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31,456 Article Results

Real Time Power Quality Phenomenon for Various Distribution Feeders

10.11591/ijeecs.v3.i1.pp10-16
C. Bharatiraja , Harish Chowdary V
Power Quality (PQ) brings more challenges to the large- scale and medium scale industries because in the recent years most of them use high efficiency and low energy devices which cause vulnerable PQ disturbances at Point of Common Coupling (PCC). In this paper, the measurement at different times during load condition and analysis of all types of disturbances occurred has been done. When large rated equipments run, the disturbance (harmonics, RMS variations, and switching transients) levels are very high and poor power factor (PF) has also appeared. Due to this poor PF, reactive power consumption in load increases and accordingly total power increases. An electronic device such as LED lights, fluorescent lamps, computers, copy machines, and laser printers also disturb the supply voltage. We are very well known that every PQ problem directly or indirectly must affect economically. Many researchers have investigated PQ audit for over three decades. However these studies and analysis have been done only at simulation level. Hence, the PQ analyzer based study is required to find out the PQ issues at distribution feeders. It will be a valuable guide for researchers, who are interested in the domain of PQ and wish to explore the opportunities offered by these techniques for further improvement in the field of PQ. This paper gives a brief Real Time PQ measurement using PQ analyzer HIOKI PW3198 at Distribution Feeders and it gives an idea to the researcher to optimize problems-related to PQ with respect to the high rated and low rated electric machinery of different feeders at PCC level. This study further extends to analyze the grid disturbances and looks forward to the optimization methods for each individual PQ disturbance.
Volume: 3
Issue: 1
Page: 10-16
Publish at: 2016-07-01

Design, Simulation and Fabrication of Band Pass Filter 308 MHz Narrow Bandwidth Using Technology Surface Mount Technology (SMT) on FMCW Radar Frequency Generators

10.11591/ijeecs.v3.i1.pp136-142
I Dewa Putu Hermida , Deni Permana Kurniadi , Iqbal Syamsu
Has been research a band pass filter with a steep slope the working frequency 308MHz with 4 MHz bandwidth used in navigation radar system. To overcome this, the design is done by using two filters are combined. Merger This filter consists of a single filter consisting of a low pass filter with a cutoff frequency that works at a frequency of 310 MHz, and a high pass filter with a cutoff frequency that works at a frequency of 306 MHz Type filter is used to generate the elliptic filter steepness better by ignoring the ripple in the pass band for narrow bandwidth. For a low pass filter, stop band width (Fs) approximately 20% of the cutoff frequency occurs at a frequency of 372 MHz, with stop band depth (As) of about -55 dB As for the high pass filter, stop band width (Fs) approximately 20% of the cutoff frequency that occurred at a frequency of 244.8 MHz, with stop band depth (As) of about -55 dB. The output filter is used as a clock on direct insert digital synthesizer (DDS). Using the components of surface mount technology (SMT), then the resulting circuit with its small dimensions, compact and has a high Q. Elsie used in the simulation stage software version 2.72, the manufacturing process using protel 99SE, and the stage of measurement using a vector network analyzer (VNA) Advantest R3770 type.
Volume: 3
Issue: 1
Page: 136-142
Publish at: 2016-07-01

Survey Smoothly Fiber-Wireless (FiWi) Accessing Wireless Networks: Convergence and Challenges

10.11591/ijeecs.v3.i1.pp151-156
Naseer Hwaidi Alkhazaali , Raed Abduljabbar Aljiznawi , Dheyaa Jasim Kadhim
 Traditionally, wireless networks and optical fiber Networks are independent of each other. Wireless networks are designed to meet specific service requirements, while dealing with weak physical transmission, and maximize system resources to ensure cost effectiveness and satisfaction for the end user. In optical fiber networks, on the other hand, search efforts instead concentrated on simple low-cost, future-proofness against inheritance and high services and applications through optical transparency. The ultimate goal of providing access to information when needed, was considered significantly. Whatever form it is required, not only increases the requirement sees technology convergence of wireless and optical networks but also played an important role in future communication networks. Some technical development of wireless access networks-optical and seamless coexistence of both techniques, this paper is a review of the State of the latest developments and advances in optical and wireless communications, major technical challenges to provide flawless communication in fiber- wireless (FiWi) access networks, places of interest important research issues to provide intelligence information, access and transport and the convergence of these networks in the future.
Volume: 3
Issue: 1
Page: 151-156
Publish at: 2016-07-01

An Energy Efficient Clustering Algrithm Based on DEEC Protocol and K-mean Method

10.11591/ijeecs.v3.i1.pp143-150
Elahmadi Cheikh , Chakkor Saad , Baghori Mostafa , Hajraoui Abderrahmane
In WSN the sensor nodes are usually powered by batteries and thus have very limited lifetime if no power management is performed. Because of this major limitation, energy-efficient techniques are main research challenge in this context to solve it. Dividing the network in clusters is an effective technique to achieve this goal. This algorithm is based on creating virtual sub-groups of sensor nodes in order to minimize routing calculations and to reduce the size of cluster head data aggregation. Nowadays, a lot of heterogeneous clustering protocols for WSN are created. Nevertheless, these protocols need to find the optimal clusters formation in the network that conserve CHs and theirs member nodes energy consumption. A new approach is proposed combining between an efficient clustering algorithm K-means and our proposed DEEC.  This approach has been employed to enhance DEEC protocol performances. Numerical simulation proves that the improved protocol entitled KM-DEEC achieves a satisfactory results compared to others DEEC protocol versions.
Volume: 3
Issue: 1
Page: 143-150
Publish at: 2016-07-01

Design of Observer-Based Robust Power System Stabilizers

10.11591/ijeecs.v3.i1.pp38-48
Hisham M. Soliman , Mahmoud Soliman
Power systems are subject to undesirable small oscillations that might grow to cause system shutdown and consequently great loss of national economy. A model to describe power system dynamics for different loads is derived in the norm-bounded form. The first controller design is based on the derived model to achieve  robust stability against load variation. The design is based on a new Bilinear matrix inequality (BMI) condition. The BMI optimization  is solved interatively in terms of Linear Matrix Inequality (LMI) framework. The condition contains a symmetric positive definite full matrix to be obtained, rather than the commonly used block diagonal form. The difficulty in finding a feasible solution is thus alleviated. The resulting LMI is of small size, easy to solve. The second PSS design shifts the closed loop poles in a desired region so as to achieve a favorite  settling time and damping ratio via a non-iterative solution to a set of LMIs.  Simulation results based on single-machine and multi-machine power system models verify the ability of the proposed PSS to satisfy control objectives for a wide range of load conditions.
Volume: 3
Issue: 1
Page: 38-48
Publish at: 2016-07-01

Improvement Model Damping Low Frequency Oscillations Presence UPFC by Cuckoo Optimization Algorithm

10.11591/ijeecs.v3.i1.pp67-79
M. Yousefi Anarkooli , H. Afrakhteh
Low frequency oscillation (LFO) is a negative phenomenon repeated for the power system increases the risk of instability. In recent years, power systems stabilizer (PSS) for damping low frequency oscillations is used. With FACTS devices such as integrated power flow controller (UPFC) can control power flow and  transient   stability increase.  So, UPFC low   frequency oscillation damping can be used instead of PSS. UPFC through direct control voltage and low frequency oscillation damping can be improved. In this study, a single linear model of synchronous machine connected to an infinite bus Heffron-Philips in the presence of UPFC to improve low frequency oscillation damping is used. The selection of the output feedback parameters for the UPFC controllers is converted to an optimization problem which is solved by cuckoo optimization algorithm (COA). COA, as a new evolutionary optimization algorithm, is used in multiple applications. This optimization algorithm has a strong ability to find the most optimistic results for dynamic stability improvement. The controller UPFC and damping in MATLAB software environment is designed and simulated. The simulation was performed for a variety of loads and for various loads and more effective UPFC controller electromechanical oscillation damping compared to other algorithm types is shown.
Volume: 3
Issue: 1
Page: 67-79
Publish at: 2016-07-01

A Quantum Chaos Clonal Multiobjective Evolutionary Method Reasearch

10.11591/ijeecs.v3.i1.pp226-234
Shuyue Wu
A quantum chaos cloning multi-objective evolutionary algorithm was proposed herein based on chaos search ergodicity, quantum computing efficiency and clonal selection theory of antibodies in artificial immune system. The qubits encoded initial population is used in the new algorithm, Chaos quantum rotation gates are introduced to update individuals, crowding distance  is used  to keep solution  population distribution and diversity. Theoretical analysis and simulation show the effectiveness of the algorithm.
Volume: 3
Issue: 1
Page: 226-234
Publish at: 2016-07-01

Tifinagh Characters Recognition Using Simple Geometric Shapes

10.11591/ijeecs.v3.i1.pp235-239
M. Boutaounte , Y. Ouadid
In this paper we present method of features extraction based on decomposition of the characters into several simple geometric shapes (segment, arc) by detecting the branch points and end points, as it explained follow a new methods are using to treated the obtained information in order to decide if the characters need to add more key points also in this step we extracte the type of the shapes (segment or arc) and the orientation. The next step of characters recognition different methods are used such as neural network (NN), K-mean and support vector machine (SVM) classifier. The results shown in this paper are obtained using the IRCAM database.
Volume: 3
Issue: 1
Page: 235-239
Publish at: 2016-07-01

Computer vision for Ethiopian agricultural crop pest identification

10.11591/ijeecs.v3.i1.pp209-214
Dagnachew Melesew Alemayehu , Abrham Debasu Mengistu , Seffi Gebeyehu Mengistu
Crop pest is an organism that creates damage on to the agriculture by feeding crops. The research focuses on four major types of crop pest which occurs on teff, wheat, sorghum, barley and maize these are Black tef beetles, Ageda korkur, Degeza and Yesinde Kish Kish. The aim of this paper is identification of the four types of agricultural crop pest using a computer vision technique. The image of crop pest were taken from Amhara regions of Ethiopia i.e. Adiet, Dejen, Gonder, Debremarkos (places where images were taken).  In this paper, artificial neural network (ANN), a hybrid of self organizing map (SOM) with Radial basis function (RBF) and a hybrid of support vector machine (SVM) with Radial basis function (RBF) are used, and also we used Otsu and Kmeans segmentation techniques. Finally we selected Kmeans techniques for segmenting crop pest. In general, the overall result showed that using kmeans segmentation in RBF and SVM perform better than using otsu method in the other algorithm and the recognition performance of the combination of RBF (Radial basis function) and SVM (support vector machine) is 93.33%.
Volume: 3
Issue: 1
Page: 209-214
Publish at: 2016-07-01

A Compressed Sensing Signal Processing Research

10.11591/ijeecs.v3.i1.pp119-125
Guojun Qin , Jingfang Wang
The classical Shannon/Nyquist sampling theorem tells us that in order to not lose information when uniformly sampling a signal we must sample at least two times faster than its bandwidth. Nowadays in many applications, because of the restriction of the Nyquist rate, we end up with too many samples and it becomes a great challenge for further transmission and storage. In recent years, an emerging theory of signal acquirement, compressed sensing(CS), is a ground-breaking idea compared with the conventional framework of Nyquist sampling theorem. It considers the sampling in an novel way, and open up a brand new field for signal sampling process. It also reveals a promising future of application. In this paper, we review the background of compressed sensing development. We introduce the framework of CS and the key technique and illustrate some naïve application on image process.
Volume: 3
Issue: 1
Page: 119-125
Publish at: 2016-07-01

Analysis of Step Up Transformer for Pulsed Electric Fields Generator

10.11591/ijeecs.v3.i1.pp59-66
Yoppy Yoppy , Mohamad Khoirul Anam , Yudhistira Yudhistira , Priyo Wibowo , Harry Arjadi , Hutomo Wahyu Nugroho , Haryo Dwi Prananto
Pulsed electric fields (PEF) is a novel non-thermal food processing whose purpose is inactivating microbes while at the same time preserving food’s nutrition, color, and taste. This paper presents an analysis of step up transormer for PEF high voltage generator. To achieve the optimum PEF effects, the pulse shape should resemble a square, which is characterized by low voltage drop and fast rising time. Through simulations, it has been shown that higher transformer inductance results in lower voltage drop. However at some points, further increasing the inductance would only produces negligible improvements. Meanwhile fast rising time can be achieved by minimizing leakage inductance and parasitic capacitance. Moreover, maximum energy transfer to the load can be obtained by reducing winding resistances. Finally, a case of high voltage generator using ignition coil has been evaluated. Due to its high winding resistances, ignition coil seems to be not suitable for PEF applications.
Volume: 3
Issue: 1
Page: 59-66
Publish at: 2016-07-01

Efficiency Comparaison and Evaluation between Two ETL Extraction Tools

10.11591/ijeecs.v3.i1.pp174-181
Abdellah Amine , Rachid Ait Daoud , Belaid Bouikhalene
In the prospects of making an array of onboard decision support in a public university, we present a comparison between two ETL extraction tools from a production database containing student information.For the implementation we use Pentaho and Sql Server tools and we illustrate the application on the case of Sultan Moulay Slimane University inBeniMellal, Morocco.
Volume: 3
Issue: 1
Page: 174-181
Publish at: 2016-07-01

Hardware Implementation of 3-level Inverter using Microcontroller for Single Phase Induction Motor

10.11591/ijres.v5.i2.pp96-102
Veena B.M. , Parimala S.K.
The conventional two level inverter has many limitations for high voltage & high power applications. The term multilevel began with the three-level inverter. Subsequently, several multilevel inverter topologies have been developed. However, the elementary concept of a multilevel inverter to achieve higher power is to use a series of power semiconductor switches with several lower voltage dc sources to perform the power conversion by synthesizing a staircase voltage waveform. Output voltage of 3 level inverter consists of 3 levels, which results smoother output. And hence the THD will be reduced. In this paper Simulink of 3 level inverter and the hardware implementation of micro controller based control of multilevel inverter for single phase Induction motor are presented.
Volume: 5
Issue: 2
Page: 96-102
Publish at: 2016-07-01

Analysis of Different Ways of Crosstalk Measurement in GSM Network

10.11591/ijres.v5.i2.pp103-107
Musefiu Aderinola , Bokolo Abovie , Festus Okosi , Igoniderigha Daniel , G.F. Odubo
Crosstalk is one of the problems that affect the performance operation of global system mobile (GSM) network. Among the effect of crosstalk are call mute, call drop, wire propagation delay, dynamic power dissipation etc. Crosstalk is an undesirable signal arising due to the coupling capacitances between adjacent interconnecting wires and measured in decibel. In this paper some literature were reviewed and different ways of measuring crosstalk such as Near end croosstalk (NEXT), far end crosstalk (FEXT), Power sum crosstalk (PSNEXT) and alien crosstalk (AXT) were analyzed.  
Volume: 5
Issue: 2
Page: 103-107
Publish at: 2016-07-01

Investigations of Electrostatic and Ionized Fields Analysis for Dual-Electrode System

10.11591/ijeecs.v3.i1.pp80-90
Mohamed A. Abouelatta , Abdelhadi R. Salama , A. M. Omar , S. A. Ward
The paper presents the computation and measurement of electric field, in both electrostatic as well as ionized case, for dual electrode system intended for electrostatic applications. The dual electrode system consists of an ionizing and non-ionizing electrode have the same voltage and facing a grounded collecting plate. The charge simulation method (CSM) coupled with genetic algorithms (GAs) and method of characteristic (MOC) is applied to compute the electrostatic field and the ionized field respectively. The influence of dual system parameters such as ionized wire diameter and inter electrode distances on the profile of the electrostatic field on the collecting plate and on the surface of the ionizing wire has been studied. The measurements of the ionized electric field, current-voltage characteristics and ion current density profiles are implemented using the technique of the linear biased probe. An experimental setup is constructed to model the present electrode arrangement. The measurements are carried out for ionized wire of diameter 0.25 and 0.5mm. The computed results are found to be in good agreement with experiments.
Volume: 3
Issue: 1
Page: 80-90
Publish at: 2016-07-01
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