Power Research

M. Kavya ¹, J. Sundara Rajan ¹, Rashmi ², R. R. N Sailaja ³

Affiliations
1 Central Power Research Institute, Bangalore - 560080, Karnataka, IN
2 Department of Electrical and Electronics Engineering, Siddaganga Institute of Technology, Tumkur - 572103, Karnataka, IN
3 Department EET Department, The Energy and Research Institute, Bangalore - 560071, Karnataka, IN

Abstract

This paper discusses correlation between results of electric and magnetic field simulation using Finite Element Method (FEM) and laboratory measurements of electromagnetic shielding effectiveness. The study shows that the addition of the MWCNT filler to HDPE base matrix tends to increase the electrical conductivity and helps in reduction of the Electromagnetic field in terms of radiated emission. With the increase in the weight percentage of MWCNT filler, improvements in terms of reduction in electromagnetic field is achieved. Addition of nano nickel to the HDPE improves the shielding efficiency. The results of this study has helped in achieving the optimum filler concentration in HDPE nano composite for improved EMI Shielding effectiveness

Keywords

Finite element method, electromagnetic interference, electrical conductivity, nano composites, EMI shielding effectiveness

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P. K. Chandrashekhar ¹, S. G. Srivani ², S. Shyam Sundar ³, Rashmi ⁴

Affiliations
1 Senior Research Fellow, Power Systems Division, Central Power Research Institute, Bangalore – 560 080, Karnataka, IN
2 Associate Professor, Dept. of Electrical & Electronics Engg., R V College of Engineering, Bangalore – 560 059, Karnataka, IN
3 Engg. Officer. Gr.-4, Power Systems Division, Central Power Research Institute, Bangalore – 560 080, Karnataka, IN
4 Associate Professor, Dept. of Electrical & Electronics Engg.,Siddaganga Institute of Technology, Tumkur - 572 103, Karnataka, IN

Abstract

The power system is dynamic in nature and is constantly being subjected to disturbances. It enters into dynamic instability when there is an imbalance between generation and varying load demand which calls for use of Power System Stabilizer (PSS). PSS is a device which provides additional signal to the voltage regulator derived from speed deviation, excitation deviation and accelerating power for damping critical oscillations. The PSS used should be capable to produce appropriate stabilizing signals against a wide range of operating conditions and disturbances. For this purpose, a PSS based on fuzzy logic control under multi-operating conditions is proposed in this paper. The performance of Fuzzy Logic based PSS(FLPSS) applied to Single Machine Infinite Bus (SMIB) system is studied for three different operating conditions; nominal load, heavy load and fault condition in transmission line. For Fuzzy PSS, speed deviation and acceleration are taken as input. The system is simulated in SIMULINK platform and its dynamic response is analyzed for system without PSS and with PSS. The results are compared for system with Conventional PSS and Fuzzy Logic PSS.

Keywords

Automatic Voltage Regulator (AVR), Fuzzy Logic Controller (FLC), Power System Stabilizer (PSS), Single Machine Infinite Bus (SMIB)

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Rashmi ¹, Poornima ¹, B. M. Madhu ¹

Affiliations
1 Department of Electrical and Electronics, Siddaganga Institute of Technology, B. H. Road, Tumakuru – 572103, Karnataka, IN

Abstract

The material properties can be significantly changed, with the addition of low concentration of nanofillers. With the integration of two nanofillers into the epoxy matrix, new hybrid nanocomposites can be obtained to suit requirements of the high voltage applications by improving desired electrical, thermal and mechanical properties. Indeed, hybrid nanocomposites are the fastest growing areas of material research. In the present work, the feasibility of multi-scale hybrid nanocomposite for conductor core applications was discussed. Composite sheets were fabricated with a very low wt.% of Multi-Walled Carbon Nano Tube(MWCNT) with an average size of 6-13nm and Graphene Nanoplatelets (GNP) with a particle size of 15μm were mixed in to commercially available bisphenol-A epoxy resin reinforced with E-Glassfiber. A homogeneous epoxy-nanofiller mixture is obtained using mechanical stirring followed by slow pultrusion technique. The resulting MWCNT/GNP reinforced epoxy resin was used to fabricate hybrid nanocomposite sheets with 70 wt.% unidirectional Glass Fiber(GF) with density of 400 g/m2. The hybrid nanocomposite sections were processed using pultrusion technique. With this former process glass fiber-epoxy (70:30), GF-epoxy/MWCNT (70:28:2) and GF-Epoxy/ MWCNT/GNP (70:27:2:1, 70:26:2:2, 70:25:2:3) weight percent composite sections were obtained. Dielectric properties were studied using LCR meter in the frequency range from 10Hz to 8MHz and mechanical properties were investigated using Universal Testing Machine. The mechanical tests revealed that the addition of MWCNT improves the tensile strength, cross breaking strength and the GNP enhances the tensile elastic modulus of the hybrid composite sheets. Electrical properties such as dielectric constant and impedance were found to be improved with filler addition. Finally, this work seeks to address the need of hybrid nanocomposite core in high voltage applications and need to understand the changes in electrical and mechanical properties with the addition of hybrid nanofillers.

Keywords

Electrical and Mechanical Properties, Graphene Nano Platelets, GFRP Hybrid Nanocomposites, Multi Walled Carbon Nanotubes

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