Power Distribution Control Strategy of Hybrid Energy Storage System in Isolated DC Microgrid

2021 IEEE 4th International Conference on Renewable Energy and Power Engineering (REPE) Pub Date : 2021-10-09 DOI:10.1109/REPE52765.2021.9617016

Junhao Cui, G. Tian, Guangchen Liu, Sufang Wen, Zihao Guo

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Abstract

Energy storage (ES) system in DC microgrid has the functions of stabilizing bus voltage and improving power quality, it is an important part of DC microgrid. The battery-supercapacitor hybrid energy storage system (HESS) has more advantages than traditional ES system. In order to make full use of the advantages of HESS and realize the reasonable distribution of power, a power distribution control strategy for HESS is studied in this paper. The virtual resistor or virtual capacitor is extended into the control loop of each ES element to change the output impedance of the converter and then the power distribution of HESS is realized. Battery is mainly responsible for the low-frequency part of power fluctuations, and supercapacitor (SC) can quickly respond to the high-frequency part of power fluctuations. The two cooperate with each other to increase the service life of ES equipment and ensure the stable operation of the system. Finally, the correctness and effectiveness of the control strategy are verified by the simulation work in real time digital simulator (RTDS).

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隔离型直流微电网混合储能系统配电控制策略

直流微电网储能系统具有稳定母线电压和改善电能质量的功能，是直流微电网的重要组成部分。与传统的储能系统相比，电池-超级电容器混合储能系统具有更多的优点。为了充分发挥HESS的优势，实现功率的合理分配，本文对HESS的功率分配控制策略进行了研究。将虚拟电阻或虚拟电容扩展到每个ES元件的控制回路中，以改变变换器的输出阻抗，从而实现HESS的功率分配。电池主要负责功率波动的低频部分，而超级电容器(SC)可以快速响应功率波动的高频部分。两者相互配合，增加ES设备的使用寿命，保证系统的稳定运行。最后，通过实时数字模拟器(RTDS)的仿真工作，验证了控制策略的正确性和有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2021 IEEE 4th International Conference on Renewable Energy and Power Engineering (REPE)

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