中国电机工程学报2024，Vol.44Issue(1)：255-268,中插21,15.DOI:10.13334/j.0258-8013.pcsee.222777
计及锁相环动态的单相并网逆变器建模及稳定性研究综述
Overview of Modeling and Stability Analysis for Single-phase Grid-connected Inverters Considering Phase-locked Loop Dynamics
摘要
Abstract
As the penetration of renewable energy increases,the grid is characterized as a weak grid or even a very weak grid with high grid impedance,and the dynamic interaction between the phase-locked loop(PLL)and grid impedance will deteriorate the low-frequency stability of the grid-following inverter.In recent years,many literatures have investigated the low-frequency oscillation problem of single-phase grid-following inverters,but there is a lack in systematic sorting and summarizing the existing results,which makes it difficult to clarify the focus of further investigations.In this paper,the existing methods for modeling and stability analysis of grid-following inverters with PLL synchronization are firstly reviewed,the mechanism of the negative resistance effect caused by PLLs on the system low-frequency stability is visually illustrated,and various existing low-frequency robustness improvement methods are systematically summarized and analyzed from the perspective of improving the current control loop and phase-locked loop.Finally,the shortcomings of the existing results in stability analysis and robustness improvement,as well as the key points and difficulties of investigation are elaborated,and the further investigation directions are pointed out.关键词
弱电网/锁相环/单相系统/跟网型逆变器/低频振荡/鲁棒性Key words
weak grid/phase-locked loop(PLL)/single-phase system/grid-following inverter/low-frequency oscillation/robustness分类
信息技术与安全科学引用本文复制引用
程成,谢少军,张晴晴,许津铭,钱强..计及锁相环动态的单相并网逆变器建模及稳定性研究综述[J].中国电机工程学报,2024,44(1):255-268,中插21,15.基金项目
国家自然科学基金项目(52277183,51877104,52277184).Project Supported by National Natural Science Foundation of China(52277183,51877104,52277184). （52277183,51877104,52277184）
