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  

High-Conversion-Ratio Low-Ripple Isolated DC-DC Hydrogen Converter Based on Stacked Filter Structure

作　　者：刘海军 张理 张乔根[1] 韩民晓[3] Liu Haijun;Zhang Li;Zhang Qiaogen;Han Minxiao(School of Electrical Engineering Xi’an Jiaotong University,Xi’an 710049 China;State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co.Ltd,Beijing 102209 China;School of Electrical and Electric Engineering North China Electric Power University,Beijing 102206 China)

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]先进输电技术全国重点试验室(国网智能电网研究院有限公司),北京102209 [3]华北电力大学电气与电子工程学院,北京102206

出　　处：《电工技术学报》2024年第18期5755-5767,共13页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划项目(2020YFB1506800);国家电网公司科技项目(52110421005H)资助。

摘　　要：氢能是未来新能源电力系统中一种重要的储能方式,DC-DC制氢变换器则是连接新能源系统直流母线和电解槽的关键设备。在制氢这种大电流应用场景中,现有的大电流DC-DC变换器拓扑通常难以兼顾高效率、高电压转换比和低输出电流纹波等指标要求。为此该文提出一种基于堆叠滤波结构的DC-DC制氢变换器,该堆叠滤波结构是简单的软开关电路,具有低功耗特点,可并联于变换器输出侧有源补偿输出电流纹波,使得纹波消除不再依赖繁重的无源滤波器和高开关频率,从而提升变换器效率。此外,提出一种半波导通控制方式,该控制作用于变压器二次侧的两相交错Buck电路,可有效提高变换器的电压转换比。分别对提出的制氢变换器的拓扑原理、控制方式、参数选取和性能进行了详细的理论分析,最后通过PSIM仿真和240 W/20 A的实验样机对DC-DC制氢变换器进行了验证。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 Vin into an AC voltage.The duty cycle of the full bridge circuit is 0.5,and the switching frequency is fH.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-p

关 键 词：制氢变换器 堆叠滤波结构 隔离型DC-DC 低输出电流纹波 高电压转换比 

分 类 号：TM46[电气工程—电器]