Research on the application of flying capacitor three-level circuit in supercapacitor energy feedback system

doi:10.19799/j.cnki.2095-4239.2020.0073

Abstract

Abstract:

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.

Key words: supercapacitor, three-level circuit, energy feedback system

CLC Number:

TM 910.6

CHEN Ting, CUI Wenfeng, DENG Yibai, QIAO Zhijun, RUAN Dianbo. Research on the application of flying capacitor three-level circuit in supercapacitor energy feedback system[J]. Energy Storage Science and Technology, 2020, 9(3): 935-941.

Figures/Tables 14

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参数	取值
直流母线放电电压阈值/V	700
直流母线吸电电压阈值/V	800
超级电容容量/F	12.5
超级电容额定电压/V	600
超级电容工作电压范围/V	150～600
低压模式的超级电容电压/V	200
高压模式的超级电容电压/V	450
超级电容额定电流/A	200
输出滤波电感L₁/mH	0.5
直流母线电容C₁/μF	3000
飞跨电容C_pv/μF	1000
功率开关工作频率/Hz	2000

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