Dr. Vijayakumari A. currently serves as Assistant Professor at Department of Electrical and Electronics Engineering, School of Engineering, Coimbatore Campus. Her areas of research include Power Electronics and Renewable Energy.


Publication Type: Journal Article
Year of Publication Publication Type Title
2016 Journal Article A. Vijayakumari, Devarajan, A. T., and Mohanrajan, S. R., “Power angle control of a single phase grid connected photovoltaic inverter for controlled power transfer”, Advances in Intelligent Systems and Computing, vol. 397, pp. 451-461, 2016.[Abstract]

This paper focuses on the design and development of a 500 W, single phase single stage low-cost inverter for the transfer of direct current (DC) power from the solar photovoltaic (SPV) panel to the grid while meeting the standards for interconnection. The power transfer from SPV to grid is facilitated by controlling the angle between the inverter voltage and the grid voltage i.e. the power angle or phase angle (δ). Simulation of the single stage inverter for a power rating of 500 W is implemented in MATLAB/Simulink. The synchronization of the inverter with the grid was carried out by monitoring the grid frequency continuously and updating it. The power transferred to the grid is made equal to the available power by moni- toring and updating δ. A pulse-width modulation (PWM) control is implemented using PIC16F877 microcontroller for the inverter so as to deliver the available power from the solar panel to the grid, as well as, make the frequency of the output voltage of the inverter equal to the grid frequency for sustaining the synchronization.

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2016 Journal Article A. Vijayakumari, Devarajan, A. T., and Devarajan, N., “Extraction of photovoltaic (PV) module’s parameters using only the cell characteristics for accurate PV modeling”, Advances in Intelligent Systems and Computing, vol. 397, pp. 265-276, 2016.[Abstract]

This paper presents a method for extraction of the model parameters pertaining to a commercially available PV module, which can be used to develop an accurate PV model that can serve as a source for simulation studies of both grid-connected and stand-alone PV systems. All the physical parameters required for the PV model are determined only from the published V-I characteristics of the module and the standard cell equation. A curve fitting based extraction technique is proposed to obtain the parameters pertaining to a particular PV module available in the market. The extracted parameters are used and a simulation model of the PV module is developed in MATLAB/Simulink. The inputs to the model are irradiance, ambient temperature, number of series and parallel modules in an array as required in an application. A 115 W commercial module S115 is taken for verification, and its physical parameters are extracted and its simulation model is developed. The characteristics of the developed model with the extracted parameters, for several G and TC are presented and compared with the published data of S115 and com- pliance confirmed. The model has been tested for sudden changes in irradiance and temperature using a maximum power point tracker. © Springer India 2016.

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2014 Journal Article K. Deepthi, Vijayakumari, A., and Joshy, A., “Control of grid connected inverter with PR controller and LCL filter for interfacing renewable energy sources”, Advanced Materials Research, vol. 984-985, pp. 979-989, 2014.[Abstract]

This paper presents a design procedure for Proportional-Resonant (PR) controller and a third order LCL filter which decide the performance of the converter that is used to interface the renewable energy source to the grid. The primary focus of the paper is to evaluate the performance of the controller with the filter for a microgrid application. A scaled down model of microgrid available in the department laboratory is considered for he performance evaluation of the esigned controller. The system is simulated with a 2kVA PWM inverter and tested under onditions such as change in grid impedance, grid frequency and step change in reference current. The simulation results show that the PR controller with LCL filter tracks the reference with zero steady state error and the controller is found to be immune to grid frequency and micro-grid configure tion changes. © (2014) Trans Tech Publications, Switzerland.

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