Single-Phase Step-Up Switched-Capacitor-Based Multilevel Inverter Topology With SHEPWM

Marif Daula Siddique, Student Member, IEEE, Saad Mekhilef Senior Member, IEEE, Sanjeevikumar Padmanaban, Senior Member, IEEE, Mudasir Ahmed Memon, and Chandan Kumar , Senior Member, IEEE 1 Department of Electrical Engineering, Qatar University, Doha, Qatar 2 Power Electronics and Renewable Energy Research Laboratory, Department of Electrical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia 3 School of Software and Electrical Engineering, Swinburne University of Technology, Melbourne, Victoria, Australia 4 Department of Energy Technology, Aalborg University, Esbjerg, Denmark 5 Department of Electronics and Electrical Engineering, IIT Guwahati, India Corresponding Author: Saad Mekhilef (saad@.um.edu.my)  Abstract -Multilevel inverter (MLI) topologies play a crucial role in the dc-ac power conversion due to their high-quality performance and efficiency. This paper aims to propose a new switched-capacitor based boost multilevel inverter topology (SCMLI). The proposed topology consists of nine power semiconductor switches with one dc voltage source and two capacitors, capable of generating a nine-level output voltage waveform with twice voltage gain. With the addition of two switches, the proposed topology can be used for higher voltage gain applications. Other features of the proposed topology include self-voltage balancing of capacitors, parallel operation of capacitors, lower voltage stress across the switches, along with inherent polarity changing capability. To obtain the high-quality output waveform, selective harmonic elimination pulse width modulation (SHEPWM) technique is applied. In this technique, the detrimental low-order harmonics can easily be regulated and eliminated from the output voltage of MLI. The proposed topology is compared with the recently introduced SCMLI topologies considering various parameters to set the benchmark of the proposed topology. The performance of the proposed MLI is investigated through various experimental results using a laboratory prototype setup.