现代电子技术2024，Vol.47Issue(15)：139-145,7.DOI:10.16652/j.issn.1004-373x.2024.15.023
三相LCL-LC型仅网侧反馈的改进时滞抑制
Improved time delay suppression in three-phase LCL-LC rid-connected inverters with only grid-side feedback
摘要
Abstract
The active damping(AD)of LCL-LC voltage source inverter with only grid-side current feedback reduces the use of detection components in comparison with the AD with capacitor current feedback,which can effectively suppress resonance peaks generated by LCL-LC inverters.However,due to the control delay effects of digital circuits,variations of grid impedance will cause the shift of resonance frequency(fr).When fr is near 1/6 of the sampling frequency(fs),the system becomes unstable.To eliminate the impact of control delay on the inverters when LCL-LC AD inverters only have grid-side feedback,the influence of changes of grid impedance on system stability in the digital domain is studied,and a novel delay compensation method,that is,an improved delay compensation is added to the feedforward path of the control loop,is proposed.In this method,the equivalent positive resistance of AD is extended from the fs/6(the original)to 0.496 5fs.Because of the compensation of widening the equivalent positive resistance,the system remains stable around fs/6 even when fr shifts,which enhances system stability greatly.Simulation and experimental results validate the theoretical correctness of the method.关键词
LCL-LC/有源阻尼/逆变器/时滞抑制/谐振偏移/延时补偿Key words
LCL-LC/AD/inverter/time delay suppression/resonance offset/delay compensation分类
信息技术与安全科学引用本文复制引用
李小宝,梁登辉,周维龙,周红,龙欢,柳骏涛..三相LCL-LC型仅网侧反馈的改进时滞抑制[J].现代电子技术,2024,47(15):139-145,7.基金项目
国家自然科学基金面上项目(51977072) （51977072）
