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28,451 Article Results

Finite State Predictive Current and Common Mode Voltage Control of a Seven-phase Voltage Source Inverter

10.11591/ijpeds.v6.i3.pp459-476
Atif Iqbal , Shaikh Moinoddine , Khaliqur Rahman
The paper elaborate finite set model based predictive current control of a seven-phase voltage source inverter. The current control is carried out considering a finite set of control actions. The space vector model of a seven-phase voltage source inverter (VSI) yields 27 = 128 space voltage vectors, with 126 active and two zero vectors. The control method described in this paper discard some switching states from the whole set and employs reduced number of switching states to track the commanded current. Three sets of space vectors are used for switching actuation, in one case only 15 vectors are used (14 active and one zero), in second case 29 vectors are used (28 active and one zero) and finally 43 vectors (42 active and one zero) are employed. Optimal algorithm is employed to find the vector which minimizes the chosen cost function. The effect of selecting the cost function, the number of space vectors and the sampling time is investigated and reported. The developed technique is tested for RL load using simulation and experimental approaches. 
Volume: 6
Issue: 3
Page: 459-476
Publish at: 2015-09-01

Simulation and dSPACE Based Implementation of Various PWM Strategies for A New H-Type FCMLI Topology

10.11591/ijpeds.v6.i3.pp615-624
Chinnapettai Ramalingam Balamurugan , S.P. Natarajan , T.S. Anandhi , B. Shanthi
Depending on the number of levels in output voltage, inverters can be divided into two categories: two level inverter and Multi Level Inverters (MLIs). An inverter topology for high voltage and high power applications that seems to be gaining interest is the MLI. In high power and high voltage applications, the two level inverters have some limitations in operating at high frequency mainly due to switching losses and constraints of device rating.In this paper, a three phase H + type FCMLI (Flying Capacitor MLI) using sinusoidal reference, third harmonic injection reference, 60 degree reference and stepped wave reference are initially developed using SIMULINK and then implemented in real time environment using dSPACE. In H-type FCMLI with R-load it is inferred that bipolar COPWM-C provides output with relatively low distortion for 60 degree reference and bipolar COPWM-C strategy is found to perform better since it provides relatively higher fundamental RMS output voltage for THI reference. The five level output voltages of the chosen MLIs obtained using the MATLAB and dSPACE based PWM (Pulse Width Modulation) strategies and the corresponding %THD (Total Harmonic Distortion), VRMS (fundamental), CF (Crest Factor) and FF (Form Factor) are presented and analyzed.
Volume: 6
Issue: 3
Page: 615-624
Publish at: 2015-09-01

Performance and Analysis of Automatic Detection Of Ground-Glass Pattern in Lung Disease using High-Resolution Computed Tomography

10.11591/ijaas.v4.i3.pp95-102
M. Anto Bennet , G. Sankar Babu , S. Mekala , S. Natarjan , N. Srinivasan
This study proposes an approach for automatic detection of Ground glass pattern, a lung disease, from Computed Tomography (CT) and High Resolution Computed Tomography (HRCT) scans of the lung. The algorithm is based on frequency spectrum analysis of image using Gabor filter bank. Gabor filter banks are used to support the frequency extraction process. These algorithms when applied to HRCT images will assist doctors to gain more information than from the CT images. The tasks are completed in three steps: Preliminary mask formation, Peripheral mask formation and finally post processing. By these, higher sensitivity and selectivity may be achieved with fast processing time. In the post processing, binary noise removal technique is used to remove noise from the detection mask.
Volume: 4
Issue: 3
Page: 95-102
Publish at: 2015-09-01

LabVIEW Interface for Controlling a Test Bench for Photovoltaic Modules and Extraction of Various Parameters

10.11591/ijpeds.v6.i3.pp498-508
Abderrezak Guenounou , Ali Malek , Michel Aillerie , Achour Mahrane
Numerical simulation using mathematical models that take into account physical phenomena governing the operation of solar cells is a powerful tool to predict the energy production of photovoltaic modules prior to installation in a given site. These models require some parameters that manufacturers do not generally give. In addition, the availability of a tool for the control and the monitoring of performances of PV modules is of great importance for researchers, manufacturers and distributors of PV solutions. In this paper, a test and characterization protocol of PV modules is presented. It consists of an outdoor computer controlled test bench using a LabVIEW graphical interface. In addition to the measuring of the IV characteristics, it provides all the parameters of PV modules with the possibility to display and print a detailed report for each test. After the presentation of the test bench and the developed graphical interface, the obtained results based on an experimental example are presented.
Volume: 6
Issue: 3
Page: 498-508
Publish at: 2015-09-01

Image Mosaicing Technique for Wide Angle Panorama

10.11591/ijeecs.v15.i3.pp420-429
G. Divya , Ch. Chandrasekhar
Images are integral part in our daily lives. With a normal camera it is not possible to get a wide angle panorama with high resolution. Image Mosaicing is one of the novel techniques, for combining two or more images of the same scene taken in different views into one image. In the dark areas, the obtained image is a panoramic image with high resolution without mask. But in the case of lighting areas, the resultant image is generating mask. In order to gets wide angle panorama, in the existing system, extracting feature points, finding the best stitching line, Cluster Analysis (CA) and Dynamic Programming (DP) methods are used. Also used Weighted Average (WA) method for smooth stitching results and also eliminate intensity seam effectively. In the proposed system, to get feature extraction and feature matching SIFT (Scaled Invariant Feature Transform) algorithm used. In this process, outliers can be generated. RANSAC (Random Sample Consensus) is used for detecting the outliers from the resultant image. Masking is significantly reduced by using Algebraic Reconstruction Techniques (ART).
Volume: 15
Issue: 3
Page: 420-429
Publish at: 2015-09-01

Resistivity Studies On Mn Site Substituted LCMSO Manganites

10.11591/ijaas.v4.i3.pp90-94
Bharat R. Kataria , Chirag Savaliya , J. H. Markna
Effect of Mn-site disorder in La0.67Ca0.33Mn1-xSbxO3 (LCMSO) created by the substitution of Sb5+ at Mn-site is studied through X-ray diffraction (XRD) and temperature dependent resistivity measurements to identify the role of size mismatch at Mn-site and their resistivity property correlations. XRD patterns collected at room temperature for all the LCMSO samples reveal single phasic nature without any detectable impurities within the measurement range studied. XRD data shows that all the samples possess orthorhombic structure without any structural phase transition. Variation in resistivity with Sb5+ content has been discussed in detail in the context of modifications in the structural and magnetic lattices and structural disorder.
Volume: 4
Issue: 3
Page: 90-94
Publish at: 2015-09-01

Droop Characteristics of Doubly Fed Induction Generator Energy Storage Systems within Micro Grids

10.11591/ijpeds.v6.i3.pp429-432
K.L. Sireesha , G. Kesava Rao
This article presents the operation of DFIG Doubly fed induction generator and a component energy storage (ES) within micro grids (MG). The aim of this proposal is to control voltage and frequency of wind farm micro grid shared by the Doubly fed induction generator (DFIG) through droop characteristics. This paper is mainly concerned with the operation of islanded micro grids. The proposed control methods are pretend by using Matlab/simulink.
Volume: 6
Issue: 3
Page: 429-432
Publish at: 2015-09-01

Design of A New Three Phase Hybrid H-bridge and H-Type FCMLI for Various PWM Strategies

10.11591/ijaas.v4.i3.pp82-89
Chinnapettai Ramalingam Balamurugan , S.P. Natarajan , V. Padmathilagam , T.S. Anandhi
The inverters have to be designed to obtain a quality output voltage or a current waveform with a minimum amount of ripple content. In high power and high voltage applications the conventional two level inverters, however, have some limitations in operating at high frequency mainly due to switching losses and constraints of the power device ratings. Series and parallel combination of power switches in order to achieve the power handling voltages and currents. The conventional two level inverters produce THD levels around 60% even under normal operating conditions which are undesirable and cause more losses and other power quality problems too on the AC drives and utilities. Nowadays, multilevel inverters are widely used in power industry. Voltage unbalance problem is one of the major issues in working of multilevel inverter. In this paper, a three phase H-bridge + H-type FCMLI using sinusoidal reference, third harmonic injection reference, 60 degree reference and stepped wave reference are initially developed using SIMULINK and then implemented in real time environment using dSPACE. The five level output voltages of the chosen MLIs obtained using the MATLAB and dSPACE based PWM strategies and the corresponding % THD, VRMS (fundamental) , CF and FF are presented and analyzed. It is observed that bipolar COPWM-C provides output with relatively low distortion for sine reference and bipolar COPWM-B strategy is found to perform better since it provides relatively higher fundamental RMS output voltage for 60 degree reference.
Volume: 4
Issue: 3
Page: 82-89
Publish at: 2015-09-01

Song Recommendation System Using Maximal b-Matching

10.11591/ijaas.v4.i3.pp109-116
Deepa S , Varsha R , Parvathi R
The last decade has witnessed a fundamental paradigm shift on how information content is distributed among people. Nowadays, an increasing number of platforms allow everyone to participate both in information production and information consumption. The phenomenon has been coined as democratization of content. However, as the opportunities to find relevant information and relevant audience increases, so does the complexity of a system that would allow suppliers and consumers to meet in the most efficient way. Our motivation is building a “featured item” component for social-media applications. Such a component would provide recommendations to consumers each time they login the system. The existing system follows either collaborative filtering or content based filtering. Collaborative filtering methods are based on collecting and analyzing a large amount of information on user’s behaviours, activities or preferences and predicting what users will like based on their similarity to other users. Content-based filtering methods are based on a description of the item and a profile of the user's preference. Both of these methods require input from the user in the form of ratings or other user's likes. But social content matching takes into account only the user's preferences and also the capacity constraints. For each item 't' and each user 'u', consider constraints on the maximum number of edges that t and u can participate in the matching. These capacity constraints can be estimated by the activity of each user and the relative frequency with which items need to be delivered. Here we introduce the concept called b-matching goal is to find a matching that satisfies all capacity constraints and maximizes the total weight of the edges in the matching. The result of b-matching is the set of songs that are to be recommended to the user based on his likes.
Volume: 4
Issue: 3
Page: 109-116
Publish at: 2015-09-01

Assessment of BIM Implementation among MEP Firms in Nigeria

10.11591/ijaas.v4.i3.pp73-81
Chen Wang , Shittu Hammed Adetola , Hamzah Abdul-Rahman
The purpose of this study is to assess the awareness level and potential challenges for Building Information Modelling (BIM) adoption among the Mechanical, Electrical and Plumbing (MEP) design consultants and contractors in Nigeria, and to get the perspective of BIM in the industry. The research method used in this study was a fieldwork survey using structured questionnaires. The results from the responses were analysed using descriptive statistics, one-way ANOVA test for statistical significant difference, Chi-Square test, and Cross Tab analysis. The findings from the survey show that Nigeria MEP firms have a relatively high level of awareness toward BIM technology. The Most important challenges identified as barriers for BIM adoption are lack of technical expertise on BIM tools utilisation, lack of awareness of BIM technology, and high investment cost in training staff, process change, and software/hardware upgrade.
Volume: 4
Issue: 3
Page: 73-81
Publish at: 2015-09-01

Modeling and Simulation of Closed Loop Controlled Parallel Cascaded Buck Boost Converter Inverter Based Solar System

10.11591/ijpeds.v6.i3.pp648-656
T. Sundar , S. Sankar
This Work deals with design, modeling and simulation of parallel cascaded buck boost converter inverter based closed loop controlled solar system. Two buck boost converters are cascaded in parallel to reduce the ripple in DC output. The DC from the solar cell is stepped up using boost converter. The output of the boost converter is converted to 50Hz AC using single phase full bridge inverter. The simulation results of open loop and closed loop systems are compared. This paper has presented a simulink model for closed loop controlled solar system.  Parallel cascaded buck boost converter is proposed for solar system.
Volume: 6
Issue: 3
Page: 648-656
Publish at: 2015-09-01

Novel Design of Reversible MUX and DEMUX using GDI Techinque

10.11591/ijaas.v4.i3.pp103-108
Majety Naveenkumar
Now a day’s Reversible logic is playing a crucial role in designing of digital circuits and it is used in reducing power consumption in digital design. By regaining the bit loss it reduces the power consumption in digital circuits. Gate diffusion input (GDI) is a technique of low-power digital circuit design. This technique reduces the power consumption, delay, and transistor count by maintaining the complexity very low of logic design. In these paper a novel MUX and DEMUX has been presented, which can be extended up to 1:2n and 2n:1 respectively  and these are developed by using only one type of Reversible gate i.e. Fredkin Gate (FRG) and Not Gate. The simulations are done in H-Spice using 90nm technology.
Volume: 4
Issue: 3
Page: 103-108
Publish at: 2015-09-01

Modeling and Control Analysis of Wind Turbine of Two Bladed and Three Bladed Wind Turbine Systems

10.11591/ijeecs.v15.i3.pp478-485
L V Suresh Kumar , Chintu Jaganmohanarao , Sai Lakshmi B
The wind power industry is currently the fastest growing renewable energy sector throughout the world. the aim of this paper is to implement the mathematical model and simulations torque control of two bladed and three bladed wind turbine systems by changing power coefficient, tip speed ratio and pitch angle values for different wind speeds.To ensure an economically competitive wind power production, the trend is to increase the turbine size while at the same time minimize material usage. In this paper we have two cases are developed one for two bladed and another for the three bladed wind turbines and compare the simulation results of both cases. The two balade and three blade systems are mathmatically developed and implemented in matlab simulink.
Volume: 15
Issue: 3
Page: 478-485
Publish at: 2015-09-01

A Review of the DTC Controller and Estimation of Stator Resistance in IM Drives

10.11591/ijpeds.v6.i3.pp554-566
Naveen Goel , Ram Narayan Patel , Saji Chacko
In recent years an advanced control method called direct torque control (DTC) has gained importance due to its capability to produce fast torque control of induction motor. Although in these systems such variables as torque, flux modulus and flux sector are required, resulting DTC structure is particularly simplistic. Conventional DTC does not require any mechanical sensor or current regulator and coordinate transformation is not present, thus reducing the complexity. Fast and good dynamic performances and robustness has made DTC popular and is now used widely in all industrial applications. Despite these advantages it has some disadvantages such as high torque ripple and slow transient response to step changes during start up. Torque ripple in DTC is because of hysteresis controller for stator flux linkage and torque. The ripples can be reduced if the errors of the torque and the flux linkage and the angular region of the flux linkage are subdivided into several smaller subsections. Since the errors are divided into smaller sections different voltage vector is selected for small difference in error, thus a more accurate voltage vector is selected and hence the torque and flux linkage errors are reduced. The stator resistance changes due to change in temperature during the operation of machine. At high speeds, the stator resistance drop is small and can be neglected. At low speeds, this drop becomes dominant. Any change in stator resistance gives wrong estimation of stator flux and consequently of the torque and flux. Therefore, it is necessary to estimate the stator resistance correctly. This paper aims to review some of the control techniques of DTC drives and stator resistance estimation methods.
Volume: 6
Issue: 3
Page: 554-566
Publish at: 2015-09-01

Perspective of Lecturers in Implementing PISMP Science Curriculum in Malaysia’s IPG

10.11591/ijere.v4i3.4503
Fauziah Hj Yahya , Abdul Rahim Bin Hamdan , Hafsah Binti Jantan , Halimatussadiah Binti Saleh
The article aims to identify lecturers’ perspectives in implementing PISMP science curriculum in IPG Malaysia based on teaching experience with KIPP model. The respondents consisted of 105 lecturers from 20 IPG Malaysia. The study used a questionnaire consisting of 74 items covering the four dimensions (Context, Input, Process and Product). Data collected through questionnaires were analyzed using one-way ANOVA. The study found that there was not a significant difference of curriculum goals and course objectives based on teaching experience at school. For input dimension, there was no significant difference of evaluation, content, source and pedagogy based on school teaching experience. In process dimension, there was no significant difference pedagogical process, the content and the process of assessment based on teaching experience at school. Furthermore, there was no significant difference of product dimension of science curriculum based on teaching experience at school. Based on the experience of teaching in IPG, lecturers did not have a significant difference of curriculum goals, course objectives, evaluation input, content, source, pedagogy, and evaluation process, and content process, but there were significant differences in the pedagogical input and product in the implementation of the PISMP science curriculum in IPG. Its discussions and recommendation were also discussed in this article.
Volume: 4
Issue: 3
Page: 130-137
Publish at: 2015-09-01
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