ABSTRACT

In this paper, the concept of one switched-inductor Z-source inverter is extended to improved switched-capacitor inductor ZSI. In the proposed inverter, capacitors are used instead of the side diodes of the one switched inductor Z-source inverter. The proposed inverter improved voltage gain and boost factor compared to the switched-inductor Z-source inverter and the switched-inductor quasi Z-source inverter. The improved switched-inductor-capacitor Z-source inverter reduces the stress to capacitor voltage. The proposed inverter in this paper can be extended up to the n cascade, thus achieving a higher boost factor of a low duty cycle. The performance of the proposed structure at different operating modes is investigated, and the voltage equations are calculated. The analysis, derivation of the stress of switches voltage, the stress of capacitors voltage, the stress of diode voltage, the stress of inductor current, the gain of voltage, and the boost factor of the proposed inverters are carried out are compared with the similar inverters. To confirm the performance of the proposed converter, a laboratory sample of converters is made, in which, with $V_{dc}=60$ output for the improved switched-capacitor-inductor ZSI of converter, the DC-link (Vi) voltage is 200 with boost factor 1.67, which confirms the relationships obtained from the proposed converters.

摘要

在本文中，将开关电感器 Z 源逆变器的概念扩展到改进的开关电容器电感器 ZSI。在所提出的逆变器中，使用电容器代替单开关电感器 Z 源逆变器的侧二极管。与开关电感器 Z 源逆变器和开关电感器准 Z 源逆变器相比，所提出的逆变器提高了电压增益和升压因数。改进的开关电感电容Z源逆变器降低了电容电压的应力。本文提出的逆变器可以扩展到n级联，从而在低占空比的情况下实现更高的升压因数。研究了所提出的结构在不同工作模式下的性能，并计算了电压方程。开关电压应力的分析、推导，将所提出的逆变器的电容器电压应力、二极管电压应力、电感电流应力、电压增益和升压因数与同类逆变器进行了比较。为了确认所提出的转换器的性能，制作了转换器的实验室样品，其中，$V_{dC}=60$对于改进的开关电容器-电感器 ZSI 转换器的输出，直流母线 (Vi) 电压为 200，升压因数为 1.67，这证实了从所提出的转换器中获得的关系。