考虑功率耦合特性的构网型风机频率稳定分析方法  

Frequency Stability Analysis Method of Grid-forming Wind Turbine Considering Power Coupling Characteristics

作　　者：陈思怡 苏小玲 赵正奎 陈来军[1,2] 裴玮 CHEN Siyi;SU Xiaoling;ZHAO Zhengkui;CHEN Laijun;PEI Wei(School of Energy and Electrical Engineering,Qinghai University,Xining 810016,China;Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;Institute of Electrical Engineering,Chinese Academy of Science,Beijing 100190,China)

机构地区：[1]青海大学能源与电气工程学院,西宁810016 [2]清华大学电机工程与应用电子技术系,北京100084 [3]中国科学院电工研究所,北京100190

出　　处：《电力电容器与无功补偿》2025年第2期1-8,共8页Power Capacitor & Reactive Power Compensation

基　　金：国家自然基金联合基金(U23A20648)。

摘　　要：构网型风机是提高新能源电力系统频率稳定能力的重要设备,然而构网型风机有功功率和无功功率存在功率耦合问题,导致其支撑能力下降。为分析并网阻抗比对构网型风机功率耦合特性的影响,本文建立了计及功率耦合特性的构网型风机并网小信号模型,通过奈奎斯特稳定性判据确定系统稳定裕度,分析阻抗比变化对系统动态特性的影响。研究表明,构网型风机并网阻抗比减小,其功率耦合呈非线性加深趋势,导致暂态过程振荡发散,直至风机失稳。仿真及实验结果验证了本文理论分析方法的可行性和正确性。Grid-forming wind turbine is an important equipment in improving the frequency stability of new energy power systems.However,the coupling between active and reactive power in grid-forming wind turbine reduces its support capability.In order to analyze the influence of grid-forming impedance ratio on the power coupling characteristics of the grid-forming wind turbine,a small signal model of grid-forming wind turbine considering power coupling characteristics is set up in this paper,the system stability margin is determined by using the Nyquist stability criterion,and the influence of impedance ratio variation on system dynamic characteristics is analyzed.The study shows that when the grid impedance ratio of the grid-forming wind turbine decreases,its power coupling shows nonlinear and deepening trend,causing oscillations in the transient process to diverge and eventually leading to turbine instability.The feasibility and correctness of the theoretical analysis in this paper have been verified by both simulation and experimental results.

关 键 词：构网型风机 功率耦合 并网阻抗 稳定裕度 频率稳定裕度 

分 类 号：TM614[电气工程—电力系统及自动化]