PLL Frequency Stability Enhancement under Weak Grid Considering Reactive Current Support  

作　　者：Bin Hu Ling Zhan Heng Nian Donglian Qi 

机构地区：[1]the College of Electrical Engineering,Zhejiang University,Hangzhou,China

出　　处：《CES Transactions on Electrical Machines and Systems》2025年第1期110-114,共5页中国电工技术学会电机与系统学报(英文)

基　　金：supported by the National Natural Science Foundation of China under Grant 52407069;the Science and Technology Project of Zhejiang Province under Grant 2024C01254;the China Postdoctoral Science Foundation under Grant 2024T170766 and 2024M762824。

摘　　要：The phase-locked loop(PLL)plays an essential role for synchronizing renewable power generation to the grid.However,as per the grid-code compliance for reactive current support,the PLL output frequency fluctuates significantly and exceeds the limitation,which seriously threaten the safe supply of electricity.In this paper,the underlying theoretical mechanism and dominant force behind the maximum PLL frequency deviation are revealed.Accordingly,two feasible approaches are proposed to enhance the PLL frequency stability with validations in experimental results.

关 键 词：Phase-locked loop Renewable power generation Weak grid Reactive current support 

分 类 号：TN7[电子电信—电路与系统]