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31,456 Article Results

Voltage Instability of Initiation Fault Duration as Influenced by Nodes Short Circuit Levels NSCL with Different Types of Loads

10.11591/ijece.v6i3.pp1305-1318
Youssef Ahmed Mobarak , Mahmoud M. Hussein
The occurrence of voltage instabilities or voltage collapses depend on the duration of the persistence of the fault and on the type of fault, some faults lead to voltage instabilities, others lead to voltage collapse. Evaluation of fault durations causing occurrence of voltage instabilities is the main goal of this paper. This paper searches for the effect of nodes short circuit levels NSCL and its duration periods initiation of voltage instability, with lagging and leading load power factors at certain loads buses. In this paper, the power system dynamic simulation program is developed for dynamic analysis of voltage stability. This paper is concerned with the fault duration which lead to the occurrence of voltage instability phenomena due to NSCL. The fault which lead to voltage instability is found to be short circuits at certain nodes cleared without any variation in the transmission system elements, i.e. the post-fault conditions will be the same as the pre-fault conditions. Models for loads considered in this study are induction motors with three different shaft mechanical loads, constant impedance CZ loads, constant current CI loads and constant power CP loads are used, as they depict the behavior of most power system loads. The influence of the transmission network impedances, which are nearly the inverse of the NSCL, on the fault duration which lead to the occurrence of voltage instabilities are studied and evaluated using various load representations.
Volume: 6
Issue: 3
Page: 1305-1318
Publish at: 2016-06-01

Using STATCOM with Energy Storage to Enhance the Stability of AC-DC Hybrid System

10.12928/telkomnika.v14i2.2372
Zheng; Wuhan University Xu , Ding; Wuhan University Jianyong , Li; Huazhong University of Science and Technology Mei , Zhao; Huazhong University of Science and Technology Shuang , Zeng; Huazhong University of Science and Technology Ni , Zhu; Huazhong University of Science and Technology Ruoxi , Zhang; Huazhong University of Science and Technology Buhan , Mao; Huazhong University of Science and Technology Chengxiong
UHVDC has been rapidly developed for its large conveying capacity, small net loss and easy power control, which can solve the problem of the uneven distribution of load and energy with great economy. However, with DC transmission access, the power system must have a strong ability of reactive power support to cope with the possibility of transient voltage problem. At the same time, regional power oscillation issue also can’t be ignored. Considering that the STATCOM device, as a type of parallel FACTS, can only provide dynamic reactive power to support the system voltage and cannot undertake active regulation and control to damp system power oscillation problem, STATCOM with energy storage is presented in this paper to solve both problem of transient voltage and power oscillation in AC-DC hybrid system. In view of the central China province power grid planning, possible serious faults of the system were analyzed. The simulation results show that STATCOM with energy storage cannot only effectively support the system transient voltage and promote voltage of dc inverter station to avoid DC block caused by commutation failure, but also can significantly enhance the system damping and restrain regional power oscillation in case of system failure.
Volume: 14
Issue: 2
Page: 423-430
Publish at: 2016-06-01

A Self-adaptive Multipeak Artificial Immune Genetic Algorithm

10.12928/telkomnika.v14i2.2753
Qingzhao; Suzhou University Li , Fei; Suzhou University Jiang
Genetic algorithm is a global probability search algorithm developed by simulating the biological natural selection and genetic evolution mechanism and it has excellent global search ability, however, in practical applications, premature convergence occurs easily in the genetic algorithm. This paper proposes an self-adaptive multi-peak immune genetic algorithm (SMIGA) and this algorithm integrates immunity thought in the biology immune system into the evolutionary process of genetic algorithm, uses self-adaptive dynamic vaccination and provides a downtime criterion, the selection strategy of immune vaccine and the construction method of immune operators so as to promote the population develop towards the optimization trend and suppress the degeneracy phenomenon in the optimization by using the feature information in a selective and purposive manner. The simulation experiment shows that the method of this paper can better solve the optimization problem of multi-peak functions, realize global optimum search, overcome the prematurity problem of the antibody population and improve the effectiveness and robustness of optimization.
Volume: 14
Issue: 2
Page: 647-654
Publish at: 2016-06-01

Load Balancing Techniques for Efficient Traffic Management in Cloud Environment

10.11591/ijece.v6i3.pp963-973
Talasila Sasidhar , Vani Havisha , Sai Koushik , Mani Deep , V Krishna Reddy
Cloud computing is an internet based computing. This computing paradigm has enhanced the use of network where the capability of one node can be utilized by other node. Cloud service provides access on demand to distributive resources such as database, servers, software, infrastructure etc. in pay as you go basis. Load balancing is one of the vexing issues in distributed environment. Resources of service provider need to balance the load of client request. Load balancing is adapted in order to increase the resource consumption in Data centers that leads to enhance the overall performance of system achieving client satisfaction.
Volume: 6
Issue: 3
Page: 963-973
Publish at: 2016-06-01

Field Oriented Control of PMSM Supplied by Photovoltaic Source

10.11591/ijece.v6i3.pp1233-1247
Mehimmedetsi Boudjemaa , Chenni Rachid
The Permanent magnet synchronous motor (PMSM) is suitable for so much application, such as traction, aeronautics and generally in industrial automated processes. In our work, we will study the application of PMSM in renewable energies especially solar pumping. Our objective is to model the complete system, including the photovoltaic inverter, PMSM and the centrifugal pump under Matlab/Simulink environment. Solar panels generate electrical energy as direct current by direct conversion of solar radiation using semiconductor materials made of monocrystalline, polycrystalline or amorphous silicon. The energy received depends on radiation and on ambient temperature. The permanent magnet synchronous motor (PMSM) is not stable in open loop. To control the PMSM in terms of speed, torque or position, we need to implement vector control.We will establish the field oriented control of a PMSM supplied by photovoltaic source with a focus on their applications in variable speed domain.
Volume: 6
Issue: 3
Page: 1233-1247
Publish at: 2016-06-01

WhatsApp, Viber and Telegram which is Best for Instant Messaging?

10.11591/ijece.v6i3.pp909-914
Tole Sutikno , Lina Handayani , Deris Stiawan , Munawar Agus Riyadi , Imam Much Ibnu Subroto
There are many free instant messengers available now which allow to communicate with friends with text, phone call, video, sharing of files, in group or not and keep contact with them even internationally. But only very few of the instant messengers have gained a popularity and attention. Recent studies have shown that the most popular instant messengers are WhatsApp, Viber and Telegram. Even, Facebook acquired WhatsApp due to have huge users. Viber is another messenger with many integrated features that allows the phone calls and sends the text messages for free and there is no subscription like WhatsApp. While Telegram offers the users an open-source platform with no ads, a clean fast interface, asks for no payments whatsoever and the biggest selling point is security. WhatsApp, Viber and Telegram which instant messenger is best? The popularity of Telegram has reached at the top of Google play store and become the most downloaded messaging app in the world today. But at the moment WhatsApp is still the winner!
Volume: 6
Issue: 3
Page: 909-914
Publish at: 2016-06-01

Academic Cloud ERP Quality Assessment Model

10.11591/ijece.v6i3.pp1038-1047
Kridanto Surendro , Olivia Olivia
In the past few decades, educational institutions have been using conventional academic ERP system to integrate and optimize their business process. In this delivery model, each educational institutions are responsible of their own data, installation, and also maintenance. For some institutions, it might cause not only waste of resources, but also problems in management and financial aspects. Cloud-based Academic ERP, a SaaS-based ERP system, begin to come as a solution with is virtualization technology. It allows institutions to use only the needed ERP resources, without any specific installation, integration, or maintenance needs. As the implementation of Cloud ERP increases, problems arise on how to evaluate this system. Current evaluation approaches are either only evaluating the cloud computing aspects or only evaluating the software quality aspects. This paper proposes an assessment model for Cloud ERP system, considering both software quality characteristics and cloud computing attributes to help strategic decision makers evaluate academic Cloud ERP system.
Volume: 6
Issue: 3
Page: 1038-1047
Publish at: 2016-06-01

Design and analysis of Micro-Cantilever based Biosensor for Swine flu Detection

10.11591/ijece.v6i3.pp1190-1196
M.G.G. Jithendra Prasad , Shameem Syed
Swine flu which comes under the category of influenza is caused by N1H1 virus. This Disease in 2009 was termed as pandemic by WHO (World Health Organisation). It was fast spreading almost all over the world then. It is same as normal Flu and can be prevented by flu shots/vaccines. The real importance of the disease is because , it may cause serious health conditions like Pneumonia, Respiratory asthma, bronchitis different types of mucus line cancers ,unlike normal flu. Sometimes human life can be endangered by post effects of Swine flu. According to a study Infant mortality is because due to lack of detection of diseases. Thus Detection of Swine flu virus, which is cause for infant mortality is important. This can be done using the most trusted form by using MEMS. In this paper the Micro-Cantilever is used as the sensing unit. Using COMSOL 4.3b, we designed rectangular cantilever and also a rectangle with a hole punched forming SCR (Stress Concentration Region) concept, analysed and optimized.
Volume: 6
Issue: 3
Page: 1190-1196
Publish at: 2016-06-01

AC Interference on Gas Pipeline due to Phase to Ground Faults in Overhead Transmission Line

10.11591/ijece.v6i3.pp1363-1370
Ali I. El Gayar , Zulkurnain Abdul-Malek
The purpose of this research is to investigate the severity of voltages induced on gas pipeline installed in parallel to a 115 kV overhead transmission line. The overhead transmission line (OHTL) is configured as a single-circuit. One of the phases exposed to single phase to ground fault. Transmission of high voltage along the same right of way (ROW) with metallic conductor may possibly introduce interference on metallic conductors such as gas pipeline (GPL) due to power frequency voltage as well as due to phase faults and switching phenomena. Two main approaches were used to compute the induced voltages, namely the method of moment (MOM), which is based on electromagnetic field theory, and circuit based method. The simulation considers the length of OHTL and GPL are 30 km and 10km respectively. The pipeline buried at 1 m underground in homogenous earth structure with various soil resistivites ranged from 10 to 1000 Ω-m. The transmission line consists of 150 towers and 200 m span length. The separation distance between the GPL and OHTL is varied from 5 to 100 m. The phase to ground fault current changed from 0.5 to 10 kA. Several observation points are made throughout the corridor, to examinant the induced voltages at different locations. The result show that, the soil resistivity, separation distance, and fault current had significant effect on pipeline induced voltage. In case of the observation points lying on the soil or on the outer surface of the pipeline coating, the induced voltage increased, when the soil resistivity increase, as expected. In case of the observation points placed inside the pipeline metal, and the pipeline is well coated, the induced voltage will decreased, when the soil resistivity increase.
Volume: 6
Issue: 3
Page: 1363-1370
Publish at: 2016-06-01

H-WEMA: A New Approach of Double Exponential Smoothing Method

10.12928/telkomnika.v14i2.3096
Seng; Universitas Multimedia Nusantara Hansun , Subanar; Universitas Gadjah Mada Subanar
A popular smoothing technique commonly used in time series analysis is double exponential smoothing. Basically, it’s an improvement of simple exponential smoothing which does the exponential filter process twice. Many researchers had developed the technique, hence Brown’s double exponential smoothing and Holt’s double exponential smoothing. Here, we introduce a new approach of double exponential smoothing, called H-WEMA, which combines the calculation of weighting factor in weighted moving average with Holt’s double exponential smoothing method. The proposed method will then be tested on Jakarta Stock Exchange (JKSE) composite index data. The accuracy and robustness level of the proposed method will then be examined by using mean square error and mean absolute percentage error criteria, and be compared to other conventional methods.
Volume: 14
Issue: 2
Page: 772-777
Publish at: 2016-06-01

Identification of Tuna and Mackerel based on DNA Barcodes using Support Vector Machine

10.12928/telkomnika.v14i2.2469
Mulyati; Bogor Agricultural University Mulyati , Wisnu Ananta; Bogor Agricultural University Kusuma , Mala; Bogor Agricultural University Nurilmala
Tuna and mackerel are important fish in Indonesia that have great demand in the community and contain good nutrients for health. Many of the processed products have been faked including processed fish, by replacing the content of products that have high sales value to other lower price one. For ensuring food safety, fraudulent should be prevented by identifying the content of refined product. In this research, we implemented support vector machine (SVM), one of the popular methods in machine learning, to yield a model for identifying the content of refined product based on DNA barcode sequences. The feature extraction of DNA barcode Sequences was conducted by calculating k-mers frequency of each sequences. In this study, we used trinucleotide (3-mers) and tetranucleotide (4-mers). These features were inputted to SVM to classify and identify whether the DNA barcode sequences belong to the class of tuna, mackerel, or other fish. The evaluation results showed model SVM was able to perform identification with the accuracy 88%.
Volume: 14
Issue: 2
Page: 778-783
Publish at: 2016-06-01

Switch Configuration Effect on Stray Capacitance in Electrical Capacitance Volume Tomography Hardware

10.12928/telkomnika.v14i2.3328
Arba’i; University of Indonesia Yusuf , Harry; University of Indonesia Sudibyo S , Dodi; University of Indonesia Sudiana , Agus Santoso; University of Indonesia Tamsir , Imamul; Edwar Technology Co Muttakin , Wahyu; Edwar Technology Co Widada , Warsito; Edwar Technology Co P. Taruno
Electrical capacitance volume tomography (ECVT) system uses six switches in one channel with configuration resembling “T” letter, so it is called “T-switch”. The working scheme of the switch can be explained in four different modes of operation, i.e. excitation mode, detection mode, ground mode, and floating mode. This research describes the effect of switch configuration to stray capacitance in ECVT hardware. Stray capacitance introduces parasitic signal from other sources; one of them is signal from another electrode at floating mode when the signal is still flowing to detection circuit. One channel, two channels, three channels, so on until thirty-two channels are connected to single detection circuit sequentially to investigate the effect of stray capacitance. Both simulation and experiment show the stray capacitance increases along with addition of channel corresponds to 0.046pF for each channel.
Volume: 14
Issue: 2
Page: 456-463
Publish at: 2016-06-01

Multi-source and Multi-feature Image Information Fusion Based on Compressive Sensing

10.12928/telkomnika.v14i2.2748
Qingzhao; Suzhou University Li , Fei; Suzhou University Jiang
Image fusion is a comprehensive information processing technique and its purpose is to enhance the reliability of the image via the processing of the redundant data among multiple images, improve the image definition and information content through fusion of the complementary information of multiple images so as to obtain the information of the objective or the scene in a more accurate, reliable and comprehensive manner. This paper uses the sparse representation method of compressive sensing theory, proposes a multi-source and multi-feature image information fusion method based on compressive sensing in accordance with the features of image fusion, performs sparsification processing on the source image with K-SVD algorithm and OMP algorithm to transfer from spatial domain to frequency domain and decomposes into low-frequency part and high-frequency park. Then it fuses with different fusion rules and the experimental results prove that the method of this paper is better than the traditional methods and it can obtain better fusion effects.
Volume: 14
Issue: 2
Page: 607-612
Publish at: 2016-06-01

Hybrid Disk Drive Configuration on Database Server Virtualization

10.11591/ijeecs.v2.i3.pp720-728
Ferdy Nirwansyah , Suharjito Suharjito
SSD is a revolutionary new storage technologies. Enterprise storage system using full SSD is still very expensive, while HDD is still widely used. This study discusses hybrid configuration storage in virtualized server database with benchmark against four hybrid storage configuration for four databases, ORACLE, SQL Server, MySQL and PostgreSQL on Windows Server virtualization. Benchmark using TPC-C and TPC-H to get the best performance of four configurations were tested. The results of this study indicate HDD storage configurations as visual disk drive OS and SSD as visual disk drives database get better performance as OLTP and OLAP database server compared with SSD as visual disk drive OS and HDD as a visual disk drive database. Based on the data research TPC-C, OLTP get best performance at HDD storage configurations as visual disk drive OS and SSD as a visual disk drives database and temporary files.
Volume: 2
Issue: 3
Page: 720-728
Publish at: 2016-06-01

A Review on Back-to-Back Converters in Permanent Magnet Synchronous Generator based Wind Energy Conversion System

10.11591/ijeecs.v2.i3.pp583-591
Karthikrajan Senthilnathan , K. Iyswarya Annapoorani
This paper presents a review on the application of back-to-back converters in the field of Permanent Magnet Synchronous Generator (PMSG) based Wind Energy Conversion Systems (WECS). The wide applications of the back-to-back converters are power conditioning devices, micro grid, High Voltage Direct Current (HVDC), Renewable energy systems. The intention is to present an overview about the design considerations taken by various researchers in back-to-back converters in the field of Wind Energy Conversion Systems (WECS) and recent developments on it. Generally the configuration of back-to-back converters used are 12 pulse Voltage Source Converters (VSC), 12 pulse Current Source Converter (CSC), 9 Pulse Voltage Source Converter.
Volume: 2
Issue: 3
Page: 583-591
Publish at: 2016-06-01
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