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25,002 Article Results

Effects of the Droop Speed Governor and Automatic Generation Control AGC on Generator Load Sharing of Power System

10.11591/ijape.v4.i2.pp84-95
Youssef Mobarak
In power system, as any inequality between production and consumption results in an instantaneous change in frequency from nominal, frequency should be always monitored and controlled. Traditionally, frequency regulation is provided by varying the power output of generators which have restricted ramp rates. The Automatic Generation Control AGC process performs the task of adjusting system generation to meet the load demand and of regulating the large system frequency changes. A result of the mismatches between system load and system generation, system frequency and the desired value of 50 Hz is the accumulation of time error. How equilibrium system frequency is calculated if load parameters are frequency dependent, and how can frequency be controlled. Also, how do parameters of a speed governor affect generated power. The transient processes before system frequency settles down to steady state. Finally, AGC in what way is it different from governor action. This paper presents new approaches for AGC of power system including two areas having one steam turbines and one hydro turbine tied together through power lines.
Volume: 4
Issue: 2
Page: 84-95
Publish at: 2015-08-01

A Scalable Large Format Display Based on Zero Client Processor

10.11591/ijece.v5i4.pp714-719
Sang Don Kim , Seung Eun Lee
This paper proposes zero client module that targets Large  Format Display (LFD) system for display wall. Increased resolution in modern LFD requires a high bandwidth channel and a high performance display controller to transfer the image data to the monitor. The key idea is to use a Gagabit-Etherent communication based Daisy-Chain to transfer an image data. This communication supports sufficient bandwidth for image data transfer. As a result, we implement the LFD system using tha zero  client module and LFDmonitors.
Volume: 5
Issue: 4
Page: 714-719
Publish at: 2015-08-01

Two Level Clustering for Quality Improvement using Fuzzy Subtractive Clustering and Self-Organizing Map

10.11591/ijeecs.v15.i2.pp373-380
Erick Alfons Lisangan , Aina Musdholifah , Sri Hartati
Recently, clustering algorithms combined conventional methods and artificial intelligence. FSC-SOM is designed to handle the problem of SOM, such as defining the number of clusters and initial value of neuron weights. FSC find the number of clusters and the cluster centers which become the parameter of SOM. FSC-SOM is expected to improve the quality of FSC since the determination of the cluster centers are processed twice i.e. searching for data with high density at FSC then updating the cluster centers at SOM. FSC-SOM was tested using 10 datasets that is measured with F-Measure, entropy, Silhouette Index, and Dunn Index. The result showed that FSC-SOM can improve the cluster center of FSC with SOM in order to obtain the better quality of clustering results. The clustering result of FSC-SOM is better than or equal to the clustering result of FSC that proven by the value of external and internal validity measurement.
Volume: 15
Issue: 2
Page: 373-380
Publish at: 2015-08-01

Design of Slotted and Slotless AFPM Synchronous Generators and their Performance Comparison Analysis by using FEA Method

10.11591/ijece.v5i4.pp810-820
Saint Saint Soe , Yan Aung Oo
Axial-flux permanent magnet machines are popular and widely used for many applications due to their attractive features such as light weight, low noise, high torque, robust and higher efficiency due to lack of field excitation. The main essence of this paper is to perform slotted and slotless axial-flux permanent magnet synchronous generator design based on theoretical sizing equations and then finite element analysis is reinforcement in order to get a more reliable and accuracy machine design. A comparative study of machine design and performances over the same rating but different configurations i.e., slotted and slotless are also discussed. And then, finite-element method (FEM) software was made for the slotted stator and slotless stator (AFPMSG) in order to compare their magnetic flux density and efficiency. The AFPMSG topology considered in this paper is a three-phase double-rotor single-stator topology with 16 pole-pairs, 2kW rated power and 188 rpm rated speed.
Volume: 5
Issue: 4
Page: 810-820
Publish at: 2015-08-01

Phonemes Classification Using the Spectrum

10.11591/ijeecs.v15.i2.pp368-372
Ahmed El Ghazi , Cherki Daoui
In this work, we present an automatic speech classification system for the Tamazight phonemes. We based on the spectrum presentation of the speech signal to model these phonemes. We have used an oral database of Tamazight phonemes. To test the system’s performances, we calculate the classification rate. The obtained results are satisfactory in comparison with the reference database and the quality of speech files.
Volume: 15
Issue: 2
Page: 368-372
Publish at: 2015-08-01

Software Based Approach for teaching in Electrical Engineering Classroom Courses: a Case Study

10.11591/ijeecs.v15.i2.pp361-367
Hemant Mehar
As the day by day changes in the technology, technical requirements and techniques of the industry changes simultaneously. Therefore the requirements to educate our students not only the conceptual as well as new approaches based on the latest techniques. Involvement of software in teaching is not only providing a better support, more clear and visual operation of complex circuits and waveforms of the faculty of power electronics in classroom teaching as well as to the student to understand a better concept. The software packages available for simulation of power electronic circuits are MATLAB, PSPICE and PSIM and many more. In this paper author takes an example of an AC voltage controller to explain the software based teaching approach. Author used two software based simulation tool to explain the AC Voltage Controller and compare the software based approach with the blackboard & PPT Presentation based technique. This paper is helpful for the faculty of electrical engineering to find the applications of MATLAB/SIMULINK and PSIM in teaching.
Volume: 15
Issue: 2
Page: 361-367
Publish at: 2015-08-01

Gabor-HOG Features based Face Recognition Scheme

10.11591/ijeecs.v15.i2.pp331-335
Hamid Ouanan , Mohammed Ouanan , Brahim Aksasse
Extraction of invariant features is the core of Face RecognitionSystems (FRS). This work proposes a novel feature extractor-fusion scheme using two powerful feature descriptor known as Gabor Filters (GFs) and Histogram of Oriented Gradient (HOG), which the face image is filtered with the multiscale multiresolution Gabor filter bank to generate multiple Gabor magnitude images (GMIs), then the down-sampled GMIs and apply Histogram of Oriented Gradient to form the features. The experimental results on the FERET face database show the effectiveness of our methods.
Volume: 15
Issue: 2
Page: 331-335
Publish at: 2015-08-01

Isolated Handwritten Eastern Arabic Numerals Recognition Using Support Vectors Machines

10.11591/ijeecs.v15.i2.pp346-351
B. El Kessab , C. Daoui , B. Bouikhalene , R. Salouan
In this paper, we present a comparison between the different variations of virtual retina (grid size) in features extraction with the support vectors machines classifier for isolated handwritten Eastern Arabic numerals recognition. For this purpose we have used for pre-processing each numeral image the median filter, the thresholding, normalization and the centering techniques. Furthermore, the experements results that we have obtained demonstrate really that the most powerful method is that virtual retina size equal 20x20. This work has achieved approximately 85% of success rate for Eastern Arabic numerals database identification.
Volume: 15
Issue: 2
Page: 346-351
Publish at: 2015-08-01

Real-time Colorized Video Images Optimization Method in Scotopic Vision

10.11591/ijeecs.v15.i2.pp321-330
Chen Yong , Shuai Feng , Zhan Di
In low light environment, the surveillance video image has lower contrast，less information and uneven brightness. To solve this problem, this paper puts forward a contrast resolution compensation algorithm based on human visual perception model. It extracts Y component from the YUV video image acquired by camera originally to subtract contrast feature parameters, then makes a proportional integral type contrast resolution compensation for low light pixels in Y component and makes index contrast resolution compensation for high light pixels adaptively to enhance brightness of the video image while maintains the U and V components. Then it compresses the video images and transmits them via internet. Finally, it decodes and displays the video image on the device of intelligent surveillance system. The experimental results show that, the algorithm can effectively improve the contrast resolution of the video image and maintain the color of video image well. It also can meet the real-time requirement of video monitoring.
Volume: 15
Issue: 2
Page: 321-330
Publish at: 2015-08-01

Side Effects in a HEMT Performance with InAlN/GaN

10.11591/ijeecs.v15.i2.pp249-258
Z. Kourdi , B. Bouazza , A. Guen-Bouazza , M. Khaouani
We present a simulation of a HEMT (high electron mobility transistor) structure. We extract the device characteristics through the analysis of DC, AC and high frequency regimes, as shown in this paper. This work demonstrates the optimal device with a gate length of 30 nm, and InAlN/GaN heterostructure for minimizing side effects. The simulated with Silvaco software of the HEMT devices with the materials InAlN show very good scalability in different application. We have demonstrated an excellent current density, as high as 644 mA/mm, a peak extrinsic transconductance of 710 mS/mm at VDS=2 V, and cutting frequency cutoffs of 385 GHZ, maximum frequency of 810 GHz, maximum efficiency of 23% for x-Band, maximum breakdown voltage of 365 V, and an ON/OFF current density ratio higher than 8 x 108. These values were determined through the simulation by hydrodynamics models, which makes that optimize the design is the future of this technology.
Volume: 15
Issue: 2
Page: 249-258
Publish at: 2015-08-01

Flight-Path Tracking Control of an Aircraft Using Backstepping Controller

10.11591/ijeecs.v15.i2.pp270-276
Labane Chrif , Zemalache Meguenni Kada , Tahar Mohamed
For transportation aircraft, the primary control objective for an autopilot system engaged during approach and landing is relative to the flight path tracking on the basis of highly simplified linear models of flight dynamics. The dynamics governing the flight path of an aircraft are in general highly nonlinear and involve complex physics for which no accurate models are available. In this paper a nonlinear model describing the longitudinal equations of motion in strick feedback form is derived. Backstepping is utilized for the construction of a globally stabilizing controller with a number of free parameters. It is implemented a controller with an internal loop controls involving the pitch rate of the aircraft and an external loop which includes angle of attack, path angle and pitch angle. Finally, nonlinear simulation results for a longitudinal model of a transportation aircraft are displayed and discussed.
Volume: 15
Issue: 2
Page: 270-276
Publish at: 2015-08-01

Power Control of High Penetration PV in Distribution Network

10.11591/ijeecs.v15.i2.pp217-228
Saman Hosseini Hemati , Ashkan Mohammadi
Photovoltaic energy is one of the fastest growing renewable energy sources in the worldand as the issue of energy security is becoming more and more important it could be a promising option. But as photovoltaic energy is becoming widespread and penetration level of photovoltaic power plants increase, issues rise in distribution networks.In this paper a power control scheme for a high penetration photovoltaic power plant in a radial distribution network will be presented. This control scheme includes an efficient Maximum Power Point Tracking (MPPT), DC link voltage control by managing power balance between the hysteresis controlled inverter and a boost converter. Another aspect of High Penetration PV (HPPV) which is overvoltage in Point of Common Coupling (PCC) is also investigated and maximum allowable Penetration Level (PL) will be determined. Simulations have been done in Matlab/Simulink environment.
Volume: 15
Issue: 2
Page: 217-228
Publish at: 2015-08-01

Design, Testing Analysis of High Tension Increased Safety Motor for Hazardous areas

10.11591/ijeecs.v15.i2.pp237-248
Bhagirath Ahirwal , Tarun Kumar Chatterjee
The increased safety (Ex e) motors are designed for safe operation in the zone 1 and 2 hazardous areas. The present paper describes the significant design parameters and successful testing of Ex e high tension (HT) induction motor rated 970KW/6.6KV/18 pole/ 3Phase/ 50Hz as per IS/IEC 60079-7 standard. The comparison of some useful design parameters is also given between safe area motor and hazardous area motor in this paper. The Ex e high tension induction motor mentioned in this paper have been manufactured by Bharat Heavy Electricals Ltd. (BHEL), Bhopal, India during the project and main author was the project leader.
Volume: 15
Issue: 2
Page: 237-248
Publish at: 2015-08-01

Recognition of a Face in a Mixed Document

10.11591/ijeecs.v15.i2.pp301-312
Lhoussaine Bouhou , Rachid El Ayachi , Mohamed Fakir , Mohamed Oukessou
Face recognition is the field of great interest in the domaine of research for several applications such as biometry identification, surveillance, and human-machine interaction…This paper exposes a system of face recognition. This system exploits an image document text embedding a color human face image. Initially, the system, in its phase of extraction, exploitis the horizontal and vertical histogram of the document, detects the image which contains the human face. The second task of the system consists of detecting the included face in other to determine, with the help of invariants moments, the characteristics of the face. The third and last task of the system is to determine, via the same invariants moments, the characteristics of each face stored in a database in order to compare them by means of a classification tool (Neural Networks and K nearest neighbors) with the one determined in the second task for the purpose of taking the decision of identification in that database, of the most similar face to the one detected in the input image.
Volume: 15
Issue: 2
Page: 301-312
Publish at: 2015-08-01

Modeling of Balanced and Unbalanced Three-Phase Induction Motor under Balanced and Unbalanced Supply Based on Winding Function Method

10.11591/ijece.v5i4.pp644-655
Mohammad Jannati , Tole Sutikno , Nik Rumzi Nik Idris , Mohd Junaidi Abdul Aziz
An accurate model of balanced and unbalanced three-phase Induction Motor (IM) under balanced and unbalanced supply conditions based on Winding Function Method (WFM) is presented in this work. In this paper, the unbalanced condition in three-phase IM is limited to stator winding open-phase fault. The analysis of presented models is shown in details which allow predicting the performance of 3-phase IM under different conditions. Computer simulations were obtained using the MATLAB software for a three-phase squirrel cage IM. MATLAB simulation results show that the oscillation of the speed and electromagnetic torque has increased considerably due to the open-phase fault in stator windings.
Volume: 5
Issue: 4
Page: 644-655
Publish at: 2015-08-01
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