A Transformerless Enhanced-Boost Quasi-Z-Source Inverter with Low Input Current Ripple for Stand-Alone RES-Based Systems

Hamed Tahami, Ehsan Akbari, Adil Hussein Mohammed, Reza Faraji and Sittiporn Channumsin ()
Additional contact information
Hamed Tahami: Department of Electrical Engineering, Politecnico di Milano, 20133 Milan, Italy
Ehsan Akbari: Department of Electrical Engineering, Mazandaran University of Science and Technology, Babol 47166-85635, Iran
Adil Hussein Mohammed: Department of Communication and Computer Engineering, Faculty of Engineering, Cihan University-Erbil, Erbil 44001, Kurdistan Region, Iraq
Reza Faraji: Department of Electrical Engineering, Shahed University, Tehran 33191-18651, Iran
Sittiporn Channumsin: Space Technology Research Center, Geo-Informatics and Space Technology Development Agency (GISTDA), Chonburi 20230, Thailand

Energies, 2023, vol. 16, issue 6, 1-33

Abstract: The main drawback of DC-source-based renewable energy sources (RESs), such as photovoltaic (PV) panels or fuel cells (FCs), is that the voltage generated by a panel or cell is less than the required voltage for connection to a DC–AC inverter for grid applications. In this paper, a single-switched DC–DC boost converter equipped with a quasi-impedance source inverter (QZSI) with a modified switching model is proposed to increase the output voltage of these RESs and convert it to a fixed AC grid voltage for loads. By changing the position of the inductor in a classic step-up converter and using a switched-inductor block, the input current ripple is significantly decreased, and the reliability and long-life of the input sources are increased, which is the main contribution of this work. The quality of the generated AC voltage and the low amount of total harmonic distortion (THD) in the projected topology are significant, and no overshoot and undershoot have been reported for both output voltages and currents under different operating conditions with variable loads. Theoretical analysis, simulation results, and comparison with similar topologies are examined and a prototype with a power of 200 to 400 watts is presented. Experimental results confirm the theoretical studies.

Keywords: photovoltaic (PV) cell; DC–DC boost converter; quasi Z-source; switched-inductor cell; inverter; grid connection (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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