中国电机工程学报2024，Vol.44Issue(8)：3213-3223,中插23,12.DOI:10.13334/j.0258-8013.pcsee.222872
弱电网下基于导纳合成相量法的单相并网逆变器鲁棒性提升技术研究
Technical Investigation on Robustness Enhancement of Single-phase Grid-connected Inverter Based on Synthesis-admittance-phasor Scheme in Weak Grid
摘要
Abstract
For grid-connected inverter,phase-locked loop(PLL)is generally adopted to obtain the voltage phase information in order to make the grid current be synchronized with the grid voltage.In the meantime,the grid voltage feedforward scheme is usually employed to improve the grid current quality.However,both of these two factors may cause negative impacts on the stability in weak grid.This paper focuses on the single-phase LCL-type grid-connected inverter,aiming to explore the causes of instability and optimize its performance accordingly.In view of the existence of dual unstable factors,a synthesis-admittance-phasor scheme is proposed to analyze the influence mechanism.Considering the attenuation effect of the band-pass filter(BPF),the design goal of the band-pass link is determined according to the analysis results of the synthesis-admittance-phasor scheme,and the specific design process of the parameters is further given.The results show that the grid-connected inverter with the optimally designed band-pass link can still work stably even when it is against the wide grid-impedance variation.关键词
并网逆变器/锁相环/电网电压前馈/弱电网Key words
grid-connected inverter/phase-locked loop/grid voltage feedforward/weak grid分类
信息技术与安全科学引用本文复制引用
张惠丽,方天治,刘昊,吴皓,张雨..弱电网下基于导纳合成相量法的单相并网逆变器鲁棒性提升技术研究[J].中国电机工程学报,2024,44(8):3213-3223,中插23,12.基金项目
国家自然科学基金项目(52077102) （52077102）
江苏省自然科学基金项目(BK20201299). Project Supported by National Natural Science Foundation of China(52077102) （BK20201299）
Natural Science Foundation of Jiangsu Province(BK20201299). （BK20201299）
