Grid-tied single source quasi-Z-source cascaded multilevel inverter for PV applications

• Published in: Electronics letters Vol. 55; no. 6; pp. 342 - 343
• Main Authors: Guisso, R.A, Andrade, A.M.S.S, Hey, H.L, Martins, M.L. da S
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 21.03.2019
• Subjects: auxiliary inverter modules; cascaded multilevel topology; dual control loop; grid‐tied single source quasi‐Z‐sourcecascaded multilevel inverter; inverter modules shares; invertors; main inverter module; maximum power point trackers; maximum power point tracking; photovoltaic array; photovoltaic power systems; Power electronics, energy conversion and sustainability; power generation control; power grids; PV applications; single inverter module; SS qZS‐CMI performs; voltage control; SS qZS-CMI performs; single inverter module; main inverter module; photovoltaic power systems; power generation control; auxiliary inverter modules; dual control loop; inverter modules shares; PV applications; cascaded multilevel topology; maximum power point trackers; invertors; photovoltaic array; maximum power point tracking; grid-tied single source quasi-Z-sourcecascaded multilevel inverter; power grids; voltage control
• ISSN: 0013-5194; 1350-911X; 1350-911X
• DOI: 10.1049/el.2018.8013

A new cascaded multilevel topology is proposed in this study. It is denominated single DC source quasi-Z-source cascaded multilevel inverter (SS qZS-CMI). The SS qZS-CMI performs at maximum power point tracking of the photovoltaic (PV) array with a single inverter module and each of the inverter modules shares an equal amount of the power of the whole system. The SS qZS-CMI has the capacity to equally regulate the peak voltage on each inverter module by means of the dual control loop of the main inverter module and the shoot-trough state of the auxiliary inverter modules, ensuring the symmetry of the cascaded multilevel inverter. Experimental results verify the proposed topology.