【摘要】：伴隨著太陽能光伏發(fā)電系統(tǒng)和燃料電池等綠色清潔能源的發(fā)展和應(yīng)用,具有高增益電壓轉(zhuǎn)換功能的DC-DC變換器逐漸成為了國內(nèi)外學(xué)者們研究的熱點(diǎn)。和兩電平DC-DC變換器相比,三電平DC-DC變換器具有降低開關(guān)管、二極管電壓應(yīng)力以及減小濾波器件的尺寸等的優(yōu)勢和特點(diǎn)。同時(shí),三電平DC-DC變換器與兩電平DC-DC變換器具有相同的電壓輸出能力,并且都不能實(shí)現(xiàn)更高的電壓轉(zhuǎn)換比。為了進(jìn)一步提高受電路拓?fù)浣Y(jié)構(gòu)和功率器件所限制的DC-DC變換器的升壓能力,本文中提出了一種新型的三電平zeta變換器的拓?fù)浣Y(jié)構(gòu)。本文中所提出的新型變換器是一種帶有雙自舉耦合電感結(jié)構(gòu)單元的三電平zeta變換器。該新型三電平zeta變換器在能夠?qū)崿F(xiàn)較高的電壓增益同時(shí)具備了三電平zeta變換器的優(yōu)點(diǎn)。本文首先以傳統(tǒng)的兩電平zeta變換器為研究對象,根據(jù)三電平的電路變換思想將其變換為三電平zeta變換器,并對該電路進(jìn)行理論分析。同時(shí),通過Matlab仿真驗(yàn)證和實(shí)驗(yàn)驗(yàn)證共同證明其理論分析的正確性和電路的可行性。其次,為進(jìn)一步提升電路的電壓增益,本文中將三電平zeta變換器的電路拓?fù)浣Y(jié)構(gòu)進(jìn)行改進(jìn),依次將電感元件替換為開關(guān)電感、單自舉開關(guān)電感和雙自舉開關(guān)電感結(jié)構(gòu)單元,并對三種電路進(jìn)行了理論分析和Matlab仿真驗(yàn)證。最后,對雙自舉三電平zeta變換器進(jìn)行了實(shí)驗(yàn)驗(yàn)證,充分的證明了其具有相對較高的升壓能力。最后,為了降低占空比取值對DC-DC變換器中電壓轉(zhuǎn)換比的限制,本文中引入了耦合電感結(jié)構(gòu)單元。將開關(guān)耦合電感結(jié)構(gòu)單元替代雙自舉開關(guān)電感中的電感元件并對電路的拓?fù)浣Y(jié)構(gòu)進(jìn)行優(yōu)化和改善,最終提出了耦合電感型雙自舉三電平zeta變換器。該電路中引入了耦合電感匝數(shù)比這個(gè)變量,充分的緩解了電路中電壓增益對占空比取值的依賴。最后,通過Matlab仿真和實(shí)驗(yàn)驗(yàn)證充分的證明了該耦合電感型雙自舉三電平zeta變換器具有更強(qiáng)的升壓能力。本文中所提出的雙自舉耦合電感結(jié)構(gòu)單元同樣可以應(yīng)用到其他傳統(tǒng)類型的DC-DC變換器中,對DC-DC變換器電路實(shí)現(xiàn)高增益電壓轉(zhuǎn)換功能具有重要的指導(dǎo)意義。
[Abstract]:With the development and application of green clean energy such as solar photovoltaic power system and fuel cell, DC-DC converter with high gain and voltage conversion function has gradually become a hot research topic of scholars at home and abroad. Compared with the two-level DC-DC converter, the three-level DC-DC converter has the advantages and characteristics of reducing the switching transistor, diode voltage stress and the size of filter parts. At the same time, the three-level DC-DC converter and the two-level DC-DC converter have the same voltage output capability, and can not achieve a higher voltage conversion ratio. In order to further improve the boost capacity of DC-DC converters limited by circuit topology and power devices, a novel three-level zeta converter topology is proposed in this paper. The novel converter proposed in this paper is a three-level zeta converter with dual bootstrap inductor structure. The novel three-level zeta converter has the advantages of high voltage gain and three-level zeta converter. In this paper, the traditional two-level zeta converter is first studied, and the three-level zeta converter is transformed into a three-level zeta converter according to the idea of three-level circuit transformation, and the theoretical analysis of the circuit is carried out. At the same time, the correctness of the theoretical analysis and the feasibility of the circuit are proved by Matlab simulation and experimental verification. Secondly, in order to further enhance the voltage gain of the circuit, the topology of the three-level zeta converter is improved, and the inductance elements are replaced by the switching inductors, the single-bootstrap inductors and the dual-bootstrap inductors in turn. Three kinds of circuits are analyzed theoretically and verified by Matlab simulation. Finally, the experimental results of the dual-bootstrap three-level zeta converter show that it has relatively high boost capacity. Finally, in order to reduce the limitation of duty cycle on the voltage conversion ratio of DC-DC converter, a coupling inductor structure unit is introduced in this paper. The switch coupling inductor structure unit is used to replace the inductance element in the double bootstrap inductor, and the topology of the circuit is optimized and improved. Finally, a coupling inductive dual bootstrap three-level zeta converter is proposed. The coupling inductor turn ratio is introduced in the circuit, which fully alleviates the dependence of voltage gain on duty cycle. Finally, the Matlab simulation and experimental results show that the coupling inductance dual-bootstrap three-level zeta converter has a stronger boost capacity. The dual bootstrap inductor structure proposed in this paper can also be applied to other traditional DC-DC converters, which has important guiding significance for the realization of high gain voltage conversion function in DC-DC converter circuits.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM46

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相關(guān)期刊論文 前1條

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本文編號：2206291