一种高升压比的Z源逆变器

A High Gain Z-Source Inverter

传统Z源逆变器能实现升降压变换的功能,同时桥臂不需要死区时间,变换器的可靠性高。引入的无源网络替代了Z源逆变器中和电源正极相连的电感,和传统Z源逆变器相比,可实现更高的电压增益。本文将这两种变换器作了比较,相对于传统的Z源逆变器,高升压比的Z源逆变器不仅具有更高增益的升压变换能力,而且降低了电容电压应力和电感电流纹波。本文在理论研究的基础上,基于简单升压控制方法的实验结果验证了该拓扑的优点。

This paper presents a high gain Z-source inverter（HG-ZSI）. The basic topology is known in the literature as a Z-source inverter（ZSI）. The ZSI has the ability of buck-boost conversion and no dead time is needed in phase legs, so high reliability can be achieved. Alternative impedance network which can achieve higher step-up performance compared to traditional ZSI is presented. A comparison between the new and traditional single-stage inverters is performed. The advantage over ZSI of the new inverter is not only able to boost dc input voltage to higher ac output by single stage power conversion, but also reduce the voltage stresses of capacitors and current ripple of inductor. The circuit operation principle is analyzed in detail. Simulation and experimental results under the simple boost control method are shown to verify the correctness and effectiveness.