Modeling and Stability Analysis of DC Microgrid with Photovoltaic and Energy Storage System

2021 IEEE Southern Power Electronics Conference (SPEC) Pub Date : 2021-12-06 DOI:10.1109/SPEC52827.2021.9709489

Fang Liu, Haodong Wang, Zi Wu, Hao Li, Yang Zhao, Chunyang Ling

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Abstract

The DC microgrid with photovoltaic and energy storage system has become a prevailing trend for new energy. However, the whole system involves a variety of power electronic converter interactions, so it is necessary to conduct system stability analysis. Firstly, the topology and control strategies of the DC microgrid with photovoltaic and energy storage system are introduced, including photovoltaic power generation system and its control, energy storage system and its control, and grid and grid-side converter topology and its control. Secondly, the impedance or admittance of these three units are modeled separately. Next, each unit is equivalent into the corresponding voltage source system or current source system, and the impedance proportion of the DC microgrid with photovoltaic and energy storage system is obtained. Then based on the Nyquist stability criterion, the obtained impedance proportion is used to analyze the impacts of the proportional parameters of the voltage loop of the grid-side converter, the control parameters of the current loop of the energy storage system, as well as the capacity of the energy storage system and the charging and discharging states of the energy storage on the stability of the DC microgrid with photovoltaic and energy storage system.

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光伏储能直流微电网建模与稳定性分析

结合光伏和储能系统的直流微电网已成为新能源发展的主流趋势。然而，整个系统涉及到各种电力电子变换器的相互作用，因此有必要对系统进行稳定性分析。首先，介绍了具有光伏和储能系统的直流微电网的拓扑结构和控制策略，包括光伏发电系统及其控制、储能系统及其控制、电网和电网侧变流器拓扑结构及其控制。其次，分别对这三个单元的阻抗或导纳进行建模。然后将各单元等效成相应的电压源系统或电流源系统，得到直流微电网与光伏、储能系统的阻抗比例。然后基于Nyquist稳定性判据，利用得到的阻抗比例，分析了电网侧变换器电压回路比例参数、储能系统电流回路控制参数以及储能系统容量和储能系统充放电状态对光伏储能直流微网稳定性的影响。

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 Southern Power Electronics Conference (SPEC)

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