中国电机工程学报2024，Vol.44Issue(7)：2815-2824,后插24,11.DOI:10.13334/j.0258-8013.pcsee.223356
功率耦合和电流限幅影响下构网型变流器的暂态同步稳定分析
Transient Synchronization Stability Analysis of Grid-forming Converter Influenced by Power-coupling and Current-limiting
摘要
Abstract
In the grid-forming(GFM)converter with the limiting output current,power-coupling between active and reactive loops and current-limiting between voltage and current loops can significantly affect the synchronous process of the converter with power grid.Therefore,this paper studies the transient synchronization stability of GFM converters influenced by power-coupling and current-limiting.First,considering these two factors,the reduced-order model of the converter is established.Then,an energy function,containing three state variables(power angle,frequency and voltage)of the GFM control,is constructed.Based on Lasalle's theory,the domain of attraction of the converter and its corresponding transient stability margins are obtained.The analysis results reveal that power-coupling and current-limiting deteriorate the transient synchronization stability of the converter by affecting the distribution of potential energy and damping,respectively.Thus,based on virtual impedance and power decoupling,an optimized strategy for GFM control is proposed to suppress these negative effects from power-coupling and current-limiting.Finally,simulation and experimental results verify the correctness of the above theoretical analysis.关键词
构网型变流器/暂态同步稳定性/功率耦合/电流限幅Key words
grid forming converter/transient synchronization stability/power-coupling/current-limiting分类
信息技术与安全科学引用本文复制引用
付熙坤,黄萌,凌扬坚,田震,查晓明..功率耦合和电流限幅影响下构网型变流器的暂态同步稳定分析[J].中国电机工程学报,2024,44(7):2815-2824,后插24,11.基金项目
国家重点研发计划项目(2022YFB2402700) （2022YFB2402700）
国家电网公司科技项目(52272222001J).National Key R&D Program of China(2022YFB2402700) （52272222001J）
Science and Technology Project of State Grid Corporation of China(52272222001J). （52272222001J）
