摘要
此处建立了虚拟同步逆变器(VSG)小信号模型,分析了其系统特征根的振荡频率和阻尼比,以及主要状态变量对特征根的灵敏度,指出了光伏-VSG(PV-VSG)存在高频振荡风险及其产生机理,研究发现了PV-VSG高频谐振模态主要与其电网等效连接阻抗以及逆变器网侧系统参数有关。基于现有VSG控制策略,进一步引入了虚拟阻抗算法并通过小信号模型分析了具备虚拟阻抗的PV-VSG策略对高频谐振的抑制作用,最后通过200 kW功率等级的PV-VSG样机平台对此处理论分析的正确性进行了实验验证。
A virtual synchronous generator(VSG)small signal model is established,and the oscillation frequency and damping ratio of the eigenvalue of the system are analyzed,as well as the sensitivity of the main state variables to the eigenvalue.The photovoltaic-VSG(PV-V SG)has the risk of high frequency oscillation and its mechanism are showed.PV-VSG high frequency resonant mode is mainly related to the equivalent connection impedance of power grid and the system parameters of inverter grid side is studied.Based on the existing VSG control strategy,the virtual impedance algorithm is further introduced and the suppression of PV-VSG strategy with virtual impedance on high frequency resonance is analyzed by small signal model.Finally,a 200 kW power level PV-VSG prototype platform is used to verify the correctness of the theoretical analysis.
作者
沈波
杨晓峰
赵鹏程
张存佳
SHEN Bo;YANG Xiao-feng;ZHAO Peng cheng;ZHANG Cun-jia(Huaneng Julin Pouer Generain Limied New Energy Branch,Changchun 130000,China;不详)
出处
《电力电子技术》
CSCD
北大核心
2022年第10期116-119,124,共5页
Power Electronics
基金
华能集团总部科技项目(52410682010)
关键词
虚拟同步逆变器
小信号模型
特征根
高频谐振
virtual synchronous generator
small signal model
eigenvalue
high frequency resonant
