电力系统自动化2016，Vol.40Issue(10)：76-83,8.DOI:10.7500/AEPS20150420006
不平衡运行工况下并网逆变器的阻抗建模及稳定性分析
Impedance Modeling and Stability Analysis of Grid-connected Inverters Under Unbalanced Operation Conditions
年珩 1杨洪雨1
作者信息
- 1. 浙江大学电气工程学院，浙江省杭州市 310027
- 折叠
摘要
Abstract
As it is,the grid-connected inverter usually works under the condition of unbalanced grid voltage,unbalanced grid impedance and unbalanced filter inductance.This paper studies impedance modeling and stability analysis of grid-connected inverters under the unbalanced operation conditions.Firstly,under the conditions of unbalanced voltage at the point of common coupling and unbalanced inverter filter inductance,the relationships between the voltage imbalance component,the filter inductance and the harmonic component are derived.Then the output admittance model of the grid-connected inverter in the positive sequence and negative sequence coordinates are developed.Thus the analytical expression of the admittance matrix is obtained,and the characteristics of the positive-sequence,the negative-sequence and the coupling admittances are analyzed. Based on the generalized Nyquist stability criterion and the unbalanced admittance expression of the inverter,the stability analysing criterion of the inverter in the unbalanced situation is given.Finally,experimental results are given to verify the stability criterion.关键词
不平衡电网/并网逆变器/不平衡滤波电感/阻抗建模Key words
unbalanced grid/grid-connected inverter/unbalanced filter inductance/impedance modeling引用本文复制引用
年珩,杨洪雨..不平衡运行工况下并网逆变器的阻抗建模及稳定性分析[J].电力系统自动化,2016,40(10):76-83,8.
