Performance Evaluation of Distribution System Using Shunt Capacitor, SVC and STATCOM

Vol. 2  Issue 1
Year: 2014
Issue:Feb-Apr
Title:Performance Evaluation of Distribution System Using Shunt Capacitor, SVC and STATCOM
Author Name:Shekhappa G. Ankaliki,Rashmi Kannur,Shridevi Narasannavar and Arathi Sunkara
Synopsis:

This article presents performance evaluation of real time radial distribution system with different compensating devices. The performance of real time radial distribution system was investigated using real time distribution system data with different compensating devices for different operating conditions. The performance evaluation of distribution system is analyzed by placing shunt capacitor, SVC and STATCOM independently; voltage profile and total losses are compared under different system operating conditions. To demonstrate the effectiveness of the proposed method, a 110/11KV distribution substation is selected for analyzing the performance and results are presented.

Control of DC link voltage in an OWC based WEC system for standalone application

Vol. 2  Issue 1
Year: 2014
Issue:Feb-Apr
Title:Control of DC link voltage in an OWC based WEC system for standalone application
Author Name:Vinatha U and Santosh B 
Synopsis:

Due to dwindling of fossil fuels and other non renewable energy resources, there has been a considerable advancement in field of renewable energy resources. Renewable energy provides a more stable source of power which is constantly replenished and infinite. The power obtained from the renewable sources depends on the geographical conditions which are varying, hence results in variable power generation. Power electronic converters play a very important role in obtaining a constant power from the renewable resources. In this paper studies on Oscillating Water Column (OWC) based Wave Energy Conversion System (WECS) has been carried out. The work involves the modeling of system, control of the dc and ac voltage for standalone application. The controllers are designed to regulate the voltage and address certain power quality issues.

Load Frequency Control Of Two Area Power System in Deregulated Environment Using Pi Controller

Vol. 2  Issue 1
Year: 2014
Issue:Feb-Apr
Title:Load Frequency Control Of Two Area Power System in Deregulated Environment Using Pi Controller
Author Name:Ajitha Priyadarsini.S and P.Melba Mary 
Synopsis:

In this paper load frequency control (LFC) of two area power system in deregulated environment using PI controller was studied. A two area system is considered in which all areas are interconnected by normal AC tie-lines. In each area there are two GENCOs and two DISCOs. DISCOs can buy power from GENCOs in their own area or from other areas. In the proposed system the effects of bilateral contracts between DISCOs and GENCOs are also considered. The performance of the PI controller is tested on a deregulated two area load frequency control system for different operating conditions using MATLAB Simulink tool. The results show that performance of PI controller is effective in reducing steady state error.

Power Quality Improvement in a Grid Connected Single Stage PV Generating System by integrating Shunt Active Filter for both connection of PV cells and power Quality Improvement

Vol. 2  Issue 1
Year: 2014
Issue:Feb-Apr
Title:Power Quality Improvement in a Grid Connected Single Stage PV Generating System by integrating Shunt Active Filter for both connection of PV cells and power Quality Improvement
Author Name:P. V. Ramkumar and M. Surya Kalavathi
Synopsis:

This paper presents a method of integrating Active Power Filter (APF) in Photo Voltaic(PV) system. Distributed Generation (DG) concept is attracting the attention of power sector engineers throughout the world due to its technical, economical and environmental benefits. Among the various possibilities of DGs, photovoltaic (PV) systems have drawn prominent attention In spite of their high cost and poor conversion efficiency. Power quality issues such as harmonics, are inevitable in such distribution system which must be sorted out. Separate Passive/Active Filters can be used for this purpose. However single VSI Converter can be made used for processing and connecting PV energy to system as well as for power Quality improvement of the whole system. This reduces the complexity and cost of the system significantly. The proposed PV System with single converter acting as APF is not only able to track the maximum power point of the photovoltaic energy but also compensate harmonic currents from the grid line and correct the power factor. Peak detection method of control strategy is employed in APF for power quality improvement. P&O algorithm is used for achieving Maximum Power Point Tracking of the PV generator. The proposed system of APF embedded in PV system is simulated using MATLAB/SIMULINK and tested for power quality improvement under the maximum Power Point Tracking of PV generator.

Development of Power Flow Controller for Grid Connected Renewable Energy Sources Using Lyapunov function

Vol.1  No.4

Year: 2014

Issue : Nov-Jan

Title : Development of Power Flow Controller for Grid Connected Renewable Energy Sources Using Lyapunov function

Author Name : Kalaiselvi K, Sowthamani R

Synopsis :

The three phase inverter is proposed to control the active and reactive power flow from the renewable energy source to a three phase generalized micro grid system. The proposed control system not only controls the grid power flow but also reduces the grid current total harmonic distortion in the presence of typical nonlinear loads. The control system shapes the grid current taking into account the grid voltage unbalance, harmonics as well as unbalance in line side inductors. The stability of the control system is ensured by the direct method of Lyapunov. SRC is also proposed to improve the performance of the current controller by estimating the periodic disturbances of the system. The proposed control system (implemented digitally) provides superior performance over the conventional multiple proportional-integral and proportional-resonant control methods. A new inverter modelling technique is also presented to take care of unbalances both in grid voltages and line side inductors.

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A High Speed Low Power CAM with Power-Gated Match Line Sensing Using Keyword-Based Search Method

Vol.1  No.4

Year: 2014

Issue : Nov-Jan

Title : A High Speed Low Power CAM with Power-Gated Match Line Sensing Using Keyword-Based Search Method

Author Name : Shanmugapriya M, Shenbagapariya M

Synopsis :

The design of high speed Content Addressable Memory (CAM) offers high-speed search function in a single clock cycle. Content Addressable Memory (CAM) is a type of solid-state memory in which data are accessed by their contents rather than physical locations. It receives input search data, i.e., a search word, and returns the address of a similar word that is stored in its data-bank. In previous system, we introduced a parity bit that leads to sensing delay and increase the power consumption. It takes more time to sense the match line. In this paper, we used keyword based search method. The concept of this method is to pre-compare several bits of the match line in advance. Through the mechanism of the keyword search pre-comparison scheme, it can decide that whether the other bits would be compared or not and which reduces even more sensing delay and reduce the power.

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Investigation and Analysis for Effectiveness of Various Types of Reflectors in Boasting the Output of Solar Photovoltaic Panel

Vol.1  No.4

Year: 2014

Issue : Nov-Jan

Title : Investigation and Analysis for Effectiveness of Various Types of Reflectors in Boasting the Output of Solar Photovoltaic Panel

Author Name : Md. Khademuzzaman, Nilufer Akter , Ruhul Amin

Synopsis :

Various methods have been practiced for boasting up the output of solar photovoltaic module. Tracking more sun rays on solar PV panel is one of the effective schemes for increasing up the output. This sun tracking can be possible though automatic sun tracker or reflection methods. Comparatively the reflection method has more simplicity in mechanism than automatic tracker. Tracking more sun rays with reflection process provided satisfactory result. In dealing with reflection method we have found various types of reflectors like white foam reflector, standard reflector, aluminum reflector etc. In this paper, we have demonstrated the effectiveness of various reflectors on solar PV panel at different angles. From this analytical paper we can determine the effective reflector to increase the output of solar PV panel.

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