多电平双向Buck/Boost变换器的研究

【作者】 刘震；

【导师】 冬雷；

【作者基本信息】 北京理工大学 ， 控制理论与控制工程， 2008， 硕士

【摘要】 本文提出了一种新颖的多电平双向Buck/Boost变换器的主电路拓扑结构及其相应的控制策略。在当今的研究领域存在着形形色色的双向DC-DC变换器与多电平变换器,它们各有各的优点但同时也存在着一定的不足之处。本文在研究了目前国内外各种多电平双向DC-DC变换器,并分析了它们的优缺点的基础上,提出了一种全新的多电平双向DC-DC变换器拓扑结构,它具有以下优点:(1)充分利用了多电平技术的优势,能够将低压开关管应用在高压场合;(2)变换器在两个方向上都能实现Buck/Boost工作模式,并且升压或降压的比例可以在较大范围内连续变化;(3)变换器由诸多基本单位构成,理论上可以推广至任意电平,而且模块化的结构易于更换;(4)本拓扑结构具有箝位电容电压自动平衡的功能,为多电平的实现提供了强有力的保障。为了验证本文所提出的多电平双向Buck/Boost变换器的可行性,分别从理论计算推导、仿真软件仿真分析以及制作实验样机等多个方面进行了研究。软件仿真结果与实验样机的工作波形充分证明了本文所做的工作取得的成果。更多还原

【Abstract】 This dissertation presents a novel multi-level bidirectional DC-DC converter topology and the relevant control strategy. After researching many kinds of existing bidirectional DC-DC converter and multi-level converter, and learning from their strong points to offset the weakness, this novel multi-level bidirectional DC-DC converter has many advantages as follows:(1)This converter makes use of the advantages of the multi-level technology so that low-voltage MOSFETs or IGBTs can be used in some relatively high-voltage fields.(2)Buck mode and boost mode can both be achieved in either direction of the converter. Few existing converters have this capability. Further more the ratio of the output voltage and the input voltage can vary in a considerable wide range.(3)This converter is made up of several basic units. Every basic unit is the same to the others, so it is very easy to extend the research achievement to four-level, five-level, and even high levels. Otherwise, the basic unit can be easily displaced if some faults occur.(4)This converter is based on a generalized multilevel converter topology with self voltage balancing, so it can easily achieve level balance automatically.To prove the feasibility of the presented multi-level bidirectional DC-DC converter topology and the relevant control strategy, some simulation research based on the simulation software PSIM is performed. And then, a prototype is made. The curves obtained by simulation and the waves of the prototype firmly prove all the research of this dissertation.更多还原