山东电力技术2025，Vol.52Issue(12)：70-80,11.DOI:10.20097/j.cnki.issn1007-9904.240505
基于动态电压反馈的变流器锁相同步稳定控制方法
PLL Synchronization Stability Control Scheme for Converters Based on Dynamic Voltage Feedback
摘要
Abstract
Grid-following voltage source converter(GFL-VSC)relies on phase-locked loops(PLL)to maintain synchronization with the grid.It faces the risk of PLL synchronization instability due to reducing the transmission limit during grid fault ride-through.To tackle this issue,we propose a PLL synchronization stability control scheme for converters that utilizes dynamic voltage feedback.This scheme significantly enhances the PLL synchronization stability during grid faults.Firstly,the equivalent swing equation of GFL-VSC based on PLL synchronization is established,and the internal mechanism of synchronization instability of GFL-VSC during fault ride-through is elucidated by the equal area criterion(EAC)in the existence of stable equilibrium point(SEP).Secondly,a PLL synchronization stability control scheme based on dynamic voltage feedback is constructed on this basis.This schemeslows down the acceleration process of PLL and improve the PLL synchronization stability of the converter based on the q-axis voltage feedback to adaptively adjust the d-axis current reference value during grid faults.Finally,the effectiveness of the proposed control scheme is verified by simulation and experiment.关键词
跟网型变流器/锁相环/故障穿越/等效摇摆方程/同步稳定性Key words
grid-following voltage source converter/phase-locked loop/fault ride-through/equivalent swing equation/synchronization stability分类
信息技术与安全科学引用本文复制引用
WU Naihu,MIAO Weiwei,LIU Lu,ZHOU Haiquan,SUN Lingyan..基于动态电压反馈的变流器锁相同步稳定控制方法[J].山东电力技术,2025,52(12):70-80,11.基金项目
国网山东省电力公司科技项目(520611230006).Science and Technology Project of State Grid Shandong Electric Power Company(520611230006). （520611230006）
