基于节点源荷电流差分的直流微电网储能变换器控制策略

doi:10.19595/j.cnki.1000-6753.tces.211083

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Abstract In DC microgrid (DC MG), the variation of distributed generation power and load power, as well as the short circuit of transmission line, will cause the fluctuation of DC bus voltage. Therefore, the response speed of energy storage unit is very important to improve the stability of DC MG. In this paper, a control strategy based on node differential current (NDCC) for DC MG energy storage converter is proposed. By calculating the power difference between the source and load of the DC microgrid, the energy storage interaction power is determined, and the energy storage regulation current is calculated, so as to adjust the duty cycle of the energy storage converter. Compared with the finite set model predictive control, it eliminates the process of traversing the working state and optimization of the energy storage converter, reduces the amount of on-line calculation, and the proposed strategy is not affected by the inductance. Therefore, the response the speed and the accuracy are improved. The fluctuations of the bus voltage and the load current are also reduced. Finally, simulation and experiments verify the effectiveness of the proposed strategy.

Key words： DC microgrid energy storage converter differential current power coordination model prediction

Received: 19 July 2021

PACS:

TM727

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	Articles by authors
	Zhang Weiliang
	Zhang Hui
	Zhi Na
	Wang Hanwei
	Zeng Cheng

Cite this article:

Zhang Weiliang,Zhang Hui,Zhi Na等. Control Strategy of DC Microgrid Energy Storage Converter Based on Node Differential Current[J]. Transactions of China Electrotechnical Society, 2022, 37(9): 2199-2210.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.211083 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I9/2199

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