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28,451 Article Results

Pressurized CF3I-CO2 Gas Mixture under Lightning Impulse and its Solid By-Products

10.11591/ijece.v7i6.pp3088-3094
M. S. Kamarudin , A. Haddad , B. C. Kok , N. A. M. Jamail
This paper describes tests results on the CF3I-CO2 gas mixtures as an alternative for SF6 gas as to be used as insulating medium in high voltage applications. Pressurized CF3I-CO2 gas mixtures are subject under standard lightning impulse voltages at both positive and negative polarities. Under rod-plane configuration, the electrode gap length and gas pressure are varied accordingly. Upon completion of the laboratory tests, SEM and EDX analyses are carried out to assess the solid by-products. It was found that higher gas mixtures provide better insulation strength. In terms of weight, 50% of the solid by-product is found to be iodine.
Volume: 7
Issue: 6
Page: 3088-3094
Publish at: 2017-12-01

Simulation and Analysis of Multiphase Boost Converter with Soft-Switching for Renewable Energy Application

10.11591/ijpeds.v8.i4.pp1894-1902
A. A. Bakar , M.U. Wahyu , A. Ponniran , T. Taufik
This paper presents the simulation design of dc/dc interleaved boost converter with zero-voltage switching (ZVS). By employin the interleaved structure, the input current stresses to switching devices were reduced and this signified to a switching conduction loss reduction. All the parameters had been calculated theoretically. The proposed converter circuit was simulated by using MATLAB/Simulink and PSpice software programmes. The converter circuit model, with specifications of output power of 200 W, input voltage range from 10~60 V, and operates at 100 kHz switching frequency was simulated to validate the designed parameters. The results showed that the main switches of the model converter circuit achieved ZVS conditions during the interleaving operation. Consequently, the switching losses in the main switching devices were reduced. Thus, the proposed converter circuit model offers advantages of input current stress and switching loss reductions. Hence, based on the designed parameters and results, the converter model can be extended for hardware implementation.
Volume: 8
Issue: 4
Page: 1894-1902
Publish at: 2017-12-01

An Open Source Contact-Free Palm Vein Recognition System

10.11591/ijaas.v6.i4.pp319-324
Ranjith Kumar M , Deepika G G , Meenakshi Krishnan , Karthikeyan B
In this document, we propose a novel palm vein recognition system using open source hardware and software. We have developed an alternative preprocessing and feature extraction technique. The proposed system is built on Raspberry Pi using OpenCV 2.4.12. The palm vein image is cropped to Region of Interest(ROI) to reduce the computational time in real time systems and then preprocessed to enhance the vein pattern visibility and to extract more number of key points using SIFT algorithm. Then the descriptors are stored in a dictionary like codebook file during training. Later the descriptors are tested with unknown patterns. The clustering is based on K-means algorithm and classification is done using Support Vector Machines (SVM).
Volume: 6
Issue: 4
Page: 319-324
Publish at: 2017-12-01

Fault Detection & Classification in UPFC Integrated Transmission Line Using DWT

10.11591/ijpeds.v8.i4.pp1793-1803
Sanjay Kumar Mishra , Sarat Chandra Swain , Loknath Tripathy
Fault detection and classification in UPFC (Unified Power Flow Controller) integrated transmission line using single terminal based DWT (Discrete Wavelet Transform) is proposed. The current is extracted from the sending end bus and processed through wavelet transform to evaluate the spectral energy (SE) using db4 mother wavelet. Three level decomposition is framed to extract the fundamental frequency component from non-stationary signal, considering sampling frequency of 2kHz system. The fundamental frequency component of respective phase currents are used to compute SE at sending end. The SE of individual phase current is the key factor for deciding the fault pattern detection and classification. The advantage of using this it requires less cost and protect entire transmission line with minimal fault detection time. The various types of fault (L-G, L-L, L-L-G, L-L-L) are simulated by considering the parameter like fault resistance, source impedance, fault inception angle, multi-location fault, reverse power flow and UPFC system parameter. The scheme works reliable and efficient to detect and classify the fault within a cycle of sample period 40 or a cycle of time period 20ms compared to other conventional relaying scheme.
Volume: 8
Issue: 4
Page: 1793-1803
Publish at: 2017-12-01

Smart Gas Outflow Detection and Safety Circumstance System Using Cloud Technology

10.11591/ijeecs.v8.i3.pp721-725
Srikanth Kottalanka , D. Arivazhagan
The project aim is to design and develop a cloud connected smart LPG gas cylinder platform, acting as a safety device for detecting LPG gas drip at minimum levels to avoid any credible incidents. It is also capable of detect fire exists in the area and level of the gas in order to provide real time monitoring and alert over Cloud server. If an aberrant condition is detected, the device gives an alert to the smartphone app of the user and also sends an alert e-mail to other authorities. In addition to this upon detecting a gas leakage or a fire breakout, the device automatically takes safety precautionary measures, like gas valve closing, ventilation opening, fire sprinkler activation and home electrical power supply cut-off. The device connects to the internet via Wi-Fi and thus increasing the mobility of the platform within the premises of the house. A Wi-Fi capable ARM Cortex-M4 Launchpad is used to execute the system. This device proposes a complete, low-cost, powerful and accessible way of real-time tracking and distant control of gas leakages and preventive mechanisms in household and industrial areas.
Volume: 8
Issue: 3
Page: 721-725
Publish at: 2017-12-01

A Concept of Virtual-Flux Direct Power Control of Three-Phase AC-DC Converter

10.11591/ijpeds.v8.i4.pp1776-1784
Nor Azizah Mohd Yusoff , Azziddin M. Razali , Kasrul Abdul Karim , Tole Sutikno , Auzani Jidin
This paper presents a proposed technique of virtual-flux direct power control (VF-DPC) as the improvement in control method from the basic of conventional direct power control (DPC) for front-end three-phase pulse width modulated (PWM) in ac-dc converter. Three sensors in order to measure the three phase input voltage have been eliminated in the proposed method of virtual flux (VF) regarding from the estimation technique. Theoritical principles of VF-DPC are discussed in this paper. The steady-state performance of VF-DPC and conventional DPC are evaluated and presented in this work to estinguish for the excellent performance. It is shown that the VF-DPC exhibits the several advantages, particularly in providing low total harmonic distortion with almost sinusoudal of input current and unity power factor (pf) operation under balanced three phase voltage supply. The simulation results from both methods through Matlab simulation have demonstrated the outstanding performance of the new proposed control technique from VF-DPC.
Volume: 8
Issue: 4
Page: 1776-1784
Publish at: 2017-12-01

A Study on 3-phase Interleaved DC-DC Boost Converter Structure and Operation for Input Current Stress Reduction

10.11591/ijpeds.v8.i4.pp1948-1953
M. A. Harimon , A. Ponniran , A. N. Kasiran , H. H. Hamzah
This paper analyses a 3-phase interleaved DC-DC boost converter for the conversion of low input voltage with high input current to higher DC output voltage. The operation of the 3-phase interleaved DC-DC boost converter with multi-parallel of boost converters is controlled by interleaved of switching signals with 120 degrees phase-shifted. Therefore, with this circuit configuraion, high input current is evenly shared among the parallel units and consequently the current stress is reduced on the circuit and semiconductor devices and contributes reduction of overall losses. The simulation and hardware results show that the current stress and the semiconductor conduction losses were reduced approximately 33% and 32%, respectively in the 3-phase interleaved DC-DC boost converter compared to the conventional DC-DC boost converters. Furthermore, the use of interleaving technique with continuous conduction mode on DC-DC boost converters is reducing input current and output voltage ripples to increase reliability and efficiency of boost converters.
Volume: 8
Issue: 4
Page: 1948-1953
Publish at: 2017-12-01

Adapting Sources of Middle School Mathematics Self-Efficacy Scale to Turkish Culture

10.11591/ijere.v6i4.10771
Hakkı Kontas , Bahadır Ozcan
The purpose of this study was to adapt the Sources of Middle School Mathematics Self-Efficacy Scale developed by Usher and Pajares to Turkish culture. This scale assesses Bandura’s theorized sources of self-efficacy among mathematics students in middle school. After the Turkish version of the scale was formed, it was applied 6th, 7th and 8th grades 282 middle school students (157 girls and 125 boys). Results of Confirmatory Factor Analysis (CFA) showed good fit indeces; χ2/sd= 2.25, RMSEA= .06, CFI= .98, NNFI= .97 and SRMR= .05. These values indicated that the proposed four factor model was acceptable for this Turkish sampling. The reliability coefficient estimated by Cronbach alpha was found; mastery experience α= .86, vicarious experience α= .75, social persuasions α= .94, physiological state α= .91. Also the reliability coefficient estimated by split-half was found; mastery experience α= .81, vicarious experience α= .73, social persuasions α= .92, physiological state α= .89. Deciding on stability of the scale test-retest applied to 36 studens for 16 days interval. Results showed that mastery experience r= .67, vicarious experience r= .48, social persuasions r= .63, physiological state r= .41. These values indicated that this scale is a reliable instrument for Turkish sampling. In conlusion, Sources of Mathematics Self-Efficacy Scale is a valid and reliable instrument to meeasure sources of mathematics self-efficacy for middle school students in Turkish culture.
Volume: 6
Issue: 4
Page: 288-294
Publish at: 2017-12-01

Design of an Improved MPPT Control of DFIG Wind Turbine under Unbalanced Grid Voltage using a Flux Sliding Mode Observer

10.11591/ijpeds.v8.i4.pp1723-1731
Youssef Majdoub , Ahmed Abbou , Mohamed Akherraz , Rachid El Akhrif
This study presents a control scheme of the electronic interface of a grid connected Variable Speed Wind Energy Generation System (VS-WEGS) based on a Doubly Fed Induction Generator (DFIG). The efficiency of the wind energy is represented to according to the control strategy applied. Thus, in the case of unbalanced grid voltage, the negative sequence voltage causes additional strong oscillation at twice the grid frequency in the stator instantaneous active and reactive powers. The objective of this work is to present an enhanced MPPT controller uses backstepping approach implemented in both  and   reference frames rotating to keep a safe operation of DFIG during unbalanced grid voltage associated with regulating rotor flux, in order to estimate rotor flux, a nonlinear observer based on sliding mode is proposed in this work. Note that the conventional controllers (PI, PI-R …) are not provided satisfactory performance during unbalanced voltage dips. The validation of results has been performed through simulation studies on a 4 kW DFIG using Matlab/Simulink®.
Volume: 8
Issue: 4
Page: 1723-1731
Publish at: 2017-12-01

Digital Control for a PV Powered BLDC Motor

10.11591/ijpeds.v8.i4.pp1714-1722
Slamet Riyadi
Stand-alone applications of Photovoltaic (PV) can be found in water pumping systems for rural area. The proper electric motor must be chosen for optimal considerations. One of the modern electric motor called brushless motor (BLDC) can be an alternative for this application although it has complexity in control. Powering such a motor by using electric energy generating by PV modules will be an interesting problem. In this paper, a PV powered BLDC motor system is proposed. The PV modules must produce maximum power at any instant time and then this power must be able to rotate the motor. By combining sequential stator energizing due to a rotor detection and a PWM concept, the speed of BLDC can be controlled. Meanwhile, to get maximum power of PV modules, detection of voltage and current of the modules are required to be calculated. Digital Signal Control (DSC) is implemented to handle this control strategy and locks the width of the PWM signal to maintain the PV modules under maximum power operation. The effectiveness of the proposed system has been verified by simulation works. Finally the experimental works were done to validate.
Volume: 8
Issue: 4
Page: 1714-1722
Publish at: 2017-12-01

Performance Analysis of FPGA based Diode Clamped Multilevel Inverter Fed Induction Motor Drive using Phase Opposition Disposition Multicarrier Based Modulation Strategy

10.11591/ijpeds.v8.i4.pp1512-1523
Nunsavath Susheela , Satish Kumar
Multilevel inverters (MLI) are becoming more popular over the years for medium and high power applications because of its significant merits over two level inverters. This paper presents an implementation of multicarrier based sinusoidal pulse width modulation technique for three phase seven level diode clamped multilevel inverter.  This topology is operated under phase opposition disposition pulse width modulation technique. The performance of three phase seven level diode clamped inverter is analyzed for induction motor (IM) load.  Simulation is performed using MATLAB/SIMULINK. Experimental results are presented to validate the effectiveness of the operation of the diode clamped multilevel inverter using field programmable gate array.
Volume: 8
Issue: 4
Page: 1512-1523
Publish at: 2017-12-01

Factors Associated with Motorcycle Risk Behavior among Thai University Students, Khon Kaen

10.11591/ijere.v6i4.9419
Yudha Puratmaja , Lina Handayani , Kartika Setyaningsih Sunardi
The aim of this research was to assess motorcycle risk behavior (MRB) among Thai students in Khon Kaen University. The research used a cross sectional study. Fifty Thai students recruited using purposive sample technique and the chi-square test was used to analyze relationship between characteristic associated with MRB. The most common MRB were making U-turn (38%), sometimes driving above the speed limit (36%), driving with more than two passanger (48%) and sometimes not wearing helmet (36%). The result showed that sex and riding history associated with MRB (Psex < 0.05; Priding history < 0.05). Sex and riding history were significantly associated with MRB. Improving knowledge is important to decrease risky motorcycle driving behavior. Additionally, the need to provide intervention programs, promotion, and awareness related to student’s safety riding behavior could be recommended, from this information.
Volume: 6
Issue: 4
Page: 270-276
Publish at: 2017-12-01

Analysis of Competition Fronting the Popularity of Content in Social Networks

10.11591/ijict.v6i3.pp189-198
Hamid Garmani , Mohamed El Amrani , Mohamed Baslam , Rachid El Ayachi
In the telecommunications domain they are several providers, but customers seeking those that there are good services. In this paper, a study is seeking on two types of providers: content providers CPs and Internet Service Providers ISPs. In this study, we analyzed the impact of Selfishness of Content Providers and Internet Service Providers on their strategies of Price and QoS on their decision strategies. Yet, we formulate our problem as a non-cooperative game among multiple CPs, multiple ISPs competing for the same market. We prove through a detailed analysis uniqueness of pure Nash Equilibrium (NE). Furthermore, a fully distributed algorithm to converge to the NE point is presented. In order to quantify how efficient is the NE point, a detailed analysis of the Price of Anarchy (PoA) is adopted to ensure the performance of the system at equilibrium. Finally, we provide an extensive numerical study to point out the importance of QoS and credibility in the market and the in-fluence of the existing economic relationship between content providers and Internet service providers.
Volume: 6
Issue: 3
Page: 189-198
Publish at: 2017-12-01

Transformer Exchanging with Vacuum Electrical Switch

10.11591/ijeecs.v8.i3.pp679-680
Anu Priya. K.R , Sasilatha T
This paper presents investigation of conceivable transient overvoltage that can be produced amid vacuum electrical switch (VCB) operation at the association purpose of a photovoltaic power plant. Average exchanging occasion that is identified with VCB concerns stimulation and de-empowerment of emptied transformer. Nonetheless, at the common photovoltaic power plant the transformer is sustained by an inverter outfitted with LC (or LCL) channels that are important for constraint of music and swell in voltage and current. From the perspective of exchanging operations, the inductance and capacitance of the LV side associated channel influence the regular recurrence of the transformer, which is reflected by various transient framework reaction amid VCB working. In this article, research facility estimation of overvoltage produced amid dispersion transformer exchanging by methods for VCB is examined. Effect of the LC channel associated at the LV side on the overvoltage concealment was contemplated. EMTP-ATP recreations were directed with a specific end goal to confirm the likelihood of homeless people end by methods for extra arrangement associated RL gag at the transformer medium voltage side.
Volume: 8
Issue: 3
Page: 679-680
Publish at: 2017-12-01

A Conceptual Framework Curriculum Evaluation Electrical Engineering Education

10.11591/ijere.v6i4.7624
Nurulita Imansari , Eddy Sutadji
This evaluation is a conceptual framework that has been analyzed in the hope that can help research related an evaluation of the curriculum. The Model of evaluation used was CIPPO model. CIPPO Model consists of context, input, process, product, and outcomes. On the dimension of the context includes the vision and mission of the study program, the purpose of the study program. On the input, dimension consists of learning achievements, curriculum structure, qualified lecturer, and course outline. On the dimensions of the process consists of academic activities, implementation of industry practice, PPL and KKN, facilities and infrastructure, learning strategies, resources and learning media and also learning evaluation. On the product, dimension consists of the value of the GPA and dimension outcomes consist of skills match the needs of the working world.
Volume: 6
Issue: 4
Page: 265-269
Publish at: 2017-12-01
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