A generalized single-phase cascaded multilevel inverter with reduced switch count
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ORIGINAL PAPER
A generalized single-phase cascaded multilevel inverter with reduced switch count Ratna Rahul Tupakula1 Received: 2 February 2020 / Accepted: 28 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The paper presents a new generalized topology-based single-phase cascaded multilevel inverter with reduced power electronic switches, thereby reducing the driver circuits. A new basic unit is proposed in this paper. In order to generate required voltages at the output, an H-bridge is added in conjunction with the basic unit as the unit provides only positive voltage levels. Owing to the merits possessed by cascaded multilevel inverter such as reduction in switch count, driver circuits, low stresses in voltage and their power quality being high, a basic unit is developed. A comparison between the existing topologies and the proposed topology is presented. The developed cascaded 9-level multilevel inverter topology is validated with both simulations and experimentation. Keywords Cascaded multilevel inverter · H-bridge · Reduced switch count · Basic unit
1 Introduction With the advanced growth in the field of photovoltaic interfaced electronic inverters, the demand for the development of high power application inverter has rapidly increased. However, it is not possible to interface a conventional twolevel inverter to high voltage network directly. Therefore, to address this issue, multilevel inverters (MLIs) are introduced and more novel topologies are being developed. MLI consists of the power semiconductor switches and dc sources utilized in output voltage levels generation as per the demand. When compared to two-level voltage-fed inverter, MLI generates the voltage levels with better-quality waveform. The improvement in the voltage waveform is because of total harmonic distortion reduction. The other additional advantages of MLIs in comparison with two-level inverters are the reduction in switching losses, switch voltage stresses individually and better electromagnetic interference [1–5]. MLIs are mainly classified as neutral point-clamped (NPC), flying capacitor and cascaded MLIs. NPC and flying capacitor MLIs consist of capacitors to develop different voltage levels. However, these configurations have a demerit
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Ratna Rahul Tupakula [email protected] Department of Electrical and Electronics Engineering, M. S. Ramaiah Institute of Technology, Bengaluru, India
of regulating the voltage of these capacitors. An asymmetric voltage topology in NPC as well as flying capacitor MLI can be developed; however, the power circuit becomes complicated with the increase in voltage levels because of increase in capacitors, thereby making the control scheme complex. Besides this, there will be increase in the count of capacitors with the increase in levels [6–9]. The cascaded H-bridge (CHB) inverter consists of stack of H-bridge with the isolated series-connected dc sources. These inverters do not require diode clamped or flying capacitors. Moreover, the CHB inverters possess
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