Faculty Publications
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Item A Dual Boost Multilevel Inverter Circuit for Renewable Energy Applications(Institute of Electrical and Electronics Engineers Inc., 2020) Bharadwaj, L.; Yellasiri, Y.; Shiva Naik, B.S.; Nageswar Rao, B.N.; Aditya, K.; Reddy, D.V.To minimise the dependence on fossil-fuels, researchers focused on integrating renewable energy with different power electronic inverters. In that process multilevel inverters (MLIs) have gained more attention due to its impeccable advantages. In this work, a novel topology with boost ability, and reduced number of components is proposed. Capacitors used in the proposed structure possess self-balancing ability and the works competently under any loading condition. It is worthy to mention that the blocking voltage of proposed circuit is with in the limits of source voltage even with the dual boost. Sinusoidal pulse width modulation switching strategy technique is employed to get gating signals. Simulation using MATLAB is carried-out to assess the performance of proposed inverter. Further, the proposed circuit is compared with switched-capacitor (SC) based MLIs in terms of number of switches, and standing voltage to highlight the potential merits. © 2020 IEEE.Item A Novel Switched-Capacitor Boost Multilevel Inverter for PV Applications(Institute of Electrical and Electronics Engineers Inc., 2020) Reddy, D.V.; Yellasiri, Y.; Shiva Naik, B.S.; Nageswar Rao, B.N.; Aditya, K.; Bharadwaj, L.Nowadays, voltage boosting capability with less part count has become the key feature of recently developed MLI topologies. In this work, a novel topology with boost ability, and reduced number of components is proposed. Capacitors used in the proposed structure possess self-balancing ability and the works competently under any inductive-resistive loading conditions. The blocking voltage of proposed circuit is with in the limits of source voltage even with the dual boost. Sinusoidal pulse width modulation switching strategy technique is employed to get gating signals. Simulation using MATLAB is carried-out and hardware tests are conducted with the available components to assess the performance of proposed inverter. Further, the proposed circuit is compared with switched-capacitor (SC) based MLIs in terms of number of switches, and standing voltage to highlight the potential merits. © 2020 IEEE.Item A Fault Tolerant Nine-level Inverter Topology with Full DC Utilization for Electric Vehicle Application(Institute of Electrical and Electronics Engineers Inc., 2022) Aditya, K.; Yellasiri, Y.; Shiva Naik, B.S.; Nageswar Rao, B.N.In this study, a fault-tolerant nine-level inverter architecture for an electric vehicle application is presented. Although the importance of two-level inverters [1] is well-known in EV applications, it contains significant unwanted harmonics for generated voltage. As replacing a two-level inverter proliferates the quality of power with a multilevel inverter, it is considered one of the efficient ways. Even though multilevel inverters' essence considerably reduces total harmonic distortion. Eventually, the size of the filter requirement also will minimize. Because of the increased device count and capacitor voltage balance issues, we have a slew of reliability concerns. As a result, a fault-tolerant nine-level inverter built by cascading H-Bridge [2] and modified T-type voltage source inverters [3] and a bidirectional switch are presented. With the tiniest changes in the switching combinations, the provided inverter topology can sustain system faults caused by the failure of the source and/or switching devices. Subsequently, When compared to standard nine-level inverters, it features fewer switching devices. The results are observed and validated with a hardware platform while the suggested system is simulated in a MATLAB/Simulink environment under standard and malfunctioning settings. © 2022 IEEEItem A Novel Seven level inverter with Common-Leg Configuration by Employing Transformers(Institute of Electrical and Electronics Engineers Inc., 2022) Nageswar Rao, B.; Yellasiri, Y.; Shiva Naik, B.S.; Aditya, K.This paper proposes a new multilevel inverter with a common leg structure using three transformers and eight power semiconductor devices. The intended configuration contains of one traditional H-bridge and two half bridges supplied from a single dc source. The switching power circuit powered three transformers with series connections, which produced seven levels (3VDC, 2VDC, VDC, 0, -VDC, -2VDC, -3VDC) at the inverter output from the source VDC. Further, this circuit demonstrates the benefit of fewer switches and drivers in comparison to the traditional circuits for the production of the same load voltage levels. Thus, the suggested topology complexity, volume, and cost are reduced. Finally, the effectiveness of the suggested inverter is performed using MATLAB, and the simulation studies are incorporated. © 2022 IEEE.Item Performance Analysis of Novel Multilevel Inverter with Minimum Number of Switching Components(Institute of Electrical and Electronics Engineers Inc., 2023) Kumar, T.A.; Yellasiri, Y.; Nageswar Rao, B.N.; Aditya, K.; Shiva Naik, B.S.; Karunakaran, E.The immense growth in Multilevel inverters are a great development for industrial and renewable energy applications due to their dominance over conventional two-level inverters concerning size, rating of switches, filter requirement, and efficiency. According to the current topology, the multilevel inverter employing the bidirectional converter is a DC connection that serves as the bidirectional inverter's input power. The bidirectional inverter is configured to output a voltage with several levels by altering the voltage with the bidirectional converter. Also, because there is no need for a low-frequency transformer or an LC filter at the output stage of the multi-level inverter in the present topology, the frequency does not pose any difficulties. In comparison to other traditional topologies, using an asymmetrical multilevel inverter architecture employs fewer switching components to create greater levels. This study proposes a 27-level multilevel inverter with fewer switching components. To validate the technique, the simulation results are shown. © 2023 IEEE.Item Novel Nine-level Inverter Topology with Boosting Ability for Electric Vehicle Application(Institute of Electrical and Electronics Engineers Inc., 2023) Aditya, K.; Yellasiri, Y.; Shiva Naik, B.S.; Nageswar Rao, B.N.; Karunakaran, E.; Reddy, R.D.This paper proposes a new switched-capacitor (SC) based multilevel inverter (MLI) with a boosting gain of four for electric vehicle (EV) applications. The proposed SC-based ninelevel quadruple boost inverter (SC-NLQBI) topology consists of 13 semiconductor switches, three capacitors, and a single input DC supply. It generates nine level voltage waveform, which lessens the requirement for extra filters. Compared to the current nine-level inverter, the new SC-NLQBI topology is simple, compact, and requires fewer parts. Here, a simple triangular carrier signal-based sinusoidal pulse width modulation (SPWM) method is used to generate the required gating pulses. While the proposed topology is being modeled in a MATLAB/Simulation platform using both normal and problematic conditions, the results are analyzed. © 2023 IEEE.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 Single DC-source Asymmetrical Multilevel Inverter With Solid State Transformer With New Switching Approach(Institute of Electrical and Electronics Engineers Inc., 2024) Karunakaran, E.; Yellasiri, Y.; Nageswar Rao, B.N.; Vivek, P.S.S.; Aditya, K.Cascaded H-bridge (CHB) MLI have emerged as the preferred choice due to their high quality in output waveforms with low harmonic distortion. However, a key limitation in these inverters lies in the requirement of a dedicated DC source for each bridge. To overcome this challenge, there is a transition towards asymmetrical cascaded H-bridge (ACHB) MLIs, enabling the use of a variable DC source for each bridge. The variability in DC supply is achieved through a high-frequency link. This paper introduces a novel optimized switching technique for asymmetrical cascaded H-bridge (ACHB) MLIs with a single DC input incorporating a high-frequency link (HFL). The effectiveness of the suggested approach in achieving a 27-level asymmetric multilevel inverter is substantiated by experimental outcomes obtained through MATLAB/Simulink simulations. © 2024 IEEE.Item A novel nine-level boost inverter with a low component count for electric vehicle applications(John Wiley and Sons Ltd, 2021) Shiva Naik, B.S.; Yellasiri, Y.; Aditya, K.; Nageswar Rao, B.N.In electric vehicles (EVs), considerable battery cells are cascaded in series for motor driving to improve the output voltage. The series combination of battery cells causes challenges like isolation of faulty cells, voltage unbalance, and slow charge equalization. Therefore, state-of-charge (SOC) and voltage equalization circuits are often used in industries to protect the battery cells. A nine-level inverter circuit with a double voltage boost is proposed to reduce the above issues based on the switch-capacitor (SC) principle. Unique features like self-balancing, voltage boosting are attained, which cannot be achieved through traditional inverters. The proposed topology can operate at a wide range of modulation indices ((Formula presented.)) to produce different voltage levels. The absence of a back-end H-bridge in the proposed circuit offers low voltage stress across the semiconductors. The operating principle, capacitor sizing, and modulation approach are presented. Further, experimental tests are conducted at different loading conditions to verify the performance of the proposed circuit. © 2021 John Wiley & Sons Ltd.Item A novel single source multilevel inverter with hybrid switching technique(John Wiley and Sons Ltd, 2022) Nageswar Rao, B.; Yellasiri, Y.; Shiva Naik, B.; Venkataramanaiah, J.; Aditya, K.; Panda, A.A novel multilevel inverter (MLI) configuration with the hybrid switching technique is presented in this paper. The proposed MLI consists of the H-bridge combination with unidirectional switches, half-bridges, and transformers. The suggested MLI with the additional cascaded connection increases to higher voltage levels. The number of employed components in this topology is drastically minimized. Therefore, the complexity, cost, and volume of the proposed topology are also reduced. The operation of the suggested topology is tested through the improved novel switching technique. This modulation method reduces the total harmonic distortion (THD) and produces high root mean square (RMS) voltage. Further, a comprehensive comparison with the recent MLI topologies is performed to validate the merits of the suggested inverter. Simulation and experimental results verify the suggested topology performance using the new modulation technique at different loading conditions and modulation indices. © 2021 John Wiley & Sons, Ltd.