Title :
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
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;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2013 IEEE
Conference_Location :
Denver, CO
DOI :
10.1109/ECCE.2013.6647299
