摘要
一次调频与虚拟惯量控制通过改变功率外环结构,可帮助逆变电源克服调频能力弱、惯量小的缺点,近年来备受关注。逆变电源的调频与惯量功能不仅会改变其自身的频率支撑特性,也可能影响系统的低频振荡特性。目前相关研究聚焦在传统逆变电源的阻尼特性,其调频与惯量控制功能对电网机间或区域低频振荡的影响机理研究较少。该文在考虑调频与惯量控制的前提下,构建适用于电网低频振荡特性研究的逆变电源并网系统数学模型,以此为基础,分析逆变电源的调频与惯量功能对系统整体阻尼与惯量的影响,揭示逆变电源影响电网低频振荡模态的机理,并通过RT-LAB平台进行实验对理论分析进行验证。研究表明:逆变电源引入一次调频可提升近区同步机低频振荡阻尼,引入虚拟惯量可降低振荡频率,调频与惯量控制的响应速度将决定逆变电源对低频振荡的影响程度。
Primary frequency regulation and virtual inertia control can help inverter power to overcome the shortcomings of weak frequency regulation ability and small inertia by changing the structure of the outer power loop of the power, which has attracted much attention in recent years. The frequency modulation and inertia functions of the inverter power will not only change its own frequency support characteristics, but may also affect the low frequency oscillation characteristics of power system. At present, the related research focuses on the damping characteristics of traditional inverter power. However, there is little research on how its frequency modulation and inertia control functions effect low frequency oscillation between units or between regions. Based on the consideration of frequency modulation and inertia control, this paper constructed a mathematical model of the grid-connected inverter power system, which is suitable for the study of low-frequency oscillation characteristics. Based on this, the frequency damping and inertia functions of the inverter power were analyzed for the overall damping and inertia of the system. The influence of inverter power on the low-frequency oscillation mode of the power grid was revealed. Experiments were performed on the RT-LAB platform to verify the results of theoretical analysis. The result indicate that the frequency modulation and inertia control of inverter generators can influent the low-frequency oscillation damping of the nearby synchronous generators. The response speed of the frequency modulation and inertia control will determine the degree of influence of the inverter power.
作者
孙大卫
刘辉
李蕴红
张瑞芳
任怡娜
王潇
程雪坤
SUN Dawei;LIU Hui;LI Yunhong;ZHANG Ruifang;REN Yina;WANG Xiao;CHENG Xuekun(State Grid Wind-photovoltaic-energy Storage Hybrid Power Generation Technology Laboratory(North China Electric Power Research Institute Co.,Ltd.),Xicheng District,Beijing 100045,China;Department of Electrical Engineering,Tsinghua University,Haidian District,Beijing 100084,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第17期5947-5956,共10页
Proceedings of the CSEE
基金
国家电网公司科技项目(52992620000T)
关键词
逆变电源
低频振荡
一次调频
虚拟惯量
振荡机理
风火/光伏打捆系统
inverter power
low frequency oscillation
primary frequency modulation
virtual inertia
oscillation mechanism
wind-thermal/solar-thermal bundled system
