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Mangai K.A.,VelTech Hightech Engineering College | Priya M.,Saveetha Engineering College | Rathnakumari M.,Velammal Engineering College | Sureshkumar P.,Velammal Engineering College
Journal of Applied Spectroscopy | Year: 2014

Strontium ferrite enjoys a high degree of chemical stability and is completely nontoxic, which makes it ideal for a wide range of applications. Magnetoplumbite-type (M-type) hexagonal strontium ferrite particles were synthesized via the sol-gel technique employing ethylene glycol as the gel precursor. The phase morphology, particle diameter, and magnetic properties of the prepared samples were studied using X-ray diffractometry (XRD), scanning electron microscope (SEM), and a vibrating sample magnetometer (VSM), respectively. The effect of temperature on the crystal structure, morphology, and magnetic studies were carried out. Also, the thermal decomposition of assynthesized powdered samples has been studied by thermogravimetric (TG) and differential thermal analysis (DTA) methods. The optical properties were analyzed using fluorescence spectra. The XRD results showed that the samples synthesized at 600°C, 800°C, and 1000°C were of single phase and smaller crystallite size. The intensity of the emission spectra of strontium ferrite was also examined. The yield percentage along with structure determination and VSM studies of the prepared samples are discussed in detail. © 2014 Springer Science+Business Media New York. Source

Sivakumar R.,Priyadarshini Engineering College | Raja C.,Archana Institute of Technology | Banu Priya P.,VelTech Hightech Engineering College
International Journal of Applied Engineering Research | Year: 2015

This concept represents an AC-to-AC conversion for voltage and current control scheme with instantaneous reactive power minimization also reduce the harmonics for high power applications in a distorted AC power supply. The strategy uses the commutation state of the converter in the subsequent sampling time according to an optimization algorithm given by a simple cost function and the discrete system model. Using this model, harmonics in the input current generated by the resonance of the input filter and output filter are strongly reduced. By using bidirectional converter will reduce the reactive power by connecting the capacitors at the both side of control unit. © Research India Publications. Source

Shajan D.,VelTech Hightech Engineering College | Murugasen P.,Saveetha Engineering College | Sagadevan S.,University
Digest Journal of Nanomaterials and Biostructures | Year: 2016

Borate glasses were synthesized by the conventional rapid melt quench method. The XRD pattern confirmed the amorphous nature of borate glass. Optical properties of borate glass were studied using the Photoluminescence spectrum. IR spectrum was analyzed to determine and differentiate the various vibrational modes in the structural changes. Raman spectroscopy of borate glass was also carried out. According to TGA/ DTA and DSC analysis, decomposition pattern had been formulated to account for the weight losses observed. The dielectric properties such as the dielectric constant, the dielectric loss, and AC conductivity of the borate glass were studied in the different frequencies and temperature. © 2016, Inst Materials Physics. All right reserved. Source

Ajitha A.,Vel Technology University | Mutharasan A.,VelTech Hightech Engineering College | Dhal P.K.,Vel Technology University
International Journal of Applied Engineering Research | Year: 2015

Electric power generation in the mere future rely on renewable energy sources such as wind, solar, wave etc. Wind is the major resource and most available. In wind power Industry, the power quality issues such as fault ride through- Sag and Swell are still a concern. This paper gives a highly efficient single stage energy conversion device called Matrix Converter which provides a constant frequency at the output is employed along with Unified Power Flow controller to improve Power quality. The UPFC is the most versatile and complex power electronic equipment that has emerged for the control and optimization of power flow in electrical power transmission system. Its main function is to control the voltage, phase angle and impedance of the power system thereby modulating the line reactance and controlling the power flow in the transmission line, thereby helps to improve the power quality. © Research India Publications. Source

Mutharasan A.,VelTech Hightech Engineering College | Niranjan Kumar R.,Sri Krishna College of Engineering And Technology | Rameshkumar T.,VelTech Hightech Engineering College | Ajitha A.,Veltech Rangarajan Drsakunthala R And D Institute Of Science And Technology
International Journal of Applied Engineering Research | Year: 2014

In this paper we discuss about the power quality analysis for matrix converter. The proposed system consists of a Shunt Active Filter which improves the power quality by eliminating the Total Harmonics Distortion. Normally the Matrix Converter itself injects significant harmonics to the existing system. In proposed system the approach will completely remove the Total Harmonics Distortion & reduce the effect, which increase the Power Quality. The methodology has been tested and verified using the Mat lab/ Simulink. © Research India Publications. Source

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