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25,002 Article Results

An Efficient Approach for Finding Near Duplicate Web pages using Minimum Weight Overlapping Method

https://ijece.iaescore.com/index.php/IJECE/article/view/36
Shine N Das , Midhun Mathew , Pramod K. Vijayaraghavan
The existence of billions of web data has severely affected the performance and reliability of web search. The presence of near duplicate web pages plays an important role in this performance degradation while integrating data from heterogeneous sources. Web mining faces huge problems due to the existence of such documents. These pages increase the index storage space and thereby increase the serving cost. By introducing efficient methods to detect and remove such documents from the Web not only decreases the computation time but also increases the relevancy of search results. We aim a novel idea for finding near duplicate web pages which can be incorporated in the field of plagiarism detection, spam detection and focused web crawling scenarios. Here we propose an efficient method for finding near duplicates of an input web page, from a huge repository. A TDW matrix based algorithm is proposed with three phases, rendering, filtering and verification, which receives an input web page and a threshold in its first phase, prefix filtering and positional filtering to reduce the size of record set in the second phase and returns an optimal set of near duplicate web pages in the verification phase by using Minimum Weight Overlapping (MWO) method. The experimental results show that our algorithm outperforms in terms of two benchmark measures, precision and recall, and a reduction in the size of competing record set.DOI:http://dx.doi.org/10.11591/ijece.v1i2.77
Volume: 1
Issue: 2
Page: 187-194
Publish at: 2011-10-29

Study of Performance of a Power Station for Operational Optimisation

https://ijece.iaescore.com/index.php/IJECE/article/view/5367
Sunil M. Jaralikar , Mangalpady Aruna
Undertaking regular performance analysis of a power station is very much necessary for its operational optimization. In this regard as a case study a 630 MVA, 400/220 kV power station was identified and analysed to study its performance. The study shows that the installed station (transformer) capacity is very large compared to the load it had to supply, and also it is under loaded and underutilized for the major period of its operation. Due to this the operational efficiency of the station was reduced and also the incoming voltage level was higher than the voltage for which the station was designed. During off peak loading condition, one of the 400 kV incoming lines was being tripped, thus risking the supply reliability. This case study emphasizes and suggests few ways for improving the performance and loading pattern of the power station by optimization of its operational parameters. Keywords: Bus reactor; Energy audit; Energy efficiency; Performance analysis; Station capacity.DOI:http://dx.doi.org/10.11591/ijece.v2i1.118
Volume: 2
Issue: 1
Page: 17-25
Publish at: 2011-10-29

An Algorithm for Real-Time Blind Image Quality Comparison and Assessment

https://ijece.iaescore.com/index.php/IJECE/article/view/5378
Ehsan Ollah Sheybani
This research aims at providing means to image comparison from different image processing algorithms for performance assessment purposes. Reconstruction of images corrupted by blur and noise requires specialized filtering techniques. Due to the immense effect of these corruptive parameters, it is often impossible to evaluate the quality of a reconstructed image produced by one technique versus another. The algorithm presented here is capable of performing this comparison analytically and quantitatively at a low computational cost (real-time) and high efficiency. The parameters used for comparison are the degree of blurriness, information content, and the amount of various types of noise associated with the reconstructed image. Based on a heuristic analysis of these parameters the algorithm assesses the reconstructed image and quantify the quality of the image by characterizing important aspects of visual quality. Extensive effort has been set forth to obtain real-world noise and blur conditions so that the various test cases presented here could justify the validity of this approach well. The tests performed on the database of images produced valid results for the algorithms consistently. This paper presents the description and validation (along with test results) of the proposed algorithm for blind image quality assessment.DOI:http://dx.doi.org/10.11591/ijece.v2i1.112  
Volume: 2
Issue: 1
Page: 120-129
Publish at: 2011-10-29

GA For Optimal PI in DC Voltage Regulation of D-STATCOM.

https://ijece.iaescore.com/index.php/IJECE/article/view/29
Perumandla Sadanandam
The performance of DSTATCOM depends on a DC capacitor voltage regulation.The regulation of DC capacitor voltage based on optimal PI coefficients. The conventional method to determine PI coefficients is trial and error method. In this paper Genetic Alogorithem is applied for exact calculation of optimized PI coefficients can carried out to reduce disturbances in DC link voltage. Optimizations and simulations are worked out in MATLAB environment. DOI:http://dx.doi.org/10.11591/ijece.v1i2.91
Volume: 1
Issue: 2
Page: 110-118
Publish at: 2011-10-29

Factors Affecting the Sheath Losses in Single-Core Underground Power Cables with Two-Points Bonding Method

https://ijece.iaescore.com/index.php/IJECE/article/view/5366
Osama Elsayed Gouda , Adel Abd-eltwab Farag
Single-core underground power cables with two-points bonding induce currents in their metallic sheaths. The sheath induced currents are undesirable and generate power losses and reduce the cable ampacity. This paper has shown that the values of the sheath losses in some cases could be greater than conductor losses, depending on various factors. Such these factors are type of cable layouts, cable parameters, cable spacing, sheath resistance, phase rotation, conductor current and cable armoring. In this paper the above factors have been investigated. The calculations are carried out depending mainly on IEC 60287 by a proposed computer program using MATLAB.Keywords: Single-core cables, two-point bonding method, sheaths losses, flat, trefoil, armoringDOI:http://dx.doi.org/10.11591/ijece.v2i1.115
Volume: 2
Issue: 1
Page: 7-16
Publish at: 2011-10-29

Space Vector Pulse Width Modulation Scheme for a Seven-Phase Voltage Source Inverter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/IJPEDS-I-1-02
Mohd. Arif Khan , Atif Iqbal , Sk Moin Ahmad
This paper analyses a simple space vector PWM (SVPWM) scheme for a seven-phase voltage source inverter. At first the conventional method of producing sinusoidal output voltage  by utilizing six active and a zero space vectors are used to synthesis the input reference and then new PWM scheme called time equivalent space vector PWM is presented.  A comparison of the proposed scheme with the conventional scheme is presented based on various performance indices. Extensive Simulation results are provided to validate the findingsDOI: http://dx.doi.org/10.11591/ijpeds.v1i1.72
Volume: 1
Issue: 1
Page: 7-20
Publish at: 2011-09-30

Unified Power Quality Conditioner for voltage sag and harmonic mitigation of nonlinear loads

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/IJPEDS-I-1-09
Y. Kusuma Latha , Ch. Saibabu , Y P Obulesu
With the wide application of nonlinear and electronically switched devices in distribution systems, the power quality problem becomes more serious. This paper deals with Unified Power Quality Condition (UPQC) which  is an integration of series active filter and shunt active filter. The main purpose of a UPQC is to compensate for current harmonics and voltage harmonics. It has the capability of improving power quality at the point of installation on power distribution systems. The paper discusses the compensation principle and different control strategies of the UPQC in detail. The performance of UPQC is examined by considering, a diode rectifier feeding an RL load (non linear load) that acts as a source of harmonics, feeding harmonics into the three-phase distribution system of concern. The performance is also observed under influence of utility side disturbances such as sag, swell, and flicker. This control strategy guarantees sinusoidal, balanced and minimized source currents even under unbalanced and / or distorted system voltages. The control strategies are modeled using MATLAB/SIMULINK and simulation results are presented to validate the proposed  control strategy.Keywords—UPQC, Power Quality,  Harmonics, Load Balancing, Power Factor Correction, MATLAB/SIMULINKDOI: http://dx.doi.org/10.11591/ijpeds.v1i1.35
Volume: 1
Issue: 1
Page: 65-74
Publish at: 2011-09-29

Dynamic Testing & Simulation of 4 KW (5.5 Hp) Switched Reluctance Motor using PSpice

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/IJPEDS-I-1-05
Rajesh Murlidharrao Autee
In this paper, the requirement of mechanical model of SR Motor for determination of dynamic characteristic is presented. The PSpice is circuit oriented software package and it is believed that no direct mechanical models are available. Therefore electrical equivalent of mechanical sub systems were used for determination of dynamic characteristics.The variable inductor model is also proposed using voltage controlled component.Index Terms – Switched Reluctance Motor, Dynamic Characteristics, TorqueDOI: http://dx.doi.org/10.11591/ijpeds.v1i1.42
Volume: 1
Issue: 1
Page: 36-40
Publish at: 2011-09-29

RNN Based Rotor Flux and Speed Estimation of Induction Motor

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/IJPEDS-I-1-08
Bambang Purwahyudi , Soebagio Soebagio , M. Ashari
Speed control of induction motor can be obtained by closed loop system which require speed sensor. Speed sensor system is less effective for wide plant system, because the sensor location is too far from the main control system and measurement result is less accurate. This paper presents the development of speed sensorless field oriented control (FOC) of induction motor by using the rotor flux and speed observers. The observers only required the stator voltage and current of induction motor to obtain the rotor flux and speed estimation. The observers based on recurrent neural network (RNN) methods are implemented. Finally, the effectiveness of the proposed method is verified by simulation. Simulation results show that RNN observer can produce well the rotor flux and speed estimation. MSE values of the rotor flux estimation are between 0.000087 and 0.000264, whereas MSE values of the speed estimation are between 43.0552 and 156.0798. Keywords: field oriented control, induction motor, observer, and recurrent neural network.DOI: http://dx.doi.org/10.11591/ijpeds.v1i1.65
Volume: 1
Issue: 1
Page: 58-64
Publish at: 2011-09-29

Fault Tolerant Control in Z-Source Inverter Fed Induction Motor

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/IJPEDS-I-1-04
B. Justus Rabi
This paper discusses about the detection and replacement of the switches in inverter under fault. The detection of switch is done through measuring the phase and line voltages of inverter. The replacement of the open switch is done through the extra arm provided in the circuit. The firing of the extra arm is done by detecting the open switch fault and interrupting the processor to provide the firing to the extra arm switch. This paper gives simple and effective detection and replacement of open switch. The replacement of switch will be done without stopping the whole system and saves the unspecified time. Simulation results are provided to demonstrate the detection and replacement. A feasible test is implemented by building a proto type three-phase impedance source inverter, which is designed and controlled on the basis of proposed considerations. It is verified from the practical point of view that this new approach is more effective and acceptable to minimize the distortion. Keywords: SMPS – Switch Mode Power Supply, pulse width modulation (PWM), VSI –Voltage Source Inverter.DOI: http://dx.doi.org/10.11591/ijpeds.v1i1.67
Volume: 1
Issue: 1
Page: 29-35
Publish at: 2011-09-29

Performance Comparison of Starting Speed Control of Induction Motor

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/IJPEDS-I-1-07
Deddy Kusbianto
In the induction motor speed control without sensors operated by the method Field Oriented Control (FOC) was required an observer to estimate the speed. Obsever methods have been developed, among others, was the method of Self-Constructing Fuzzy Neural Network (SCFNN) with some training algorithms such as backpropagasi (BP). Levenberg Marquard (LM) etc.. In the induction motor control techniques were also developed methods of Direct Torque Control (DTC) with observer Recurrent Neural Network (RNN). This paper compares the performance of the motor response to initial rotation between SCFNN observer method that uses the LM training algorithm with DTC control technique with RNN observer. From the observation performance of the motor response to initial rotation of the two methods shows that the LM method has better performances than the RNN. This can be seen on both the parameters : overshoot, rise time, settling time, peak and peak time. With the right method, can enhance better performance of the system. With the improvement of system performance, is expected to increase work efficiency in the industrial world, so overall, particularly for systems that require high precision, FNN methodcan be said to be better. Keywords: Motor Speed control without sensors, FOC, SCFNNO, DTC, Levenberg Marquardt and RNN.DOI: http://dx.doi.org/10.11591/ijpeds.v1i1.66
Volume: 1
Issue: 1
Page: 47-57
Publish at: 2011-09-29

Regeneration of ZVS converter with Resonant inductor

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/IJPEDS-I-1-03
J.Sivavara Prasad , Ch.Sai Babu , Y.P. Obelesh
This paper presents an analysis of the regeneration of zero-voltage-switching converter with resonant inductor, quasi-resonant converters, and full-bridge zero-voltage-switched PWM Converter. The design of a clamping circuit considering a saturable resonant inductor is presented and compared with the design of a clamping circuit with a linear resonant inductor. A diode model with reverse recovery is employed to simulate the effects.DOI: http://dx.doi.org/10.11591/ijpeds.v1i1.71
Volume: 1
Issue: 1
Page: 21-28
Publish at: 2011-09-29

A Novel method of Starting Induction Motor - A Comparative Study

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/IJPEDS-I-1-06
R L Chakrasali , V.R. Sheelavant , H.N. Nagaraja
Polyphase induction motor, when started from rest with full voltage impressed, the starting current is 5 to 8 or more times the rated current. The large line current drawn by such a motor is objectionable because of the possible sharp drop in voltage of the supply circuit and undesired effects upon other connected loads/devices. Accordingly it is customary to start such motors at reduced voltage by using auto transformers, star delta starters etc. This paper deals with a new approach to start poly phase induction motors without using any primary voltage compensators thereby limiting the inrush of starting current. The rotor of the motor is driven at suitable speed in the specified direction of rotation by using crank driving mechanism. Then te rated voltage is applied to the motor. This is enunciated using a case study on a 3- phase, 5hp, NGEF make motor with oscillographic records obtained from the experimentation and is compared with the various starting techniques. Keywords: Induction motor, starter, inrush current, voltage dip, new approachDOI: http://dx.doi.org/10.11591/ijpeds.v1i1.70
Volume: 1
Issue: 1
Page: 41-46
Publish at: 2011-09-29

Hysteresis Current Control technique based on Space Vector Modulation for Active Power Filter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/IJPEDS-I-1-01
Wang Yun-liang , Guo Qi-liang
In this paper, the hysteresis current control (HCC) technique based on space vector modulation (SVM) for shunt active power filter (APF) is proposed. The switching control algorithms of the HCC based SVM manage to generate compensated current according to the reference current. Harmonics extraction is based on the instantaneous active and reactive power theorem in time domain by calculating the power compensation. A closed loop control system is carried out and the error current is the difference between the reference current which is obtained from the power compensation and the actual current needs to be injected back into the power grid. By implementing this control strategy, the APF manages to generate better compensated harmonics currents to the power grid. Keywords: active power filter, hysteresis current control, space vector modulation ,matlab/simulink.DOI: http://dx.doi.org/10.11591/ijpeds.v1i1.69
Volume: 1
Issue: 1
Page: 1-6
Publish at: 2011-09-29

A Review of Voltage and Current Signature Diagnosis in Industrial Drives

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/IJPEDS-I-1-10
K. Vinoth Kumar
This paper presents the review of identify the different types of faults in the induction motor during online condition by using current and voltage signature analysis. Special attention is focused on the effect of both space distribution of rotor breakage and rotor dis-symmetry on the mechanism of generation of diagnosis signatures with the consideration of voltage supply unbalance and speed ripples. A comparison is made between the voltage signature analysis and current signature analysis. Keywords: Fault diagnosis, Induction motor, rotor breakage, MCSA, Motor voltage signature analysis (MVSA).DOI: http://dx.doi.org/10.11591/ijpeds.v1i1.64
Volume: 1
Issue: 1
Page: 75-82
Publish at: 2011-09-29
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