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Open AccessArticle

Distributed Economic Dispatch Scheme for Droop-Based Autonomous DC Microgrid

1
Jiangsu Engineering Laboratory of Gas-Electricity Integrated Energy, Nanjing Normal University, Nanjing 210023, China
2
Jiangsu Key Laboratory of Smart Grid Technology and Equipment, Southeast University, Nanjing 210096, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(2), 404; https://doi.org/10.3390/en13020404
Received: 28 October 2019 / Revised: 8 January 2020 / Accepted: 10 January 2020 / Published: 14 January 2020
(This article belongs to the Special Issue Advanced Control in Microgrid Systems)
In this paper, a distributed economic dispatch scheme considering power limit is proposed to minimize the total active power generation cost in a droop-based autonomous direct current (DC) microgrid. The economical dispatch of the microgrid is realized through a fully distributed hierarchical control. In the tertiary level, an incremental cost consensus-based algorithm embedded into the economical regulator is utilized to search for the optimal solution. In the secondary level, the voltage regulator estimating the average voltage of the DC microgrid is used to generate the voltage correction item and eliminate the power and voltage oscillation caused by the deviation between different items. Then, the droop controller in the primary level receives the reference values from the upper level to ensure the output power converging to the optimum while recovering the average voltage of the system. Further, the dynamic model is established and the optimal communication network topology minimizing the impact of time delay on the voltage estimation is given in this paper. Finally, a low-voltage DC microgrid simulation platform containing different types of distributed generators is built, and the effectiveness of the proposed scheme and the performance of the optimal topology are verified.
Keywords: DC microgrid; droop control; economic dispatch; voltage regulation; consensus algorithm; communication delay; topology optimization DC microgrid; droop control; economic dispatch; voltage regulation; consensus algorithm; communication delay; topology optimization
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MDPI and ACS Style

Lv, Z.; Wu, Z.; Dou, X.; Zhou, M.; Hu, W. Distributed Economic Dispatch Scheme for Droop-Based Autonomous DC Microgrid. Energies 2020, 13, 404.

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