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

Sustainability

Edris Pouresmaeil¹  Kumars Rouzbehi²  Ahmad Alijani³  Jafar Adabi³  Mohammad Rezanejad⁴  M.Ebrahim Adabi⁵  Amir Taghvaie⁶ 

[1] Department of Electrical Engineering and Automation, Aalto University, Maarintie 8, 02150 Espoo, Finland;Department of System Engineering and Automatic Control, University of Seville, 41004 Seville, Spain;Faculty of Electrical and Computer Engineering, Babol Noshirvani University of Technology, Mazandaran 47148-71167, Iran;Faculty of Engineering and Technology, University of Mazandaran, Babolsar 47416-13534, Iran;Intelligent Electrical Power Grids at Department of Electrical Sustainable Energy, Delft University of Technology, 5031, 2600 GA Delft, The Netherlands;School of Engineering, Deakin University, Geelong, VIC 3216, Australia;

关键词: multilevel inverters;    self-balanced;    single source;    transformerless;   

DOI  :  10.3390/su11123453

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown