An innovative interleaved high step‐up direct current–direct current converter with switched‐inductor/capacitor–diode units for hydrogen fuel cell power system. (15th June 2021)

• Record Type: Journal Article
• Authors: Tang, Juntao; Qi, Zhidong; Shan, Liang; Ye, Weiqin; Zhao, Caohui
• Is Part Of: International journal of circuit theory and applications. Volume 49:Number 9(2021)
• Page Start: 3007
• Page End: 3030
• Publication Date: 2021-06-15
• Subjects: capacitor–diode unit -- DC–DC converters with high step‐up voltage gain -- fuel cell power generation technology -- interleaved boost topology -- switched‐inductor unit; Electric circuit analysis -- Periodicals; 621.319205
• DOI: 10.1002/cta.3082
• Languages: English
• ISSNs: 0098-9886

Abstract

Summary: As a kind of new energy power generation technology in the 21st century, hydrogen fuel cell plays an indispensable role in energy network. However, due to its characteristics of low output voltage and large fluctuation, direct current–direct current (DC–DC) converter with high step‐up voltage gain has become a key part for safe and stable operation of fuel cell. In this paper, by replacing the inductors on the input side of interleaved boost converter with switched‐inductor units (small current ripple) and adding a capacitor–diode unit with strong voltage multiplication to the output side, an innovative interleaved high step‐up DC–DC converter is proposed with high step‐up voltage gain, small inductor current, and low voltage/current stresses. In addition, working principle, steady‐state performance, device parameter design, and theoretical efficiency calculation for the entire duty cycle range (duty cycle D < 0.5 and D > 0.5) are carried out, respectively, to verify its validity and feasibility. Finally, a 150‐W experimental prototype of fuel cell front‐stage power conversion is established. When the input voltage and output current are 16 V and 1.25 A, respectively, the efficiency of the entire system can reach about 92.6%. Abstract : An innovative nonisolated DC–DC converter for hydrogen fuel cell power system composed of an interleaved structure and switched‐inductor/capacitor–diode units is put forward, which features high step‐up voltage gain, small inductor current, and low voltage/current stresses. Through an experimental prototype of fuel cell front‐stage power conversion rated at 150 W, the system efficiency can reach about 92.6% when the input voltage and output current are 16 V and 1.25 A respectively, thereby verifying its availability and high efficiency.