标题：Improved discrete-time model of digital controlled three-phase grid-connected inverter [数字控制三相并网逆变器改进离散模型]
作者：Cao, Na ;Li, Wenqiang ;Yu, Qun
作者机构：[Cao, Na ;Li, Wenqiang ;Yu, Qun ] College of Electrical Engineering and Automation Shandong University of Science and Technology, Qingdao; 266590, Chi 更多
通讯作者地址：[Cao, N] College of Electrical Engineering and Automation Shandong University of Science and TechnologyChina;
来源：Taiyangneng Xuebao/Acta Energiae Solaris Sinica
关键词：Bifurcation(mathematics); Digital control systems; Discrete-time model; Electric inverter; Space vector pulse width modulation; Stability; State space averaging model; State space methods
摘要：Taking double closed-loop control three-phase grid-connected inverters as the research subject, considering the sampling calculation delay caused by digital control system, an improved discrete-time model based on SVPWM (Space Vector Pulse Width Modulation) state space averaging model is established. Meanwhile the modeling method is improved, so that it can be used for the irreversible situation of the state variable coefficient matrix. Then the characteristic polynomial of Jacobian matrix of discrete model is judged according to July stability criterion, the stability region of two-parameter system is obtained, and the bifurcation diagrams of different parameters are drawn. Finally, the digital control three-phase grid-connected inverters model is built on the simulation platform of Matlab/Simulink, and the stability region and the correctness of the model are verified by comparing with the fold diagram obtained by programming iteration. © 2020, Editorial Board of Acta Energiae Solaris Sinica. All right reserved.