Qualification: 
M.Tech, B-Tech
divyarnair@am.amrita.edu

Divya R. currently serves as Assistant Professor (Senior Grade) at the Department of Electrical and Electronics Engineering at Amrita School of Engineering, Amritapuri. Divya R. has completed B. Tech. in EEE  from College of Engineering, Perumon, in the year 2004 and M. Tech. in Power Electronics from Amrita School of Engineering, Ettimadai in the year 2008.

Publications

Publication Type: Conference Paper

Year of Publication Publication Type Title

2017

Conference Paper

V. Raveendran, R. Divya, Chandran, P. C. S., and Dr. Manjula G. Nair, “Smart Level 2 DC Electric Vehicle Charging Station with Improved Grid Stability Sand Battery Backup”, in 2017 International Conference on Technological Advancements in Power and Energy ( TAP Energy), 2017.[Abstract]


The population of Electric Vehicle (EV) is tremendously increasing with the increase in fuel price and decrease in availability. As the number of EV increases, along with that the number of EV charging stations should also increase, which constitute a considerable charging impact on the grid from which the supply is taken. In this paper, in order to reduce this charging impact and its after effects, a topology for EV charging station is proposed which also promote the use of EVs. The proposed topology mainly consists of a charging station powered by the grid as well as the storage integrated solar PV system and a controller. The grid dependency of the charging station is reduced by using a renewable energy source (Solar PV) and for improving the system reliability a Battery Energy Storage System (BESS) is incorporated. The control technique helps to reduce the charging impact on the grid by controlling the charging current as per the system conditions. To make the EV Charging Station (EVCS) more customized, three different options (Quick, Green and Budget) for charging are given such that the customer is free to choose one among them according to his requirement. The cost of charging will vary according to the selected mode of charging. A smart Electric Vehicle charging station is designed and the charging current control in various grid conditions are tested and verified by u sing MATLAB Simulink model and the obtained results are included.

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2017

Conference Paper

R. Divya, Nandukrishnan, S. M., and Dr. Manjula G. Nair, “Hardware Implementation of Power Sharing and Power Quality Improvement for Grid Integration of Microgrid”, in 2017 International Conference on Technological Advancements in Power and Energy ( TAP Energy), 2017.[Abstract]


Microgrid is an integration platform for supply-side, storage units and demand resources located in a local distribution grid. A microgrid is typically located at the low voltage level with total installed micro generation capacity below the MW range. A microgrid should be capable of handling both normal state (grid-connected) and emergency state (islanded) operation In this paper the integration of two microgrids with a main grid is discussed along with methods for reduction of various the power quality issues such as harmonics produced by the nonlinear loads using power quality methods. There numerous filtering techniques that are used for the reduction of harmonic issues, which includes IcosΦ, synchronous reference frame, synchronous detection etc. In this paper the integration of main grid with two microgrids were simulated with improved power quality by using modified IcosΦ algorithm. Based on the obtainability of power in each microgrid and the tariffs a MATLAB program was developed based on which the switching of the two microgrids will. It was found that the THD values where reduced and the microgrids were able to switch between each other based on the obtainability of power and the tariff. The results are obtained in MATLAB Simulink and the THD values are measured and power quality issues were found to be reduced. Hardware has been implemented in analog system and results were observed.

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2014

Conference Paper

V. Vijayakumar, R. Divya, and A. Vivek, “Sliding mode controlled quadratic boost converter”, in International Conference on Computation of Power, Energy, Information and Communication (ICCPEIC), 2014 , Chennai, 2014.[Abstract]


This paper deals with a quadratic boost converter which belongs to cascade boost family, controlled by sliding mode controller. In the cascade boost family, quadratic boost converter is the best trade-off when circuit complexity and modulator saturation is considered. Sliding mode control being a nonlinear control results in a robust and stable system when applied to switching converters which are inherently variable structured systems. The stability of this system is analysed through Lyapunov's approach. Analysis is done for load regulation, line regulation and step response of the system on Simulink model. Also these results are compared with that of PID controller based system.

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2014

Conference Paper

R. Divya, “Bi-Directional DC/DC Converter with PFM/PWM Controller Implementing Soft-Switching”, in International Conference, 2014.

2013

Conference Paper

A. Aa Anu and R. Divya, “Multiple input DC-DC converters for solar cell power supply system and its maximum power point tracker”, in 2013 International Conference on Energy Efficient Technologies for Sustainability, ICEETS 2013, Nagercoil, 2013, pp. 287-290.[Abstract]


Recently environmental problems have attracted great attention on a worldwide scale. Therefore, the exploitation of clean-energy resources such as solar arrays, wind generators, fuel cells, and so forth has been concretely attempted. In this case, a multiple-input dc-dc converter is useful to combine the several input power sources and to supply the regulated output voltage for the load from the power sources. This paper proposes the new boost type two input dc-dc converter, in which a solar array and a commercial ac line are exploited as two input power sources and are combined by two input windings of the energy-storage reactor. Its operational characteristics and maximum power point is tracked and verified through matlab simulink. © 2013 IEEE.

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2012

Conference Paper

R. Divya, Nambiar, A., Raveendran, M., Mohan, N. P., and Sampath, S., “Mitigation of power quality issues using DSTATCOM”, in International Conference on Emerging Trends in Electrical Engineering and Energy Management (ICETEEEM), 2012, Chennai, 2012, pp. 65-69.[Abstract]


In this paper, the role of FACTS (Flexible AC Transmission System) devices in addressing various power quality issues has been studied. In FACTS, power electronic devices and their switching control schemes are used for improving the power flow in the transmission network and hence improve the power quality and reliability of the low-voltage distribution network. These devices can play a significant role in maximizing the power transmission capability of the transmission networkand providing high power quality at the point of common coupling (PCC) of the distribution system. The Distributed Static Compensator or DSTATCOM is a type of FACTS controller and has the function of reactive power compensation and harmonic mitigation. This paper discusses the use of synchronous detection algorithm for implementation of DSTATCOM for mitigation of harmonics. The dynamic performance is analyzed and verified through simulation.

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2010

Conference Paper

R. Divya, “Design of shunt active filter using synchronous detection algorithm”, in National Conference Cutting Edge Technologies in Power Conversion and Industrial Drives, 2010.

Publication Type: Journal Article

Year of Publication Publication Type Title

2013

Journal Article

K. M. Namitha and R. Divya, “Design and Analysis of Zero Voltage Transition Interleaved Boost Converter for High Power Applications”, Proceedings of National Conference on Technological Advancements in Power and Energy, 2013.[Abstract]


This paper presents the design and performance of a dc to dc interleaved boost converter with zero voltage transition. A soft-switched interleaved boost converter composed of two-cell shunted boost conversion units and an auxiliary inductor is presented and simulations are done in Matlab/simulink. The converter is able to turn on both the active power switches of the shunted boost units at zero voltage to reduce their switching losses and raise the conversion efficiency. The circuit is operated at different power outputs to evaluate its efficiency. The efficiency at different power outputs was found to be between 90% to 95% due to its zero voltage switching characteristics.

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