三電平Buck-Boost雙向變換器的仿真研究

摘要：雙向DC/DC變換器因其在提高系統(tǒng)容錯能力和降低系統(tǒng)重量等方面有重要應(yīng)用價值而受到人們廣泛重視；三電平變換器由于其低的開關(guān)管電壓應(yīng)力，應(yīng)用在高壓場合具有明顯優(yōu)勢。文中提出兩種三電平Buck-Boost雙向變換器拓?fù)浼捌浣诲e互補(bǔ)控制方案，根據(jù)占空比及電感電流的不同變換器共有9種不同的工作方式，并以輸入輸出共地式變換器在D>0.5下的三種典型工作方式為例，對該類變換器的工作原理進(jìn)行了闡述，推導(dǎo)了基本關(guān)系，通過仿真驗(yàn)證了控制方案的可行性。 敘詞：變換器；雙向；三電平；降壓-升壓變換器 Abstract：With the ability of the bi-directional power flow，the bi-directional dc/dc converter has been used extensively and the three-level converter has been attracting more and more attentions for its half voltage stress of the switches．In this paper，two three-level buck-boost bi-directional dc/dc converters and a novel interleaving control strategy for them are proposed．The kind of the three-level buck-boost bi-directional dc/dc converter has 9 different operation modes when duty cycle and inductor current are different．The operation of the three modes under the conditions that duty cycle is greater than 0.5 is detailed．Some fundamental formulas are deduced．Thus, the feasibility of this control strategy is verified and the research work covered in this paper lays a profound foundation for further research． Keyword：Converter； Bi-directional；Three-level； Buck-Boost