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

IF 1.9 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC IET Power Electronics 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

IET Power Electronics ENGINEERING, ELECTRICAL & ELECTRONIC-

CiteScore

5.50

自引率

10.00%

发文量

195

审稿时长

5.1 months

期刊介绍： IET Power Electronics aims to attract original research papers, short communications, review articles and power electronics related educational studies. The scope covers applications and technologies in the field of power electronics with special focus on cost-effective, efficient, power dense, environmental friendly and robust solutions, which includes: Applications: Electric drives/generators, renewable energy, industrial and consumable applications (including lighting, welding, heating, sub-sea applications, drilling and others), medical and military apparatus, utility applications, transport and space application, energy harvesting, telecommunications, energy storage management systems, home appliances. Technologies: Circuits: all type of converter topologies for low and high power applications including but not limited to: inverter, rectifier, dc/dc converter, power supplies, UPS, ac/ac converter, resonant converter, high frequency converter, hybrid converter, multilevel converter, power factor correction circuits and other advanced topologies. Components and Materials: switching devices and their control, inductors, sensors, transformers, capacitors, resistors, thermal management, filters, fuses and protection elements and other novel low-cost efficient components/materials. Control: techniques for controlling, analysing, modelling and/or simulation of power electronics circuits and complete power electronics systems. Design/Manufacturing/Testing: new multi-domain modelling, assembling and packaging technologies, advanced testing techniques. Environmental Impact: Electromagnetic Interference (EMI) reduction techniques, Electromagnetic Compatibility (EMC), limiting acoustic noise and vibration, recycling techniques, use of non-rare material. Education: teaching methods, programme and course design, use of technology in power electronics teaching, virtual laboratory and e-learning and fields within the scope of interest. Special Issues. Current Call for papers: Harmonic Mitigation Techniques and Grid Robustness in Power Electronic-Based Power Systems - https://digital-library.theiet.org/files/IET_PEL_CFP_HMTGRPEPS.pdf