Discrete-time modeling and stability analysis of grid-connected inverter based on equivalent circuit

Author

Xuanlyu Wu ; Guochun Xiao ; Yong Lu ; Fengwen Chen ; Dapeng Lu

Author_Institution

Sch. of Electr. Eng., Xi´an Jiaotong Univ., Xi´an, China

fYear

2015

fDate

15-19 March 2015

Firstpage

1222

Lastpage

1226

Abstract

This paper presents a simplified discrete-time modeling and stability analysis method for digital controlled grid-connected inverters. Based on state-space average approximation, the dynamic of the original grid-connected inverter system is analyzed using the discrete-time model of the corresponding state-space average equivalent circuit. Compared to the conventional discrete-time modeling, this new approach has almost the same reliability and accuracy in stability prediction. In addition, the new model is more convenient for digital control design than the conventional discrete-time model due to its obvious simplicity. The simplified discrete-time modeling approach is validated by simulation and experiment.

Keywords

circuit stability; control system synthesis; digital control; discrete time systems; equivalent circuits; invertors; power grids; power system reliability; power system stability; state-space methods; digital control design; digital controlled grid connected inverter stability analysis method; discrete-time modeling; state-space average approximation; state-space equivalent circuit reliability; Analytical models; Digital control; Equivalent circuits; Integrated circuit modeling; Power system stability; Stability analysis; Switches; Bifurcation; Digital control; Discrete-time modeling;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2015 IEEE

Conference_Location

Charlotte, NC

Type

conf

DOI

10.1109/APEC.2015.7104503

Filename

7104503