Faculty Publications
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Item Design of a New Single-Phase 15-Level Inverter with Minimized Components(Institute of Electrical and Electronics Engineers Inc., 2023) Nageswar Rao, B.N.; Yellasiri, Y.; Shiva Naik, B.S.; Aditya, K.; Karunakaran, E.; Kumar, M.V.Multilevel inverters (MLI) provide a number of challenges, the most significant of which is the requirement for a high number of power semiconductors and separate dc supplies to assimilate renewable energy into a grid successfully. Because of this, reducing the number of components used in these kinds of inverters is quite important. Because transformer-based multilevel inverters (TBMIs) have become more commonplace, the use of many dc supplies in the cascaded inverter is no longer necessary for the device to function. Based on the outcomes of this study, a new transformer-based MLI with fifteen levels (15L) and eight switches can be built with only one dc source required. The suggested MLI consists of three isolated transformers. The suggested MLI structure has many unique benefits, including the use of fewer switching components and the availability of self-galvanic isolation. The MATLAB simulation results are carried out to evaluate the effectiveness of the suggested TBMLI. In addition, a comparison of the suggested structure to other recent configurations is presented. © 2023 IEEE.Item A novel nine-level inverter with reduced component count using common leg configuration(Springer Science and Business Media Deutschland GmbH, 2023) Nageswar Rao, B.; Yellasiri, Y.; Shiva Naik, B.S.; Aditya, K.This article proposes a nine-level (9 L) inverter with a common leg configuration employing transformers and a single dc source. The suggested inverter uses eight switches and two transformers to produce 9 L output voltage. The suggested circuit minimizes the switches and transformers compared with existing transformer-based multilevel inverters (TMLI). Therefore, the proposed circuit cost, volume and complexity are also reduced. Additionally, a thorough comparison with the various 9 L inverter circuits is conducted to ensure the benefits of the suggested TMLI. A basic logic gate-based pulse width modulation (PWM) is implemented for the suggested 9 L inverter. Simulation and hardware studies verifying the feasibility and proficiency of the suggested inverter are performed. © 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.Item A modified T-type multilevel inverter for renewable energy applications(Elsevier Ltd, 2024) Nageswar Rao, B.; Yellasiri, Y.; Shiva Naik, B.S.; Aditya, K.; Panda, A.K.The primary challenge in integrating renewable resources into grids using multilevel inverters (MLI) is the need for many separate DC sources and switching device counts. Transformer-based multilevel inverters (TMIs) have emerged to address this issue, aiming to minimize system components and boost source voltage with a single DC source. This research article introduces a novel TMI topology that utilizes only a single DC source and incorporates ten switches to produce good-quality load voltage with high magnitude. The proposed TMI offers several structural advantages, including self-galvanic isolation, reduced switching devices and uniform voltage levels across all turn ratios. Additionally, the TMI operates a switching method called pulse width modulation, which provides the gating pulses to all the power semiconductor devices in the proposed TMI. An experimental model has been created in a laboratory environment, and simulations are performed using the MATLAB/Simulink platform to assess the effectiveness of the suggested TMI. Furthermore, a comparison between the suggested TMI circuit and other recent TMI designs with similar characteristics is performed. This comparison is carried out to assess and validate the superior features of the proposed TMI over the alternative designs. © 2024 Elsevier B.V.Item Design and implementation of novel multilevel inverter with full DC-utilization(Taylor and Francis Ltd., 2025) Nageswar Rao, B.; Yellasiri, Y.; Aditya, K.; Shiva Naik, B.S.; Karunakaran, E.This paper presents a novel single-source transformer-based nine-level (9 L) inverter configuration. The design incorporates a three-level neutral-point-clamped (3 L NPC) inverter, a 3-L full bridge, and a transformer to produce 9 L output voltage levels. In particular, one of the 2 L legs in the full bridge is common among the transformer and the load. The proposed structure minimises the components compared to existing transformer-based nine-level inverters. Thus, the suggested inverter volume, cost, and complexity are minimised. Furthermore, a pulse width modulation method has been developed to generate the necessary gating pulses for the proposed inverter. Additionally, a complete comparison study illustrates the enhanced performance of the suggested architecture. The validity of the suggested 9 L inverter is assessed by performing MATLAB simulations and using a scaled prototype. The results obtained from the simulations and experimental tests are then presented and analysed. A clear correlation was observed between the simulation and the hardware results. © 2024 Informa UK Limited, trading as Taylor & Francis Group.