摘要
随着风电和光伏等新能源发电系统渗透率的不断提高,电网呈现出弱电网甚至极弱电网特性,给新能源并网发电系统稳定和高效运行带来了严峻挑战。通过回顾现有典型的新能源并网逆变稳定控制策略等方面的成果,总结了电流源模式、电压源模式以及双模式控制的基本原理和研究现状,并指出基于锁相环控制的电流源模式并网虽然能够保证强电网下的系统稳定性和功率控制快速性等,但是此类控制方式在稳定性、系统电压和频率调整等方面有诸多局限,难以适应新能源发电单元高比例接入的场景。基于功率自同步控制的电压源模式控制能够为电压和频率提供支撑,更加适用于高渗透率新能源发电并网的弱电网场合;基于电网阻抗自适应的双模式控制策略则同时结合了电流源模式和电压源模式在稳定性上的优势,更加适用于高渗透率下电网阻抗大幅波动的场合。最后,对上述几种典型控制策略进行总结,并探讨了未来的研究方向。
With the increasing penetration of renewable energy generation systems such as wind power and photovoltaics,the power grid presents a weak grid or even very weak grid characteristics,which brings about serious challenges with regard to the stable and efficient operation of renewable energy grid-connected generation systems.By reviewing the current results of existing typical renewable energy grid-connected inverter stability control strategies and other aspects,the basic principles and research status of current-source mode,voltage-source mode,and dual-mode control are summarized,and the current-source mode based on phase-locked loop control can ensure system stability and power control rapidity under a strong grid,which has many limitations in terms of stability,system voltage,and frequency adjustment,and adapting to a scenario where a high proportion of renewable energy generation units are connected is difficult.Voltage-source mode control based on power self-synchronous control can provide support for voltage and frequency,and it is therefore more suitable for weak grid situations with high penetration of renewable energy generation connected to the grid.The dual-mode control strategy based on grid impedance adaptation takes advantage of both the current-source mode and voltage source mode in terms of stability,which is more applicable to the scenario of large fluctuations in grid impedance under a high penetration rate.Finally,the above-mentioned typical control strategies are summarized and discussed to determine possible future research directions.
作者
张兴
李明
郭梓暄
王继磊
韩峰
付新鑫
ZHANG Xing;LI Ming;GUO Zixuan;WANG Jilei;HAN Feng;FU Xinxin(National and Local Joint Engineering Laboratory for Renewable Energy Access to Grid Technology(Hefei University of Technology),Hefei 230009,Anhui Province,China)
出处
《全球能源互联网》
CSCD
2021年第5期506-515,共10页
Journal of Global Energy Interconnection
基金
国家自然科学基金重点项目(51937003)
国家自然科学基金委员会-国家电网公司智能电网联合基金资助项目(U1766207)。
关键词
高渗透率
新能源并网
电流源模式
电压源模式
双模式
high penetration rate
renewable energy grid connection
current-source mode
voltage source mode
dual mode
