SHEPWM Based New Hybrid Multilevel Inverter Topology with Reduced Switch Count Marif Daula Siddique, Saad Mekhilef, Noraisyah Mohamed Shah, Mudasir Ahmed Momon and Asif Mustafa Power Electronics and Renewable Energy Research Laboratory University of Malaya Kuala Lumpur, Malaysia email: marifdaula1@gmail.com Keywords «Multilevel Converters», «Pulse Width Modulation (PWM)», «Power Semiconductor Devices» «Power Conditioning» Abstract In this paper, a new single-phase hybrid multilevel inverter topology is proposed with reduced switch count. The basic unit of the proposed topology is capable of generating 13 levels at the output. A higher number of levels can be generated by extending the basic unit. Two different extensions of the basic unit have been proposed in the paper. The topology consists of a level generation unit (LGU) and the polarity changing unit (PCU). The level generation unit of the proposed topology is based on the series connection of multiple switched dc voltage sources with half and full bridge configurations. Selective Harmonic Elimination PWM (SHEPWM) based switching control technique has been employed for an improved harmonic spectrum. Performance and effectiveness of the proposed topology with the employed SHEPWM control have been substantiated by simulation results and verified by experimental results obtained from a laboratory prototype. Introduction With the technological advancements and the added advantages over conventional two-level inverters, the multilevel inverters have allowed increased focus owing to their evolving topologies. MLIs offer reduced voltage source counts, decreased switches and driver circuits in addition to high power quality, low harmonic distortion and reduced switching losses. With the advantage of a wide range of applications, they are used in the variable frequency drives, HVDC and Flexible AC transmission structure, Electric Vehicle drive, renewable energy systems, etc. The very first mentioned MLIs in literature are cascaded H-bridge MLI, Flying Capacitor MLI, and Diode Clamped MLI [1]– [4]. Numerous topologies have been presented in the literature with the aim of achieving a higher level of output voltage with reduced switch counts [5]–[8]. To increase the number of voltage levels with reduced switch counts, several MLIs have been demonstrated in [7], [9]–[13]. A new MLI topology has been proposed in [14], which uses 12 switches for the nine-level voltage generation. A similar topology has been proposed in [10], which uses three dc voltage source with seven switches for nine level output voltage. However, with four diodes used in the topology, the efficiency of the topology [10] has a poor value. The topologies proposed in [15] gives the optimal design of the topology, however, the required number of dc voltage sources are on the higher side. This paper proposes a new MLI topology with reduced switch and source count. The basic unit of the proposed topology uses 10 switches with three dc voltage sources to produce the 13 level output voltage waveform. The paper is organized as follows: Section II gives the details of the basic unit with the two extention of basic unit. Section III deals with the comparative study of the proposed basic unit. Section IV gives the details of the SHEPWM used for the optimal switching angle calculations. Section V provides the simulation hand hardware results and the paper is summarized in Section VI. SHEPWM based New Hybrid Multilevel Inverter Topology with Reduced Switch Count SIDDIQUE Marif EPE'19 ECCE Europe ISBN: 978-9-0758-1530-6 - IEEE catalog number: CFP19850-USB P.1 Assigned jointly to the European Power Electronics and Drives Association & the Institute of Electrical and Electronics Engineers (IEEE)