基于堆叠滤波结构的高电压比低纹波隔离型DC-DC制氢变换器

doi:10.19595/j.cnki.1000-6753.tces.231074

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Abstract

Hydrogen energy is an important energy storage method in the future renewable energy power system, and the hydrogen converter is a key device connecting the power system and electrolyzer. The primary task of the hydrogen converter is to provide high current, low voltage DC power to facilitate hydrogen production in the electrolyzer. However, the continuous impact of the output current ripple from the hydrogen converter on the internal components of the electrolyzer leads to a shortened lifespan and reduced efficiency in hydrogen production. Consequently, design requirements for hydrogen converters in these applications typically encompass low current ripple, cost-effectiveness, high efficiency, and high voltage conversion ratio.
This paper proposes a novel high-conversion-ratio low-ripple isolated DC-DC hydrogen converter, utilizing a stacked filter structure. The Stacked Filter Structure Circuit (SFSC) is implemented in parallel with the output side of the converter to actively compensate for output current ripple, enabling zero-current ripple output regardless of the filter inductance, switching frequency, and duty cycle. The SFSC, a simple soft-switching circuit, exhibits low power consumption characteristics. To enhance the output current capability, an interleaved parallel Buck circuit is employed on the output side of the converter. This circuit employs a half-wave conduction control method, effectively improving the voltage conversion ratio of the converter without requiring additional components.
The proposed hydrogen converter topology utilizes an isolated transformer T1 with a center tap. The primary side of the transformer is connected to a full bridge circuit, converting the DC voltage V_in into an AC voltage. The duty cycle of the full bridge circuit is 0.5, and the switching frequency is f_H. The secondary side of the transformer consists of a two-phase interleaved Buck circuit and a parallel circuit with SFSC. The two-phase interleaved Buck circuit serves to further reduce the voltage and increase the output current level. The two-phase interleaved circuit adopts half-wave conduction control, meaning that S_P1 is only turned on during the conduction period of S₁, and S_P2 is only turned on during the non-conduction period of S₁. The PWM signals of S_P1 and S_P2 have the same duty cycle D_P and switching period T_P. In order to maintain current symmetry in the two-phase parallel circuit, the switching frequency f_P of S_P1 and S_P2 needs to be set as an even multiple of f_H. The SFSC is connected in parallel with the output side of the two-phase interleaved Buck circuit, which consists of only AC current with no DC component. In this circuit, C_S、S_C1、S_C2, and L_C form a loadless Boost circuit, wherein the switching transistor S_C1 replaces the traditional freewheeling diode in the circuit. By utilizing the switching action of S_C1 and the conduction of its anti-parallel diode, capacitor C_S can achieve charging and discharging, overcoming the issue of conventional Boost circuits being unable to operate under loadless conditions.

This paper provides a detailed theoretical analysis of the proposed hydrogen converter topology, control method, parameter selection, and performance. The analysis is supported by simulations and experimental prototypes. The results show that the SFSC accounts for less than 2% of the total power loss and significantly reduces the output current ripple of the hydrogen converter. By using half-wave conduction control, the voltage conversion ratio of the hydrogen converter can be increased by a factor of 4N compared to traditional full bridge converters. In future research, further modular design of the proposed hydrogen topology can be explored, aiming to build high-power multi-port hydrogen converters. Additionally, improvements can be made to the stacked filtering circuit structure and control strategies to suit modular design requirements better.

Key words： Hydrogen converter stacked filter structure isolated DC-DC low output current ripple high voltage conversion ratio

Received: 09 July 2023

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	Liu Haijun
	Zhang Li
	Zhang Qiaogen
	Han Minxiao

Cite this article:

Liu Haijun,Zhang Li,Zhang Qiaogen等. High-Conversion-Ratio Low-Ripple Isolated DC-DC Hydrogen Converter Based on Stacked Filter Structure[J]. Transactions of China Electrotechnical Society, 2024, 39(18): 5755-5767.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.231074 OR https://dgjsxb.ces-transaction.com/EN/Y2024/V39/I18/5755

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