TONG G, MIAO H, XU F W, et al.A new compound active damping strategy for LCL grid-connected inverter in weak grid[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(5):121-129.

doi:10.16186/j.cnki.1673-9787.2022020045

Received:2022/02/21

Revised:2022/03/26

Published:2023/09/25

A new compound active damping strategy for LCL grid-connected inverter in weak grid

TONG Guang, MIAO Hong, XU Fangwei, ZENG Chengbi

School of Electrical Engineering，Sichuan University，Chengdu 610065，Sichuan，China

Abstract:In order to suppress the resonance caused by LCL filter，which used in grid-connected inverter in weak grid，an active damping control strategy was proposed based on second-order filter，and the parameters were designed.The resonance could be effectively suppressed by reducing the number of high-precision sensors and considering the control delay.In order to further improve the phase margin caused by the increase of grid impedance，the advanced phase compensation was introduced to form a new composite active damping strategy，which effectively improved the stability and robustness of the inverter incorporated into the weak grid system.Finally，the strategy was verified on MATLAB/Simulink simulation platform and MWINV-9R144 three-phase bridge inverter experimental platform.The results showed that when the grid resistance was large，the new composite active damping strategy could still effectively improve the stability of the inverter system，and had strong adaptability in weak grid.

Key words:LCL filter;grid-connected inverter;active damping;weak grid;robustness

弱电网下LCL并网逆变器新型复合有源阻尼策略_童广.pdf