Design and simulation of an integrated three-port converter for supercapacitor energy storage

doi:10.19799/j.cnki.2095-4239.2020.0354

Abstract

Abstract:

Among the popular electrochemical energy storage components, supercapacitors are attractive in engineering applications because of their favorable characteristics of high power density and less working limitations. An integrated three-port converter is proposed in this paper to give full play to the supercapacitor and reduce the overall cost. On the one hand, the supercapacitor energy storage port is connected to the input port through a bidirectional Cuk converter, which can meet the voltage fluctuation requirements brought by the wide voltage operation characteristics of the supercapacitor and obtain continuous and small ripple port current. On the other hand, both the supercapacitor and the input port are connected to the output port through the boost-half-bridge converter. Because the components used in the boost-half-bridge converter are well multiplexed with the bidirectional Cuk converter, fewer components are required, contributing to lower cost. According to the power relationship between the input and output ports, the proposed integrated three-port converter has four operating modes. In these modes, the working principle of the proposed converter is basically similar, except for the value and direction of the port current, which has a good consistency. In this paper, the operation principle of the converter is analyzed in detail, and voltage gain between the three ports and voltage/current stresses of the components are derived. Finally, a simulation model is built to verify the effectiveness of the proposed converter working in four modes. This study helps promote the application of integrated three-port converters in supercapacitor energy storage systems, which may be further popularized.

Key words: supercapacitor, integrated three-port converter, bidirectional Cuk converter, boost-half-bridge converter

CLC Number:

TM46

Xiliang WANG, Wenfeng CUI, Kefeng TONG, Xuelong CHEN, Zhijun QIAO, Dianbo RUAN. Design and simulation of an integrated three-port converter for supercapacitor energy storage[J]. Energy Storage Science and Technology, 2021, 10(3): 1095-1102.

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项目	参数名称	数值
主参数	超级电容储能端口电压V_sc	300 V～500 V
	输入端口电压V_i	400 V
	输出负载端口电压V_o/电流I_o	100 V/16 A
设计参数	变压器匝比N_p∶N_S1∶N_S2	13∶6∶6
	电感L_i	1200 μH
	电感L_sc	1000 μH
	电感L_o	100 μH
	电容C₁	10 μF
	电容C_b	10 μF
	电容C_o	470 μF

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