高压电器2025，Vol.61Issue(11)：149-161,13.DOI:10.13296/j.1001-1609.hva.2025.11.014
基于串联滞后校正PLL宽频特性的DFIG阻抗重塑方法
Impedance Reshaping Method for DFIG Based on Broadband Characteristic of a Cascaded Lagging Compensation PLL
摘要
Abstract
In view of oscillation risk,which is likely happen due to impedance mismatch of the doubly-fed induc-tion generator's(DFIG)in weak grids due to the strong coupling between phase-locked loop(PLL)and grid,an im-pedance reshaping method of DFIG based on cascaded lagging compensation wideband characteristics of PLL is pro-posed.First,by setting up the impedance model of the DFIG and analyzing its Bode diagram,it is found that consid-eration of grid impedance can accurately assess potential oscillation risk.Subsequently,in case of considering grid impedance,a series lag link is introduced to the PLL to compensate the phase margin in the oscillation-prone fre-quency band.An all-pass filter is also applied to correct the power-frequency phase shift in the DFIG,thereby en-hancing grid connection stability.Finally,for validating the effectiveness of the proposed method,a hardware-in-the-loop(HIL)platform is set up based on RT-LAB.Moreover,for increasing the efficiency of ultra-wide band imped-ance scanning,a logarithmically distributed multi-frequency parallel injection method for impedance scanning is proposed,which,compared to conventional methods,improves scanning efficiency by 47.2%.Under conditions of a low short-circuit ratio(SCR),the proposed reshaping method reduces the stator voltage THD to a range of 38%to 48.9%and the current THD to a range of 40%and 59.6%,and its harmonic suppression performance is superior to the traditional reshaping approaches.关键词
双馈风机/宽频振荡/弱电网/阻抗重塑/锁相环Key words
doubly-fed induction generator/broadband oscillation/weak grid/impedance reshape/phase-locked loop(PLL)引用本文复制引用
徐恒山,陈雷..基于串联滞后校正PLL宽频特性的DFIG阻抗重塑方法[J].高压电器,2025,61(11):149-161,13.基金项目
宁夏自然科学基金项目(2024AAC03747). Project Supported by Natural Science Foundation of Ningxia(2024AAC03747). （2024AAC03747）
