增强型准Z源逆变器的研究

发布时间：2018-03-15 06:07

  本文选题：Z源逆变器　切入点：开关电感　出处：《江苏大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着世界能源短缺以及环境污染问题的日益严重,越来越多的国家开始注重风能、太阳能等新能源的开发与利用。Z源逆变器作为一种新型逆变器,克服了传统电压源逆变器所存在的局限性,在新能源发电领域有良好的应用前景。但是Z源逆变器本身也存在升压能力不足、输入电流断续、电容电压应力大等问题,改进Z源逆变器性能有利于Z源逆变器在新能源发电领域的推广与应用。本文针对Z源逆变器存在的问题,对其拓扑结构加以改进,并对改进后的Z源逆变器展开研究。高升压能力是Z源逆变器能够应用在低压输入场合的重要前提,本文在分析常见Z源逆变器拓扑及升压能力的基础上,针对Z源逆变器及其衍生逆变器升压能力不足的问题,通过级联开关电感的方法来提升Z源逆变器的升压能力,在开关电感Ⅱ型准Z源逆变器的基础上进行拓扑改进,提出增强Ⅰ/Ⅱ型准Z源逆变器。与开关电感Ⅱ型准Z源逆变器相比,增强Ⅰ/Ⅱ型准Z源逆变器在相同直通占空比的情况下,直流链电压更高,能有效的提高逆变器的升压能力。同时,鉴于在相同器件数量的基础上,增强Ⅱ型准Z源拓扑在提高逆变器升压因子方面更有优势,所以选取增强Ⅱ型准Z源逆变器作为本文后续重点研究的“增强型准Z源逆变器”。随后本文对增强型准Z源逆变器的器件特性进行分析,指出在相同升压因子下,增强型准Z源逆变器在电容电压应力、电感电流纹波方面的优势,通过仿真验证理论分析的正确性。最后,本文给出增强型准Z源逆变器的主电路和控制电路的设计方案,介绍控制软件的设计流程,搭建增强型准Z源逆变器的实验平台。实验结果验证了本文所提出的增强型准Z源逆变器的可行性和优越性。
[Abstract]:With the increasing shortage of energy and environmental pollution in the world, more and more countries begin to pay attention to the development and utilization of new energy sources, such as wind energy and solar energy, as a new type of inverter. It overcomes the limitation of the traditional voltage source inverter and has a good application prospect in the field of new energy generation. However, the Z-source inverter itself also has some problems, such as insufficient boost capacity, intermittent input current, large capacitance voltage stress, and so on. Improving the performance of Z-source inverter is beneficial to the popularization and application of Z-source inverter in the field of new energy generation. And the improved Z-source inverter is studied. The high voltage boost capability is an important prerequisite for Z-source inverter to be used in low-voltage input field. This paper analyzes the common Z-source inverter topology and boost capacity. Aiming at the problem of insufficient boost capacity of Z-source inverter and its derived inverter, the boost capacity of Z-source inverter is enhanced by cascaded switching inductance, and topology improvement is carried out on the basis of switched inductance type 鈪，

本文编号：1614738