摘要
虚拟同步机(VSG)与串联补偿电网之间的阻抗存在交互,类似于同步发电机(SG)的连接串联补偿电网的次同步谐振现象,从而发生低频振荡。因此,针对在低频段串联补偿电网下VSG的次同步振荡(SSO)问题,本文提出一种基于VSG惯量阻尼协同控制的SSO抑制策略。在VSG的转动惯量和虚拟阻尼环节的反馈支路中添加阻抗重塑控制器,实现惯量阻尼共同抑制振荡,在系统运行方式改变时,抑制了SSO,增强系统稳定性。实验结果与阻抗波特图结果相一致,验证了所提方法的可行性和正确性。
Similar to the subsynchronous resonance problem of the series-compensated grid-connected system based on synchronous generator(SG),virtual synchronous generator(VSG)also has the low-frequency oscillation problem due to the impedance interaction between VSG and the series capacitor compensation power grid.Therefore,a VSG subsynchro⁃nous oscillation(SSO)suppression strategy based on inertia and damping cooperative control is proposed to suppress this SSO in the low frequency band,which introduces impedance reshaping controllers into the feedback loops of VSG’s rotational inertia and virtual damping,and restrain the oscillation with inertia and damping working jointly.The proposed method is applied to restrain subsynchronous oscillation to enhance system stability after the changes in the operation of power system.The experimental results are consistent with the impedance Bode diagram results,demonstrating the feasi⁃bility and correctness of the proposed method.
作者
凌率
刘瑞煌
王鑫达
杨兴武
Ling Shuai;Liu Ruihuang;Wang Xinda;Yang Xingwu(College of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;Electric Power Science Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103,China)
出处
《电力电子技术》
2025年第7期113-118,共6页
Power Electronics
基金
上海市科技项目(23DZ1201206)。
关键词
虚拟同步机
阻抗重塑
次同步振荡
协同控制
virtual synchronous generator
impedance reshaping
subsynchronous oscillation
cooperative control
