电力系统保护与控制2024，Vol.52Issue(8)：145-157,13.DOI:10.19783/j.cnki.pspc.230939
基于双二阶滤波器的LCL型并网逆变器延时补偿方法
A delay compensation method based on a biquad filter for an LCL-type grid-connected inverter
摘要
Abstract
To attenuate the LCL filter resonance peak,capacitor-current-feedback active damping is widely used in an LCL-type grid-connected inverter.Because of the adverse effect introduced by the digital control delay,the performance of capacitor-current-feedback active damping significantly deteriorates.The negative damping region appears from s/6f to s/2f.This weakens the stability and robustness of the grid-connected inverter against the grid impedance variation.A biquad filter is adopted to insert into the capacitor-current-feedback path to compensate for the phase-lag resulting from the digital control delay.The positive damping region can be expanded to s/3f,thus achieving high robustness against grid impedance variation.The proper discrete method is chosen and the system stability after compensation is analyzed.Also,a detailed close-loop parameter design procedure is presented to obtain better control performance.Finally,experimental results are provided to verify the effectiveness of the proposed method and the feasibility of the parameter design procedure.关键词
有源阻尼/并网逆变器/LCL滤波器/延时补偿/正阻尼范围/弱电网Key words
active damping/grid-connected inverter/LCL filter/delay compensation/positive damping region/weak grid引用本文复制引用
赵铁英,李俊然,高宁,田培建..基于双二阶滤波器的LCL型并网逆变器延时补偿方法[J].电力系统保护与控制,2024,52(8):145-157,13.基金项目
This work is supported by the National Natural Science Foundation of China(No.U1804143). 国家自然科学基金项目资助(U1804143) （No.U1804143）
河南理工大学博士基金项目资助(B2014-027) （B2014-027）
