高增益比双向直流变换器研究

发布时间：2018-06-01 21:50

本文选题：双向变换器 + 高增益比　；参考：《南京航空航天大学》2016年硕士论文

【摘要】：双向直流变换器是实现能量双向传输的重要装置,在分布式储能系统中应用较为广泛,用于实现蓄电池和高压母线之间能量的高效双向传输。由于蓄电池端电压一般较低且变化范围较宽,高压母线电压通常又较高,这就要求双向直流变换器具备高电压增益变换、宽电压范围调节的能力,给研究高效传输的双向变换器带来了巨大的挑战。本文首先研究可以实现高电压增益变换、宽电压范围调节的双向变换器拓扑,通过结合非隔离型双向Buck/Boost变换器的宽电压调节能力和隔离型半桥式双向直流变换器的高增益变换能力,得到本文研究的非隔离型高增益比双向直流变换器拓扑。文中首先研究该变换器拓扑在移相控制下的工作原理和特性,针对软开关范围窄、电流纹波大等缺点进一步优化控制策略引入占空比调节,文中详细分析了该变换器在PWM加移相控制下的工作原理和特性,并搭建了1kW双向变换器样机进行了充分的实验验证,理论分析和实验表明:该变换器在PWM加移相控制下不仅能够实现全范围软开关,而且绕组电流有效值和开关管电流应力都得到了大幅降低。本文进一步引入电感-变压器的复用-集成概念,将前文变换器拓扑中的能量传输电感和变压器进行磁集成,得到本文研究的耦合电感式高增益比双向直流变换器拓扑。该变换器同样采用PWM加移相控制,在提高功率密度的同时依然可以实现高效的能量双向传输,文中详细分析了变换器的工作原理、特性并对关键参数设计进行了详细分析,最后搭建了40V-60V/400V 1kW实验样机进行验证,实验结果证明了理论分析的正确性。
[Abstract]:Bi-directional DC / DC converter is an important device to realize bidirectional energy transmission. It is widely used in distributed energy storage system. It is used to realize high efficiency bidirectional energy transmission between battery and high-voltage bus. Because the voltage of battery terminal is generally lower and the range of variation is wider, the voltage of high voltage bus is usually higher, which requires the ability of high voltage gain conversion and wide voltage range adjustment of bidirectional DC / DC converter. It brings great challenges to the research of high efficiency bidirectional converters. In this paper, we first study the bidirectional converter topology which can realize high voltage gain conversion and wide voltage range adjustment. By combining the wide voltage regulation ability of the non-isolated bidirectional Buck/Boost converter and the high gain conversion ability of the isolated half-bridge bidirectional DC / DC converter, the topology of the non-isolated high gain ratio bi-directional DC / DC converter studied in this paper is obtained. In this paper, the working principle and characteristics of the converter topology under phase-shift control are studied firstly, and the duty cycle adjustment is introduced to optimize the control strategy in view of the disadvantages of narrow soft switching range and large current ripple. The principle and characteristics of the converter under the PWM phase-shift control are analyzed in detail, and the prototype of the 1kW bi-directional converter is built for full experimental verification. Theoretical analysis and experiments show that the converter can not only achieve a full range of soft switching under PWM phase-shift control, but also greatly reduce the effective value of winding current and the current stress of the switch tube. In this paper, the concept of multiplexe-integration of inductance transformer is further introduced, and the energy transfer inductor and transformer in the former converter topology are integrated into each other, and the coupling inductance high gain ratio bi-directional DC / DC converter topology studied in this paper is obtained. The converter also adopts PWM phase-shift control, which can achieve high efficiency bidirectional energy transmission while increasing power density. In this paper, the principle and characteristics of the converter are analyzed in detail, and the design of key parameters is analyzed in detail. Finally, the 40V-60V/400V 1kW experimental prototype is built to verify the correctness of the theoretical analysis.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM46

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