摘要
DC/DC变换器是建筑光伏系统的重要组成部分,主要功能包括升压、最大功率跟踪和电力载波等,文中重点研究DC/DC变换器的升压能力。利用开关电容电感技术对准Z源升压型DC/DC变换器进行改进,得到一种改进型准Z源DC/DC变换器,其升压能力增强,电容电压应力降低。该变换器在占空比小的情况下可实现高增益升压;当电压增益相同时,改进型Z源DC/DC变换器比传统Z源变换器开关管导通时间短,更有利于开关管的散热,延长开关器件的使用寿命。文中先分析改进型准Z源升压型DC/DC变换器拓扑的推演过程,详细分析其工作原理,分析变换器增益特性和电容电压应力特性,在理论研究的基础上,仿真和实验结果验证了新型变换器的优点。
DC/DC converter is an important component of building photovoltaic system. Its functions include boosting, maximum power point tracking and power line carrier. The boosting capacity of DC/DC converter is researched emphatically in this paper. An improved quasi Z-source DC/DC converter with higher boosting capability and lower capacitor voltage stress is obtained by means of switched capacitor inductor technology. The improved Z-source DC/DC converter can achieve high voltage gain under the circumstance of small duty ratio. When the voltage gain is same,the switching on time of the improved Z-source DC/DC converter is shorter than that of the traditional Z-source converter,which is more conducive to the heat dissipation and prolongs the service life of the switching devices. The topology deduction process,working principle,gain characteristics and capacitor voltage stress characteristics of the improved quasi-Z-source DC/DC boost converter are analyzed in detail. On the basis of theoretical research,the advantages of the new converter are verified by simulation and experimental results.
作者
张巧杰
ZHANG Qiaojie(College of Automation,Beijing Information Science and Technology University,Beijing 100192,China)
出处
《现代电子技术》
北大核心
2019年第17期100-105,108,共7页
Modern Electronics Technique
基金
国家自然科学基金项目(51477011)
北京市青年拔尖人才培育计划项目(CIT&TCD201804053)
关键词
建筑光伏系统
DC/DC变换器
开关电感-电容
高增益升压
占空比
散热
building photovoltaic system
DC/DC converter
switched capacitor inductor
high voltage gain boost
duty ratio
heat dissipation
作者简介
张巧杰(1978—),女,博士,副教授,主要从事电力电子技术方面的研究。
