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23,598 Article Results

Multiple Switching Patterns for SHEPWM Inverters Using Differential Evolution Algorithms

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4867
Ayong Hiendro
An investigation on multiple patterns for both odd and even number of switching angles in a three-phase selective harmonic elimination pulse width modulation (SHEPWM) inverter is presented. The switching patterns are examined and classified on the basis of the harmonic performance of the waveforms output from the inverter. Differential evolution algorithms are employed to calculate the optimum switching angles. Selected cases are verified experimentally by a digital signal processor-based hardware implementation. The experimental results show that all types of the patterns offer low harmonic distortions on the inverter output after filtering.  However, one type gives better harmonic performance is identified.DOI: http://dx.doi.org/10.11591/ijpeds.v1i2.101
Volume: 1
Issue: 2
Page: 94-103
Publish at: 2011-10-29

Creation of Digital Elevated Model using lunar images of Chandrayan – 1

https://ijece.iaescore.com/index.php/IJECE/article/view/37
Sannidhi K S , M. Z. Kurian
The present work discusses the technique and methodology of analysing and Terrain Mapping Camera (TMC) Images acquired during India’s first  Moon mission, Chandrayaan  – 1, launched on October, 2008  for generating Digital Elevated Model (DEM). The Terrain Mapping Camera (TMC) on India’s first satellite for lunar exploration, Chandrayaan-1, is intended for systematic topographic mapping of the entire lunar surface, including the far side and the polar regions. A high resolution imagery of the entire Moon will help detailed study of specific lunar regions of scientific interests and further our understanding of lunar evolution. The swath of the instrument is 20 km. The digital elevation model (DEM) is a computer representation of the moon’s surface. DEMs can be generated by traditional photogrammetry based on aerial photos if they are available and they are created very often more economically by the means of space images. A Digital Terrain Model (DEM) is a continuous representation of a ground surface landform that is commonly used to produce topographic maps. DEMs are created by integrating data obtained from a wide range of techniques including remote sensing and land surveying.DEM's are sampled arrays of elevation values representing ground positions at regularly spaced intervals. Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form.  The normal orientation of data is by columns and rows. In this project work a DEM is created for each of the lunar images retrieved from the space craft using Triangulated Irregular Network (TIN)Key Words : Chandrayaan-1, DEM, Swath, TMC, TINDOI:http://dx.doi.org/10.11591/ijece.v1i2.80
Volume: 1
Issue: 2
Page: 182-186
Publish at: 2011-10-29

Simulation and Implementation of Interleaved Boost DC-DC Converter for Fuel Cell Application

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4875
Ahmad Saudi Samosir , NFN Taufiq , Abdul Halim Mohd Yatim
This paper deals with a boost dc-dc converter for fuel cell application. In fuel cell electric vehicles application, a high power boost dc-dc converter is adopted to adjust the output voltage, current and power of fuel cell engine to meet the vehicle requirements. One of challenge in designing a boost converter for high power application is how to handle the high current at the input side. In this paper an interleaved boost dc-dc converter is proposed for current sharing on high power application. Moreover, this converter also reduces the fuel ripple current. Performance of the interleaved boost converter is tested through simulation and experimental results.Keywords: component; Interleaved Boost Converter; Fuel Cell Electric Vehicle; high power application.DOI: http://dx.doi.org/10.11591/ijpeds.v1i2.126
Volume: 1
Issue: 2
Page: 168-174
Publish at: 2011-10-29

Implementation of Scalar Control Technique in SVPWM Switched Three–Level Inverter Fed Induction Motor Using DSP Controller

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4866
Vinoth Kumar , S. Suresh Kumar , Kishore Reddy
The main objective of the paper is to control the speed of an induction machine with scalar control technique. The scalar control technique (V/F) is used because of simplicity of control algorithm implementation and the response is better and accurate with closed loop slip compensation. An IGBT based three level diode clamped inverter (DCI) topology has been used instead of conventional two level inverter in order to reduce the harmonic content and to increase the device capability to handle the double the voltage of its rating.DOI: http://dx.doi.org/10.11591/ijpeds.v1i2.98
Volume: 1
Issue: 2
Page: 83-93
Publish at: 2011-10-29

Optimum Generation Scheduling for Thermal Power Plants using Artificial Neural Network

https://ijece.iaescore.com/index.php/IJECE/article/view/31
Nagaraj Mudukpla Shadaksharappa
A simple method to optimize generation scheduling for thermal power plant using artificial neural network is presented. The optimal generation of generators is achieved considering operational and load constraints. The B- Coefficients are used to evaluate transmission loss in the system. The fuel cost of each unit in a plant is computed. The effectiveness of methodology is tested with six thermal power plants. A result of proposed method is compared with classical method. The artificial neural network method is quick. Hence, artificial neural network technique can be used in central load dispatch center.Keywords- Neural network, B-Coefficients, Fuel cost, Power loss, Real powerDOI:http://dx.doi.org/10.11591/ijece.v1i2.83
Volume: 1
Issue: 2
Page: 135-139
Publish at: 2011-10-29

Congestion Management in Hybrid Electricity Markets with FACTS Devices with Loadability Limits

https://ijece.iaescore.com/index.php/IJECE/article/view/5373
Ashwani Kumar Sharma
Congestion management (CM) is one of the most important challenging tasks of the Independent System Operator (ISO) in the deregulated environment. In this paper, generators’ rescheduling based CM approach to manage transmission line congestion considering loadability limit has been presented for hybrid based electricity market model. The main contribution of the paper is (i) to obtain secure transactions for hybrid market model, (ii) optimal rescheduling of generators with loadability limits taken into account with secure transactions, (iii) and impact of FACTS devices on transmission line congestion management. The ISO ensures secure bilateral transactions in a hybrid market model and CM is managed with minimum preferred schedule to obtain minimum congestion cost. The results have been obtained for IEEE 24 bus test system.  Keywords: Generator re-dispatch, congestion management, pool electricity market, bid function, loadability limit.DOI:http://dx.doi.org/10.11591/ijece.v2i1.114
Volume: 2
Issue: 1
Page: 75-89
Publish at: 2011-10-29

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
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