摘要
针对高压大功率场合下的直流电压变换需求,提出了一种新型模块化DC-DC变换器。该变换器开关频率低、损耗小,内部无线圈,结构简单,采用模块化设计易于扩展,且控制方式简单,适用于电压等级高、传输容量大的直流输电场合。分别设计了单向DC-DC变换器和双向DC-DC变换器,阐述了2种变换器拓扑结构、工作原理以及控制方式,并通过对比介绍了新型变换器的优势。PSCAD/EMTDC环境下的仿真实验表明,新型DC-DC变换器可以很好地实现直流变压功能,直流电压电流波形理想。
A new-type modular DC-DC converter is proposed for the demand for high-voltage high-power DC conversion.With a lower switching frequency and smaller power loss,a simple structure without any internal transformer coil,the new converter has a simpler control mode and is easy to extend.It is suitable for the DC power transmission with a higher voltage level and larger transmission capacity. For both unidirectional and bidirectional DC-DC converters designed, a detailed description is made of the converter topology,working principles as well as control strategy.It is shown by simulation results in the PSCAD/EMTDC environment that the new type of DC-DC converter can better realize the function of the DC transformer with ideal DC voltage and current than do its counterparts.
出处
《电力系统自动化》
EI
CSCD
北大核心
2014年第4期72-78,共7页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(51177042)
国家高技术研究发展计划(863计划)资助项目(2013AA050105)~~
关键词
DC-DC变换器
拓扑结构
高压直流输电
低开关频率
DC-DC converter
topology structure
high-voltage direct current transmission
low switching frequency
