Journal
IEEE TRANSACTIONS ON SMART GRID
Volume 11, Issue 2, Pages 942-957Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSG.2019.2928330
Keywords
Voltage control; Frequency control; Stability analysis; Computer architecture; Decentralized control; Microgrids; Reactive power; Networked microgrids; hierarchical control; distributed cooperative control; resiliency; small-signal stability
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Funding
- National Key R&D Program of China [2016YFB0900600]
- National Natural Science Foundation of China [51807004, 51807005]
- China Post-Doctoral Science Foundation [2017M620600]
- U.S. Department of Energy
- Villum Investigator Grant from The Villum Foundation [999730]
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This paper presents a two-layer distributed cooperative control method for networked microgrid (NMG) systems, taking into account the proprietary nature of microgrid (MG) owners. The proposed control architecture consists of an MG-control layer and an NMG-control layer. In the MG layer, the primary and distributed secondary controls realize accurate power sharing among distributed generators (DGs) and the frequency/voltage reference following within each MG. In the NMG layer, the tertiary control enables regulation of the power flowing through the point of common coupling (PCC) of each MG in a decentralized manner. Furthermore, distributed quaternary control restores the system frequency and critical bus voltage to their nominal values and ensures accurate power sharing among MGs. A small-signal dynamic model is developed to evaluate the dynamic performance of NMG systems with the proposed control method. Time-domain simulations and experiments on NMG test systems are performed to validate the effectiveness of the proposed method.
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