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23,598 Article Results

Thermographic evaluation of electro-mechanical relays’ quality in railway automation

https://ijece.iaescore.com/index.php/IJECE/article/view/5365
Anna Vladova Andonova
By using thermal photography the quality of an electro-mechanical relay can be examined during production and the reliability of the series can be guaranteed at higher electric current values during commutation process. During exploitation thermal photography is provided information about the degree of wearing out of contacts and to help determine which contacts need to be replaced. By means of thermal photography the duration of gas discharge is determined and this duration is an indicator about the speed of wearing out of the contacts. The article offers a method to determine the quality of electro-mechanical relays especially developed for switching of powerful electrical circuits used in railway automation.Keywords: NDE, thermography, electromechanical relaysDOI:http://dx.doi.org/10.11591/ijece.v2i1.33
Volume: 2
Issue: 1
Page: 1-6
Publish at: 2011-10-29

Harmonics Mitigation of Industrial Motor Drives with Active Power Filters in Cement Plant-A Case Study

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4878
Y Kusumalatha , Y P Obulesh , Ch Saibabu
With the increasing of use of power electronic controlled variable speed drives in industries, power quality distortion in electric power system has become a serious issue in recent years. In cement plants, because of presence of more number of adjustable speed electric drives, this problem is a greater concern. In this paper, the impacts of harmonic distortions due to Adjustable speed electric drives in Anjani Portland cement Ltd, Jaggayapet, Nolgonda (Dist), A.P, India is investigated.  Harmonic measurements at various motor drives with the help of Fluke 434 power quality analyzer have been done to determine where a significant amount of harmonic currents or voltages are presented. From these measurements and subsequent calculations, the impact of harmonics is analyzed and found that the harmonic content of the motor drives to be minimized within the limits of international harmonic standards. In recently, active power filters gained an increased attention due to their effective harmonic reduction. In this paper an active power filter has been developed for minimization of the harmonics, which is implemented in Matlab/simulink based on real time measurement of harmonic data.DOI: http://dx.doi.org/10.11591/ijpeds.v2i1.120
Volume: 2
Issue: 1
Page: 1-8
Publish at: 2011-10-29

Linguistic Application Using Transitivity-Appraisal Analysis

https://ijece.iaescore.com/index.php/IJECE/article/view/35
Alexander Setiawan , Djoni Haryadi Setiabudi , Yanuar Simon
AbstractIn conducting research and linguistic analysis, researchers often find a variety of obstacles because of their limitations as human beings. A large number of articles data that must be processed and calculated increase the risk of error in the analysis, either in error in classification or error in the calculation. That’s why an application is made to assist researchers in conducting their research. This research was provided a specific framework to support the needs analysis process. This program is specifically designed to support the entire process of analysis required by using the method of analysis transivity analysis and assessment, which include searching and data processing articles, clauses classification process, and analytical assessment of this clause. The results of this study are to perform data storage process of said search results of an article, save the data analysis process from an article, the classification of phrase in the sentence in the article, and can minimize risk of calculation errors that occur in analysis. Test carried out using aplha reliability coeficient 0,75 (75%). Keywords: Analyze, Linguistic, Application.DOI:http://dx.doi.org/10.11591/ijece.v1i2.11
Volume: 1
Issue: 2
Page: 171-181
Publish at: 2011-10-29

A Cost Effective sensorless vector control of 4- Switch 3-Phase Inverter Fed IM using MRAS

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4869
Haitham Zaki Azazi , M. K. Metwally , Z. M. El-Barbary
This paper investigates performance of a Model reference adaptive system (MRAS) based cost-effective drive system of an induction motor (IM) for low-cost applications. In this paper, the MRAS is used as a speed estimator and the motor is fed from a four-switch three-phase (FSTP) inverter instead of a conventional six-switch three-phase (SSTP) inverter. This configuration reduces the cost of the inverter, the switching losses, and the complexity of the control algorithms. The robustness of the proposed MRAS-based FSTP inverter fed IM drive is verified by Experimental results at different operating conditions. A comparison of the proposed FSTP inverter fed IM drive with a conventional SSTP inverter system is also made in terms of the performance analysis. The proposed FSTP inverter fed IM drive is found quite acceptable considering its performance, cost reduction and other advantages.DOI: http://dx.doi.org/10.11591/ijpeds.v1i2.100
Volume: 1
Issue: 2
Page: 113-120
Publish at: 2011-10-29

Comparative Performance Investigations of Stochastic and Genetic Algorithms Under Fast Dynamically Changing Environment in Smart Antennas

https://ijece.iaescore.com/index.php/IJECE/article/view/5375
Jafar Ramadhan Mohammed
In a mobile communication systems, the number of observation data (snapshots) used for covariance matrix estimation can be insufficient, which often occurs due to fast dynamically changing environment or signal characteristics are rapidly changing. In these situations, the performance of the standard adaptive algorithms such as LMS are known to degrade substantially. In this paper, we propose the use of a Genetic Algorithm (GA) to perform the adaptation control of the system parameters under dynamically changing environments The GA-based beamformer has nearly optimal interference cancellation under dynamic conditions, and makes the output SINR consistently close to the optimal one regardless of the number of snapshot used. Other advantages of the GA is its simplicity and fast convergence provided that the parameters are appropriately chosen, which makes it a practical algorithm for beamforming in smart antenna. Simulation results validate substantial performance improvements relative to other standard adaptive algorithms. Although, the use of GA is not new in smart antenna technology, the performance evaluation of the genetic optimization under fast dynamically changing environment has not been investigated to the best of my knowledge and it is of great practical significance.DOI:http://dx.doi.org/10.11591/ijece.v2i1.119
Volume: 2
Issue: 1
Page: 98-105
Publish at: 2011-10-29

Buck-Converter Photovoltaic Simulator

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4874
Feri Yusivar , M. Y. Farabi , R. Suryadiningrat , W. W. Ananduta , Y. Syaifudin
This paper presents a Photovoltaic Simulator Simulation using Buck Converter with analysis using bode diagram. A state space simulator model is derived to provide a detail non-linear model. The PV Static Model is modified by adding a low pass filter in order to avoid an algebraic loop problem and able to analyze easier. PV simulator is realized by controlling buck converter’s current using PI Controller with reference from PV model. Then the model is linearized which is used for analysis purpose. The system is analyzed using bode diagram for its output voltage against its inputs of solar irradiance and cell’s temperature. The Load, Proportional Gain Kp, and Integral Gain Ki are varied to observe their effects into the system stability. It is noticed that the limits of gain stability system are so high at all values of load and gains so the Buck-Converter Photovoltaic Simulator, which is proposed here, can be declared as a robust system.DOI: http://dx.doi.org/10.11591/ijpeds.v1i2.92
Volume: 1
Issue: 2
Page: 156-167
Publish at: 2011-10-29

Simulation of a Transient Fault Controller for a Grid Connected Wind Farm with Different Types of Generators

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4877
Helmy Mohammed Abdel-Mageed , S.M. Sharaf , S.M. El_masry , M. El_harony
This paper aims to simulate a wind farm model that includes 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,  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 with the same power rating (500 kW) and subjected to the same operating conditions and faults. This paper describes the simulation of the different faults that occur along the transmission line of the power system such as single-line fault, line to line fault, double lines to ground fault, and finally three line faults. The response of the wind turbine and the different generators will be analyzed and discussed to compare the transient response of all generators at the different types of faults, where the fault period is selected to be 300 ms. The model is created in MATLAB software that enables the dynamic and static simulations of electric, electromagnetic and electromechanical systems. The machines are standard blocks in the software library.Keywords: transient faults, wind farm, simulation model.DOI: http://dx.doi.org/10.11591/ijpeds.v1i2.104
Volume: 1
Issue: 2
Page: 179-189
Publish at: 2011-10-29

Simulation of the Different Transmission Line Faults for a Grid Connected Wind Farm with Different Types of Generators

https://ijece.iaescore.com/index.php/IJECE/article/view/5369
Helmy Mohammed Abdel-Mageed
This paper aims to simulate a wind farm model that includes a wind turbine and three different types of generators , which are three-phase synchronous generator, three-phase squirrel-cage induction generatorand 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, 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 with thesame power rating (500 kw) and subjected to the same operating conditions and faults. This paper describes the simulation of the differentfaults that occur along the transmission line of the power system such as single-line fault, line to line fault, double lines to ground fault, and finally three line faults. The response of the wind turbine and the different generators will be analyzed and discussed to compare the transient response of all generators at the different types of faults, where the fault period is selected to be 300 ms. The model is created in MATLAB software that enables the dynamic and static simulations of electric, electromagnetic and electromechanical systems. The machines are standard blocks in the software library.DOI:http://dx.doi.org/10.11591/ijece.v2i1.113
Volume: 2
Issue: 1
Page: 35-45
Publish at: 2011-10-29

Design and Development of Hybrid Multilevel Inverter employing Dual Reference Modulation Technique for Fuel Cell Applications

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4868
R. Seyezhai , Banuparvathy Kalpana
MultiLevel Inverter (MLI) has been recognized as an attractive topology for high voltage DC-AC conversion. This paper focuses on a new dual reference modulation technique for a hybrid multilevel inverter employing Silicon carbide (SiC) switches for fuel cell applications. The proposed modulation technique employs two reference waveforms and a single inverted sine wave as the carrier waveform. This technique is compared with the conventional dual carrier waveform in terms of output voltage spectral quality and switching losses. An experimental five-level hybrid inverter test rig has been built using SiC switches to implement the proposed algorithm. Gating signals are generated using PIC microcontroller. The performance of the inverter has been analyzed and compared with the result obtained from theory and simulation. Simulation study of Proportional Integral (PI) controller for the inverter employing the proposed modulation strategy has been done in MATLAB/SIMULINK. Keywords: Multilevel inverter, SiC , dual reference modulation, switching losses, PIDOI: http://dx.doi.org/10.11591/ijpeds.v1i2.99
Volume: 1
Issue: 2
Page: 104-112
Publish at: 2011-10-29

Comparison Analysis Of Recovery Mechanism At Mpls Network

https://ijece.iaescore.com/index.php/IJECE/article/view/33
Mohammad Yanuar Hariyawan
Multi-protocol Label Switching (MPLS) has become an attractive technology of choice for Internet backbone service providers.  MPLS features the ability to perform traffic engineering and provides support for Quality of Service traffic provisioning. To deliver reliable service, MPLS requires a set of procedures to provide protection for the traffic carried on Label Switched Paths (LSP). In this case Lable Switched Routers (LSRS) supports recovery mechanism when failure happened in the network.This paper studied about performance from usage of different techniques that can be used to reroute traffic faster then  the current IP rerouting methods in the case of a failure in a network. Local rerouting, fast reroute one to one backs up, Haskin, PSL oriented path protection and 1+1 path protection recovery mechanism was compared by given of aggregate traffic which has self-similarity character. Packet drop, rejection probability, recovery time, service disruption time and pre-reserved resources backup will be made as comparator parameter with various bitrate and different position of link failure. Packet loss, rejection probability, recovery time and service disruption time at five recovery mechanisms influenced by position of link failure to ingress. 1+1 path protection mechanism has least packet drop, but costliest way to do recovery in the case of usage resources, as traffic is sent simultaneously in two paths which disjoint. Fast reroute one to one backup is quickest way to operate protection switching recovery after 1+1 path protection mechanism. Keywords: MPLS, recovery, rerouting, self-similar traffic, protection switchingDOI:http://dx.doi.org/10.11591/ijece.v1i2.84
Volume: 1
Issue: 2
Page: 151-160
Publish at: 2011-10-29

Neuro-Fuzzy based Controller for a Three- Phase Four-Wire Shunt Active Power Filter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4873
Mridul Jha , S.P. Dubey
This paper describes the application of a novel neuro-fuzzy based control strategy which is used in order to improve the Active Power Filter (APF) dynamics to minimize the harmonics for wide range of variations of load current under various conditions. To improve dynamic behavior of a three phase four-wire shunt active power filter and its robustness under range of load variations, adaptive hysteresis band with instantaneous p-q theory is used with the inclusion of neural network filter for reference current generation and fuzzy logic controller for DC voltage control. The proposed control scheme for “split-capacitor” converter topology is simple and also capable of maintaining the compensated line currents balanced, irrespective of unbalancing in the source voltages & deviation in the capacitor voltages. The results presented in MATLAB-SIMULINK software in this paper clearly reflect the effectiveness of the proposed APF to meet the IEEE-519 standard recommendations on harmonic levels.DOI: http://dx.doi.org/10.11591/ijpeds.v1i2.93
Volume: 1
Issue: 2
Page: 148-155
Publish at: 2011-10-29

Adaptive Neuro-fuzzy Inference System Based Control of puma 600 Robot Manipulator

https://ijece.iaescore.com/index.php/IJECE/article/view/5374
Ouamri Bachir , Ahmed-Foitih Zoubir
The strong dependence of the computed torque control of dynamic model of the robot manipulator makes this one very sensitive to uncertainties of modelling and to the external disturbances. In general, the vector of Coriolis torque, centrifugal and gravity is very complicated, consequently, very difficult to modelled. Fuzzy Logic Controller can very well describe the desired system behavior with simple “if-then” relations owing the designer to derive “if-then” rules manually by trial and error. On the other hand, Neural Networks perform function approximation of a system but cannot interpret the solution obtained neither check if its solution is plausible. The two approaches are complementary. Combining them, Neural Networks will allow learning capability while Fuzzy-Logic will bring knowledge representation (Neuro-Fuzzy). This paper presents the control of puma 600 robot arm using Adaptive Neuro Fuzzy Inference System (ANFIS) based computed torque controller (type PD). Numerical simulation using the dynamic model of puma 600 robot arm shows the effectiveness of the approach in improving the computed torque method. Comparative evaluation with Fuzzy computed torque (type PD) control is presented to validate the controller design. The results presented emphasize that a satisfactory trajectory tracking precision and stabilility could be achieved using ANFIS controller than Fuzzy controller. Keywords: Fuzzy computed torque control, Robot control, Adaptive neuro-fuzzy inference system (ANFIS).DOI:http://dx.doi.org/10.11591/ijece.v2i1.116
Volume: 2
Issue: 1
Page: 90-97
Publish at: 2011-10-29

Mathematical Modeling and Simulation of Photovoltaic Cell using Matlab-Simulink Environment

https://ijece.iaescore.com/index.php/IJECE/article/view/5368
J.Surya Kumari , Ch. Sai Babu
Photovoltaic power supplied to the utility grid is gaining more and more visibility while the world’s powers demand is increases. Growing demand, advancements in semiconductor technology and magnetic materials such as high frequency inductor cores, has a significant impact on PV inverter topologies and their efficiencies, on the improvement of the control circuits on the potential of costs reduction. The user naturally wants to operate the Photovoltaic (PV) array at its highest energy conversion output by continuously utilizing the maximum available solar power of the array. The electrical system PV modules are powered by solar arrays requires special design considerations due to varying nature of the solar power generated resulting from unpredictable and sudden changes in weather conditions which change the solar irradiation level as well as the cell operating temperature. This paper, a mathematical model of a Photovoltaic (PV) cell used matlab-simulink environment, is developed and presented. The model is developed using basic circuit equations of the photovoltaic solar cells including the effects of solar irradiation and temperature changes. The main objective is to find the parameters of the nonlinear I–V equation by adjusting the curve at three points: open circuit, maximum power, and short circuit. the method finds the best I–V equation for the single-diode photovoltaic (PV) model including the effect of the series and parallel resistances–  Key words : Photovoltaic system (PV), maximum power, PV array,PV cellDOI:http://dx.doi.org/10.11591/ijece.v2i1.117
Volume: 2
Issue: 1
Page: 26-34
Publish at: 2011-10-29

An Ozone Reactor Design with Various Electrod Configurations

https://ijece.iaescore.com/index.php/IJECE/article/view/27
Agung Warsito , Abdul Syakur , Galuh Susilowati
Environmental pollution is increasing, including water pollution due to industrial and household. To overcome this, there are three main concerns, namely the policy and environmental management, environmental awareness of society, and utilization of appropriate technologies to overcome pollution. This study is an attempt to overcome the problems of environmental pollution by designing, creating, and applying appropriate technology to make Ozone reactor with high-voltage corona discharge plasma technology. There are some methods of electrod configuration, namely wire-cylinder, spiral-cylinder, wire-cylinder with Dielectric Barrier Discharge (DBD), and spiral-cylinder with DBD. Corona discharge occurs between high-voltage electrod of each configuration ionize Oxygen flowed in the reactor, thus generating plasma and forming Ozone. The test of four Ozone reactors have been done by wastewater treatment in the form of soft drink samples, obtain the fading colors of wastewater, which is increasingly fade over many cycles of waste treatment process conducted in Ozon reactor. Based on comparison of four of Ozone reactor, it is obtained waste water treatment more maximal on reactor Ozone configuration of spiral-cylinder electrod with DBD. Keywords: Ozone reactor, electrods configuration, corona discharge, wastewaterDOI:http://dx.doi.org/10.11591/ijece.v1i2.79
Volume: 1
Issue: 2
Page: 93-101
Publish at: 2011-10-29

Design Simulation Program of Runway Capacity Using Genetic Algorithm at Soekarno-Hatta

https://ijece.iaescore.com/index.php/IJECE/article/view/38
Hoga Saragih , Indra Sulistyo Wibowo , Wisnu Darjono Tulodo Utomo , Rusdianto Roestam
The purposes of this research are to calculate the capacity of runway with runway capacity simulation software using Genetic Algorithm, and to analyze the efforts which have more profound effect. To enhance the runway capacity, some strategies are researched, such as reduction of separation to meet criteria set by FAA’s rule, addition of the exit taxiway, addition of the runway according to master plan of Soekamo-Hatta Airport and changing the runway utilization strategies. Out of the four strategies, the most efficient solution is changing the runway utilization strategies and reduction in separation. However, the addition of runway has the highest capacity increase. Keywords: genetic algorithm, simulation, runway capacity.DOI:http://dx.doi.org/10.11591/ijece.v1i2.85
Volume: 1
Issue: 2
Page: 202-212
Publish at: 2011-10-29
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