电网技术2026，Vol.50Issue(1)：312-323,中插141-中插144,16.DOI:10.13335/j.1000-3673.pst.2024.1950
基于频域无源性的LCL并网变流器解耦补偿方法
Decoupling Compensation Method for LCL-type Grid-connected Converters Based on Frequency Domain Passivity
摘要
Abstract
Under the condition of a weak grid,the interaction between grid impedance and the control loop of a grid-connected converter will easily trigger wide-frequency oscillation with frequency coupling characteristics.In view of this,this paper takes a three-phase LCL-type grid-connected converter as an example,establishes the dq admittance model of the grid-connected converter,and explores the negative impacts of the asymmetric control loop and grid voltage feed-forward on the stability of the system.Firstly,the decoupling compensation factors are introduced for the asymmetric problem of phase-locked loop and voltage outer loop.Then the compensation matrix is added to the voltage feed-forward path based on the frequency-domain passivity theory.The grid-connected converter is designed as a passive system with single input and single output.Theoretical analysis shows that the proposed method can effectively eliminate the frequency coupling characteristics of the system and control the phase of the converter's sequence admittance in the first and fourth quadrants.The system presents passive characteristics in the full frequency band,which improve the stability of the grid-connected converter under weak grid conditions.Finally,the effectiveness of the proposed approach is verified by simulations and experiments.关键词
无源性/并网变流器/弱电网/频率耦合/锁相环/电压前馈Key words
passivity/grid-connected converter/weak grid/frequency coupling/phase-locked loop/voltage feed-forward分类
信息技术与安全科学引用本文复制引用
唐欣,刘惠萃,李珍,唐凯璇,屈贝,柏翔宇..基于频域无源性的LCL并网变流器解耦补偿方法[J].电网技术,2026,50(1):312-323,中插141-中插144,16.基金项目
国家自然科学基金资助项目(52377167) （52377167）
湖南大学电能高效高质转化全国重点实验室开放基金(2024KF003).Project Supported by National Natural Science Foundation of China(52377167) （2024KF003）
Open Fund of State Key Laboratory of High-Efficiency and High-Quality Conversion for Electric Power(2024KF003). （2024KF003）
