中国电机工程学报2024，Vol.44Issue(9)：3645-3655,中插26,12.DOI:10.13334/j.0258-8013.pcsee.222475
并网逆变器整体序阻抗建模方法及其稳定性分析
Overall Sequence Impedance Model of Grid-connected Inverter and Its Stability Analysis
摘要
Abstract
In a high-proportion new energy power system,the dynamic interaction between the inverter and the grid makes the system harmonic resonance problem prominent and increasingly complex.This paper takes the three-phase balanced system as the research object,studies the overall sequence impedance modeling method of the grid-connected system considering the positive and negative sequence frequency coupling and the interaction between the inverter and the grid impedance under the abc coordinate system,so as to avoid the determinant calculation.This paper pioneers the overall impedance measurement method of the grid-connected system.Furthermore,on the basis of the overall impedance model,a frequency-domain impedance stability criterion and an oscillation frequency prediction method are proposed,which can establish the connection between the frequency-domain impedance criterion and the physical links of the grid-connected system,in order to greatly reduce the risks of misjudgment.Finally,the correctness of the overall impedance model of the system is verified by frequency sweeping through MATLAB/Simulink simulation.RTLAB hardware-in-the-loop experiments proves that it can be used to judge the stability of grid-connected systems,and has the advantage of high accuracy of resonant frequency prediction.关键词
并网逆变器/整体阻抗/阻抗建模/谐波谐振稳定/振荡频率Key words
grid-connected inverter/overall impedance/impedance modeling/harmonic resonance stability/oscillation frequency分类
信息技术与安全科学引用本文复制引用
吴旭,王伟,肖华锋,韦徵,过亮..并网逆变器整体序阻抗建模方法及其稳定性分析[J].中国电机工程学报,2024,44(9):3645-3655,中插26,12.基金项目
江苏省碳达峰碳中和科技创新专项课题(BE2022003-2). Project Supported in Part by the R&D Foundation of Jiangsu Province(BE2022003-2). （BE2022003-2）
