V. Sailaja currently serves as Assistant Professor (Sr. Gr.) at the department of Electrical & Electronics, School of Engineering, Amrota Vishwa Vidyapeetham, Bengaluru campus. 


Publication Type: Conference Paper

Year of Publication Title


G. P. Rahul, Teja, O. N., Shivani, P. G., Dr. K. Deepa, Manitha, P., and V. Sailaja, “Long Distance Power Transmission System with ZVS Ultra-Lift Luo Converter from Large Photovoltaic Generation”, in 2020 Third International Conference on Smart Systems and Inventive Technology (ICSSIT), Tirunelveli, India, India, 2020.[Abstract]

In this paper, long-distance power transmission with ZVS-Ultra lift Luo converter from photovoltaic modules and transmission using an underground cable is studied. However, today's long-distance AC distribution system tends to have losses and causes voltage instability. To avoid such problems, the DC distribution system can be used and to implement DC distribution, underground cables can be used which are more reliable than overhead lines. In this paper voltage lift scheme has been used in the design of power DC-DC converters successfully which have high voltage transfer gain. The ultra-lift Luo converter with Zero Voltage Switching(ZVS) is introduced as a unique approach to the new technology, which produces high output voltage along with less switching losses. Power generation from PV modules, design and analysis of ultra lift Luo converter along with ZVS and comparison between hard switching and soft switching for long-distance power transmission is done using MATLAB/Simulink.

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V. Sailaja, Dr. K. Deepa, A., S., P., R. E., and S., R. G. K., “Implementation of One Cycle Control for a Standalone System”, in International Conference on Trends in Electronics and Informatics, ICEI 2017, Tirunelveli, India , 2017.[Abstract]

The converter used in this paper is Double Input Isolated Flyback Converter which is more efficient in multi input and multi output systems. The control method adopted in this paper is One Cycle Control. The feasibility of the converter with this control is checked. The circuit has been simulated in MATLAB software and analysis performed are presented.

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B. M. Prabhakar, Ramprabhakar, J., and V. Sailaja, “Estimation and controlling the state of charge in battery augmented photovoltaic system”, in 2016 - Biennial International Conference on Power and Energy Systems: Towards Sustainable Energy, PESTSE 2016, Bangalore, India, 2016.[Abstract]

Today solar technology is proving reliable and increasingly affordable. It is good to environment and a secure energy supply. The overall carbon footprint for generating solar electricity is 30 times less than using coal. The main drawback in PV system is the fluctuation in solar energy supply. In this work Kalman filter is used to estimate the State of Charge in battery storage system, and hence it is possible to know about the duration for which the demand can be met. The SOC estimation technique using Kalman filter which is an accurate adaptive method and by using three switches the charge of battery is maintained within the safe limit (20%-80%) so that overcharging and over discharging can be eliminated and hence the battery life and performance can also be improved. The efficacy of the proposed method is verified by a set of simulation using MATLAB simulink.

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N. K., V. Sailaja, Dr. K. Deepa, and Manjunath, H. V., “A DC-DC multi output SEPIC converter for suburban power application”, in International Conference on Electronics, Communication and Computational Engineering, ICECCE 2014, 2014.[Abstract]

Non conventional sources of energy are those which are depleting day by day. Solar energy which is abundant in India has gained more importance hence. The energy produced by the sun, is harnessed with the help of PV panels and injected to converters and rectifiers. It is subsequently fed to an inverter that produces an AC power. In this paper, a PV panel fed modified dual output SEPIC converter is proposed. Dual outputs obtained from the modified multi output SEPIC converter is used to charge two batteries which in turn are fed to the cascaded multilevel DC/AC inverter. The simulation analysis of the system proves that it is well suited for both resistive and inductive loads; hence it is proposed for driving a motor load in rural areas agricultural applications. This system can be deployed in areas where grid connection is not possible such as in isolated or rural areas.

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V. Sailaja, E. Harshan, R., Voleti, A., and Reddy, B., “Battery charging using induction motor's Slip power”, in 2014 International Conference on Electronics, Communication and Computational Engineering, ICECCE 2014, Hosur, India, 2014.[Abstract]

Mankind is facing major issues, power shortages is one among them. Instead of going for installations of new power houses substantial use of wastage power can reduce the intensity of the issue. Industries contribute major part of the load in any grid. There will be huge power losses in industrial applications. So, efficient installations of power recovery systems as a part of demand side management will reduce these power shortages to some extent. Almost all industries run on three phase Induction motor which is widely used. In Slip ring Induction motor, rotor terminals are available. Many speed control techniques have been developed because of this facility. One among them is Slip power recovery scheme in which the slip power is recovered and given back to supply. However, when the machine ratings are small to permit such an expensive and complex converters, it is more practicable to recover the slip energy and charge a small battery bank and use it for UPS to feed lighting other low power loads. This proposed work presents a model to use this slip power to charge a battery instead of giving it back to the supply. In this model the motor's rotor winding is connected to a rectifier via slip rings. Power from the rotor winding flows through the three phase rectifier to a switch-mode step up DC to DC converter to re-charge a bank of batteries. A dynamic model of the complete system is presented along with simulation results and hardware implementation.

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