An Asymmetrical Step-Up Multilevel Inverter Based on Switched-Capacitor Network

Amir Taghvaie, Ahmad Alijani, M. Ebrahim Adabi, Mohammad Rezanejad, Jafar Adabi, Kumars Rouzbehi and Edris Pouresmaeil
Additional contact information
Amir Taghvaie: School of Engineering, Deakin University, Geelong, VIC 3216, Australia
Ahmad Alijani: Faculty of Electrical and Computer Engineering, Babol Noshirvani University of Technology, Mazandaran 47148-71167, Iran
M. Ebrahim Adabi: Intelligent Electrical Power Grids at Department of Electrical Sustainable Energy, Delft University of Technology, 5031, 2600 GA Delft, The Netherlands
Mohammad Rezanejad: Faculty of Engineering and Technology, University of Mazandaran, Babolsar 47416-13534, Iran
Jafar Adabi: Faculty of Electrical and Computer Engineering, Babol Noshirvani University of Technology, Mazandaran 47148-71167, Iran
Kumars Rouzbehi: Department of System Engineering and Automatic Control, University of Seville, 41004 Seville, Spain
Edris Pouresmaeil: Department of Electrical Engineering and Automation, Aalto University, Maarintie 8, 02150 Espoo, Finland

Sustainability, 2019, vol. 11, issue 12, 1-18

Abstract: This paper presents a transformerless step-up multilevel inverter based on a switched-capacitor structure. One of the main contributions of the proposed topology is replacing the separated DC voltage source with capacitors which are charged at predetermined time intervals. Therefore, a high-level staircase voltage waveform can be achieved by discharging some of these capacitors on the load. The other contribution of the proposed structure is to eliminate the magnetic elements which traditionally boost the input DC voltage. In addition, asymmetrical or unequal amounts of capacitor voltages create more voltage levels, which enable voltage level increments without increasing the number of semiconductor devices. This paper introduces a self-balanced boost Switched-Capacitors Multilevel Inverter (SCMLI) which is able to create a nearly sinusoidal voltage waveform with a maximum voltage of up to 45 times that of the input voltage DC source. Higher level output voltage levels are also achievable by extending the circuit topology. After determination of the switching angles and selecting the proper switching states for each level, an offline NLC method is used for modulation, which eases the control implementation. Analysis, simulation and experiments are carried out for a 91-level inverter (45 levels for positive and negative voltages and one for zero voltage) are presented.

Keywords: multilevel inverters; self-balanced; single source; transformerless (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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