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25,002 Article Results

A New Approach For Image Hiding Based On Contourlet Transform

https://ijece.iaescore.com/index.php/IJECE/article/view/5337
Saeed Masaebi , Amir Masoud Eftekhary Moghaddam
A new image hiding method based on the contourlet transform is proposed inthis paper. This strategy is based on storing information in high frequency subbands of contourlet transform. The embedding approach is in direction that the contourlet sub-bands have the least statistical disorder. As a result, the proposed algorithm has a higher robustness against to common steganalysis approaches. In addition, the quality of stegano image has considerably improved in comparison with related state of the art methods, with the extracted secret image having an acceptable quality. Furthermore, theexperimental results show robustness respect to Gaussian noise and otherattacks such as JPEG compression.DOI:http://dx.doi.org/10.11591/ijece.v2i5.1433
Volume: 2
Issue: 5
Page: 663-671
Publish at: 2012-10-01

Design of a Computer Code To Evaluate the Influence of the Harmonics in the Electrical Networks

https://ijece.iaescore.com/index.php/IJECE/article/view/5341
A. Souli , A. Hellal
This paper aims to present the design of a computer code (HPFCODE), forcalculate a power flow and power losses in power systems under theinfluence of harmonics, using the GUI in MATLAB. After described theprogram was run for two networks IEEE 6 nodes and IEEE 14 nodes. Thepower flow by Newton-Raphson method was calculated as the losses ofactive and reactive power in the lines, respectively, where the loads arelinear and nonlinear (Static Var Compensator(SVC), Thyristor controlledReactor(TCR), and Unified Power Flow Controller ((UPFC)), The resultswere almost consistent and show the influence of higher harmonics onpower losses in electrical networks.DOI:http://dx.doi.org/10.11591/ijece.v2i5.1465
Volume: 2
Issue: 5
Page: 681-690
Publish at: 2012-10-01

Design and Characterization of Compact Microstrip Patch Antenna Using “Split Ring” Shaped Metamaterial Structure

https://ijece.iaescore.com/index.php/IJECE/article/view/5335
Bimal Garg , Pramod k Singhal
Authors analyzed and explored asignificant concept of micro-strip patch antennaconfigured by double negative left handedmetamaterial which have dielectric permittivity &magnetic permeability both negative simultaneously.Basic aim of this paper is to explain thegeneral properties of rectangular micro-strippatch antenna with metamaterial structure likereturn loss, bandwidth, directivity and gain. Inthis paper authors have compared the return loss,bandwidth & gain of the micro-strip patchantenna at a frequency of 2GHz and height of 3.2mm from the ground plane with “SPLIT RING”Shaped double negative left-handed metamaterial.It has been observed that the return loss hasimproved by 20dB. The complex permittivity andpermeability of the proposed structure has beenextracted by Nicolson-Ross-Weir (NRW)approach.DOI:http://dx.doi.org/10.11591/ijece.v2i5.788
Volume: 2
Issue: 5
Page: 655-662
Publish at: 2012-10-01

765 kV Transmission Line Design (Electrical Section)

https://ijece.iaescore.com/index.php/IJECE/article/view/5345
Aydin Sakhavati , Mostafa Yaltagiani , Shirin Saleh Ahari , Seyed Mahdi Mahaei
Nowadays, due to the ever increasing energy consumption and power supply optimization, it is required to construct new power plants, substations and transmission lines. In Iran, also, because of increasing demand for electrical energy, for a significant power loss reduction in power transmission over long distances, and to construct high transmission lines that lead to reduction in the economic costs of transmission lines, the transmission lines must be considered at extra high voltage (EHV) levels. These EHV levels should be compared with the low voltage levels in order to extract the benefits. Therefore, in this paper, a review has been conducted on the types of 765 kV transmission lines used in different countries and a comparison between them and the low voltage levels have been performed. Accordingly, the advantages of EHV transmission lines are summarized. Finally, designing a line of 765 kV single-circuit with 6 conductors per bundle based on existing standards is presented.DOI:http://dx.doi.org/10.11591/ijece.v2i5.1591
Volume: 2
Issue: 5
Page: 698-707
Publish at: 2012-10-01

A novel method for extracting and recognizing logos

https://ijece.iaescore.com/index.php/IJECE/article/view/5316
Arash Asefnezhad , Karim Faez
Nowadays, the high volume of archival documents has made it exigent to store documents in electronic databases. A text logo represents the ownership of the text, and different texts can be categorized by it; for this reason, different methods have been presented for extracting and recognizing logos. The methods presented earlier, suffer problems such as, error of logo detection and recognition and slow speed. The proposed method of this study is composed of three sections: In the first section, the exact position of the logo can be identified by the pyramidal tree structure and horizontal and vertical analysis, and in the second section, the logo can be extracted through the algorithm of the boundary extension of feature rectangles. In the third section, after normalizing the size of the logo and eliminating the skew angle, for feature extraction, we first blocked the region encompassing the logo, and then we extract a particular feature by the parameter of the center of gravity of connected component each block. Finally, we use the KNN classification for the recognition of the logo.DOI:http://dx.doi.org/10.11591/ijece.v2i5.1292
Volume: 2
Issue: 5
Page: 577-588
Publish at: 2012-09-18

Optimum Remedial Operation of Permanent Magnet Synchronous Motor

https://ijece.iaescore.com/index.php/IJECE/article/view/5326
Hamdy Mohamed Soliman , S. M. EL. Hakim
In critical systems, the reliability of the drive is very important. The faults are unwanted. The faults may be lead to loss of the human life and capital. This paper is addressed this problem and suggested two models to solve it. The first model doesn’t contain any special tools to improve the torque ripple and THD. The second model contains 2PI current controllers to improvement the performance at fault and remedial operation. One is for the torque and the other is for the flux. The first PI controller is feeding from the torque error between the reference and estimated torques to get new q-axis current component representing modifier current arises from uncertain things inside the machine and drive system such as temperature and parameters variations. This current will add to reference q-axis current to get robust new q-axis current to satisfy the drive requirement and solve the torque problem (ripple torque). With robust current, the total harmonic distortion is a decrease but doesn’t reach the best value so the other PI controller is used to adjust the THD. In this PI controller, the d-axis flux is compared to rotor permanent magnet flux to solve this problem arises from non-sinusoidal of the magnetic flux. The output of the PI controller is introduced to the reference d-axis current. The new d-axis current will reach the best value of THD. The simulation of the second controller is compared to the simulation of first controller to show if the second controller strong or weak. Matlab simulink is used to simulate the drive system.DOI:http://dx.doi.org/10.11591/ijece.v2i5.725
Volume: 2
Issue: 5
Page: 621-631
Publish at: 2012-09-18

Hilbert Transform Based Adaptive ECG R-Peak Detection Technique

https://ijece.iaescore.com/index.php/IJECE/article/view/5331
Nikunj Makwana , Nikunj Hasmukhbhai Makwana , Nishant Mishra , Balwalli Sagar
In this paper we introduce a R-peak detection algorithm using the Hilbert transform for electrocardiogram processing. This algorithm uses the envelope obtained from Hilbert transform to detect the R-peaks in the ECG signal. The algorithm adaptively determines the threshold for peak determination. This technique minimizes the unwanted effects of large peaked T and P waves. Main advantage of this algorithm is that it performs extremely well in the pragmatic presence of noise.DOI:http://dx.doi.org/10.11591/ijece.v2i5.1439
Volume: 2
Issue: 5
Page: 639-643
Publish at: 2012-09-18

Single-Phase PFC Converter for Plug-in Hybrid Electric Vehicle Battery Chargers

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4911
Shakil Ahamed Khan , Md. Ismail Hossain , Mousumi Aktar
In this paper, a front end ac–dc power factor correction topology is proposed for plug-in hybrid electric vehicle (PHEV) battery charging. The topology can achieve improved power quality, in terms of power factor correction, reduced total harmonic distortion at input ac mains, and precisely regulated dc output. Within this context, this paper introduces a boost converter topology for implementing digital power factor correction based on low cost digital signal controller that operates the converter in continuous conduction mode, thereby significantly reducing input current harmonics. The theoretical analysis of the proposed converter is then developed, while an experimental digital control system is used to implement the new control strategy. A detailed converter operation, analysis and control strategy are presented along with simulation and experimental results for universal ac input voltage (100–240V) to 380V dc output at up to 3.0 kW load and a power factor greater than 0.98. Experimental results show the advantages and flexibilities of the new control method for plug-in hybrid electric vehicle (PHEV) battery charging application.DOI: http://dx.doi.org/10.11591/ijpeds.v2i3.1255
Volume: 2
Issue: 3
Page: 325-332
Publish at: 2012-09-01

ANN based Hybrid Active Power Filter for Harmonics Elimination with Distorted Mains

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4902
Laxmi Devi Sahu , Satya Prakash Dubey
The present paper describes dynamic neural network controlled Hybrid Active Power Filter (HAPF) designed for harmonic compensation under variable source/load conditions. A neural network based controller is employed to extract fundamental component of current from non-sinusoidal and unbalanced source currents of the considered supply system. Hybrid filter utilizing the merits of both shunt passive filter and shunt active filter for better compensation performance is applied in this work. Simulation and analysis of three phase hybrid active power filter under balanced and unbalanced load conditions, unbalanced & distorted source conditions have been incorporated using MATLAB/ SIMULINK. The detailed simulation level results have been presented to validate the proposed methodology.Keywords: Hybrid active power filter, THD, Artificial Neural Network Controller, PI controller.DOI: http://dx.doi.org/10.11591/ijpeds.v2i3.276 
Volume: 2
Issue: 3
Page: 241-248
Publish at: 2012-09-01

Closed Loop Control of Soft Switched Interleaved Buck Converter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4910
R. Shenbagalakshmi , Sree Renga Raja
Design, Modeling and Simulation of a closed loop control is presented for Interleaved Buck Converter with Soft Switching. The features of the closed loop system are to reduce the switching losses and load current sharing among the parallel connected converters. The control system of the converter is designed using PWM technique. In order to improve the transient response and dynamic stability of the converters, the controller parameters are designed based on current mode control. Resonant components thus designed enable the application of zero current switching for both the converters connected in parallel thereby maintaining greater efficiency and minimizing voltage and current oscillations. The system analysis, design and performance are verified through simulation using MATLAB/Simulink environment. The simulation approach reveals the high speed dynamic performance of the closed loop system designed using robust PID controller. The laboratory prototype of the Buck converter is developed to verify the controller platform using PIC16F877A microcontroller.DOI: http://dx.doi.org/10.11591/ijpeds.v2i3.832
Volume: 2
Issue: 3
Page: 313-324
Publish at: 2012-09-01

Sensorless Sliding Mode Vector Control of Induction Motor Drives

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4906
Gouichiche Abdelmadjid , Boucherit Mohamed Seghir , Safa Ahmed , Messlem Youcef
In this paper we present the design of sliding mode controllers for sensorless field oriented control of induction motor. In order to improve the performance of controllers, the motor speed is controlled by sliding mode regulator with integral sliding surface. The estimated rotor speed used in speed feedback loop is calculated by an adaptive observer based on MRAS (model reference adaptive system) technique .the validity of the proposed scheme is demonstrated by experimental results.DOI: http://dx.doi.org/10.11591/ijpeds.v2i3.405
Volume: 2
Issue: 3
Page: 277-284
Publish at: 2012-09-01

Impact of Parasitic Components on EMI Generated by SMPS

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4909
Milind Madhava Jha , Kunj Behari Naik , Shyama Pad Das
The ideal switching converter whether hard switching or soft switching, produces negligible EMI. Basically, the parasitic components are responsible for the generation and propagation of EMIs. This fact cannot be verified by noise measurement of a SMPS prototype because parasitic components are an inseparable part of it. This paper describes the results of EMI noise measurement of ideal simulated converters. The parasitic components are then introduced one by one. Noise measurements are done after every addition and compared with the initial result.DOI: http://dx.doi.org/10.11591/ijpeds.v2i3.789
Volume: 2
Issue: 3
Page: 305-312
Publish at: 2012-09-01

Optimal Placement of Custom Power Devices in Power System Network to Mitigate Voltage Sag under Faults

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4905
D.K. Tanti , M.K. Verma , Brijesh Singh , O.N. Mehrotra
Voltage sag has been considered to be a serious power quality problem faced by many utilities. Placement of custom power devices may prove to be an effective remedy for solving power quality problems. In this paper, an Artificial Neural Network (ANN) based approach for optimal placement of Distribution Static Synchronous Compensator (DSTATCOM), Dynamic Voltage Restorer (DVR) and Unified Power Quality Conditioner (UPQC) in a power system network has been considered to mitigate voltage sag under faults. Voltage sag under different type of short circuits has been estimated using MATLAB/SIMULINK software. Optimal location of custom power devices has been obtained using a feed forward neural network trained by post-fault voltage magnitude of three phases at different buses. A comparative performance of DSTATCOM, DVR and UPQC in voltage sag mitigation has been studied to select most effective controller out of three controllers for the system. Case studies have been performed on IEEE 14-bus system. The effectiveness of proposed approach of placement of custom power devices has been established on the test system considered. DOI: http://dx.doi.org/10.11591/ijpeds.v2i3.370
Volume: 2
Issue: 3
Page: 267-276
Publish at: 2012-09-01

A Simple Sector Independent Space Vector Modulation Technique Implemented using a DSP Processor

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4908
Susovan Mukhopadhyay , Sujit Kumar Biswas , Nirmal kumar Deb
This paper presents the software implementation of a simple sector independent Space Vector Modulation (SVPWM) technique for simple motor drive applications using DSP processor. The closed loop control scheme with Volts/Hz principle, suitably regulates the switching period and operates with a fixed set of compare register values. The Space Vector Pulse Width Modulation hardware module on the TI TMS320LF2407A is used to produce the Pulse Width Modulated (PWM) pulses with four switching states in one PWM period. In contrast to the conventional scheme, the algorithm developed here, eliminates the computational burden involved in determining the magnitude and phase of the voltage vector, the corresponding sector and the decomposition matrices for calculating the switching time segments. A 1hp, 3 phase induction motor fed from an IGBT based inverter module is tested with the control pulses generated from the DSP processor and the performance is found to be satisfactory.DOI: http://dx.doi.org/10.11591/ijpeds.v2i3.348
Volume: 2
Issue: 3
Page: 297-304
Publish at: 2012-09-01

Simulation Based Performance analysis of Active Clamp DHB ZVZCS Bidirectional DC-DC converter for Low Power Applications

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4913
V.V.Subrahmanya Kumar Bhajana
A novel active clamp dual half bridge DC/DC converter with bidirectional power flow is proposed in this paper and comparative analysis between active clamp DHB ZVZCS and ZVS-ZCS bidirectional DC-DC converter topologies is also presented. By adding active clamping circuits to both bridges, zero voltage and zero current switching are achieved to improve the performance of the bidirectional DC/DC converter. The principle of operation is analyzed and simulated. With the proposed active clamp ZVZCS concept, the MATLAB simulation results of the applications of the fuel cell and battery have been obtained and compared with those of ZVS-ZCS bidirectional converter. The simulation results of proposed converter is compared with the ZVS-ZCS bidirectional DC-DC converter, efficiency, switching losses are the key parameters compared.DOI: http://dx.doi.org/10.11591/ijpeds.v2i3.1469
Volume: 2
Issue: 3
Page: 345-352
Publish at: 2012-09-01
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