Distributed Economic Dispatch Scheme for Droop-Based Autonomous DC Microgrid

Energies

卷:13

Zhenyu Lv¹  Min Zhou¹  Zaijun Wu²  Xiaobo Dou²  Wenqiang Hu² 

[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;

关键词: dc microgrid;    droop control;    economic dispatch;    voltage regulation;    consensus algorithm;    communication delay;    topology optimization;   

DOI  :  10.3390/en13020404

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown