Browsing by Author "Behara, S."

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Design and Implementation of Transformer-Based Multilevel Inverter Topology with Reduced Components
(Institute of Electrical and Electronics Engineers Inc., 2018) Behara, S.; Sandeep, N.; Yaragatti, U.R.
This paper presents a nine-level transformer-based inverter requiring only eight switches. The envisaged structure consists of two standard H-bridges fed from a single dc source. Besides, a single-phase transformer is employed to aid the process of intermediate voltage level generation. An ad-hoc pulsewidth modulation scheme based on boolean logic form equations is developed to derive the gating pulses. An effortless extension of the proposed inverter to a higher number of voltage levels is also achieved by generalizing the switching functions. Furthermore, the superior performance of the proposed topology is demonstrated through a comprehensive cost-based analysis. Finally, the validation of the proposed topology is accomplished through experiments on a down-scale prototype, and the measurement results are included. © 1972-2012 IEEE.
Simplified transformer-based multilevel inverter topology and generalisations for renewable energy applications
(Institution of Engineering and Technology journals@theiet.org, 2018) Behara, S.; Sandeep, N.; Yaragatti, U.R.
Multilevel inverters (MLIs) generating high-quality voltage waveforms are playing a significant role in renewable energy applications. However, the requirement of higher number of power devices, complex pulse-width-modulation (PWM) and voltage unbalancing issues are the impediments associated with their direct usage. Consequently, several attempts to devise MLIs with lesser number of overall components are witnessed. This study focuses on developing a nine-level inverter comprising of a single transformer and reduced component count. An optimisation of the number of transformers and their turn's ratio for a given number of voltage levels resulting in the least number of switches is investigated and deliberated in detail. Besides, an uncomplicated logic gate-based PWM strategy is developed for generating the gating signals of switches using simple Boolean logic relations. A detailed comparison with other recommended MLI topologies is presented to highlight the notable features of the proposed topology. Simulation results obtained using the model developed in MATLAB/Simulink along with the experimental measurements obtained from a downscale prototype is presented to validate the practicability, effectiveness, and viability of the proposed topology. An explicit agreement among the simulation and experimental results is observed. © The Institution of Engineering and Technology 2017.
Transformer-Based seven-level inverter with single-dc supply for renewable energy applications
(2016) Behara, S.; Sandeep, N.; Udaykumar, R.Y.
This paper puts forward a single-DC source based seven-level inverter for harvesting energy from renewable sources. Three single-phase transformers with cascaded outputs are powered from the switching power circuit resulting in then generation of multilevel at the output of the inverter. The proposed configuration can generate output voltage having levels of magnitude (-3VDC, -2VDC, -VDC, 0, VDC, 2VDC, 3VDC) from the DC supply (VDC). Structurally this topology exhibits the advantage of fewer power devices in comparison to conventional inverter for the generation of same number of output voltage levels. Simple logic gate based gating pulse generation scheme is suggested obviating the need for complex pulsewidth-modulation (PWM) scheme. Simulation results confirming the viability and effectiveness of the proposed inverter are presented. � 2016 IEEE.
Transformer-Based seven-level inverter with single-dc supply for renewable energy applications
(IEEE Computer Society help@computer.org, 2016) Behara, S.; Sandeep, N.; Yaragatti, R.Y.
This paper puts forward a single-DC source based seven-level inverter for harvesting energy from renewable sources. Three single-phase transformers with cascaded outputs are powered from the switching power circuit resulting in then generation of multilevel at the output of the inverter. The proposed configuration can generate output voltage having levels of magnitude (-3VDC, -2VDC, -VDC, 0, VDC, 2VDC, 3VDC) from the DC supply (VDC). Structurally this topology exhibits the advantage of fewer power devices in comparison to conventional inverter for the generation of same number of output voltage levels. Simple logic gate based gating pulse generation scheme is suggested obviating the need for complex pulsewidth-modulation (PWM) scheme. Simulation results confirming the viability and effectiveness of the proposed inverter are presented. Â© 2016 IEEE.