Faculty Publications
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Item Interconnection of wind-solar hybrid Renewable Energy source to the 3 phase-3 wire distribution system along with power quality improvements at the grid side(Institute of Electrical and Electronics Engineers Inc., 2015) Gururaj, M.V.; Vinatha Urundady, U.; Jayasankar, V.N.Scarcity of power has been one of the nightmare issues for mankind in the modern age. Renewable Energy Sources (RES) working parallel with conventional power plants are playing a lead role in narrowing the difference between supply and demand. Among all the available renewable energy sources wind-solar hybrid systems are the most popular one. Due to their natural advantage of being complimentary to each other, they are assuring reliability to the utility. Power quality issues arising due to the usage of non-linear loads at the point of common coupling are addressed with the help of power electronic device interfacing RES to the grid. The work presented in this paper consists of Modeling and Simulation of wind-solar hybrid energy system and interfacing it to the grid through the interfacing inverter. A suitable control strategy which will add shunt active filter functionality to the RES interfacing device to the grid is also undertaken. © 2015 IEEE.Item 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. © 2016 IEEE.Item Implementation of adaptive fuzzy controller in a grid connected wind-solar hybrid energy system with power quality improvement features(Institute of Electrical and Electronics Engineers Inc., 2016) Jayasankar, V.N.; Vinatha Urundady, U.Energy demand increases rapidly, utilization of renewable energy resources plays an important role in narrowing down the supply-demand difference. Introduction of more power electronic devices and non-linear loads pollutes the grid and create power quality problems. Both the scarcity of energy problem and power quality problem can be simultaneously solved by using the grid interfacing inverter of renewable sources, as a shunt active filter. A suitable control strategy has to be used for giving grid interfacing inverter, the power of power quality improvement. Conventional PI controller can be replaced with a fuzzy controller for better control, and thus improve the system performance. In this paper, a grid connected hybrid system of wind-solar with power quality improvement features is simulated with a PI controller, and then results are compared by replacing PI with fuzzy controller. © 2016 IEEE.Item Current injection based front-end power quality improved converter for telecom load(Institute of Electrical and Electronics Engineers Inc., 2017) P, P.; Kalpana, R.; Singh, B.; Bhuvaneswari, G.In this paper a front-end converter having third harmonic current injection technique is used for improving input current shape as near sinusoidal. Here zig-zag transformer is used as the current injection device so that the advantages pertaining to zig-zag transformer is utilized effectively. The third harmonic current injection device along with the three-level boost converter at the output stage will increase the dc-link voltage and the current is injected through zig-zag transformer. The power quality is well improved using third harmonic current modulated front-end structure which is very well applicable to telecom load having the high current low voltage. Extensive simulation is carried out for the 12 kW load and the results are verified through experimental setup. The experimental setup is tested for reduced voltage rating and the test results are presented. © 2016 IEEE.Item Power quality improvement in front-end hybrid AC-DC converter based on current injection technique(Institute of Electrical and Electronics Engineers Inc., 2017) P, P.; Kalpana, R.; Singh, B.; Bhuvaneswari, G.This paper highlights the power quality issues and explains the remedial measures taken by means of hybrid frontend third harmonic current injection rectifiers. Here zig-zag transformer is used as the current injection device so that the advantages pertaining to zig-zag transformer is utilized effectively. The third harmonic current injection device along with the three-level boost converter at the output stage will increase the dc-link voltage. Also, the power quality is well improved using third harmonic current modulated front-end structure which is well appropriate to medium/higher power applications. The experimental prototype of hybrid front-end PFC rectifier is developed in the laboratory to validate the MATLAB simulation results. © 2017 IEEE.Item Design and Implementation of Sensorless Voltage Control of Front-End Rectifier for Power Quality Improvement in Telecom System(Institute of Electrical and Electronics Engineers Inc., 2018) P, P.S.; Kalpana, R.; Singh, B.; Bhuvaneswari, G.In this paper, a three-phase three-switch three-level boost (Vienna) type pulse-width modulation rectifier is proposed as an active front-end power factor correction (PFC) rectifier for power quality improvement in telecom load. A sensorless voltage control technique is proposed and it does not rely on any input voltage information results in reliable and robust operation. A brief description on the principle of operation and the most advantageous modulation method of the proposed system are discussed. The feasible switching states are identified for the proposed active front-end converter resulting in reduced switching stress and dc ripples. A triangular carrier based control logic is applied and the input current reaches sinusoidal shape without the need of sensing the input voltage. The detailed analysis of front-end PFC converter is carried out by equivalent circuit analysis. Also, the complete loss and efficiency calculation of the converter is explicitly carried out with the help of hardware design guidelines. The performance of the proposed system and its capability of operating satisfactorily in the event of failure of one phase of the mains is verified through MATLAB Simulation, and the results obtained are presented. The experimental setup rated for 9 kW is developed in the laboratory to validate the simulation results. From the simulation and hardware results, it is observed and recorded that the power quality parameters are improved and are well within the IEEE and IEC standards. © 1972-2012 IEEE.Item Power Quality Improvement in Utility Interactive Based AC-DC Converter Using Harmonic Current Injection Technique(Institute of Electrical and Electronics Engineers Inc., 2018) P, P.S.; Kalpana, R.; Singh, B.; Bhuvaneswari, G.This paper highlights the power quality issues and explains the remedial measures taken by means of hybrid front-end third harmonic current injection rectifiers. Here, a zig-zag transformer is used as the current injection device so that the advantages pertaining to the zig-zag transformer are effectively utilized. The third harmonic current injection device along with three-level boost converter at the output stage will increase the dc-link voltage. With less boost inductance, generally half of the conventional boost converter inductance is sufficient to implement the proposed converter structure resulting in reduced ripple current and also the device rating is reduced by half of the output voltage. Moreover, the power quality is well improved using third harmonic current modulated front-end structure, which is well appropriate for medium/higher power applications. The experimental prototype of hybrid front-end converter is developed in the laboratory to validate the MATLAB simulation results. © 1972-2012 IEEE.