计及LVRT的光伏并网系统暂态稳定性分析与参数优化研究  

Transient stability analysis and parameter optimization of PV grid-connected systems considering LVRT

作　　者：陈波 张权旺 刘柳 周宁 叶钟海 苏永春 戈田平 朱晓娟[2] CHEN Bo;ZHANG Quanwang;LIU Liu;ZHOU Ning;YE Zhonghai;SU Yongchun;GE Tianping;ZHU Xiaojuan(Electric Power Research Institute,State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330096,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China;State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330096,China)

机构地区：[1]国网江西省电力有限公司电力科学研究院,江西南昌330096 [2]西南交通大学电气工程学院,四川成都610031 [3]国网江西省电力有限公司,江西南昌330096

出　　处：《电力科学与技术学报》2024年第6期162-173,共12页Journal of Electric Power Science And Technology

基　　金：国网江西省电力有限公司科技项目(521820220006)。

摘　　要：光伏并网系统在低电压穿越(low voltage ride-through,LVRT)期间若控制参数设置不当易造成自身脱网,尤其是在大规模光伏并网加剧电力系统电力电子化程度的情况下,会显著降低系统暂态稳定性水平。为提升系统暂态稳定性,首先,基于光伏并网系统电压跌落期间的运行方式,采用矢量图分析故障持续期间的系统暂态稳定特征;然后,采用单目标线性规划求解方法刻画有功电流指令在暂态稳定约束下的绝对稳定区间,并基于该区间采用几何分析法确定光伏并网系统控制参数的最优区间;最后,对江西某区域实际电网结构进行仿真分析,验证所提参数优化方法对系统暂态稳定性的提升效果。Improper setting of control parameters during low voltage ride-through(LVRT)in photovoltaic(PV)grid-connected systems can easily cause their own disconnection,especially when large-scale PV grid connection exacerbates the degree of power electronics in the power system,which can significantly reduce the transient stability of the system.To improve the transient stability of the system,firstly,based on the operating mode of the PV grid-connected system during voltage drop,vector plots are used to analyze the transient stability characteristics of the system during the duration of the fault.Secondly,the single objective linear programming method is used to describe the absolute stability interval of active current command under transient stability constraints,and based on this interval,the geometric analysis method is used to determine the optimal interval of control parameters of the PV grid-connected system.Finally,simulation analysis is conducted on the actual power grid structure of a certain region in Jiangxi Province to verify the effectiveness of the proposed parameter optimization method in improving the transient stability of the system.

关 键 词：光伏并网 暂态稳定 低电压穿越 有功电流 参数优化 

分 类 号：TM712[电气工程—电力系统及自动化]