Grid-Tied Single-Phase Integrated Zeta Inverter for Photovoltaic Applications

Anderson Aparecido Dionizio, Leonardo Poltronieri Sampaio (), Sérgio Augusto Oliveira da Silva and Sebastián de Jesús Manrique Machado
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Anderson Aparecido Dionizio: Electrical Engineering Department, Federal University of Technology—Paraná, Cornélio Procópio 86300-000, PR, Brazil
Leonardo Poltronieri Sampaio: Electrical Engineering Department, Federal University of Technology—Paraná, Cornélio Procópio 86300-000, PR, Brazil
Sérgio Augusto Oliveira da Silva: Electrical Engineering Department, Federal University of Technology—Paraná, Cornélio Procópio 86300-000, PR, Brazil
Sebastián de Jesús Manrique Machado: Electrical Engineering Department, Federal University of Technology—Paraná, Apucarana 86812-460, PR, Brazil

Energies, 2023, vol. 16, issue 9, 1-19

Abstract: Recently, the development of integrated inverters for photovoltaic systems has been widely performed to reduce overall system size, costs, and losses. Thus, integrated inverters have emerged as a prominent solution for replacing two-stage power conversion composed of a step-up converter and a voltage source inverter. Thereby, this paper proposes an integrated inverter topology for single-phase grid-tied photovoltaic systems. The proposed power converter, called a Single-Phase Integrated Zeta Inverter (SP-IZI), can boost the input voltage and inject a sinusoidal and regulated current into the mains with low harmonic distortion. The SP-IZI is based on integrating modified DC-DC Zeta converters, designed and controlled to operate in a discontinuous conduction mode, and presents similarities with the Modified Zeta Inverter (MZI). In this way, this paper compares the main parameters of both topologies and provides a complete study of the SP-IZI, involving both quantitative and qualitative studies as well as a small signals analysis. The feasibility and functionality of the proposed SP-IZI inverter are presented and evaluated through experimental results, which demonstrate that the SP-IZI presents the following advantages compared to the MZI: (i) the voltage in coupling capacitors is 13% lower; (ii) voltage stresses in switches and diodes are 40% lower; and (iii) static gain is similar to the traditional Zeta converter.

Keywords: DC-AC power conversion; integrated inverter; integrated zeta inverter; photovoltaic systems; zeta converter (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
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