基于FESS的电动汽车快速充电站能量缓冲系统

The Energy Buffer System Based on FESS for Electric Vehicle Fast Charging Station

提出一种基于飞轮储能系统(FESS)的快速充电站能量缓冲系统,一方面利用FESS代替传统电池储能系统(BESS),实现快速充电站可靠功率缓冲;另一方面,利用直流母线电压作为交互介质,提出一种分布式总线信号(DBS)控制方法,摒弃传统集中控制中的通信总线,实现了能量网和信息网的双网融合。首先建立了基于FESS的快速充电站数学模型。其次,分析了DBS控制目标、工作原理及飞轮惯量选取原则。再次,对FESS能量缓冲系统进行小信号稳定性分析。最后,搭建测试样机论证了所提方法的可行性和有效性。

A fast charging station energy buffer system is proposed based on flywheel energy storage system(FESS). On the one hand,FESS is used instead of traditional battery energy storage system (BESS)to realize reliable power buffer of fast charging station.On the other hand,the use of direct current bus voltage as an interactive medium,a distributed bus signal (DBS)control method is put forward,the traditional centralized control of the communication bus is abandoned,energy double network eonvergence of network and information network are implemented.Firstly,the mathematical model of fast charging station of FESS is established.Secondly,the principle of the control target,working and selection principle of flywheel inertia are analyzed.Thirdly,the FESS energy buffer system is analyzed for small signal stability.Finally,the feasibility and effectiveness of the proposed method are demonstrated by test prototype.