International Journal of Power Electronics and Drive Systems (IJPEDS) Vol. 15, No. 4, December 2024, pp. 2334~2343 ISSN: 2088-8694, DOI: 10.11591/ijpeds.v15.i4.pp2334-2343  2334 Journal homepage: http://ijpeds.iaescore.com SVPWM technique for 3-ph 6-switch and 3-ph 4-switch inverters - a comparison Golkonda Anitha 1 , Kondreddi Krishnaveni 2 , Guduri Yesuratnam 3 1 Department of Electrical Engineering, University College of Engineering, Osmania University, Hyderabad, India 2 Department of Electrical and Electronics Engineering, Chaitanya Bharati Institute of Technology, Hyderabad, India 3 Department of Electrical Engineering, University College of Engineering, Osmania University, Hyderabad, India Article Info ABSTRACT Article history: Received Feb 13, 2024 Revised Jun 30, 2024 Accepted Jul 24, 2024 A novel 3-phase 4-switch inverter (TPFSI) is described in this study to reduce the inverter's size, complexity, cost, and losses during the conduction and switching process. This TPFS inverter is based on the principle of similarity of a 3-phase 6-switch inverter (TPSSI) where αβ plane is separated into six sectors to form the required reference voltage space vector. It has been demonstrated that TPFS inverters are more efficient than TPSS inverters while operating with different loads. A mathematical concept for the space vector pulse width modulation (SVPWM) technique has been developed for TPFSI by using Clarke's transformation. In this paper, a TPFS inverter model is designed to reduce the harmonic content in the output voltage and current responses when connected to different loads. The suggested modulation method enhances the output voltage/current response, resulting in usually balanced waveforms and reduced harmonic distortion. MATLAB/Simulink software is utilized to analyze the output response of both inverters. Keywords: 3-ph 4-switch inverter (TPFSI) 3-ph 6-switch inverter (TPSSI) Clarke’s transformation DC-link voltage IGBT SVPWM This is an open access article under the CC BY-SA license. Corresponding Author: Golkonda Anitha Department of Electrical Engineering, University College of Engineering, Osmania University Hyderabad, India Email: mahanitha2006@gmail.com 1. INTRODUCTION Solar energy is a crucial renewable source that offers several benefits over non-renewable sources such as fossil fuels and coal. Solar energy generation is both ecologically beneficial and comparatively easy [1]. The inverter, considered the center of any solar energy system, transforms DC to AC and the switches are handled to provide synchronized and balanced AC output waveforms. A transformer is used in conventional inverters to boost the generated voltage to the required voltage. In photo voltaic (PV) applications, transformers are frequently utilized; however, the inverters’ efficiency and power density are reduced by these conventional transformers, which also increase the inverters’ weight, size, and cost. It is therefore preferable to avoid employing transformers in the inverter [2]. In some cases, cost reduction is an important target for the drive system. However, in the development of research for the inverter topologies to minimize components and reduce the cost and complexity of the system. Hence, the results prove that it is possible to replace a traditional 6-switch inverter with a reduced number of switches (with four switching devices) [3]. The traditional 3-phase 6-switch inverter (TPSSI) is now available in a more affordable form called 3-phase 4-switch inverter (TPFSI) also referred to as the B4 inverter. Several research investigations have been done to expand the application of four-switch inverters, especially in AC electrical machine drive systems [4]-[6]. The TPFS inverter is composed of two switching legs with four power switches each and one power leg with two serial capacitors as two load phases are taken from two