摘要
电动车棚充电系统中的多功率因数矫正(power factor correction,PFC)变换器可能引起系统出现高幅度周期性阻尼震荡,严重时危及系统稳定运行。对此,结合阻抗建模对PFC变换器进行综合分析,探讨变换器台数对系统稳定性的影响。以多PFC连接系统为研究对象建立多PFC变换器阻抗模型,采用奈奎斯特稳定性判据,从接入系统变换器数量和系统源阻抗大小两方面研究多PFC连接系统稳定性变化规律。运用Simulink仿真平台搭建多PFC变换器并联接入电动车棚充电系统仿真模型,验证理论分析的有效性。仿真结果表明,随着变换器数量增加,系统总电流畸变程度增加,伴随源阻抗变化,畸变程度进一步加剧增至原有的70%。面对多PFC连接系统,系统谐波震荡水平与PFC变换器数量呈正相关,伴随源阻抗的改变,谐波震荡水平将进一步加剧。
The existence of multiple power factor correction(PFC)converter in the charging system of the elec⁃tric shed will lead to high amplitude periodic damping oscillation,which will endanger the stable operation of the system.The influence of the number of converters on the stability of the PFC converter is discussed.The im⁃pedance model of multi-PFC converter is established based on the Nyquist stability criterion.The stability of multi-PFC converter is studied from two aspects:the number of converters in the access system and the source impedance of the system.Simulink simulation platform is used to build a simulation model of multi-PFC con⁃verters connected in parallel to the charging system of the electric vehicle shed to verify the validity of the theo⁃retical analysis.The simulation results show that with the increase of the number of converters,the total cur⁃rent distortion degree increases,and with the change of source impedance,the distortion degree further increas⁃es to 70%of the original.For multi-PFC connected systems,the harmonic oscillation level of the system is positively correlated with the number of PFC converters,and the harmonic oscillation level will be further aggra⁃vated with the change of source impedance.
作者
马晓妍
代红
何奇
范李平
马辉
MA Xiaoyan;DAI Hong;HE Qi;FAN Liping;MA Hui(College of Electrical Engineering&New Energy,China Three Gorges University,Yichang 443002,China;State Grid Yichang Power Supply Company,Yichang 443000,China)
出处
《电力学报》
2024年第1期1-10,共10页
Journal of Electric Power
基金
国家自然科学基金项目(52377191)
国家电网湖北省电力科技项目(202100785)。
关键词
功率因数校正变换器
谐波电流
阻抗模型
稳定性分析
power factor correction converter
harmonic current
impedance model
stability analysis
