Stability analysis of grid-connected converter based on interconnected system impedance modeling under unbalanced grid conditions

Author

Hongyu Yang ; Heng Nian

Author_Institution

Coll. of Electr. Eng., Zhejiang Univ., Hangzhou, China

fYear

2014

fDate

22-25 Oct. 2014

Firstpage

2631

Lastpage

2636

Abstract

This paper investigates the interconnected system impedance modeling and stability analysis of grid-connected converter under unbalanced grid conditions. The proportional integral resonant (PIR) regulator is employed to control the negative sequence current. The comparison of negative sequence current suppression capability and system stability was analyzed between traditional proportional integral (PI) and the PIR regulator. The influence of the parameters in PIR regulator is also investigated. Finally, the simulation model is developed to validate the proposed impedance-based stability analysis criterion of grid connected converter.

Keywords

PI control; electric current control; interconnected systems; power convertors; power grids; stability; PIR regulator; grid-connected converter; interconnected system impedance modeling; negative sequence current suppression capability; proportional integral resonant regulator; simulation model; stability analysis; unbalanced grid conditions; Impedance; Interconnected systems; Phase locked loops; Power system stability; Regulators; Stability criteria; PIR controller; grid-connected converter; impedance model; stability analysis; unbalanced grid;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Machines and Systems (ICEMS), 2014 17th International Conference on

Conference_Location

Hangzhou

Type

conf

DOI

10.1109/ICEMS.2014.7013945

Filename

7013945