A feedfoward scheme to improve system stability in grid-connected inverter with LCL filter

Author

Changyue Zou ; Bangyin Liu ; Shanxu Duan ; Rui Li

Author_Institution

State Key Lab. of Adv. Electromagn. Eng. & Technol., Huazhong Univ. of Sci. & Technol., Wuhan, China

fYear

2013

fDate

15-19 Sept. 2013

Firstpage

4476

Lastpage

4480

Abstract

This paper presents a feedforward scheme to improve system stability in grid-connected inverter with LCL filter. It is found that the delay time in feedforward path has a significant impact on system stability when the converter-side current is used for feedback control and capacitor voltage is used for feedforward control. Theoretical analysis is presented to explain the instability mechanism. A delay suppression method is then proposed to improve system stability margin. A single-phase inverter laboratory prototype is used to verify the theoretical analysis.

Keywords

delays; feedback; feedforward; invertors; power filters; stability; LCL filter; capacitor voltage; converter-side current; delay suppression method; delay time; feedback control; feedforward control; feedforward path; feedfoward scheme; grid-connected inverter; single-phase inverter laboratory prototype; system stability; Damping; Delays; Feedforward neural networks; Inverters; Power system stability; Pulse width modulation; Stability analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Congress and Exposition (ECCE), 2013 IEEE

Conference_Location

Denver, CO

Type

conf

DOI

10.1109/ECCE.2013.6647299

Filename

6647299