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28,188 Article Results

Frequency Dependence of Electroluminescence Measurement in LDPE

10.11591/ijece.v7i3.pp1406-1413
Nurul Aini Bani , Zulkurnain Abdul-Malek , Siti Armiza Mohd Aris , Siti Zura A. Jalil , Mohd Nabil Muhtazaruddin , Hazilah Mad Kaidi , Sharipah Alwiah Syed Abd Rahman , Firdaus Muhammad-Sukki , Abdullahi Abubakar Mas’ud , Siti Hawa Abu-Bakar , Jorge Alfredo Ardilla Rey
A good insulator for high voltage cable has low dielectric loss, reasonable flexibility and thermo-mechanically stable. However, prolonged application of electrical stresses on the cable will degraded the cable; physically and morphologically. Electrical degradation in high voltage cable can be detected using electroluminescence (EL) method. Electroluminescence is a phenomenon that occurs when the atoms of a material are being excited due to the application of and external high electrical stresses. There are several external factors that affect the behaviour of electroluminescence emission such as, applied voltage, applied frequency, ageing of material and types of materials. . In this paper, the EL measurement is employed to determine the effect of applied frequency on virgin LDPE at fixed and varying applied voltage. It can be observed that EL emission increases as applied frequency increases with increasing voltage applied. However, interesting EL behaviour is observed when varying frequency is applied from 10 Hz to 100 Hz.
Volume: 7
Issue: 3
Page: 1406-1413
Publish at: 2017-06-01

Investigation of Slim Type BLDC Motor Drive with Torque Ripple Minimization using Abridged Space-Vector PWM Control Method

10.11591/ijpeds.v8.i2.pp593-600
C. Bharatiraja , Shyam Babu , V. Krishnakumar , P. Sanjeevikumar , Nixon George
Brushless DC (BLDC) motors are becoming an increasingly popular motor of choice for its unique characteristics. The BLDC motor drive is assumed to have trapezoidal back-electromotive force (EMF), rectangular phase currents and together produces the desired torque. However, practical back-EMF waveform might not be exactly trapezoidal because of current ripple, design considerations and manufacturing limitations. The adverse effect is the torque ripple generated due to the current ripple that causes mechanical vibration, acoustic noise and affects the accuracy of speed and position control which is not desirable in motor operation. In this paper an algorithm is developed to control and minimize the generated torque ripple using Space Vector Pulse Width Modulation (SVPWM) scheme. The efficiency improvement of slim type BLDC motor is confirmed using MATLAB environment and low cost TI Piccolo F28035 microcontroller (MC).
Volume: 8
Issue: 2
Page: 593-600
Publish at: 2017-06-01

Characteristics of Mineral Oil-based Nanofluids for Power Transformer Application

10.11591/ijece.v7i3.pp1530-1537
I. H. Zakaria , M. H. Ahmad , Y. Z. Arief , N. A. Awang , N .A. Ahmad
Trends in the field of nanomaterial-based transformer oil show most of the conducted works have focused only on the transformer oil-based nanofluids but limited studies on the stability of transformer oil-based nanofluids. Since mineral oil-based nanofluids still can produce the sedimentation, thus the cold-atmospheric pressure plasma method is proposed to functionally modify the Silicon Dioxide (SiO2) nanofiller in order to enhance the electrical properties of the mineral oil-based nanofluids. The AC breakdown strength oil samples before and after modification were measured. It was found that the plasma treated nanofluids have higher AC breakdown voltage compared to pure oil and untreated nanofluids. Also, Fourier Transform Infrared (FTIR) Spectroscopy has been used in this study to analyse the physical changes of oil samples. It is envisaged that the added silica nanofiller has significant effect on electrical properties of the transformer oil-based nanofluids which would enable to the development of an improved class of liquid dielectric for the application of power transformer.
Volume: 7
Issue: 3
Page: 1530-1537
Publish at: 2017-06-01

ZVS Full Bridge Series Resonant Boost Converter with Series-Connected Transformer

10.11591/ijpeds.v8.i2.pp812-825
Mohamed Salem , Awang Jusoh , N.Rumzi N. Idris , Tole Sutikno , Iftikhar Abid
This paper presents a study on a new full bridge series resonant converter (SRC) with wide zero voltage switching (ZVS) range, and higher output voltage. The high frequency transformer is connected in series with the LC series resonant tank. The tank inductance is therefore increased; all switches having the ability to turn on at ZVS, with lower switching frequency than the LC tank resonant frequency. Moreover, the step-up high frequency (HF) transformer design steps are introduced in order to increase the output voltage to overcome the gain limitation of the conventional SRC. Compared to the conventional SRC, the proposed converter has higher energy conversion, able to increase the ZVS range by 36%, and provide much higher output power. Finally, the a laboratory prototypes of the both converters with the same resonant tank parameters and input voltage are examined based on 1 and 2.2 kW power respectively, for veryfing  the reliability of the performance and the operation principles of both converters.
Volume: 8
Issue: 2
Page: 812-825
Publish at: 2017-06-01

Power Factor Correction with Current Controlled Buck Converter for BLDC Motor Drive

10.11591/ijpeds.v8.i2.pp730-738
P. Sarala , S. F. Kodad , B. Sarvesh
Brushless DC motor is a synchronous machine that makes use of electronic commutation instead of mechanical commutator. Brushless DC motors makes use of inverter encompassing static switches for its operation. A simple bridge converter when used for BLDC drive as front end converter makes input source power factor to get reduced which is unacceptable in the power system. To avoid the distortions in the source voltage and source currents, Buck converter which was used as power factor correction (PFC) converter in this paper to improve the power factor. Presence of power electronic converters deteriorates system power factor effecting overall system performance. This paper presents buck converter for power factor correction in brushless DC motor drive system. Buck converter is operated with current control strategy rather to conventional voltage follower control. Simulation model was obtained using MATLAB/SIMULINK software and the brushless DC motor performance characteristics were shown for conditions with different DC link voltages and step variation in DC link voltage. Total harmonic distortion in source current was also presented.
Volume: 8
Issue: 2
Page: 730-738
Publish at: 2017-06-01

Optimise Energy Cost for Air Conditioning based on the Market Price under Demand Side Response Model

10.11591/ijece.v7i3.pp1125-1132
Marwan Marwan , Syafaruddin Syafaruddin
The increasing contribution of air conditioning (AC) to energy consumption has received considerable attention in the past and will continue to do so in the coming years, from Indonesian government, state electricity company and consumers. Managing demand on the electricity system in peak sessions is the most direct way to address the AC peak demand issue. The aim of this research is to developed a consumer demand side response (DSR) model to assist both electricity consumers/aggregator and electricity provider to minimise energy cost if peak price occured in the peak season. The proposed model allows consumers to independently and proactively manage air conditioning load through an aggregator. This research examines how the control system applies DSR model if a price spike may occur at 18.00 during one hour. The results indicate, consumer and aggregator could gain collective benefits when the consumer controls the air conditioning under the DSR program. The model was tested in Makassar City South Sulawesi considering to the caharacteristic of the room and air conditioning in a residential house.
Volume: 7
Issue: 3
Page: 1125-1132
Publish at: 2017-06-01

Understanding of Antecedents to Achieve Customer Trust and Customer Intention to Purchase E-Commerce in Social Media, an Empirical Assessment

10.11591/ijece.v7i3.pp1240-1245
Taqwa Hariguna , Berlilana Berlilana
This study aims to analyze empirically three factors antecedents of trust they are system quality, information quality, and service quality. Customer trust is used in determining customer intention to purchase of e-commerce in social media (facebook). A number of respondents were 451. The results of this study concluded that three factors antecedents of trust directly had a positive impact to customer trust and indirectly had positive impact on customer intention to purchase in e-commerce transactions on social media.
Volume: 7
Issue: 3
Page: 1240-1245
Publish at: 2017-06-01

Solving Task Scheduling Problem in Cloud Computing Environment Using Orthogonal Taguchi-Cat Algorithm

10.11591/ijece.v7i3.pp1489-1497
Danlami Gabi , Abdul Samad Ismail , Anazida Zainal , Zalmiyah Zakaria
In cloud computing datacenter, task execution delay is no longer accidental. In recent times, a number of artificial intelligence scheduling techniques are proposed and applied to reduce task execution delay. In this study, we proposed an algorithm called Orthogonal Taguchi Based-Cat Swarm Optimization (OTB-CSO) to minimize total task execution time. In our proposed algorithm Taguchi Orthogonal approach was incorporated at CSO tracing mode for best task mapping on VMs with minimum execution time. The proposed algorithm was implemented on CloudSim tool and evaluated based on makespan metric. Experimental results showed for 20VMs used, proposed OTB-CSO was able to minimize makespan of total tasks scheduled across VMs with 42.86%, 34.57% and 2.58% improvement over Minimum and Maximum Job First (Min-Max), Particle Swarm Optimization with Linear Descending Inertia Weight (PSO-LDIW) and Hybrid Particle Swarm Optimization with Simulated Annealing (HPSO-SA) algorithms. Results obtained showed OTB-CSO is effective to optimize task scheduling and improve overall cloud computing performance with better system utilization.
Volume: 7
Issue: 3
Page: 1489-1497
Publish at: 2017-06-01

Transitional Particle Swarm Optimization

10.11591/ijece.v7i3.pp1611-1619
Nor Azlina Ab Aziz , Zuwairie Ibrahim , Marizan Mubin , Sophan Wahyudi Nawawi , Nor Hidayati Abdul Aziz
A new variation of particle swarm optimization (PSO) termed as transitional PSO (T-PSO) is proposed here. T-PSO attempts to improve PSO via its iteration strategy. Traditionally, PSO adopts either the synchronous or the asynchronous iteration strategy. Both of these iteration strategies have their own strengths and weaknesses. The synchronous strategy has reputation of better exploitation while asynchronous strategy is stronger in exploration. The particles of T-PSO start with asynchronous update to encourage more exploration at the start of the search. If no better solution is found for a number of iteration, the iteration strategy is changed to synchronous update to allow fine tuning by the particles. The results show that T-PSO is ranked better than the traditional PSOs.
Volume: 7
Issue: 3
Page: 1611-1619
Publish at: 2017-06-01

Vibration Analysis of Tapered Pole Linear Switched Reluctance Machine

10.11591/ijpeds.v8.i2.pp957-962
Lenin N C , Arvind S V
The Vibration is one of the major problem in linear switched reluctance motors (LSRMs). This paper present a detailed analysis of vibration in a two phase LSRM and proposes a new structure to reduce the effect. The experimental results of this paper prove that the proposed structure is well suited for conveyor application.
Volume: 8
Issue: 2
Page: 957-962
Publish at: 2017-06-01

Cost-Effective Medical Robotic Telepresence Solution using Plastic Mannequin

10.11591/ijece.v7i3.pp1212-1218
Victor O. Matthews , Segun I. Popoola , Aderemi A. Atayero , Emmanuel Adetiba , Joke A. Badejo
Robotic telepresence is an Information and Communication Technology (ICT) solution that has a huge potential to address the problem of access to quality healthcare delivery in rural areas. However, the capital and operating costs of available systems are considered to be unffordable for rural dwellers in emerging economies. In addition, most of these communities are not even connected to the power grid. In this paper, the authors reduced the cost of engaging a robotic telepresence solution for rural medicare by using plastic mannequin and solar photovoltaic technology. An IP camera was fixed in each of the eye sockets of the plastic mannequin. These cameras are connected to a mini-computer embedded in the plastic mannequin. A Wi-Fi module establishes an Internet connection between remote physicians and rural heathcare facilities. The system is powered by a solar photovoltaic energy source to guarantee power availability. Another unique feature of this solution is that it gives the patient a better impression of the physical presence of a physician. Comparative cost analysis with robotic telepresence available in the market showed that our system is more affordable. This development will increase the adoption of robotic telepresense in rural telemedicine.
Volume: 7
Issue: 3
Page: 1212-1218
Publish at: 2017-06-01

An Enhanced Queue Management Scheme for Eradicating Congestion of TFRC over Wired Environment

10.11591/ijece.v7i3.pp1347-1354
N. Ramanjaneya Reddy , Chenna Reddy Pakanati , M. Padmavathamma
To accomplish increasing real time requirements, user applications have to send different kinds of data with different speeds over the internet.  To effectuate the aims of the computer networks, several protocols have been added to TCP/IP protocol suite.  Transport layer has to implement emerging techniques to transfer huge amount of data like multimedia streaming. To transmit multimedia applications, one of the suitable congestion control mechanisms in transport layer is TCP Friendly Rate Control Protocol (TFRC).  It controls congestion based on its equation. To get more smoothed throughput, intermediate nodes (like Routers. etc.) have to use suitable procedures in all real time situations. To eradicate the level of congestion in the network, we introduce enhanced Holt-Winters equations to RED queue management algorithm and applied to TFRC. The simulation results have shown that this strategy reduces packet loss and increases throughput.
Volume: 7
Issue: 3
Page: 1347-1354
Publish at: 2017-06-01

The Ab-initio Study of Bulk Single Layer Defected Graphene Towards Graphene Device

10.11591/ijece.v7i3.pp1444-1451
Marriatyi Morsin , Yusmeeraz Yusof
Graphene is a promising new material for the construction of graphene devices because of its surface modification can be tuned the band gap. In this paper, the electronic and transport characteristics of defected graphene device are investigated. Both the electronic and transport characteristics are simulated using density functional theory (DFT). The band structures and transmission spectra are analyzed. The conductance and thermal conductance characteristic for both graphene is compared. From the simulation, it is found that the conductance, thermal conductance, and the I-V curves depend on the transmission spectrum of the graphene sheet or graphene device itself. The comparison between the defected graphene itself shows that the single layer with two vacancies shows better performance.
Volume: 7
Issue: 3
Page: 1444-1451
Publish at: 2017-06-01

An Advanced MPPT Based on Artificial Bee Colony Algorithm for MPPT Photovoltaic System under Partial Shading Condition

10.11591/ijpeds.v8.i2.pp647-653
Salmi Hassan , Badri Abdelmajid , Zegrari Mourad , Sahel Aicha , Baghdad Abdenaceur
Maximum power point tracking (MPPT) algorithms are employed in photovoltaic (PV) systems to make full utilization of PV array output power, which have a complex relationship between ambient temperature and solar irradiation. The power-voltage characteristic of PV array operating under partial shading conditions (PSC) exhibits multiple local maximum power points (LMPP). In this paper, an advanced algorithm has been presented to track the global maximum power point (GMPP) of PV. Compared with the Perturb and Observe (P&O) techniques, the algorithm proposed the advantages of determining the location of GMPP whether partial shading is present.
Volume: 8
Issue: 2
Page: 647-653
Publish at: 2017-06-01

Comparison of Multicarrier PWM Techniques for Cascaded H-Bridge Multilevel Inverter

10.11591/ijpeds.v8.i2.pp861-868
Hashim Hasabelrasul , Xiangwu Yan
One of the preferred choices of electronic power conversion for high power applications are multilevel inverters topologies finding increased attention in industry. Cascaded H-Bridge multilevel inverter is one of these topologies reaching the higher output voltage, power level and higher reliability due to its modular topology. Level Shifted Carrier Pulse Width Modulation (LSCPWM) and Phase Shifted Carrier Pulse Width Modulation are used generally for switching cascaded H-bridge (CHB) multilevel inverters. This paper compares LSCPWM and PSCPWM in terms of total harmonics distortion (THD) and output voltage among inverter cells. Simulation for 21-level CHB inverter is carried out in MATLAB/SIMULINK and simulation results are presented.
Volume: 8
Issue: 2
Page: 861-868
Publish at: 2017-06-01
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