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Open AccessArticle

Power Distribution Strategy of Microgrid Hybrid Energy Storage System Based on Improved Hierarchical Control

1
Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System, Hubei University of Technology, Wuhan 430068, China
2
Hanjiang Water Resources & Hydropower Group Co., Ltd., Danjiangkou Hydropower Plant, Danjiangkou 442700, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(18), 3498; https://doi.org/10.3390/en12183498
Received: 20 August 2019 / Revised: 3 September 2019 / Accepted: 7 September 2019 / Published: 11 September 2019
(This article belongs to the Special Issue Hybrid Storage Technologies in Solar Energy Based Smart Cities)
Traditional hierarchical control of the microgrid does not consider the energy storage status of a distributed hybrid energy storage system. This leads to the inconsistency of the remaining capacity of the energy storage system in the process of system operation, which is not conducive to the safe and stable operation of the system. In this paper, an improved hierarchical control strategy is proposed: the first allocation layer completes the allocation between the distribution energy storage systems considering the state of hybrid energy storage systems, and the second allocation layer realizes the allocation within the hybrid energy storage systems based on variable time constant low-pass filtering. Considering the extreme conditions of energy storage systems, the transfer current is introduced in the second allocation process. The SOC (stage of charge) of the supercapacitor is between 40% and 60%, which ensures that the supercapacitor has enough margin to respond to the power demand. An example of a 300 MW photovoltaic microgrid system in a certain area is analyzed. Compared with the traditional hierarchical control, the proposed control strategy can reduce the SOC change of a hybrid energy storage system by 9% under the same conditions, and make the supercapacitor active after power stabilization, which is helpful to the stable operation of the microgrid. View Full-Text
Keywords: distributed hybrid energy storage system (D-HESS); improved low pass filter; hierarchical control; power management strategy; Li-ion battery; supercapacitors distributed hybrid energy storage system (D-HESS); improved low pass filter; hierarchical control; power management strategy; Li-ion battery; supercapacitors
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Wu, T.; Yu, W.; Wang, L.; Guo, L.; Tang, Z. Power Distribution Strategy of Microgrid Hybrid Energy Storage System Based on Improved Hierarchical Control. Energies 2019, 12, 3498.

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