A bidirectional DC/DC converter for hybrid energy storage system

doi:10.19799/j.cnki.2095-4239.2019.0194

Abstract

Abstract:

The energy storage technology is an effective method for solving the problem of poor power quality caused by intermittent and fluctuating power output. However, a single energy storage system has issues with low energy density or power density; therefore, a hybrid energy storage system （HESS） is extensively used to ensure the safe and stable operation of the power system. According to the structure and operational characteristics of the existing battery-supercapacitor HESS, this study proposes a bidirectional DC/DC converter for the HESS, which uses a battery as the main power supply and a supercapacitor as the auxiliary power supply. Meanwhile, the HESS includes a supercapacitor pre-charging circuit to ensure that the energy storage unit （supercapacitor） exhibits a good state of charge. The working principle and three working modes of the HESS （supercapacitor pre-charging cold stand-by mode, boost mode, and buck mode） are analyzed in detail, and the voltage conversion ratios of the boost and buck modes are determined. Further, the main waveforms are verified by building a simulation model using the MATLAB/Simulink software. The results show that the system has the advantages of low voltage stress and switching loss from switching devices, providing a high current and improved battery life. This study is helpful in promoting the application of a bidirectional DC/DC converter in the HESS and provides an experimental, theoretical, and simulation basis for the research and development of an efficient and stable hybrid energy storage technology.

Key words: hybrid energy storage system, bidirectional DC/DC converter, voltage stress, inductor current

CLC Number:

TM 46

ZHANG Baoge, ZHANG Zhen, WANG Donghao, LI Ping, RONG Yao. A bidirectional DC/DC converter for hybrid energy storage system[J]. Energy Storage Science and Technology, 2020, 9(1): 178-185.

Figures/Tables 15

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Table 1

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参数	数值
蓄电池组电压	120 V
超级电容组电压	120 V
母线侧电压	300 V
电感	9 mH
预充电电阻	6.94×10^-5Ω
输出电容	1.2 mF

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