摘要
研究的三端口DC-DC变换器可实现交错并联双向Buck-Boost电路与双有源桥电路的集成,结构简单、功率密度高,适用于光伏、燃料电池等可再生能源发电系统。采用PWM加双移相控制方式,该变换器不仅可实现3个端口间灵活的双向功率传输控制,还可保证所有开关管的软开关,减小开关损耗。研究双向Buck-Boost集成三端口变换器的基本工作原理及PWM加双移相控制策略。以光伏-蓄电池联合供电系统为例,对系统功率传输模式及不同工作情况下的功率特性和软开关条件进行深入分析。最后搭建一台350 W的实验样机,实验验证理论分析的正确性及控制方案的有效性。
The investigated three-port DC-DC converter is a combination of two interleaved Buck-Boost converters and a dual active bridge converter, which features simple structure and high power density. Therefore, it is suitable for renewable energy generation systems, such as PV, fuel cell and so on. The PWM plus dual phase shift control is employed for the three-port converter. Thus, not only the fixable power flow between any two ports, but also the softswitching conditions are easily achieved. The basic operation principle and the PWM plus dual phase shift control strategy are first analyzed. Then the PV and battery hybrid power supply system is taken as an example to explore the power transferring modes, and the output power and soft-switching characteristics under different operation conditions. Finally, a prototype with rated power 350 W is built to validate the correctness of theoretical analysis and feasibility of the proposed control scheme.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2016年第5期1180-1189,共10页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51077112)
河北省自然科学基金(13211907D-2
E2015203407)
关键词
可再生能源发电系统
三端口变换器
PWM加双移相控制
软开关
renewable energy generation systems
three-port converters
PWM plus dual phase shift control
softswitching
