Transient Stability Analysis and Control of Grid-forming Converter Considering Virtual Impedance Power Decoupling

被引：0
|
作者：
Meng, Xiaoxiao [1 ]
Wang, Yuchen [1 ]
Mao, Xun [2 ]
Xie, Bao [1 ]
Shao, Bingbing [1 ]
机构：
[1] Anhui Province Key Laboratory of Renewable Energy Utilization and Energy Saving, Hefei University of Technology, Hefei
[2] State Grid Anhui Electric Power Research Institute, Hefei
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2024年 / 48卷 / 24期
基金：
中国国家自然科学基金;
关键词：
current limiting control; energy function; grid-forming converter; power coupling; transient stability; virtual impedance; virtual synchronous generator;
D O I：
10.7500/AEPS20240304001
中图分类号：
学科分类号：
摘要：
The virtual impedance control is helpful in reducing the power coupling problem of grid-forming converters caused by resistive lines. It can also be activated to play the role of current limitation in the case of grid fault. The introduction of virtual impedance profoundly affects the transient synchronous stability of grid-forming converters under large disturbances of faults. At present, there is no stable quantitative analysis method for these effects. Therefore, this paper establishes the classical third-order reduced-order dynamic model for the grid-connected system of grid-forming converters with virtual impedance control. Then, an improved energy function considering virtual impedance power decoupling is constructed based on the LaSalle’s invariance principle. The analysis shows that the improved energy function can evaluate the effect of the virtual impedance parameters on the transient stability by quantifying the attraction domain. Based on this, this paper proposes a transient stability optimal control strategy of grid-forming converters considering the virtual impedance power decoupling to improve the transient synchronous stability of grid-forming converters. Finally, the simulation and experimental results verify the effectiveness of the proposed optimal control strategy. © 2024 Automation of Electric Power Systems Press. All rights reserved.
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页码：101 / 111
页数：10
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