超级电容储能的高性能集成三端口变换器设计及仿真模拟

doi:10.19799/j.cnki.2095-4239.2020.0354

摘要/Abstract

摘要：

作为当今主要的电化学储能元件之一，超级电容因其功率密度高、工作条件限制少等优点具有广阔的发展前景。为了更好地发挥超级电容的优越特性、降低系统的成本，本工作提出一种适用于超级电容储能的集成三端口变换器。超级电容储能端口通过双向Cuk变换器与输入端口连接，既能满足超级电容宽电压工作特性带来的升降压要求，还能获得连续、纹波小的端口电流。另一方面，超级电容和输入端口均通过boost-半桥变换器与输出端口连接，并与双向Cuk变换器实现深度的元件复用，因此所需元件少、成本低。根据输入端口和输出端口之间的功率关系，所提出的集成三端口变换器共有四种不同的工作模态。在不同模态下，变换器的工作原理基本相似，仅端口电流的大小和方向将发生改变，具有良好的一致性。本文以输入端口同时向超级电容储能端口和输出端口传递能量的模态为例，详细分析了变换器的工作原理，并进一步推导出了三个端口之间的电压增益、元件的电压电流应力。最后，通过搭建仿真模型，验证了变换器工作在四种模态下的有效性。本研究有助于推动集成三端口变换器在超级电容储能系统中的应用，继而助力超级电容储能的进一步推广应用。

关键词: 超级电容, 集成三端口变换器, 双向Cuk变换器, boost-半桥变换器

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

中图分类号:

TM46

王喜亮, 崔文峰, 童克锋, 陈雪龙, 乔志军, 阮殿波. 超级电容储能的高性能集成三端口变换器设计及仿真模拟[J]. 储能科学与技术, 2021, 10(3): 1095-1102.

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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