A simple estimation method of grid-forming inverter inertia based on rate of change of frequency

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-03-04 DOI:10.1049/pel2.12656

Gang Han, Liangli Xiong, Li You, Zaixun Ling, Manjia Liu, Yibo Cui, Sheng Zhang, Zhijian Fang

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Abstract

Inertia is the core index of the estimation of power system frequency stability; a simple estimation method of grid-forming inverter inertia based on the rate of change of frequency (RoCoF) is proposed in this paper. The method records and fits the active power curve by applying RoCoF to obtain the value of the grid-forming inverter inertia, and it is simpler and higher accuracy compared to existing methods. In addition, the inertia and damping are analysed to support the system, and the relationship equation between the grid frequency slope change and the output active power is derived. Considering the theoretical analyses and influencing factors, the inertia and damping are obtained by using the method of function fitting. The test steps show the simplicity of the proposed test method. Finally, the effectiveness of the proposed method is verified in MATLAB/Simulation and two 1.575-MW parallel grid-forming electrochemical energy storage power plants.

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基于频率变化率的并网逆变器惯性简单估算方法

惯性是估算电力系统频率稳定性的核心指标，本文提出了一种基于频率变化率（RoCoF）的并网逆变器惯性简易估算方法。该方法通过应用 RoCoF 记录并拟合有功功率曲线，从而获得电网成形逆变器惯性值，与现有方法相比更简单、精度更高。此外，还分析了惯性和阻尼对系统的支撑作用，并得出了电网频率斜率变化与输出有功功率之间的关系式。考虑到理论分析和影响因素，利用函数拟合的方法得到了惯性和阻尼。测试步骤显示了所提测试方法的简便性。最后，在 MATLAB/Simulation 和两个 1.575-MW 并网型电化学储能电站中验证了所提方法的有效性。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.