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
程成 1谢少军 1张晴晴 2许津铭 1钱强3
作者信息
- 1. 南京航空航天大学自动化学院,江苏省 南京市 211106
- 2. 国网山东省电力公司超高压公司,山东省济南市 250000
- 3. 河海大学能源与电气学院,江苏省 南京市 211106
- 折叠
摘要
随着可再生能源渗透率的提高,电网呈现出高电网阻抗的弱电网甚至极弱电网特征,锁相环与电网阻抗交互作用将恶化跟网型逆变器低频稳定性.近年来,诸多文献针对单相跟网型逆变器中的低频振荡问题进行了研究,但缺乏对现有成果系统性地梳理和总结,难以明确进一步的研究重点.为此,该文首先梳理和评述现有计及锁相环影响的逆变器建模及稳定性分析方法,直观地阐述锁相环引起的负阻效应对系统低频稳定性的影响机制,并在此基础上,从改进电流控制环和锁相环角度,系统性地归纳和分析现有各种低频鲁棒性提高方法.最后,总结现有研究在稳定性分析及鲁棒性改进上的不足及研究关键点和难点,指出进一步的研究方向.
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引用本文复制引用
基金项目
国家自然科学基金项目(52277183)
国家自然科学基金项目(51877104)
国家自然科学基金项目(52277184)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据