Improved Switched-Capacitor Switched-Inductor Z-source Inverter for Increasing Boost Factor and Decreasing Voltage Capacitors Stress

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.

KEYWORDS:

• Z-source inverter
• DC/AC converters
• Switched-inductors Z-source inverter

Additional information

Notes on contributors

Qixiang Huang

Qixiang Huang is a lecturer of Wenzhou Polytechnic and director of Teaching and Research Section of Mechanical Manufacturing and Automation. His research fields include mechatronics, nonlinear dynamics, etc. He has published more than 4 papers and 2 books.

Feng Wang

Feng Wang an associate professor of Wenzhou Polytechnic and vice director of Department of Mechanical Engineering. His research fields include mechatronics, electrical control, etc.He has published more than 3 papers and 3 books. Email: [email protected]

Jamal Abbasi Bolaghi

Jamal Abbasi Bolaghi was born in Zanjan, Iran in 1987. He received the BS degree in electrical engineering in Islamic Azad University Zanjan, Iran in 2013. He received the MS degree in electrical engineering from University of Zanjan, Iran in 2018. He focusses on power electronics, electronic transformer and converters. He works in Iran Transfo Company in Zanjan, Iran. Email: [email protected]