摘要
超级电容能馈系统是储能式回馈系统的重要发展方向,然而超级电容器较高的器件成本限制了其推广应用。为了降低超级电容储能系统成本,本工作从拓宽超级电容工作电压范围、提升能量利用率的角度出发,论述了超级电容能馈系统中传统双向DC/DC方案存在的不足,通过对三电平电路的对比研究,提出了一种适用于超级电容能馈系统的飞跨电容型三电平电路结构,并详细分析了该电路的工作模态及其PWM控制方法,最后通过PSIM软件仿真验证了理论分析的正确性。相比于传统两电平DC/DC方案,本文提出的三电平电路结构将超级电容的工作电压范围拓宽了1倍,提高了系统能量利用率。同时,该电路可以提高系统耐压、降低输出谐波及拓扑损耗,在制动能量/势能回馈这种大功率充放电场合具有广泛的应用前景。
Supercapacitor energy feedback system is an important development direction of energy storage & feedback system. However, the high cost of supercapacitor limits its application. In order to reduce the cost of the supercapacitor energy storage system, this paper discusses the shortcomings of the traditional bi-directional DC/DC scheme in the supercapacitor energy feedback system from the perspective of broadening the working voltage range of the supercapacitor and improving the energy utilization ratio. Through the comparative study of the three-level circuit, a flying capacitor three-level circuit structure is proposed, which is suitable for the supercapacitor energy feedback system. A PWM control method is proposed for the circuit and the operating modes of the circuit is analyzed in detail.Finally, the correctness of the theoretical analysis is verified by PSIM software simulation. Compared with the traditional two-level DC/DC scheme, the three-level circuit structure proposed in this paper widens the working voltage range of the supercapacitor by 100%, and improves the energy utilization rate of the system. At the same time, the circuit can improve the system withstand voltage, reduce the output harmonic and topology loss, and has a wide application prospect in the high-power charging and discharging occasions such as braking energy & potential energy feedback.
作者
陈挺
崔文峰
邓谊柏
乔志军
阮殿波
CHEN Ting;CUI Wenfeng;DENG Yibai;QIAO Zhijun;RUAN Dianbo(CRRC Supercapacitor Energy Storage and Conservation Technology R&D Center,Ningbo CRRC New Energy Technology Co.Ltd.,Ningbo 315112,Zhejiang,China;Ningbo Jiangbei Gofront Herong Electric Co.Ltd.,Ningbo 315211,Zhejiang,China;Faculty of Mechanical Engineering&Mechanics,Ningbo University,Ningbo 315212,Zhejiang,China)
出处
《储能科学与技术》
CAS
CSCD
2020年第3期935-941,共7页
Energy Storage Science and Technology
基金
宁波市科技创新2025重大专项(2019B10045)
中国中车重点项目(2019CKB198)。
关键词
超级电容器
三电平
能馈系统
supercapacitor
three-level circuit
energy feedback system
