华中科技大学学报（自然科学版）2024，Vol.52Issue(7)：45-51,7.DOI:10.13245/j.hust.240716
风电并网系统次同步等幅振荡机理与特性分析
Mechanism and characteristics analysis of sub-synchronous constant amplitude oscillation in wind power grid connected systems
摘要
Abstract
In response to the formation mechanism of sub-synchronous constant amplitude oscillation in direct drive wind power grid connected systems and the impact of limiting link actions on oscillation characteristics,based on a time domain model,the phenomenon of sub-synchronous constant amplitude oscillation caused by saturation of the output limiting amplitude of the DC voltage outer loop PI regulator was replicated,with a focus on analyzing the impact of the limiting link on the dynamic characteristics of the system.Then,based on the eigenvalue analysis method,from the perspective of the physical reduction system obtained from the failure of the DC voltage loop after amplitude limiting saturation,the principle of sub-synchronous equal amplitude oscillation in the direct drive wind power grid connected system after the action of the amplitude limiting link was explained.The results indicate that the periodic saturation of the output limiting link of the direct current(DC)voltage outer loop proportional integral(PI)regulator will significantly affect the dynamic behavior of the system.During the periodic saturation process of the limiting link,the system undergoes periodic switching,and the dominant sub-synchronous oscillation mode undergoes switching.The sub-synchronous constant amplitude oscillation characteristic exhibits a coupling of divergent oscillation and attenuated oscillation,rather than the traditional constant amplitude oscillation with zero damping ratio.关键词
次同步振荡/等幅振荡/限幅环节/小信号建模/时域模型Key words
sub-synchronous oscillation/constant amplitude oscillation/limiting link/small signal modeling/time domain model分类
能源科技引用本文复制引用
王玉鹏,严干贵,杨成,岳霖..风电并网系统次同步等幅振荡机理与特性分析[J].华中科技大学学报（自然科学版）,2024,52(7):45-51,7.基金项目
新疆维吾尔自治区科技计划资助项目(2022B01016). （2022B01016）
