Extended Boost Switched-Embedded-Capacitor-Inductor ZSI with Low Voltage Stress on Capacitors and Soft-Start Capability

ABSTRACT

In the present article, the boost factor of the Z-source inverter is noticeably increased by using the switched-inductor structure. The proposed inverter is based on the switched-inductor Z-source inverter which has two series diodes in its switched-inductor. In the proposed ZSI instead of these two series diodes, two capacitors are used. In comparison with the conventional structure, in the smaller duty cycle ratio the proposed structures generate higher voltage. Besides, in the second proposed structure to reduce the voltages on the capacitors of the Z-source network, a dc source is placed between the inverter bridge and the Z-source network. The dc source and the inverter have common ground in both the proposed structures. The conventional and proposed inverters are thoroughly investigated to find out their governing relations, then, the boost factor and voltage across capacitors in both proposed and conventional inverters are compared with each other by simulating them in PSCAD/EMTDC. Next, the prototypes of the proposed inverters with 25 V dc input voltage are used to evaluate the obtained results.

KEYWORDS:

• Switched-capacitor-inductor Z-source inverter
• Switched-inductor
• Z-source inverter

Additional information

Notes on contributors

Milad Abbasi

Milad Abbasi received the BS degree in electrical engineering from Azad University of Tabriz, Iran, and the MS degree from the Azad University of Shabestar, Iran, in 2012 and 2014, respectively. He is a PhD student in Department of Electrical Engineering, Shiraz University of Technology, Shiraz, Iran. His current research interests include impedance source converter. Email: [email protected]

Mohammad Mardaneh

Mohammad Mardaneh received the BS degree in electrical engineering from Shiraz University, Iran, in 2002, and MS and PhD degrees in the same subject from Amirkabir University of Technology, Tehran, Iran, in 2004 and 2008, respectively. He has been associate professor at the Shiraz University of Technology, Shiraz, Iran, since 2008. His research fields cover modeling, design and control of electrical machines, and application of power electronics in renewable energy systems and distribution networks.

Amir Hossein Eslahchi

Amir Hossein Eslahchi received the BS degree in electrical engineering from Arak University, Arak, Markazy, Iran, in 2015. He is currently working toward the MS degree in the Shiraz University of Technology. His research interests include power electronics, impedance network, and power converters. Email: [email protected]

Zhaleh Hashemi

Zhaleh Hashemi was born in Isfahan, Iran, in 1981. She received a BSc degree in electrical engineering from the Isfahan University of Technology, Iran, in 2002 (as an invited student), and the MSc degree from the Amirkabir University of Technology, Tehran, Iran, and PhD degree from the Shiraz University of Technology in 2019 in power engineering. She is currently with the Electrical Engineering Department of Islamic Azad University, Zarghan Branch, Iran. Email: [email protected]