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Kākināda, India

Vijay Kumar Y.N.,SVCET | Sivanagaraju S.,UCEK | Suresh C.V.,Vasireddy Venkatadri Institute of Technology
Ain Shams Engineering Journal | Year: 2015

The utilization of electrical energy due to urbanization and industrialization is increasing day by day, and due to this, there is chance of increasing the uncertainties in a given power system and that affects the economy of the country. The conventional power system in the presence of flexible AC transmission system (FACTS) controllers is an alternative to solve this problem and can increase the power system capability to handle rapid changes in operating conditions of the system. In general, multi-line FACTS controllers are effective than single line FACTS controllers. In this paper, a detailed mathematical modeling of IPFC is presented and the effect of an optimal location is also analyzed. A novel optimization algorithm i.e. modified BAT algorithm is proposed to solve optimal power flow problem in the presence of IPFC including system constraints and device limits. The proposed methodology has been tested on standard test systems. © 2015 Faculty of Engineering, Ain Shams University. Source

Suresh C.V.,Vasireddy Venkatadri Institute of Technology | Sivanagaraju S.,UCEK | Veera Reddy V.C.,AITS
Ain Shams Engineering Journal | Year: 2015

Power system security analysis plays key role in enhancing the system security and to avoid the system collapse condition. In this paper, a novel severity function is formulated using transmission line loadings and bus voltage magnitude deviations. The proposed severity function and generation fuel cost objectives are analyzed under transmission line(s) and/or generator(s) contingency conditions. The system security under contingency conditions is analyzed using optimal power flow problem. An improved teaching learning based optimization (ITLBO) algorithm has been presented. To enhance the system security under contingency conditions in the presence of unified power flow controller (UPFC), it is necessary to identify an optimal location to install this device. Voltage source based power injection model of UPFC, incorporation procedure and optimal location identification strategy based on line overload sensitivity indexes are proposed. The entire proposed methodology is tested on standard IEEE-30 bus test system with supporting numerical and graphical results. © 2015 Faculty of Engineering, Ain Shams University. Source

Velpula V.B.,Alstom | Krishna Prasad M.H.M.,UCEK
Advances in Intelligent Systems and Computing | Year: 2016

With the enhanced usage of sensors and GPS devices, obtaining spatial and spatio-temporal data has become easy and analyses of these data in real-time applications are increasing day to day. Clustering is a data mining technique used for analyzing and obtaining unknown/hidden knowledge from the data/objects. Distance-based methods are helpful for analyzing and grouping the objects. In general, based on the type of data, Euclidean or Cosine distance-based techniques are used for grouping the data. Traditional techniques are point-based techniques and are based on single-view point, which may not produce efficient information and cannot be utilized for analyzing spatio-temporal objects. Hence, this paper presents a novel multi-view similarity technique for clustering spatio-temporal objects. Authors demonstrated the effectiveness of the proposed technique by adopting DBSCAN and implementing JDK1.2 on benchmarked datasets with respect to FMI indicator. © Springer India 2016. Source

Darimireddy N.K.,Lendi Institute of Engineering and Technology | Mallikarjuna Prasad A.,UCEK
Journal of Applied Research and Technology | Year: 2015

Many techniques have been proposed to design microstrip patch antennas with multiband characteristics. In the proposed antenna design, a combination of dual U-slot and multiple layers is used to get multiple bands and wide bandwidth. A multiband triple-layer probe fed double U-slot microstrip patch antenna for next generation wireless applications is proposed in this paper. Parametric studies of antenna structure with double U-slot, variation of feed position, and also with multiple layers are presented. The proposed antenna is fabricated and tested. The simulation and experimental results are presented. The proposed antenna provides triple bands at 1.6 GHz, 1.9 GHz and 3.8 GHz and a bandwidth of 600 MHz for a substrate thickness of 1.6 mm and 1.8 GHz, 2.2 GHz and 4.8 GHz and a bandwidth of 800 MHz for a substrate of 0.6 mm thickness. © 2015 Universidad Nacional Autónoma de México, Centro de Ciencias Aplicadas y Desarrollo Tecnológico. Source

Darimireddy N.K.,JNTUK | Prasad A.,UCEK
Lecture Notes in Electrical Engineering | Year: 2016

A miniature and low profile frequency dependent and frequency independent microstrip patch antennas are proposed in the paper. An idea of converting frequency dependent microstrip patch into frequency independent microstrip patch by altering the dimensions, relative spacing and with suitable arrangement of parasitic patches is presented and discussed. The performance analysis and design details of frequency dependent and frequency independent patch antennas are presented in the paper. To determine the mathematical calculations of critical microstrip patch dimensions and the corresponding optimized design of both antennas was carried out using Ansys HFSS solver. The parametric studies with respect to various substrate materials, substrate thickness and some design parameters of both the antennas are simulated and presented in the paper. The proposed antennas are fabricated and tested. The Simulation and Experimental results are compared. Based on these results, the proposed antennas operate in UWB (3.1–10.6 GHz) range of frequencies. © Springer India 2016. Source

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