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23,598 Article Results

The Implementation of S-curve Acceleration and Deceleration Using FPGA

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1962
Guangyou Yang , Zhijian Ye , Yurong Pan , Zhiyan Ma
This paper analyzes the basic principle of S-curve acceleration and deceleration, and presents an implementation method of S-curve control algorithm based on FPGA. The S-curve function module diagram and implementing method of PWM speed adjusting are described in FPGA. The steps of S-curve speed dissociation module and PWM variable frequency speed control are shown in this paper. High Performance and Capacity Mixed HDL Simulation software – ModelSim is used to verify the algorithm Verilog HDL code executed in FPGA. At last, a test experiment utilizing such algorithm mentioned above is carried out on one x-y working stand. There is a good agreement between simulation and experiment. The experimental results indicate that the algorithm is simple and reliable enough to meet different application requirements. DOI: http://dx.doi.org/10.11591/telkomnika.v11i1.1897
Volume: 11
Issue: 1
Page: 279-286
Publish at: 2012-01-10

Automatic Segmentation of Glottal Space from Video Images Based on Mathematical Morphology and the hough Transform

https://ijece.iaescore.com/index.php/IJECE/article/view/5392
Davod Aghlmandi , Karim Faez
Vocal disorders directly arise from the physical shape of the vocal cords. Videostroboscopic imaging provides doctors with valuable information about the physical shape of the vocal cords and about the way these cords move. Segmentation of the glottal space is necessary in order to characterize morphological disorders of vocal folds. One of the main problems with the methods presented is their low level of accuracy. To solve this problem, an automatic method based on Mathematical Morphology edge detection and the Hough transformation is presented in this article to extract the glottal space from the videostroboscopic images presented. Our method compared with the histogram and active contours methods and the findings showed that our proposed method yields better results.DOI:http://dx.doi.org/10.11591/ijece.v2i2.212
Volume: 2
Issue: 2
Page: 223-230
Publish at: 2011-12-30

Dynamic Performance Analysis of Permanent Magnet Hybrid Stepper Motor by Transfer Function Model for Different Design Topologies

https://ijece.iaescore.com/index.php/IJECE/article/view/5387
E.V.C Sekhara Rao , P.V.N Prasad
This paper discuss about dynamic performance analysis of permanent magnet hybrid stepper motor during single stepping by transfer function model for eight topologies using PDE toolbox of Matlab, for different current densities for two types of core materials.. These results suggest modifications for better performance of the PMH stepper motor for better dynamic response during single stepping.DOI:http://dx.doi.org/10.11591/ijece.v2i2.195
Volume: 2
Issue: 2
Page: 191-196
Publish at: 2011-12-30

IRIS Feature Extraction and Classification using FPGA

https://ijece.iaescore.com/index.php/IJECE/article/view/5391
Babasaheb G. Patil , Nikhil Niwas Mane , Shaila Subbaraman
An approach of singular value (SVD) of a (mxn) 2-D matrix has beenpopularly used by researchers for representing a 2-D image by a set of less than or equal to n values sequenced in descending order of which a subset of only first few values which are significant is treated as a set of features for that image. These features are further used for image recognition and classification. Though many papers as reviewed from literature have discussed about this implantation using software/MATLAB approach, rarely a paper appears on hardware implementation of SVD algorithm for image processing applications. This paper presents the details of a hardware architecture developed by us to implement SVD algorithm and then presents the results of implementation of this architecture in the Xilinx field programmable gate array Virtex5 to extract the features of an iris image. A comparison between the feature values extracted by MATLAB and those obtained by hardware simulation using Xilinx ISE tool indicates a very good match validating the hardware architecture. A hamming distance classifier using appropriate threshold values stored in ROM is used to classify the iris images.DOI:http://dx.doi.org/10.11591/ijece.v2i2.158
Volume: 2
Issue: 2
Page: 214-222
Publish at: 2011-12-30

Experimental Study on Increasing the Received Power of Antenna using Circularly-Polarized Array Antenna

https://ijece.iaescore.com/index.php/IJECE/article/view/5390
A. Adya Pramudita , Lydia Sari , V. Windha Mahyastuti
A method to increase the received power of an antenna system by combining polarization, space and frequency diversities is investigated in this paper. The antenna system under investigation consisted of an array of 10 microstrip antenna elements. Each antenna element is a microstrip antena with circular polarization. Two array antennas with circularly polarized elements  have been designed for receiving eloctromagnetic energy in 900 MHz and 1800 MHz band. Laboratory measurement has been conducted to study the increase of antenna received power caused by combining space, polarizarion and frequency diversities. Results show that the proposed method is able to increase the received power by 12.9 dB at 900 MHz and by 8.4 dB at 1800 MHz in an indoor environment; and by 15.8 dB at 900 MHz and by 9.5 dB at 1800MHz. This increase is mainly contributed by the use of space diversity, namely the use of array of 10 elements which contributed to increase the received power by 10.3 dB in an indoor environment. The useof circularly-polarized element increased the received power by 2.6 dB. Of the three diversities proposed, frequency diversity was found to have the least significant contribution becase the received power from 1800 MHz band is smaller than the 900 MHz band.DOI:http://dx.doi.org/10.11591/ijece.v2i2.209
Volume: 2
Issue: 2
Page: 207-213
Publish at: 2011-12-30

Identification of Faults in HVDC System using Wavelet Analysis

https://ijece.iaescore.com/index.php/IJECE/article/view/5385
Satya Narayana , Bonigala Ramesh , Saheb Hussain
The identification and classification of faults is important for safe and optimal operation of power systems. For secure operation of a system a feasible approach is to monitor signals so that accurate and rapid classification of fault is possible for making correct protection control.To identify HVDC faults by using pure frequency or pure time domain based method is difficult. The pure frequency domain based methods are not suitable for time varying transients and the pure time domain based methods are very easily influenced by noise.Wavelet analysis is one of the methods used for providing discriminative features with small dimensions to classify different disturbances in HVDC transmission system. This paper explores the application of wavelet based Multi-Resolution Analysis (MRA) for signal decomposition to monitor some faults in HVDC system. The faults in HVDC system can be classified by monitoring the signals both on AC and DC sides of the HVDC system. The fault classifier can be developed from these monitored signals which show promising features to classify different disturbances in the HVDC system.DOI:http://dx.doi.org/10.11591/ijece.v2i2.179
Volume: 2
Issue: 2
Page: 175-182
Publish at: 2011-12-30

A Decoupled Parameters Estimators for in Nonlinear Systems Fault diagnosis by ANFIS

https://ijece.iaescore.com/index.php/IJECE/article/view/5384
Bellali Badre , A. Hazzab , I. K. Bousserhane , Dimitri lefebvre
This paper presents a new and efficient Adaptive Neural Fuzzy Inference Systems approach for satellite’s attitude control systems (ACSs) fault diagnosis. The proposed approach formulates the fault modelling problem of system component into an on-line parameters estimation The learning  ability of the adaptive neural fuzzy inference system allow as to decoupling the effect of each fault from the estimation of the others.  Our solution provides a method to detect, isolate, and estimate various faults in system components, using Adaptive Fuzzy Inference Systems Parameter Estimators (ANFISPEs) that are designed and based on parameterizations related to each class of fault. Each ANFISPE estimates the corresponding unknown Fault Parameter (FP) that is further used for fault detection, isolation and identification purposes. Simulation results reveal the effectiveness of the developed FDI scheme of an ACSs actuators of a 3-axis stabilized satellite.DOI:http://dx.doi.org/10.11591/ijece.v2i2.221
Volume: 2
Issue: 2
Page: 166-174
Publish at: 2011-12-30

Dense Wavelength Division Multiplexing Optical Network System

https://ijece.iaescore.com/index.php/IJECE/article/view/5389
Md. Masud Rana , Muhammad Abdul Goffar Khan
In this paper, a dense wavelength division multiplexing (DWDM) system with 64 modulated channels 50 GHz spacing covering 25.2-nm bandwidth has been demonstrated. When optical signals are to travel over long distances, it’s be faded and spread out. So, it is necessary to strengthen the signal at intervals. To keep the signal strength at same level in the DWMD system, Er-doped fiber amplifier (EDFA) has been used. The EDFA provides a gain across the bandwidth with 10 dB average gain and a gain shape variation peak-to-peak of about 1 dB. OptSim’s physical EDFA model has been used for DWMD systems.DOI:http://dx.doi.org/10.11591/ijece.v2i2.202
Volume: 2
Issue: 2
Page: 203-206
Publish at: 2011-12-30

Transforming Model to Meta Model for Knowledge Repository of Malay Intangible Culture Heritage of Malaysia

https://ijece.iaescore.com/index.php/IJECE/article/view/5393
Radiah Amin
Intangible Culture Heritage is very important as national treasure for a country since it is a part of identity of the country. Rapid technology changed and globalization is one of the reasons why new generation less interested to involve in culture heritage sector. Without any drastic action to safeguard Intangible Culture Heritage for the country it will cause endanger to disappearance. In this study researcher introduce a model of factors that contributing in archiving Intangible Culture Heritage. By transform from the model to meta model it will be a guidelines, standard and base for developing a repository of Intangible Culture Heritage. The finding for this research is a vital and very fruitful for intangible study and archiving and also as a main contribution for this study.DOI:http://dx.doi.org/10.11591/ijece.v2i2.205
Volume: 2
Issue: 2
Page: 231-238
Publish at: 2011-12-30

Power Generation Pricing Model Based on Long Rung Marginal Cost Methodology

https://ijece.iaescore.com/index.php/IJECE/article/view/5382
Priyanka Roy , Abhijit Chakrabarti
This paper proposes a long run marginal cost based formulation for reflecting the usage based pricing of electrical power. The aim of this paper is to develop a novel method that can price the real power on a long term basis in a multi-machine power system. The proposed method has shown that the cost of future investment is governed by the perturbation of generating power.  The economic efficiency of the proposed model is demonstrated in a 203 buses 267 lines 23 machines real power system of eastern part of India where total 23 generators are categorized in 5 types according to their ratings and analyzed the price at their optimal operating condition with 10% loading variation.DOI:http://dx.doi.org/10.11591/ijece.v2i2.191
Volume: 2
Issue: 2
Page: 155-158
Publish at: 2011-12-30

Dynamic Response of a Grid Connected Wind Farm with Different Types of Generators

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4887
Helmy Mohammed El_ Zoghby , S.M. Sharaf
For a wide areas wind farm, which composed of different zones of different wind turbines and different generators , this paper aims to simulate  a wind farm model that icludes  a wind turbine and three different  types of generators , which are three phase synchronous generator, three phase squirrel-cage induction generator and three phase doubly-fed induction generator ,these generators are the main machines that generally used in the field of wind energy generation.  All generators are connected in parallel at the point of common coupling (pcc)  and connected to the utility grid . This model is a simple representation of the actual  model of  zafarana  wind farm,  which is the biggest wind farm in Egypt and further to use it in different kinds of simulations, and display the difference in response among all generators, where all generators are  500 kw power rating , and subjected to the same operating conditions .After modeling the system, the transient response of the system will be studied and analyzed at different operating cases as:Case.1 constant wind speed operationCase.2 variable wind speed operationCase.3 sudden change in turbine mechanical powerCase.4 sudden change in wind speed.So this paper introduces a survey on the dynamic response of a large wind farm of different generators at different operating conditions  Keywords: modeling, synchronous generator, induction generator, wind farm, simulation model, transient analysis.DOI: http://dx.doi.org/10.11591/ijpeds.v2i1.175
Volume: 2
Issue: 1
Page: 85-98
Publish at: 2011-12-14

ANN Controlled VSC with Harmonic Reduction for VAR Control of Transmission Line

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4886
Ram Shankarrao Dhekekar , N V Srikanth
Complete close-loop smooth control of reactive power can be achieved using shunt connected FACTS devices. STATCOM is one of the shunt connected FACTS device which can be utilized for the purpose of reactive power compensation. Intelligent FACTS devices make them adaptable and hence it is emerging in the present state of art. This paper presents close loop control techniques based on artificial neural networks (ANNs) to control reactive power generated by long transmission line over wide range so as to maintain constant voltage profile at the receiving end. With ANN technique and H-bridge multilevel VSC topology harmonics are eliminated to accepted level. A 9-Level H-Bridge VSC based STATCOM is used to handle the reactive power of the line .The close loop control is achieved by PI and neural network. . This paper is about real time simulation and implementation of PI controlled VSC STATCOM for 750km lab model of artificial transmission line. PI controller and neural network control schemes implemented and investigated. With Matlab simulation and actual testing proves that these devices when installed, they keep the bus voltage same as reference voltage (sending-end voltage). The results are prominent and give a way for real-time implementation of the proposed control schemes. These control schemes are simulated for the real-time control along with real-time modeling and simulations. Relative Harmonic analysis, for both the schemes are discussed. The results are prominent and give a way for real-time implementation.DOI: http://dx.doi.org/10.11591/ijpeds.v2i1.206
Volume: 2
Issue: 1
Page: 76-84
Publish at: 2011-12-14

Automatic Generation Control in Multi Area Interconnected Power System by using HVDC Links

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4885
Yogendra Arya , Narendra Kumar , Hitesh Dutt Mathur
This paper investigates the effects of HVDC link in parallel with HVAC link on automatic generation control (AGC) problem for a multi-area power system taking into consideration system parameter variations. A fuzzy logic controller is proposed for four area power system interconnected via parallel HVAC/HVDC transmission link which is also referred as asynchronous tie-lines. The linear model of HVAC/HVDC link is developed and the system responses to sudden load change are studied. The simulation studies are carried out for a four area interconnected thermal power system. Suitable solution for automatic generation control problem of four area electrical power system is obtained by means of improving the dynamic performance of power system under study. Robustness of controller is also checked by varying parameters. Simulation results indicate that the scheme works well. The dynamic analyses have been done with and without HVDC link using fuzzy logic controller in Matlab-Simulink. Further a comparison between the two is presented and it has been shown that the performance of the proposed scheme is superior in terms of overshoot and settling time.DOI: http://dx.doi.org/10.11591/ijpeds.v2i1.182
Volume: 2
Issue: 1
Page: 67-75
Publish at: 2011-12-14

Torque Analysis of Permanent Magnet Hybrid Stepper Motor using Finite Element Method for Different Design Topologies

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4889
E.V.C Sekhara Rao , P.V.N Prasad
This paper discusses about permanent magnet hybrid stepper motor magnetic circuit using finite element model for different geometric designs like uniform air-gap, non uniform air-gap, for different air-gap lengths, different tooth pitches and extra teeth on stator using PDE toolbox of Matlab at different current densities. Implementing these results in equivalent circuit model (permeance model), motor performance is analyzed for an existing motor for steady state conditions. These results suggest modifications for better performance of the PMH stepper motor like reduction of cogging torque and improvement in steady state torque with minimum THD.DOI: http://dx.doi.org/10.11591/ijpeds.v2i1.140
Volume: 2
Issue: 1
Page: 107-116
Publish at: 2011-12-14

Design of Robust Power System Stabilizer Considering Less Control Energy

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4888
Cuk Supriyadi Ali Nandar
This paper proposes design a robust power system stabilizer (PSS) considering less control energy using a genetic algorithm (GA). The structure of proposed PSS is a 1st-order lead-lag compensator, it is easy to implement in power system utility. In the design, system uncertainties are modeled by an inverse additive uncertainty. The performance, robust stability condition, and less control energy of the designed system are formulated as the objective function in the optimization problem. The GA is applied to solve an optimization problem and to achieve control parameters of proposed PSS. The performance and robustness against system uncertainties of the proposed PSS are investigated in the single-machine infinite bus system in comparison with a conventional PSS and a PSS designed by fixed-structure H∞ loop shaping. Simulation results show that with less control energy, the robustness and damping effect of the proposed PSS can be guaranteed against various operating conditions.Keywords: Control system design, operation and control of power systems, robust control application, less control energyDOI: http://dx.doi.org/10.11591/ijpeds.v2i1.143
Volume: 2
Issue: 1
Page: 99-106
Publish at: 2011-12-14
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