi.org/10.3390/en12203871
Received: 29 July 2019 / Revised: 16 September 2019 / Accepted: 9 October 2019 / Published: 12 October 2019
(This article belongs to the Special Issue Advanced Control in Microgrid Systems)
The centralized control mode is no longer applicable for microgrid operation due to the high penetration rate of distributed energy, which is responsible for the widespread interest in the use of the distributed microgrid. Focusing on the issues of power coupling and uncontrollable droop coefficient at the terminal of the connecting line between the micro-source and AC bus, which is rarely considered, this paper proposes an improved virtual synchronous generator (VSG) control strategy based on local data considering precise control of the droop coefficient and realizing the power decoupling and the expected droop characteristics. Then, combined with the virtual rotor characteristic matching method, the reasonable active and reactive power sharing of the parallel microgrid inverters are realized in terms of static and dynamic performance without additional improvement of reactive power control. Finally, the effectiveness and feasibility of the proposed method are verified based on the MATLAB/Simulink simulation platform. The combination of the proved strategy and matching principle endows inverters with self-synchronization characteristics, forming the self-synchronizing voltage sources, which gives the distributed microgrid a higher self-stability, autonomy and robustness to ensure the stable operation of the microgrid.
Keywords: distributed microgrid; virtual synchronous generator (VSG); self-synchronizing voltage source; power coupling; parallel operation distributed microgrid; virtual synchronous generator (VSG); self-synchronizing voltage source; power coupling; parallel operation
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MDPI and ACS Style

Yan, X.; Cui, Y.; Cui, S. Control Method of Parallel Inverters with Self-Synchronizing Characteristics in Distributed Microgrid. Energies 2019, 12, 3871.

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