摘要
随着直流配用电技术的发展,直流变压器技术开始备受关注,其效率和功率密度是目前主要的技术难题,为此需要从电力电子功率变换拓扑角度出发研究多工况、宽电压范围适用的高频、高效软开关拓扑。文中提出了一种可变结构多模式运行的隔离型多谐振直流变换器。该变换器采用辅助开关控制谐振腔,从而在不同应用场景下表现出自适应谐振特性。当系统输入电压较低时,采用双变压器多谐振拓扑结构,以获得较高的电压增益;而在额定状态下则采用五元件多谐振拓扑结构运行,实现高效率。得益于变结构多模式运行拓扑结构,该变换器具有较宽的电压增益范围,并能够始终保持较高的效率。这些特点使该变换器非常适合应用于直流配用电系统。文中在电路特性分析的基础上,制作样机并完成了实验验证。输入电压范围为80~600V,输出电压为400V,变换器峰值效率达到97.5%。
With the development of DC power distribution technology,DC transformer has attracted enough attention.Its efficiency and power density are the main technical problems at present.Therefore,based on the power electronic power conversion topology,it is necessary to study high frequency and soft switching topology suitable for multioperating and wide voltage range conditions.In this paper,an isolated multi-resonant DC/DC converter based on variable structures and multi-mode operations is proposed.The converter uses auxiliary switches to control the resonant tank for exhibiting adaptive resonance characteristics in different application scenarios.When high voltage gain is needed,the dual transformer multi-resonance converter(MRC)topology is adopted,while a five-element MRC topology is required in rated state to achieve high efficiency.Thanks to the variable structure multi-mode operation topology,the converter has a wide voltage gain range and always maintains a high efficiency.These characteristics make the converter very suitable for DC distribution system applications.Finally,the performance of the prototype is tested.The input voltage is from 80 V to 600 V,and the output voltage stays 400 V constantly.The peak efficiency is 97.5%in the whole gain range.
作者
赵宝国
李国栋
侯宇琦
韩富强
李占纯
ZHAO Baoguo;LI Guodong;HOU Yuqi;HAN Fuqiang;LI Zhanchun(State Grid Tianjin Chengxi Electric Power Supply Company,Tianjin 300190,China;State Grid Tianjin Electric Power Company,Tianjin 300384,China;Key Laboratory of Smart Grid of Ministry of Education Tianjin University,Tianjin 300072,China)
出处
《高压电器》
CAS
CSCD
北大核心
2019年第9期34-41,共8页
High Voltage Apparatus
关键词
多谐振变换器
拓扑变换
变拓扑
高效率
高次谐波
multi-resonant converter
topological transformation
variable topology
high efficiency
high-order harmonics
