Conference Papers
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Item A comparison of seven-level inverter topologies for multilevel DC-AC power conversion(Institute of Electrical and Electronics Engineers Inc., 2014) Salodkar, P.; Sandeep, N.; Kulkarni, P.S.; Yaragatti, R.Y.Multilevel inverter (MLI) performance is high compared to the conventional two level inverters since they offer high power capability, associated with lower output harmonics and lower commutation losses. However the main drawback of MLI is their increased number of power devices, passive components, complex pulse width modulation control and balancing of capacitor voltages. In this paper the most popular topologies like diode-clamped inverter (neutral-point clamped), cascaded multicell with separate dc sources, and transistor clamped H-Bridge inverter are discussed. A simplified multilevel inverter (Switched Transistor MLI) is proposed and its performance is compared with the above said topologies. Component count and the % total harmonic distortion (THD) of the output voltage are considered as the indexes of the comparative performance. The operating principle of each topology, the most relevant modulation method of all the topologies and the detailed analysis of the proposed Switched Transistor MLI is included. The selection of topology and control techniques depends and varies according to power demands of inverter. Simulation study of all the topologies considered is carried out on MATLAB/SIMULINK platform and the performance of the proposed topology is verified experimentally by the tests performed on a scaled laboratory prototype. © 2014 IEEE.Item Novel asymmetrical multilevel inverter topology with reduced number of switches for photovoltaic applications(Institute of Electrical and Electronics Engineers Inc., 2015) Dhananjaya, D.; Sandeep, N.; Rao, G.R.The performance of multilevel inverter is high compared to the classical two level inverters owing to their reduced total harmonic distortion, and lower electromagnetic interference. However the setbacks of multilevel inverter are increased number of power devices, complex PWM and gating circuitry. In this paper, a new multilevel inverter topology, capable of generating large number of levels with fewer number of power switches, gating circuits and power diodes is proposed. In contrast to classical multilevel topologies, the presented topology consequences in reduction of the number of power devices and conduction losses. The proposed topology is asymmetrical, employing isolated dc sources of voltage ratio 421 (Binary fashion). Staircase control PWM at fundamental frequency is employed for the gating of power switches makes it suitable in applications like flexible alternative current transmission systems (FACTS), renewable energy sources, drives control and vehicle propulsion system. The structure of the proposed inverter is modular and thus best suited for PV applications. Detailed simulation is carried out using MATLAB/SIMULINK platform and simulation results are presented. © 2015 IEEE.Item Single-phase modular multilevel inverter based grid-connected photovoltaic system(Institute of Electrical and Electronics Engineers Inc., 2016) Sandeep, N.; Yaragatti, R.Y.This paper presents a control scheme for single-phase grid-connected modular five-level inverter applied to photovoltaic (PV) system. The five-level topology considered consists of two series connected H-bridge cells popularly known as cascaded H-bridge inverter. The reason that it requires an isolated dc sources makes it very attractive and its inherent modularity, easy scalability makes the system more reliable. One of the main challenges associated with multilevel converter is to control the drift in dc-link voltage caused by the power imbalance of the cells. A two loop control scheme is proposed to combat this issue; it consists of an asynchronous frame or proportional resonant (PR) for regulating the grid current and a proportional integral (PI) controller for regulating dc-link voltage. The proposed scheme regulates the dc-link voltage independently, in accordance with the reference value generated by the maximum power point tracking (MPPT) algorithm enabling the extraction of maximum power from each module. The inverter injects current which is in phase with the grid voltage ensures the unitary power factor operation with zero reactive power and less total harmonic distortion. The proposed control scheme can be extended to any number of cells connected in series for increasing the number of level in output voltage. Simulation results are presented to validate the analytical expectations and the control scheme developed. © 2015 IEEE.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 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 Switched-Capacitor Based Nine-level Boost Inverter Circuit for Mining Applications(Institute of Electrical and Electronics Engineers Inc., 2022) Prudhvi Krishna, B.N.V.V.; Kunar, B.M.; Murthy, C.S.N.A dual boost nine-level inverter for mining applications is proposed in this work. Capacitors are used as virtual sources to boost the voltage magnitude and increase the levels. Additionally, the proposed MLI circuit inherits benefits such as self-balancing capacitors, less blocking voltage, and fewer components. A simple PD-PWM scheme is used to generate gating signals. Circuit portrayal, operating principle, modulation, and capacitor voltage ripples are studied. MATLAB software is used to carry out simulations, and the obtained outcomes prove the boosting ability under different loading circumstances. A detailed comparative review is conducted with other recent SCMLIs to illustrate the superiorities of the proposed circuit. © 2022 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.