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27,762 Article Results

Firefly Algorithm to Opmimal Distribution of Reactive Power Compensation Units

10.11591/ijece.v8i3.pp1758-1765
Vadim Z. Manusov , Pavel V. Matrenin , Lola S. Atabaeva
The issue of electric power grid mode of optimization is one of the basic directions in power engineering research. Currently, methods other than classical optimization methods based on various bio-heuristic algorithms are applied. The problems of reactive power optimization in a power grid using bio-heuristic algorithms are considered. These algorithms allow obtaining more efficient solutions as well as taking into account several criteria. The Firefly algorithm is adapted to optimize the placement of reactive power sources as well as to select their values. A key feature of the proposed modification of the Firefly algorithm is the solution for the multi-objective optimization problem. Algorithms based on a bio-heuristic process can find a neighborhood of global extreme, so a local gradient descent in the neighborhood is applied for a more accurate solution of the problem. Comparison of gradient descent, Firefly algorithm and Firefly algorithm with gradient descent is carried out.
Volume: 8
Issue: 3
Page: 1758-1765
Publish at: 2018-06-01

Design of Solar Powered Charging Backpack

10.11591/ijpeds.v9.i2.pp848-858
Jonas Taverne , Firdaus Muhammad-Sukki , Ahmad Syahir Ayub , Nazmi Sellami , Siti Hawa Abu-Bakar , Nurul Aini Bani , Abdullahi Abubakar Mas’ud , Draco Iyi
This paper demonstrated a step by step process in designing a solar powered charging backpack that is capable of charging a mobile phone efficiently. A selection of existing products available on the market were reviewed and compared to ascertain the cost, size, and output capabilities. Next, the solar cell types and regulators were compared and their respective merits were also investigated. The charging system was then designed and tested before being integrated with the backpack. The results clearly showed that the system managed to charge the mobile phone. However, it was found that the excessive power dissipation has caused the linear regulator to generate significant heat.
Volume: 9
Issue: 2
Page: 848-858
Publish at: 2018-06-01

Content-based Image Retrieval System for an Image Gallery Search Application

10.11591/ijece.v8i3.pp1903-1912
Nicole Tham Ley Mai , Syahmi Syahiran Bin Ahmad Ridzuan , Zaid Bin Omar
Content-based image retrieval is a process framework that applies computer vision techniques for searching and managing large image collections more efficiently. With the growth of large digital image collections triggered by rapid advances in electronic storage capacity and computing power, there is a growing need for devices and computer systems to support efficient browsing, searching, and retrieval for image collections. Hence, the aim of this project is to develop a content-based image retrieval system that can be implemented in an image gallery desktop application to allow efficient browsing through three different search modes: retrieval by image query, retrieval by facial recognition, and retrieval by text or tags. In this project, the MPEG-7-like Powered Localized Color and Edge Directivity Descriptor is used to extract the feature vectors of the image database and the facial recognition system is built around the Eigenfaces concept. A graphical user interface with the basic functionality of an image gallery application is also developed to implement the three search modes. Results show that the application is able to retrieve and display images in a collection as thumbnail previews with high retrieval accuracy and medium relevance and the computational requirements for subsequent searches were significantly reduced through the incorporation of text-based image retrieval as one of the search modes. All in all, this study introduces a simple and convenient way of offline image searches on desktop computers and provides a stepping stone to future content-based image retrieval systems built for similar purposes.
Volume: 8
Issue: 3
Page: 1903-1912
Publish at: 2018-06-01

Application and Comparison Between the Conventional Methods and PSO Method for Maximum Power Point Extraction in Photovoltaic Systems Under Partial Shading Conditions

10.11591/ijpeds.v9.i2.pp631-640
Bennis Ghita , Karim Mohammed , Lagrioui Ahmed
Several algorithms have been offered to track the Maximum Power Point when we have one maximum power point. Moreover, fuzzy control and neural was utilized to track the Maximum Power Point when we have multi-peaks power points. In this paper, we will propose an improved Maximum Power Point tracking method for the photovoltaic system utilizing a modified PSO algorithm. The main advantage of the method is the decreasing of the steady state oscillation (to practically zero) once the Maximum Power Point is located. moreover, the proposed method has the ability to track the Maximum Power Point for the extreme environmental condition that cause the presence of maximum multi-power points, for example, partial shading condition and large fluctuations of insolation. To evaluate the effectiveness of the proposed method, MATLAB simulations are carried out under very challenging circumstance, namely step changes in irradiance, step changes in load, and partial shading of the Photovoltaic array. Finally, its performance is compared with the perturbation and observation” and fuzzy logic results for the single peak, and the neural-fuzzy control results for the multi-peaks.
Volume: 9
Issue: 2
Page: 631-640
Publish at: 2018-06-01

Performance Analysis of Differential Beamforming in Decentralized Networks

10.11591/ijece.v8i3.pp1692-1700
Samer Alabed
This paper proposes and analyzes a novel differential distributed beamforming strategy for decentralized two-way relay networks. In our strategy, the phases of the received signals at all relays are synchronized without requiring channel feedback or training symbols. Bit error rate (BER) expressions of the proposed strategy are provided for coherent and differential M-PSK modulation. Upper bounds, lower bounds, and simple approximations of the BER are also derived. Based on the theoretical and simulated BER performance, the proposed strategy offers a high system performance and low decoding complexity and delay without requiring channel state information at any transmitting or receiving antenna. Furthermore, the simple approximation of the BER upper bound shows that the proposed strategy enjoys the full diversity gain which is equal to the number of transmitting antennas.
Volume: 8
Issue: 3
Page: 1692-1700
Publish at: 2018-06-01

Analysing Mobile Random Early Detection for Congestion Control in Mobile Ad-hoc Network

10.11591/ijece.v8i3.pp1305-1314
Saurabh Sharma , Dipti Jindal , Rashi Agarwal
This research paper suggests and analyse a technique for congestion control in mobile ad hoc networks. The technique is based on a new hybrid approach that uses clustering and queuing techniques. In clustering, in general cluster head transfers the data, following a queuing method based on a RED (Random Early Detection), the mobile environment makes it Mobile RED (or MRED), It majorly depends upon mobility of nodes and mobile environments leads to unpredictable queue size. To simulate this technique, the Network Simulator 2 (or NS2) is used for various scenarios. The simulated results are compared with NRED (Neighbourhood Random Early Detection) queuing technique of congestion control. It has been observed that the results are improved using MRED comparatively.
Volume: 8
Issue: 3
Page: 1305-1314
Publish at: 2018-06-01

Modeling and Simulation of Grid Connected Hybrid Energy System and its Fault Analysis

10.11591/ijpeds.v9.i2.pp775-783
Sujit Kumar Bhuyan , Prakash Kumar Hota , Bhagabata Panda
This paper represents a hybrid energy system (HES) consisting of photovoltaic (PV), Solid Oxide Fuel Cell (SOFC), electrolyzer system and a storage tank. In this proposed system a fuel cell controller is used where a PID controller is utilized to control the flow of hydrogen (H2) through the valve to the SOFC to fulfill the load requirement. In this model a supervisory controller is used to regulate the whole system according to load requirement. So, when PV power is more than load requirement, then PV power fulfill the required load demand as well as the extra power of PV is utilized to generate the hydrogen (H2) by the help of electrolyzer, further this hydrogen is used as a fuel of SOFC. Also in this proposed model different types of faults are considered and verified their effect on the load as well as in distribution network. The computer simulations are done for the purpose technology and verified its effectiveness. Hence the appropriate results are obtained.
Volume: 9
Issue: 2
Page: 775-783
Publish at: 2018-06-01

A New Seven Level Symmetrical Inverter with Reduced Switch Count

10.11591/ijpeds.v9.i2.pp921-925
Thiyagarajan V. , Somasundaram P.
Multilevel inverters offers less distortion and less electro-magnetic interference compared with other conventional inverters and hence, it can be used in many industrial and commercial applications.  This paper analyze the performance of the modified single phase seven level symmetrical inverter using minimum number of switches. The proposed topology consists of six switches and two dc sources, and produces seven level output voltage waveform during symmetric operation. The cost and size of the propsoed inverter minimum as it uses minimum number of components, The performance of the proposed multilevel inverter is analysed for different switching angles and the corresponding simulation results are presented. The simulation of the proposed inverter is carried out using MATLAB/Simulink software.
Volume: 9
Issue: 2
Page: 921-925
Publish at: 2018-06-01

Modeling, Control and Power Management Strategy of a Grid connected Hybrid Energy System

10.11591/ijece.v8i3.pp1345-1356
Sujit Kumar Bhuyan , Prakash Kumar Hota , Bhagabat Panda
This paper presents the detailed modeling of various components of a grid connected hybrid energy system (HES) consisting of a photovoltaic (PV) system, a solid oxide fuel cell (SOFC), an electrolyzer and a hydrogen storage tank with a power flow controller. Also, a valve controlled by the proposed controller decides how much amount of fuel is consumed by fuel cell according to the load demand. In this paper fuel cell is used instead of battery bank because fuel cell is free from pollution. The control and power management strategies are also developed. When the PV power is sufficient then it can fulfill the load demand as well as feeds the extra power to the electrolyzer. By using the electrolyzer, the hydrogen is generated from the water and stored in storage tank and this hydrogen act as a fuel to SOFC. If the availability of the power from the PV system cannot fulfill the load demand, then the fuel cell fulfills the required load demand. The SOFC takes required amount of hydrogen as fuel, which is controlled by the PID controller through a valve. Effectiveness of this technology is verified by the help of computer simulations in MATLAB/SIMULINK environment under various loading conditions and promising results are obtained.
Volume: 8
Issue: 3
Page: 1345-1356
Publish at: 2018-06-01

Selection of Digital Filter for Microprocessor Protection Relays

10.11591/ijece.v8i3.pp1498-1512
Denis B. Solovev
The article considers some issues related to replacement of electromechanical relays used for protection of power facilities with microprocessor relays. One of the urgent problems connected with implementation of microprocessor overcurrent protections is how to use current transducers other than usual current transformers and in particular Rogowski coils that become more and more widespread. In the article are compared twelve methods of synthesis of a digital filter basing on the analog prototype – second-order integrating filter. The bilinear filter and Boxer-Thaler filters are analyzed in respect to their use in microprocessor relays. Basing on the research results a technique for selection of parameters of digital integrating filters for microprocessor relays is proposed. Simulation results show that Boxer-Thaler and bilinear filters have better accuracy during transient current measurements than the analog filter. The study allows concluding that in many cases the digital second-order bilinear filter is the best choice for use in microprocessor relays.
Volume: 8
Issue: 3
Page: 1498-1512
Publish at: 2018-06-01

A Novel Design of a Microstrip Microwave Power Amplifier for DCS Application using Collector-Feedback Bias

10.11591/ijece.v8i3.pp1647-1653
Amine Rachakh , Larbi El Abdellaoui , Jamal Zbitou , Ahmed Errkik , Abdelali Tajmouati , Mohamed Latrach
This paper presents a 1.80GHz class-A Microwave power amplifier (PA). The proposed power amplifier is designed with single-stage architecture. This power amplifier consists of a bipolar transistor and improved by Collector-Feedback Biasing fed with a single power supply. The aim of this work is to improve the performance of this amplifier by using simple stubs with 50Ω microstrip transmissions lines. The proposed PA is investigated and optimized by utilizing Advanced Design System (ADS) software. The simulation results show that the amplifier achieves a high power gain of 13dB, output power rise up to 21dBm and good impedances matching ;For the input reflection coefficient (S11) is below than - 46.39dB. Regarding the output reflection coefficient (S22) is below than -29.898dB, with an overall size of about 93 x 59mm². By the end; we find that this power amplifier offers an excellent performance for DCS applications.
Volume: 8
Issue: 3
Page: 1647-1653
Publish at: 2018-06-01

Performance Measures of Positive Output Superlift Luo Converter Using Multitudinous Controller

10.11591/ijpeds.v9.i2.pp704-711
Sivagami Ponnalagarsamy , N. M. Jothi Swaroopan
In order to meet the increase in energy demand globally it is necessary to harness renewable energy at its maximum potential for the purpose of electric power generation. For the achievement of high output voltage and efficiency DC-DC converters plays a vital role in low voltage PV array and fuel cells. LUO converters are gaining importance because of geometric progression output. . LUO converters find its application because of high transient performance of the system, high power transfer gain, efficiency  and  reduced ripple .Because of load and line disturbances the output voltage of DC-DC converter must be operated in closed loop mode. This paper interpolates multitudinous controller for positive output elementary super lift LUO converter (POESLL). The pursuance of the converter under manifold such as variation in input, load are developed and compared for current mode controller and   SMC.
Volume: 9
Issue: 2
Page: 704-711
Publish at: 2018-06-01

An Empirical Study on Peer-to-Peer Sharing of Resources in Mobile Cloud Environment

10.11591/ijece.v8i3.pp1933-1938
R. K. Nadesh , M. Aramudhan
The increase usage of mobile users with internet and interoperability among the cloud services intensifies the role of distributed environemtnt in today’s real world application. Modern technologies are important for building rich, scalable and interoperable applications. To meet the requirements of client,the cloud service provider should offer adequate infrastructure especially under heavy multi-client load.To provide solution for large scale requirements and to statisfy the mobile client from the critical situation like lacking with bandwidth,connectivity issues,service completion ratio, we present adhoc virtual cloud model  for different scenarios that include single and multiple client configurations with various file sizes of various file formats for retrieving files in the mobile cloud environement.We evaluate the strategies with the socket and RMI implemented using java and identify the best model for real world applications. Performance evaluation is done with the results obtained and recommends that when sockets and RMI can be appropriately used in peer-to-peer environment when the mobile user cannot connect directly to the cloud services.
Volume: 8
Issue: 3
Page: 1933-1938
Publish at: 2018-06-01

The Security Challenges of the Rhythmprint Authentication

10.11591/ijece.v8i3.pp1281-1287
Nakinthorn Wongnarukane , Pramote Kuacharoen
The Rhythmprint authentication combines an advantage of the traditional keystroke authentication and the multi-touch technology based on a touchable device such as touchpad on a laptop, a smartphone and a tablet. With the Rhythmprint authentication, the user is less likely to suffer from shoulder surfing and eavesdropping attacks. This research provides empirical evidence to verify the security performance of the Rhythmprint authentication comparing to the traditional keystroke authentication for shoulder surfing and eavesdropping attacks, when the user tries to login to a website on a laptop for 10 times in a public place while the attacker stands behind. The experimental results show that the Rhythmprint authentication provides higher security than the traditional keystroke authentication in both shoulder surfing and eavesdropping attacks.
Volume: 8
Issue: 3
Page: 1281-1287
Publish at: 2018-06-01

A Wideband mm-Wave Printed Dipole Antenna for 5G Applications

10.11591/ijeecs.v10.i3.pp943-950
Dewan Atiqur Rahman , Sarah Yasmin Mohamad , Norun Abdul Malek , Dewan Arifur Rahman , Siti Normi Zabri
In this paper, a wideband millimeter-wave (mm-Wave) printed dipole antenna is proposed to be used for fifth generation (5G) communications. The single element antenna exhibits a 36 GHz bandwidth with more than 85.71% fractional bandwidth (for S11 <-10 dB) which covers six of the 5G candidate frequencies; 24 GHz, 25 GHz, 28 GHz, 32 GHz, 38 GHz and 40 GHz. The antenna also exhibits an average gain of 5.34 dB with a compact size of 7.35 x 5.85 mm2. The antenna is further designed to be an array with eight elements and manage to increase the gain of the antenna with an average of 12.63 dB, a fractional bandwidth of 81.48% and linearly-polarized radiation pattern. 
Volume: 10
Issue: 3
Page: 943-950
Publish at: 2018-06-01
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