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Lalitha M.P.,Annamacharya institute of Technology and science | Reddy V.C.V.,A.P.S. University | Usha V.,A.P.S. University
Journal of Theoretical and Applied Information Technology | Year: 2010

This paper presents a new methodology using Particle Swarm Optimization(PSO) for the placement of Distributed Generators(DG) in the radial distribution systems to reduce the real power losses and to improve the voltage profile. A two-stage methodology is used for the optimal DG placement. In the first stage, single DG placement method is used to find the optimal DG locations and in the second stage, PSO is used to find the size of the DGs corresponding to maximum loss reduction. The proposed method is tested on standard IEEE 33 bus test system and the results are presented and compared with an existing method. © 2005 - 2010 JATIT. All rights reserved.

Sridevi T.,Jawaharlal Nehru Technological University | Reddy K.R.,G Narayanamma Institute Of Technology And Science | Syamala N.L.J.,Annamacharya institute of Technology and science
Proceedings of 2013 International Conference on Power, Energy and Control, ICPEC 2013 | Year: 2013

This paper presents, analysis of magnetizing inrush current for different voltage angles and harmonic analysis of that inrush current using different FFT windowing techniques. Time domain simulations were used to solve the inrush phenomenon. Square, Welch, Hanning and Parzen windows were used to truncate the obtained inrush current harmonic spectrum for investigation and with parzen windowing the harmonic magnitude is getting reduced due to its reduced side lobes. Inrush current harmonic spectrum obtained by using FFT algorithm in turn discrete fourier transform. Out of different solvers to solve state equation, ode23t solver is used. For an unloaded single phase transformer, inrush current in time domain and harmonic content of inrush current were presented. The results are helpful to estimate harmonics effects in the transformer inrush currents. The results establish a guide line for harmonic elimination due to inrush current and offer an important reference for system design. © 2013 IEEE.

Suresh Babu P.,Annamacharya institute of Technology and science
International Journal of Applied Engineering Research | Year: 2015

This paper presents a method of maximum power point tracking, MPPT using adaptive fuzzy logic control for grid connected photovoltaic system. The system composed of photovoltaic module, boost converter and the fuzzy logic controller. The maximum power point tracking control is based on adaptive fuzzy logic to control ON/OFF time of MOSFET switch of boost converter. The complete simulation results using Simulink software for the whole system containing the PV array, boost converter, and fuzzy controller were presented. The control strategy for the boost converter and the whole system is carried out by using field programmable gate array (FPGA). © Research India Publications.

Lin A.Y.-C.,National Taiwan University | Panchangam S.C.,Annamacharya institute of Technology and science | Tsai Y.-T.,National Taiwan University | Yu T.-H.,National Taiwan University
Environmental Monitoring and Assessment | Year: 2014

The current article maps perfluoroalkyl acids (PFAAs) contamination in the largest Science Park of Taiwan. The occurrence of ten target PFAAs in the effluent of an industrial wastewater treatment plant (IWWTP), its receiving rivers, rainwater, sediment, and the muscles and livers of fish was investigated. All target PFAAs were found in effluent of IWWTP, in which perfluorooctane sulfonate (PFOS) (6,930 ng/L), perfluorohexyl sulfonate (PFHxS) (2,662 ng/L) and perfluorooctanoic acid (PFOA) (3,298 ng/L) were the major constituents. Concentrations of PFBS and PFOS in the IWWTP downstream areas have exceeded safe concentration levels of avian and aquatic life, indicating a potential risk to wildlife in those areas. In sediment samples, predominant contaminants were PFOS (1.5-78 ng/g), PFOA (0.5-5.6 ng/g), and perfluorododecanoic acid (PFDoA) (nd-5.4 ng/g). In biological tissue samples, concentrations as high as 28,933 ng/g of PFOS were detected in tilapia and catfish liver samples. A positive correlation for log (C sediment/C water) and log (C tissue/C water) was found. The concentration and proportion (percentage of all PFAAs) of PFOS found in biotissue samples from the Keya River (which receives industrial wastewater) were found to be much greater (200 times) than those of samples from the Keelung River (which receives mainly domestic wastewater). These findings suggest that the receiving aquatic environments and, in turn, the human food chain can be significantly influenced by industrial discharges. © 2014 Springer International Publishing Switzerland.

Vadivelu K.R.,Annamacharya institute of Technology and science | Marutheswar G.V.,Andhra University
Journal of Electrical Systems | Year: 2015

This paper proposed an application of New Voltage Stability Index(NVSI) to Reactive Power Planning(RPP) using Soft Computing Technique based Differential Evolution(DE).NVSI is used to identify the weak buses for the Reactive Power Planning problem which involves process of experimental by voltage stability analysis based on the load variation. The Formulation of a New Voltage Stabilty Index(NVSI),which is originates from the equation of a two bus network,neglecting the resistance of transmission line,resulting in appreciable variations in both real and reactive loading.The proposed approach has been used in the IEEE 30-bus system.Results show considerable reduction in system losses and improvement of voltage stability with the use of New Fast Voltage Stability Index for the Reactive Power Planning problem. © JES 2015.

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