基于Ostrowski圆盘定理的并网逆变器系统稳定性分析  

Stability analysis of grid-connected inverter system based on Ostrowski disc theorem

作　　者：杨蕾 黄伟 郭成 张丹 向川 奚鑫泽 邢超 YANG Lei;HUANG Wei;GUO Cheng;ZHANG Dan;XIANG Chuan;XI Xinze;XING Chao(Electric Power Research Institute,Yunnan Power Grid Co.,Ltd.,Kunming 650217,China;Yunnan Power Dispatching and Control Center,Kunming 650200,China)

机构地区：[1]云南电网有限责任公司电力科学研究院,云南昆明650217 [2]云南电力调度控制中心,云南昆明650200

出　　处：《电力自动化设备》2022年第4期92-98,共7页Electric Power Automation Equipment

基　　金：南方电网重点科技项目(KJDK2018210)。

摘　　要：并网逆变器与电网之间的相互作用是影响并网系统稳定运行的因素之一,针对并网逆变器系统的稳定性问题,提出了一种并网逆变器系统稳定性的快速判定方法。首先基于阻抗分析方法得到并网逆变器系统的回率矩阵。其次基于Ostrowski圆盘定理得到回率矩阵的特征值轨迹Ostrowski带,并根据Ostrowski稳定判据判断系统稳定性。最后在MATLAB/Simulink中搭建仿真模型,并构建实验平台。仿真和实验结果表明该稳定判据能够有效判定系统是否处于稳定状态,并且可以快速估计并网逆变器系统的参数稳定域,为系统参数的选取提供判断依据。The interaction between grid-connected inverter and power grid is one of the factors that affect the stable operation of grid-connected system.Aiming at the stability of grid-connected inverter system,a fast method to determine the stability of grid-connected inverter system is proposed.Firstly,the return rate matrix of grid-connected inverter system is obtained based on impedance analysis method.Secondly,based on the Ostrowski disc theorem,the characteristic root locus Ostrowski band of the return rate matrix is obtained,and the stability of the system is judged according to the Ostrowski stability criterion.Finally,the simulation model is built in MATLAB/Simulink,and the experimental platform is built.The simulative and experimental results show that the stability criterion can effectively determine whether the system is in a stable state,and can quickly estimate the parameter stability region of grid-connected inverter system,thus providing the judgment basis for the selection of system parameters.

关 键 词：并网逆变器 阻抗分析 Ostrowski圆盘定理 回率矩阵 参数稳定域 

分 类 号：TM464[电气工程—电器] TM712