Fuzzy Droop Control for SOC Balance and Stability Analysis of DC Microgrid with Distributed Energy Storage Systems

IF 5.7 1区工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

Journal of Modern Power Systems and Clean Energy Pub Date : 2024-01-02 DOI:10.35833/MPCE.2023.000119

Jipeng Gu;Xiaodong Yang;Youbing Zhang;Luyao Xie;Licheng Wang;Wenwei Zhou;Xiaohui Ge

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引用次数: 0

Abstract

The unbalanced state of charge (SOC) of distributed energy storage systems (DESSs) in autonomous DC microgrid causes energy storage units (ESUs) to terminate operation due to overcharge or overdischarge, which severely affects the power quality. In this paper, a fuzzy droop control for SOC balance and stability analysis of DC microgrid with DESSs is proposed to achieve SOC balance in ESUs while maintaining a stable DC bus voltage. First, the charge and discharge modes of ESUs are determined based on the power supply requirements of the DC microgrid. One-dimensional fuzzy logic is then applied to establish the relationship between SOC and the droop coefficient $R_{d}$ in the aforementioned two modes. In addition, when integrated with voltage-current double closed-loop control, SOC balance in different ESUs is realized. To improve the balance speed and precision, an exponential acceleration factor is added to the input variable of the fuzzy controller. Finally, based on the average model of converter, the system-level stability of microgrid is analyzed. MATLAB/Simulink simulation results verify the effectiveness and rationality of the proposed method.

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带分布式储能系统的直流微电网 SOC 平衡和稳定性分析的模糊下垂控制

自主直流微电网中分布式储能系统（DESS）的不平衡充电状态（SOC）会导致储能单元（ESU）因过充或过放而终止运行，严重影响电能质量。本文提出了一种带 DESSs 的直流微电网 SOC 平衡和稳定性分析的模糊下垂控制，以实现 ESU 的 SOC 平衡，同时保持稳定的直流母线电压。首先，根据直流微电网的供电要求确定 ESU 的充放电模式。然后，应用一维模糊逻辑建立上述两种模式下 SOC 与下垂系数 $R_{d}$ 之间的关系。此外，与电压-电流双闭环控制相结合，实现了不同 ESU 的 SOC 平衡。为了提高平衡速度和精度，在模糊控制器的输入变量中加入了指数加速因子。最后，基于变流器的平均模型，分析了微电网的系统级稳定性。MATLAB/Simulink 仿真结果验证了所提方法的有效性和合理性。

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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来源期刊

Journal of Modern Power Systems and Clean Energy ENGINEERING, ELECTRICAL & ELECTRONIC-

CiteScore

12.30

自引率

14.30%

发文量

审稿时长

13 weeks

期刊介绍： Journal of Modern Power Systems and Clean Energy (MPCE), commencing from June, 2013, is a newly established, peer-reviewed and quarterly published journal in English. It is the first international power engineering journal originated in mainland China. MPCE publishes original papers, short letters and review articles in the field of modern power systems with focus on smart grid technology and renewable energy integration, etc.