电力系统自动化2025，Vol.49Issue(7)：46-56,11.DOI:10.7500/AEPS20240401001
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
摘要
Abstract
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Key words
wind turbine/switched system/low voltage ride-through/voltage oscillation/evolution mechanism/modeling引用本文复制引用
赖启平,沈沉,杨艳晨,李东晟,张隽..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[J].电力系统自动化,2025,49(7):46-56,11.基金项目
国家电网公司科技项目(4000-202214067A-1-1-ZN) （4000-202214067A-1-1-ZN）
This work is supported by State Grid Corporation of China(No.4000-202214067A-1-1-ZN). （No.4000-202214067A-1-1-ZN）
