风电机组反复低电压穿越切换系统建模及电压振荡机理分析  

Switched System Modeling for Repeated Low Voltage Ride-through of Wind Turbine and Mechanism Analysis of Voltage Oscillations

作　　者：赖启平 沈沉[1] 杨艳晨 李东晟 张隽 LAI Qiping;SHEN Chen;YANG Yanchen;LI Dongsheng;ZHANG Jun(Department of Electrical Engineering,Tsinghua University,Beijing 100084,China;State Grid Jibei Electric Power Research Institute,Beijing 100045,China)

机构地区：[1]清华大学电机工程与应用电子技术系,北京市100084 [2]国网冀北电力有限公司电力科学研究院,北京市100045

出　　处：《电力系统自动化》2025年第7期46-56,共11页Automation of Electric Power Systems

基　　金：国家电网公司科技项目(4000-202214067A-1-1-ZN)。

摘　　要：风电汇集送端电网与主网电气距离较远,缺乏同步电源支撑,呈显著弱电网特征,容易出现电压振荡现象,威胁电网安全稳定运行,其动态过程与演化机理亟待研究。文中首先通过稳态潮流计算分析了风电机组反复低电压穿越引发电压振荡的条件;然后,基于切换系统理论,考虑风电机组外部连接阻抗以及内部控制动态,建立了风电机组网侧变流器的切换系统模型;接着,代入相关参数分析了风电机组反复低电压穿越期间机端电流、电压和功率的动态演化过程,揭示了电压振荡机理;最后,通过仿真复现了风电机组并网点电压振荡现象,验证了理论分析结果的正确性,并进一步探究了影响电压振荡特征的主要因素。The wind power connected sending-end grid is electrically far away from the main grid,lacking the support of synchronous generators,which shows distinct weak grid characteristics.Therefore,the voltage oscillation phenomenon is likely to occur,threatening the safe and stable operation of power systems.Its dynamic process and evolution mechanism need to be studied urgently.First,the conditions for voltage oscillation caused by repeated low voltage ride-through of wind turbines are analyzed through steady-state power flow calculation.Then,based on the switched system theory,considering the external connection impedance and internal control dynamics of the wind turbine,a switched system model for the grid-side converter of wind turbine is established.Next,by substituting relevant parameters,the dynamic evolution process of the terminal current,voltage,and power during the repeated low voltage ride-through period of the wind turbine is analyzed,and the mechanism of voltage oscillation is revealed.Finally,the voltage oscillation phenomenon of the wind turbine at the grid-connected point is reproduced through simulation,and the correctness of theoretical analysis results is verified.Furthermore,the main factors influencing the characteristics of voltage oscillations are explored as well.

关 键 词：风电机组 切换系统 低电压穿越 电压振荡 演化机理 建模 

分 类 号：TM614[电气工程—电力系统及自动化]