高增益三电平zeta变换器的研究

发布时间：2018-08-27 05:50

【摘要】：伴随着太阳能光伏发电系统和燃料电池等绿色清洁能源的发展和应用,具有高增益电压转换功能的DC-DC变换器逐渐成为了国内外学者们研究的热点。和两电平DC-DC变换器相比,三电平DC-DC变换器具有降低开关管、二极管电压应力以及减小滤波器件的尺寸等的优势和特点。同时,三电平DC-DC变换器与两电平DC-DC变换器具有相同的电压输出能力,并且都不能实现更高的电压转换比。为了进一步提高受电路拓扑结构和功率器件所限制的DC-DC变换器的升压能力,本文中提出了一种新型的三电平zeta变换器的拓扑结构。本文中所提出的新型变换器是一种带有双自举耦合电感结构单元的三电平zeta变换器。该新型三电平zeta变换器在能够实现较高的电压增益同时具备了三电平zeta变换器的优点。本文首先以传统的两电平zeta变换器为研究对象,根据三电平的电路变换思想将其变换为三电平zeta变换器,并对该电路进行理论分析。同时,通过Matlab仿真验证和实验验证共同证明其理论分析的正确性和电路的可行性。其次,为进一步提升电路的电压增益,本文中将三电平zeta变换器的电路拓扑结构进行改进,依次将电感元件替换为开关电感、单自举开关电感和双自举开关电感结构单元,并对三种电路进行了理论分析和Matlab仿真验证。最后,对双自举三电平zeta变换器进行了实验验证,充分的证明了其具有相对较高的升压能力。最后,为了降低占空比取值对DC-DC变换器中电压转换比的限制,本文中引入了耦合电感结构单元。将开关耦合电感结构单元替代双自举开关电感中的电感元件并对电路的拓扑结构进行优化和改善,最终提出了耦合电感型双自举三电平zeta变换器。该电路中引入了耦合电感匝数比这个变量,充分的缓解了电路中电压增益对占空比取值的依赖。最后,通过Matlab仿真和实验验证充分的证明了该耦合电感型双自举三电平zeta变换器具有更强的升压能力。本文中所提出的双自举耦合电感结构单元同样可以应用到其他传统类型的DC-DC变换器中,对DC-DC变换器电路实现高增益电压转换功能具有重要的指导意义。
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM46

【参考文献】