基于实时阻抗辨识的跟网型变换器同步稳定性量化评估方法  

Quantitative evaluation method for synchronous stability of the grid following converter based on real-time impedance identification

作　　者：蒋哲 田浩 朱元振 邢法财 王延团 叶华[3] 牟倩颖 JIANG Zhe;TIAN Hao;ZHU Yuanzhen;XING Facai;WANG Yantuan;YE Hua;MU Qianying(State Grid Shandong Electric Power Research Institute,Jinan 250003,Shandong,China;Shandong Smart Grid Technology Innovation Center,Jinan 250003,Shandong,China;School of Electrical Engineering,Shandong University,Jinan 250061,Shandong,China)

机构地区：[1]国网山东省电力公司电力科学研究院,山东济南250003 [2]山东省智能电网技术创新中心,山东济南250003 [3]山东大学电气工程学院,山东济南250061

出　　处：《山东大学学报(工学版)》2024年第6期139-146,共8页Journal of Shandong University(Engineering Science)

基　　金：国网山东省电力公司科技资助项目(520626220012)。

摘　　要：针对跟网型变换器同步稳定性量化评估通常模拟电网电压跌落故障但未考虑短路故障,导致电网等效阻抗变化的问题,提出基于实时阻抗辨识的跟网型变换器同步稳定性量化评估方法。基于所建立的跟网型变换器并网系统同步稳定分析模型,说明电网等效阻抗对系统的同步稳定性有重要影响。考虑故障期间电网等效阻抗的变化,提出一种实时阻抗辨识方法,以迅速、准确地辨识出电网的等效阻抗。将实时阻抗辨识结果应用于构造的李雅普诺夫函数,对跟网型变换器的同步稳定性进行量化评估。在MATLAB/Simulink中进行仿真分析,对发生短路故障时跟网型变换器并网系统的同步稳定性进行量化评估,验证了该方法的正确性与有效性。To solve the problems that the quantitative evaluation for synchronous stability of the grid following converter was usually simulated by grid voltage sag faults,but the variation in the grid equivalent impedance caused by short circuit faults was not considered,a quantitative evaluation method for synchronous stability of the grid following converter based on real-time impedance identification was proposed.The significance of grid equivalent impedance on system stability was demonstrated using an established model for synchronous stability analysis of the grid connected system with a grid following converter.To account for variations in the grid equivalent impedance during fault conditions,a real-time impedance identification method was employed to quickly and accurately identify it.The identified impedance was then utilized to construct a Lyapunov function for quantitatively evaluating synchronous stability.Simulation analysis using MATLAB/Simulink was conducted to evaluate the synchronous stability of the grid following converter under short circuit faults,confirming both the correctness and effectiveness of the proposed method.

关 键 词：跟网型变换器 同步稳定性 阻抗辨识 等效阻抗 李雅普诺夫函数 

分 类 号：TM712[电气工程—电力系统及自动化]