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25,002 Article Results

Near Optimal Convergence of Back-Propagation Method using Harmony Search Algorithm

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1462
Abdirashid Salad Nur , Nor Haizan Mohd Radzi , Siti Mariyam Shamsuddin
Training Artificial Neural Networks (ANNs) is of great significanceand a difficult task in the field of supervised learning as its performance depends on underlying training algorithm as well as the achievement of the training process. In this paper, three training algorithms namely Back-Propagation Algorithm, Harmony Search Algorithm (HSA) and hybrid BP and HSA called BPHSA are employed for the supervised training of Multi-Layer Perceptron feed  forward type of Neural Networks (NNs)  by giving special attention to hybrid BPHSA. A suitable structure for data representation of NNs is implemented to BPHSA-MLP, HSA-MLP and BP-MLP. The proposed method is empirically tested and verified using five benchmark classification problemswhich are Iris, Glass, Cancer, Wine and Thyroid dataset on training NNs. The MSE, training time, and classification accuracy of hybrid BPHSA are compared with the standard BP and meta-heuristic HSA. The experiments showed that proposed method has better results in terms of convergence error and classification accuracy compared to BP-MLP and HSA-MLPmaking the BPHSA-MLPa promising algorithm for neural network training. DOI: http://dx.doi.org/10.11591/telkomnika.v14i1.7233
Volume: 14
Issue: 1
Page: 163-172
Publish at: 2015-04-01

Experimental Evaluation and Validation of Random Pulse Position Pulse Width Modulation for Industrial Drives

10.11591/ijape.v4.i1.pp30-40
P. Arulkumar , N. P. Subramaniam
In industrial drives, random pulse width modulation (RPWM) is triumph for transferring of harmonic power from the detached spectrum of the output voltage to the unremitting spectrum, and offers the merits viz. The operation is free from an unpleasant acoustic noise and a mechanical vibration. The main objective of this paper is providing a comprehensive investigation of performance of random pulse position pulse width modulation (RPPPWM) for a three-phase voltage source inverter (VSI) fed induction motor drives. RPPWM scheme randomly varies the pulse position in every switching cycle, where the idea is inducing the random characteristics in the PWM pulses at fixed switching frequency. The competence in spreading the harmonic power of sinusoidal PWM (SPWM), random carrier PWM (RCPWM) and the RPPWM are compared using simulation. The results are corroborated through the prototype VSI designed. The developed RPPPWM based on a SPARTAN-6 FPGA (XC6SLX45) device, disperses the acoustic switching noise spectra of an induction motor drive
Volume: 4
Issue: 1
Page: 30-40
Publish at: 2015-04-01

A New Advanced Topology for Photo Voltaic Applications

10.11591/ijape.v4.i1.pp23-29
Sreedhar M , C. K. Panigrahi , Abhijit Dasgupta , J. Pati
This article proposes a high efficient DC-DC step-up converter with a single switch. This is particularly suited for Photo Voltaic (PV) applications, automotive applications, battery operated vehicles etc., in which voltage is step up from 10V to 500V. This converter operates at 100 kHz due to which switching losses are comparatively high. This topology proposes a scheme to mitigate power losses across the switch and to achieve high efficiency by Zero Current Switching (ZCS) at “Turn ON and Turn OFF” states. Proposed converter uses a single switch to reduce the losses in the converter and observed 98% of overall efficiency in the converter. The proposed converter is verified by its experimental results.
Volume: 4
Issue: 1
Page: 23-29
Publish at: 2015-04-01

Comparison Between Two-Level Converter and Three-level NPC Converter for Evaluation the Quality Power of DFIG Based Wind Turbines

10.11591/ijape.v4.i1.pp13-22
Zerzouri Nora , Labar Hocine , Kechida Sihem
This paper deals the power control for three-level voltage source inverter NPC-VSI feeds the rotor of the doubly fed induction generator ‘DFIG’ based wind power generation system. This converter allows controlling the rotor voltage in magnitude and phase angle with a high flexibility and can therefore be used for active and reactive power control of DFIG. The control is especially designed to reduce the harmonic distortion of the generated currents and active power ripples of the classical control. In addition, it’s convenient for high power drive and variable speed generator applications with constant switching frequency. The detailed operation principle and simulation results for 3 MW of DFIG are also discussed.
Volume: 4
Issue: 1
Page: 13-22
Publish at: 2015-04-01

Analysis of Solar Radiation Availability for Deployment of Solar Photovoltaic (PV) Technology in a Tropical City

10.11591/ijape.v4.i1.pp41-46
Olatona G. I , Adegoke C. W
The sunshine hours and solar radiation data for Ibadan (7° 30´ N, 3° 54´ E.), South West Nigeria in the last twenty years was analyzed, with a view to determining the abundance of solar energy available for deployment of solar photovoltaic (PV) technology applications. The measured solar radiation and actual sunshine hour data were obtained from International Institute of Tropical Agriculture (IITA), Ibadan. The data were analyzed using the statistical package of „origin 7‟ software. The maximum of 16.1MJm-2day-1 and minimum of 10.71MJm-2day-1 occurred in months of May and August respectively while the actual sunshine hour variation follows the same general trend but with the maximum of 6.99hrs in February and a minimum of 2.37hrs in August. At the current solar-to-electric conversion efficiency of 10%, the minimum solar radiation of 10.71MJm-2day-1 can supply a 1.0m2 solar panel a minimum of 44.6KWhr of Energy. Thus an abundance of solar energy has been established at Ibadan which in recent times has been witnessing incessant power outages from the national grid and thereby can contribute significantly to efforts in improving power supply mix. This implies that solar energy technology can thrive not only at Ibadan but in the whole of South West of Nigeria. Evidence of viability of PV technology in this area also abounds in the success of Solar Water Pumping stations recently installed by Government Agencies such as Ogun-Osun River Basin Development Authority (ORBDA) and the Millennium Development Goal (MDG) programmes in the area and environs.
Volume: 4
Issue: 1
Page: 41-46
Publish at: 2015-04-01

Social Network Applications and Free Online Mobile Numbers: Real Risk

10.11591/ijece.v5i2.pp175-176
Mehdi Dadkhah , Tole Sutikno , Shahaboddin Shamshirband
Social network applications are being more widely used among users and new types of such applications are created by developers. Almost all users who use smart phones are users of such application. Major concern in these applications is privacy and security. We can name WhatsApp, Viber, Facebook, Telegram, Line, WeChat and Beetalk as the most popular applications. There are also websites which provide online numbers in order to receive SMS. The goal of this website is providing anonymous virtual phone number to protect users from spam. Also these sites provide different number from different countries and let people to can use them for different application. The services of these websites are divided into two groups: subscription services in which a unique number is assigned to the user by charging him/her and free services in which user can see the received messages of some online numbers without any registration.
Volume: 5
Issue: 2
Page: 175-176
Publish at: 2015-04-01

Study in Step by Step Electric Energy Meter Connection Detection Method

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1452
Qing Zhiming , Fu Wang , Fei Wenli
Electric energy meter wiring error variety, detection method and circuit can only detect some kinds of wrong wiring at present, as the current transformer and current detection unit terminal short-circuit characteristics of conventional methods in existence, not take out stitches under the premise of not achieving detection. Based on this, this paper puts forward a step detection method, detection circuit of voltage and current lines one by one through right off and polarity of current, gradually show every junction point junction and the fault point. Through the Multisim software simulation, and developed a set of wire detecting device, simulation and experimental results prove that the method is correct. Compared with conventional methods, can be more comprehensive and faster connection detection fault location. DOI: http://dx.doi.org/10.11591/telkomnika.v14i1.7662 
Volume: 14
Issue: 1
Page: 90-96
Publish at: 2015-04-01

Hardware Implementation of FIR Neural Network for Applications in Time Series Data Prediction

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1458
Kuldeep S. Rawat , G.H. Massiha
Time series data prediction is used in several applications in the area of science and engineering. Time series prediction models have been implemented using statistical approaches, but recently, neural networks are being applied for times series prediction due to their inherent properties and capabilities. A variation of a standard neural network called as finite impulse response (FIR) neural network has proven to be highly successful in achieving higher degree of prediction accuracy when used over various time series prediction applications. These applications are time critical and involve huge amounts of computation that are slower when run on a general purpose processor and hence, a dedicated hardware is required. In this paper, authors present hardware implementation of an FIR neural network for applications in times series data prediction. The implementation is divided into (i) off-board, where the training algorithm and neural network configuration is implemented in Matrix Laboratory (MATLAB) and simulated with various benchmark time series data set and (ii) on-board, where the entire system is modeled in a hardware description language (HDL). The simulation experiment, hardware building blocks, the implementation framework, and the hardware design flow are discussed in this paper. The hardware resource utilization and timing information are also reported in the paper. DOI: http://dx.doi.org/10.11591/telkomnika.v14i1.7272 
Volume: 14
Issue: 1
Page: 130-139
Publish at: 2015-04-01

Development of Prototype model for Wireless based Controlled Pick and Place Robotic Vehicle

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1455
Low Kok Hau , Gowrishankar Kasilingam , K. Nithiyananthan
The main aim of this research work is to develop and design a proto type model for a pick and place robotic vehicle with a soft catching gripper that can be controlled by android OS for remote operation. At the transmitting end using android application device, commands are sent to the receiver to control the movement of the robotic vehicle. Meanwhile at the receiving end four motors are interfaced to the microcontroller where two for them are used for arm movement while the other two are for the body movement. The android application device transmitter will acts as a remote control while the receiver end Bluetooth device is fed to the microcontroller to drive DC motors via motor driver IC for necessary work. Remote operation is achieved by any smart phone with AndroidOS; upon a GUI (Graphical User Interface) based touch screen operation. DOI: http://dx.doi.org/10.11591/telkomnika.v14i1.7370
Volume: 14
Issue: 1
Page: 110-115
Publish at: 2015-04-01

Demand Side Energy Management for Linear Programming Method

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1450
N. Loganathan , K. Lakshmi
This paper presents an optimization method to the Demand Side Energy Management System (DSEMS) of a given consumer (e.g.an industrial compound or university campus) with respect to hourly electricity prices. The demands can be supplied through the main grid and stochastic Distributed Energy Resources (DERs), such as wind and solar power sources.  To solve this DSEMS problem and optimization algorithm based on Linear Programming (LP) approach has been implemented.  The objective of the proposed method is to maximize the utilization of the cluster of demands. This LP algorithm allows the cluster of demand to buy, store and sell energy at suitable times to adjust the hourly load level. To evaluate the performance of the proposed algorithm an IEEE 14 bus system was considered. The results shows that the cluster of demands of energy management system using the proposed approach increasing the efficiency and minimizing the losses than the existing methods. DOI: http://dx.doi.org/10.11591/telkomnika.v14i1.7570 
Volume: 14
Issue: 1
Page: 72-79
Publish at: 2015-04-01

Exploring Coal and Power Industries Integrated System in China

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1443
Xu Peng
Differences of market force of coal and power industries caused this contradiction “market for coal, electricity for plans ”. C&P (Coal and power) industries issues around dual pricing system seriously hampered the development of C&P industries. This paper used the System Dynamics method to analyze the composition, characteristics and ways to build of the C&P industries integrated energy system, building feedback causal relationships of the C&P industries integrated energy system and their subsystems. Finally, this article established System Dynamics flow diagram. The analysis showed that C&P industries need rational planning, coordinating collaboration; strengthen the government's guide and regulation, continuously improve the transport capacity between enterprises. DOI: http://dx.doi.org/10.11591/telkomnika.v14i1.7618 
Volume: 14
Issue: 1
Page: 16-23
Publish at: 2015-04-01

Robust Pitch Detection Based on Recurrence Analysis and Empirical Mode Decomposition

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1456
Jingfang Wang
A new pitch detection method is designed by the recurrence analysis in this paper, which is combined of Empirical Mode Decomposition (EMD) and Elliptic Filter (EF). The Empirical Mode Decomposition (EMD) of Hilbert-Huang Transform (HHT) are utilized tosolve the problem, and a noisy voice is first filtered on the elliptic band filter. The two Intrinsic Mode Functions (IMF) are synthesized by EMD with maximum correlation of voice, and then the pitch be easily divided. The results show that the new method performance is better than the conventional autocorrelation algorithm and cepstrum method, especially in the part that the surd and the sonant are not evident, and get a high robustness in noisy environment. DOI:  http://dx.doi.org/10.11591/telkomnika.v14i1.7216 
Volume: 14
Issue: 1
Page: 116-122
Publish at: 2015-04-01

Investigation of Neem Fatty Acid Ethyl Ester for Electric Power Generation

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1441
G. Vijaya Gowri , N. Kanagaraj , C. Muniraj
This paper presents biodiesel as an emerging renewable energy source which could meet substantially the very large growing electric energy demand maintaining the ecological balance. Biodiesel is a sustainable energy source which makes the environment out of pollution. The simplest process for biodiesel production called transesterification was carried out to produce biodiesel from neem oil. The output parameters such as speed, voltage, current and power are of the alternator are analysed for different loads using pure diesel, different biodiesel-diesel blends (80% biodiesel & 20% diesel, 60% biodiesel  & 40% diesel, 40% biodiesel & 60% diesel, 20% biodiesel  & 80% diesel) to an I.C engine. Results show that 20% biodiesel & 80% diesel blend (B20) produces the output with better efficiency. DOI: http://dx.doi.org/10.11591/telkomnika.v14i1.6978 
Volume: 14
Issue: 1
Page: 1-8
Publish at: 2015-04-01

A Modified Bat Algorithm for Power Loss Reduction in Electrical Distribution System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1448
Djossou Adeyemi Amon
Losses on Electric Distribution System lines represent a major challenge for electric distribution companies since those losses refer to the amount of electricity injected into the distribution grids that are not paid by users. Network Optimization by system reconfiguration is one of the solutions among many others used to solve this problem. In this paper a modified version of new Meta Heuristic algorithm based on Bat behavior is proposed to find the best system configuration with a low loss rate, we present two different approaches: reduction of search space and introduction of sigmoid function to fit the algorithm to the problem. The main advantages of the proposed methodology are: easy implementation and less computational efforts to find an optimal solution. To demonstrate its efficiency the proposed scheme is tested on 33 Bus distribution system and the results show loss reduction rate of 33%. DOI:  http://dx.doi.org/10.11591/telkomnika.v14i1.7629 
Volume: 14
Issue: 1
Page: 55-61
Publish at: 2015-04-01

Detection of Power Quality Disturbances in Micro Grid Connected Power System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1442
Priyadharshini K.M , S. Srinivasan , C. Srinivasan
Micro Grid is a contracted distributed AC or DC network. Micro Grid resources are connected to the distributed linear as well as nonlinear loads through power electronics converter to provide an efficient, more reliable and quality power to the distributed loads with reduced co2 emission. Consequently makes full use of low cost generation resources and reduce waste. Interconnected Mode in the MG is connected to main grid either being absorbed by it or injecting some amount of power into the main system. Islanding Mode in the MG operates separately when upstream volt occurs in main grid network. Usage of power electronic interface converters, Integration of the renewable-resources based MG system to the main power system and nonlinear loads results in harmonics generation clutter the system reliability and other associated quality issues. Most of demanding users of electricity are suffering to a certain poor quality of electrical power. The excellent time-scaling resolution characteristic of WT used for detection of various power quality disturbances of integrating and islanding Micro Grid connected Distributed Generation systems. The WT plays important role in analysis, design and classification of discrete signal processing. The accuracy and reliability of classification techniques have assessed on signals contaminated with noise. DOI:  http://dx.doi.org/10.11591/telkomnika.v14i1.7232 
Volume: 14
Issue: 1
Page: 9-15
Publish at: 2015-04-01
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