Interleaved high step-down DC/DC converter for hydrogen production based on coupling inductor

doi:10.3969/j.issn.2097-0706.2022.06.008

Abstract

Abstract:

Water electrolysis hydrogen production powered by photovoltaic energy is a low-cost and clean hydrogen production way that can generate high-purity hydrogen and alleviate the environmental pressure. DC/DC converters can flexibly match the I-V curves of photovoltaic arrays and electrolytic cells, so as to improve the efficiency of a photovoltaic hydrogen production system. A new interleaved Buck circuit of coupled inductor is proposed to solve the low step-down ratio of traditional step-down converters and excessive voltage stress of power devices.Selecting appropriate turn ratio for the coupling inductor can prolong the duty cycle of the circuit and lower the conversion ratio. The interleaving technology and component rearrangement can alleviate the voltage stress of power devices,so as to achieve a high step-down ratio and improve the efficiency of the converter simultaneously. In practical cases,the proposed method can improve the efficiency of hydrogen production systems and facilitate the development of clean energy. Based on the circuit simulation and experiments, the operating principle and performance analysis on the converter are verified.

Key words: photovoltaic hydrogen production system, high step-down DC/DC converter, coupling inductor, interleaving technology, low voltage stress, hydrogen production from water electrolysis, carbon neutrality

CLC Number:

TK01：TM46

ZHOU Liying, WANG Yurong, WANG Qingyan. Interleaved high step-down DC/DC converter for hydrogen production based on coupling inductor[J]. Integrated Intelligent Energy, 2022, 44(6): 70-77.

Figures/Tables 13

Fig.1

Fig.2

Fig.3

Fig.4

Table 1

Performance of converters

项目	文献[9]	文献[11]	文献[12]	文献[16]	本文
增益	$D 2 - D$	$D (1 - D) n + D (1 - D)$	$D 2 - D$	$D 2$	$D 2 - D + 2 n (1 - D)$
最大开关管电压应力	$V i n 2 - D$	$V i n - V o$	$V i n 2 - D$	$V i n$	$D n + (n + 2) (1 + n D - n) (n + 1) (2 - D + 2 n - 2 n D) V i n$
最大二极管电压应力	$1 + n (1 - D) 2 - D V i n$	$(1 - D) V i n n + D (1 - D)$	$V i n 2 - D$	$V i n + V r i n g$	$1 + n (1 - D) 2 - D + 2 n (1 - D) V i n$
效率/%	94.9	92.9	96.0	94.0	96.5

Table 1

Fig.5

Fig.6

Table 2

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

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参数	数值
输入电压V_in/V	400
输出电压V_o/V	24
输出功率P_o/W	120
开关频率f_s/kHz	50
输出电容C_o/μF	47
钳位电容C₁,C₂,C₃,C₄/μF	10
电感L₁,L₂/μH	400
匝比	2