Time filter

Source Type

Balasubramaniyan S.,Mailam Engineering College
Journal of Theoretical and Applied Information Technology | Year: 2014

This paper proposes an optimal location of FACTS devices in power system using Evolutionary algorithms. Using the proposed method, the location of FACTS controllers, their type and rated values are optimized simultaneously. From the FACTS family, series device Thyristor Controlled Series Compensator (TCSC), Shunt device Static Compensator (STATCOM) and series and shunt device Unified Power Flow Controller (UPFC) are considered. The proposed algorithms are very effective methods for the optimal choice and placement of FACTS devices to improve the power quality of power systems. The proposed algorithm has been applied to IEEE -30 bus system. © 2005 - 2014 JATIT & LLS. All rights reserved.

Ravisankar R.,Government of Tamilnadu | Sivakumar S.,Mailam Engineering College | Chandrasekaran A.,Vellore Institute of Technology | Prince Prakash Jebakumar J.,Indian National Institute of Engineering | And 3 more authors.
Radiation Physics and Chemistry | Year: 2014

Natural and artificial radionuclide pollutants of the marine environment have been recognized as a serious environmental concern. The natural radioactivity levels in beach sediment samples collected from Thazhankuda (Cuddalore) to Kodiyakkarai along East Coast of Tamilnadu have been determined. Sediment sample were collected by a Peterson grab sampler from 10m water depths parallel to the shore line. The grab sampler collects 10cm thick bottom sediment layer from the seabed along the 20 stations. The radioactivities of 20 samples have been measured with a NaI(Tl) detector. The average specific activities for 238U, 232Th, and 40K were found to be 3.67, 37.23 and 387.17Bqkg-1 respectively. The results have been compared with other radioactivity measurements in different countries. It shows that the average activity of 238U and 40K is lower whereas 232Th is slightly greater than the compared worldwide average value. The radiation hazard due to the total natural radioactivity in the study area was estimated by different approaches such as the radium equivalent activity (Raeq), absorbed dose rate (DR), hazard indices, the annual gonadal dose equivalent (AGDE) and annual effective dose equivalent (AEDE) are compared with the international recommended values. Multivariate Statistical analyses (Pearson Correlation, Cluster and Factor analysis) were carried out between the parameters obtained from the radioactivity to know the existing relations and to study the spatial distribution of radionuclide. © 2014 Elsevier Ltd.

Ramalingam M.,Mailam Engineering College
European Journal of Scientific Research | Year: 2012

In the art of utilizing the web services/ resources, authorization plays more vital role. A semantic-aware access control mechanism assures to provide an access right to the authorized users. Few access control models consider the rich semantic relations between the requested service as well as the availing services. However, they offer only coarsegrained access, which will not filter out the services that do not met both the service providers' policies as well as the users' policies. To solve the issues, a new framework is proposed in this paper. The framework is comprised of two separate ontologies to maintain the semantic information of policies that are submitted by users and service providers and the semantic information of services, a service locator for identifying the exact services and an access control engine for offering access to the users. The framework is implemented and its performance is analyzed using precision, recall and F-score measures. The measured values prove that the framework is effectual in offering fine-grained web services. © EuroJournals Publishing, Inc. 2012.

Muthukumar G.G.,Mailam Engineering College | Victoire T.A.A.,Anna University
2011 1st International Conference on Electrical Energy Systems, ICEES 2011 | Year: 2011

This paper demonstrates the control parameter optimization using a hybrid Differential Evolution (DE) - Adaptive Neuro-Fuzzy Inference System (ANFIS) technique for permanent-magnet brushless DC (BLDC) motor drive system ensuring deadbeat response. The parameter settings are further used in adaptive current and speed controllers to attain the objective in a BLDC drive system. The parameters of both inner-loop and outer-loop PI controllers, which vary with the operating conditions of the system, are adapted in order to maintain deadbeat response for current and speed. The ANFIS is modeled using the evenly distributed operating points selected within preset regions of system loading. The optimized data from DE are used to train the ANFIS that could deduce the controller parameters at any other loading condition within the same region of operation. © 2011 IEEE.

Periyaazhagar D.,Bharath University | Irusapparajan G.,Mailam Engineering College
International Journal of Modelling, Identification and Control | Year: 2016

This paper represents the comparison of carrier-based bipolar pulse width modulation technique such as phase disposition, phase opposition disposition, alternating phase opposition disposition, carrier overlapping and variable frequency for the choice of three phase nine level cascade multilevel inverters. In this paper, cascade multilevel inverter topology with a multiconversion cell consists of two unequal voltage sources and it produces nine level output voltages at load terminal. Simulation results are performed by using MATLAB/Simulink. It indicates that alternating phase opposition disposition pulse width modulation provides higher output voltage with less harmonic distortion for all pulse width modulation techniques. It is also observed that the carrier overlapping pulse width modulation technique provides higher fundamental RMS output voltage for all pulse width modulation techniques. Copyright © 2016 Inderscience Enterprises Ltd.

Discover hidden collaborations