摘要
为研究新型电力系统下的次同步振荡稳定性受参数影响的敏感性问题,针对LCL型滤波器的光伏并网系统,考虑静止无功发生器(SVG)的影响,基于阻抗分析法,建立弱电网下含SVG的光伏并网系统的阻抗模型,分析在弱电网下SVG装置对系统次同步振荡影响,研究系统稳定性受参数影响的敏感性问题。由理论分析与仿真结果表明,在一定参数范围内,SVG对系统的次同步振荡具有抑制作用,且SVG电抗器参数的数值减小时会增强抑制效果;减小SVG电流环比例系数会导致SVG抑制振荡的效果变差,甚至可能引起更严重的振荡;而增大积分系数可增强SVG的抑制效果,但调整范围不宜过大;随着电网强度增大,SVG仍能产生良好的抑制次同步振荡效果,电网强度减弱时,SVG抑制振荡的效果也会减弱,但仍具有抑制能力。
In order to study the sensitivity of sub-synchronous oscillation stability affected by parameters for the new power system,the influence of static var generator(SVG)is considered for the photovoltaic grid-connected system with LCL filter.Based on the impedance analysis method,the impedance model of photovoltaic grid-connected system with SVG under weak grid is established.The influence of SVG device on sub-synchronous oscillation of system under weak grid is analyzed,and the sensitivity of system stability to parameters is studied.The theoretical analysis and simulation results show that SVG can suppress the sub-synchronous oscillation of the system within a certain parameter range,and the suppression effect will be enhanced when the parameter value of SVG reactor is reduced.In addition,reducing the proportion coefficient of SVG current loop will lead to the worse effect of SVG on suppressing oscillation,and may even cause more serious oscillation.Increasing the integral coefficient can enhance the suppression effect of SVG,but the adjustment range should not be too large.Furthermore,with the increase of power grid strength,SVG can still produce a good effect of suppressing subsynchronous oscillation.When the power grid strength is weakened,the effect of SVG on suppressing oscillation will also be weakened,but it still has the ability to suppress.
作者
文继锋
刘子俊
周专
曾维民
周袁琼
吕建国
Wen Jifeng;Liu Zijun;Zhou Zhuan;Zeng Weimin;Zhou Yuanqiong;Lyu Jianguo(NR Electric Co.,Ltd.,Nanjing 211102,China;State Grid Xinjiang Electric Power Co.,Ltd,Urumq 830011,China;School of Automation,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2024年第11期50-60,共11页
Acta Energiae Solaris Sinica
基金
国家电网公司总部科技项目(5100-202136562A-0-5-SF)。
关键词
光伏并网
弱电网
次同步振荡
LCL型滤波器
静止无功发生器
阻抗分析法
photovoltaic grid-connected
weak grid
sub-synchronous oscillation
LCL filter
static var generator
impedance analysis method
