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27,404 Article Results

On Usable Speech Detection by Linear Multi-Scale Decomposition for Speaker Identification

10.11591/ijece.v6i6.pp2766-2772
Wajdi Ghezaiel , Amel Ben Slimane , Ezzedine Ben Braiek
Usable speech is a novel concept of processing co-channel speech data. It is proposed to extract minimally corrupted speech that is considered useful for various speech processing systems. In this paper, we are interested for co-channel speaker identification (SID). We employ a new proposed usable speech extraction method based on the pitch information obtained from linear multi-scale decomposition by discrete wavelet transform. The idea is to retain the speech segments that have only one pitch detected and remove the others. Detected Usable speech was used as input for speaker identification system. The system is evaluated on co-channel speech and results show a significant improvement across various Target to Interferer Ratio (TIR) for speaker identification system.
Volume: 6
Issue: 6
Page: 2766-2772
Publish at: 2016-12-01

Advance Technology in Application of Four Leg Inverters to UPQC

10.11591/ijpeds.v7.i4.pp1153-1160
K. Venkata Rami Reddy , T. Gowri Manohar , B. Chandra Sekhar
This article presents a novel application of four leg inverter with conventional Sinusoidal Pulse Width Modulation (SPWM) Scheme to Unified Power Quality Conditioner (UPQC). The Power Quality problem became burning issues since the starting of high voltage AC transmission system. Hence, in this article it has been discussed to mitigate the PQ issues in high voltage AC systems through a three phase Unified Power Quality Conditioner (UPQC) under various conditions, such as harmonic mitigation scheme, non linear loads, sag and swell conditions as well. Also, it proposes to control harmoincs with various artificial intelligent techniques. Thus application of these control technique such as Artifical Neural Networks, Fuzzy Logic makes the system performance in par with the standards and also compared with existing system. The simulation results based on MATLAB/SIMULINKTM are discussed in detail to support the concept developed in the paper.
Volume: 7
Issue: 4
Page: 1153-1160
Publish at: 2016-12-01

Microruban Dipole Antenna for RFID Applications at 2.45 GHz

10.11591/ijece.v6i6.pp2891-2899
Loubna Berrich , Lahbib Zenkouar
Radio Frequency Identification (RFID) is a technology used mainly to identify tagged items or to track their locations. The most used antennas for RFID application are planar dipoles. For antenna design, it is necessary that the antenna has an impedance value equal to the conjugate of the impedance of the integrated circuit CI. To have a good adaptation allowing the maximum power transfer, there are several techniques. In this work we focus to the adaptation technical T-match which is based on the insertion of a second folded dipole in the center of the first dipole. This technique is modeled by an equivalent circuit to calculate the size of the folded dipole to have new input impedance of the antenna equal to the conjugate of the impedance of the IC. We also look to present a conceptual and technological approach of new topologies of linear dipoles. We proceeded to fold at right angles of the radiating strands in order to explore other topologiesof type  L and Z. The interest of this microstrip folded dipole is their effectiveness to achieve coverage of Blind directions. The results obtained by the platform Ansoft HFSS, allowed us to obtain a quasi-uniform radiation patterns and the reflection coefficients that exceed -37 dB.
Volume: 6
Issue: 6
Page: 2891-2899
Publish at: 2016-12-01

Modelling of Virtual Synchronous Converter for Grid-inverter Synchronization in Microgrids Applications

10.11591/ijpeds.v7.i4.pp1377-1385
Md. Ruhul Amin , Shamsul Aizam Zulkifli
In this paper, virtual synchronous converter (VSCon) is modelled which behaves as synchronous generator including its all real-time characteristics in operating inverter. This VSCon is used to synchronize grid and inverter while integrating distributed generated power to microgrids. The frequency and voltage synchronization can be controlled by using synchronous generator mathematical model is installed into the inverter. The whole unit of VSCon operated is simulated in Matlab/Simulink for observing all consequences for synchronizing voltage, frequency and phase-angle. It is verified that the next generation energy resources can be integrated into microgrid making synchronization grid-inverter using VSCon. The simulation results are given to verify the concept of modelling VSCon functioning inverter as a synchronous generator. 
Volume: 7
Issue: 4
Page: 1377-1385
Publish at: 2016-12-01

Single-phase Multilevel Inverter with Simpler Basic Unit Cells for Photovoltaic Power Generation

10.11591/ijpeds.v7.i4.pp1233-1239
M. S. Chye , J. A. Soo , Y. C. Tan , M. Aizuddin , S. Lee , M. Faddle , S. L. Ong , T. Sutikno , J. H. Leong
This paper presents a single-phase multilevel inverter (MLI) with simpler basic unit cells. The proposed MLI is able to operate in two modes, i.e. charge mode to charge the batteries, and inverter mode to supply AC power to load, and therefore, it is inherently suitable for photovoltaic (PV) power generation applications. The proposed MLI requires lower number of power MOSFETs and gate driver units, which will translate into higher cost saving and better system reliability. The power MOSFETs in the basic unit cells and H-bridge module are switched at near fundamental frequency, i.e. 100 Hz and 50 Hz, respectively, resulting in lower switching losses. For low total harmonic distortion (THD) operation, a deep scanning method is employed to calculate the switching angles of the MLI. The lowest THD obtained is 8.91% at modulation index of 0.82. The performance of the proposed MLI (9-level) has been simulated and evaluated experimentally. The simulation and experimental results are in good agreement and this confirms that the proposed MLI is able to produce an AC output voltage with low THD.
Volume: 7
Issue: 4
Page: 1233-1239
Publish at: 2016-12-01

Modeling and Simulation of Induction Motor based on Finite Element Analysis

10.11591/ijpeds.v7.i4.pp1100-1109
Yemna Bensalem , Mohamed Naceur Abdelkrim
This paper presents the development of a co-simulation platform of induction motor (IM). For the simulation, a coupled model is introduced which contains the control, the power electronics and also the induction machine. Each of these components is simulated in different software environments. So, this study provides an advanced modeling and simulation tools for IM which integrate all the components into one common simulation platform environment. In this work, the IM is created using Ansys-Maxwell based on Finite Element Analysis (FEA), whereas the power electronic converter is developed in Ansys-Simplorer and the control scheme is build in MATLAB-Simulink environment. Such structure can be useful for accurate design and allows coupling analysis for more realistic simulation. This platform is exploited to analyze the system models with faults caused by failures of different drive’s components. Here, two studies cases are presented: the first is the effects of a faulty device of the PWM inverter, and the second case is the influence of the short circuit of two stator phases. In order to study the performance of the control drive of the IM under fault conditions, a co-simulation of the global dynamic model has been proposed to analyze the IM behavior and control drives. In this work, the co-simulation has been performed; furthermore the simulation results of scalar control allowed verifying the precision of the proposed FEM platform.
Volume: 7
Issue: 4
Page: 1100-1109
Publish at: 2016-12-01

An Improved Constant Voltage Based MPPT Technique for PMDC Motor

10.11591/ijpeds.v7.i4.pp1330-1336
Mohammed Asim , Mohd Tariq , M.A. Mallick , Imtiaz Ashraf
Stand-alone photovoltaic (SAPV) systems are being used in remote areas and are being seen as one of the promising solution in this regard. The SAPV system as presented in the paper consists of solar PV panel, a DC-DC converter, a controller and a PMDC motor. The current-voltage and power-voltage characteristics being nonlinear, the SAPV system require maximum power point techniques (MPPT) control techniques to extract maximum power available from the PV cell. A voltage based MPPT technique which is capable of tracking MPP has been selected because of numerous advantages it offers such as: simple and low cost of implementation. The limitation of constant voltage method is that its efficiency is low as the PV panel has to be disconnected from the load for measurement of the open circuit voltage (Voc). In the presented paper, the authors have removed this limitation by using a pilot PV panel for measurement of Voc. A proportional-integrator (PI) based controller is used in implementation of constant voltage MPP technique and the modeling is done in MATLAB®/SIMULINK simulation environment. The simulation results are presented and discussed in the paper, the results shows that the efficiency of the system has increased.
Volume: 7
Issue: 4
Page: 1330-1336
Publish at: 2016-12-01

Model for Estimating Above Ground Biomass of Reclamation Forest using Unmanned Aerial Vehicles

10.11591/ijeecs.v4.i3.pp586-593
Sri Wahyuni , I Nengah Surati Jaya , Nining Puspaningsih
Among various stand parameters, the density of biomass volume is oftenly used as an indicator on evaluating the forest growth succes. The forest reclamation, which is intended to restore the land cover by revegetation process, the evaluation of biomass content has been a critical issue. Forest reclamation is expected to restore the land function to a proper state that might give better environment as well as productivity. In this study the authors develop a method for estimating above ground biomass (AGB), particularly in the ex open-pit coal mining area of PT. Bukit Asam Tbk using remotely-sended data taken from unmanned aerial vehicle (UAV) and developed using the least squares method. The main objective of this study is to develop a mathematical model of biomass estimation using UAV imagery having 10-cm spatial resolution. The study found that the best model of biomass estimation is: AGB(ton/ha)=0.2377Ci1.3688 with the correlation coefficient of 0.844, mean deviation of 2.29, aggregate deviation of -0.023, bias of 0.98, and Root Mean Square Error (RMSE) of 1.784 and mean deviation (MD) < 10% while Ci. This research concluded that UAV imagery could be used to estimate above ground biomass accurately.
Volume: 4
Issue: 3
Page: 586-593
Publish at: 2016-12-01

Convergence Evaluation of a Load Flow Method based on Cespedes' Approach to Distribution System Analysis

10.11591/ijece.v6i6.pp3276-3282
Diego Issicaba , Jorge Coelho
This paper evaluates the convergence of a load flow method based on Cespedes' formulation to distribution system steady-state analysis. The method is described and the closed-form of its convergence rate is deduced. Furthermore, convergence dependence of loading and the consequences of choosing particular initial estimates are verified mathematically. All mathematical results have been tested in numerical simulations, some of them presented in the paper.
Volume: 6
Issue: 6
Page: 3276-3282
Publish at: 2016-12-01

Human, the Electric Machine

10.11591/ijaas.v5.i4.pp149-156
Anurag Pandey
In modern time we are using lot of electronic devices but to run an electronic unit power generation is taking place. Major issue is it also generating problem of pollution. So, an effort has been made to harvest energy from human body for power supply. In this paper different method of energy harvesting from human body such as thermo electric power, power from heartbeat, angular knee and footsteps motion are briefly reviewed and showed that how principle of thermo electric power may be helpful to reduce abnormal level of β brain wave, caused due excessive stress and/or anxiety. An automation system can be used to control these generated power. This paper also presents a ladder logic algorithm to control for human generated power using PLC programming, with RS-232 DF1interface.
Volume: 5
Issue: 4
Page: 149-156
Publish at: 2016-12-01

Medical Documentation Practice of Health Professionals and Attitude towards it at University of Gondar Hospital, Gondar, North West Ethiopia

10.11591/ijaas.v5.i4.pp157-162
Adinew Belay , Y. Narasimha Rao
Medical documentation is believed as pertinent facts of medicalcare plan. It is a warehouse for patient’s information and interaction with theircaregivers in particular. However, there are lack of completeness, consistency,proper recoding and other constraints regarding the current medical recordpractice. The main objective of this study was to assess the current medicaldocumentation practice of health professionals and attitude towards it atUniversity of Gondar Hospital, Gondar, North West Ethiopia, 2016.Institution based cross sectional quantitative study was conductedfrom March 15 to April 30, 2016 at University of Gondar Hospital. About 260health professionals who work in different wards were participated. Data werecollected using structured self-administered questionnaires of professionals andreviewed their recorded medical documentation (chart). Logistic regressions;both bi-variable and multi-variable logistic regressions analyses models werefitted. The odds ratio with 95 % CI was computed and these variables which havea (p-value < 0.05) in the multi-variable logistic regression analysis model weretaken as statistically significant and interpreted accordingly. Good medical documentation practice by health professionals was 45.4% (n=118). Documentation for all patients using documentation standard toolswith AOR=1.799(95%CI [1.065, 3.040]), working area with AOR=2.522(95%CI[1.264, 5.033]), and favourable attitude towards medical documentation withadjusted OR=1.182(95% CI [1.039, 3.169]) were significantly associated withgood medical documentation practice.Medical documentation practice at University of Gondar Hospital was found low.Documentation using standard tools, working area (setting) and attitude ofprofessionals were important factors associated with medical documentationpractice. Organizational support needs to be strengthening, ensure procedure,format and documentation type (including documentation tools and forms); etcneeds emphasis to improve documentation practice.
Volume: 5
Issue: 4
Page: 157-162
Publish at: 2016-12-01

Analysis of Harmonics and Ripple Current in Multi-module Converters with Increasing Number of Modules for High Power Applications

10.11591/ijpeds.v7.i4.pp1402-1409
D. Venkatasubramanian , S. P. Natarajan
Controlled rectifiers are considered as the most important hardware part in the field of HVDC systems in transmission lines and can be used for a number of power electronics based system operation, control and utility applications. In this paper, a brief design of a 12-pulse, 24-pulse, 36-pulse and a 48-pulse converter connected to the grid is presented along with the harmonic and ripple current analysis with its comparison statistics and thus providing a justification for the suitable ones. The performance of the 12, 24, 36 and 48-pulse converters are compared for their effectiveness in both quantitatively as well as qualitatively. Further, comparison of the 48-pulse converter on its THD and current ripple which is connected towards the grid with simple pulse width modulation technique is also proposed. It combines all features of the low switching concepts and DC current re-injection techniques. Some basic topological explanation of the controlled rectifiers and simulation results using MATLAB are also presented in this paper in order to justify the harmonic analysis. The simulation results along with the quantitative results shows the effectiveness of the proposed scheme for the cancelation or the elimination of the harmonics result in maximum harmonic mitigation, for high power utility applications, the 48-pulse converter is most fitting to improve the conversion efficiency, low di/dt and dv/dtand active and reactive power controllability.
Volume: 7
Issue: 4
Page: 1402-1409
Publish at: 2016-12-01

Optimal Location of SVC using Particle Swarm Optimization and Voltage Stability Indexes

10.11591/ijece.v6i6.pp2581-2588
M.N. Dazahra , F. Elmariami , A. Belfqih , J. Boukherouaa
Flexible AC transmission system are widley used in power sytems to ensure voltage stability, in virtue of their high cost the choise of the best location in electrical network is essential. The porpose of this paper is to present a new method for finding the optimal location, size and number of Static Var Compensator in order to enhace the voltage stability of electrical network. The optimal solution has been found by using the evolutionary programming algorithm, particle swarm optimization, combined with voltage stability indexes used for the estimation of the voltage collapse in power systems.The proposed algorithm has been validated by application on both simulation network model IEEE 30-Buses under different load cases and the electric network model of Casablanca region in Morocco.The results of the application have been analysed and compared in each case in order to get the optimal number of Static Var Compensator to be used.
Volume: 6
Issue: 6
Page: 2581-2588
Publish at: 2016-12-01

Design of a Grid-connected Photovoltaic Inverter with Maximum Power Point Tracking using Perturb and Observe Technique

10.11591/ijpeds.v7.i4.pp1212-1220
M. Abdur Razzak , Wahida Taskin Bhuiyan , Nawrin Islam Natasha , A K M Muzahidul Islam , Muhamad Kamal Mohammed Amin
There is no easy way to convert Photovoltaic (PV) energy with high efficiency due to dynamic changes in solar irradiance and temperature. This paper illustrates a control strategy to design and implementation of Maximum Power Point Tracking (MPPT) in a photovoltaic system using Perturb and Observe (P&O) algorithm. The PSIM simulation results confirm proper functioning of the proposed MPPT sub-circuit to achieve a constant 48V DC output from fluctuating voltage of solar panel by varying duty cycle of the MOSFET in the 24V-48V boost converter. The filtered output waveform of the SPWM driven H-bridge inverter via the L-C low pass filter is found to be a pure sine-wave of 48V peak which is then stepped-up 312V peak (220V rms) by using a step up transformer. The frequency of output voltage is found to be 50Hz with a total harmonic distortion (THD) of 0.001 which is much lower than the IEEE 519 standard.
Volume: 7
Issue: 4
Page: 1212-1220
Publish at: 2016-12-01

Comparison of Mamdani-Type and Sugeno-Type Fuzzy Inference Systems for Transformer Tap Changing System

10.11591/ijaas.v5.i4.pp163-167
Charles R. Sarimuthu , Vigna K. Ramachandaramurthy , H. Mokhlis , K.R. Agileswari
Voltage control is considered one of the basic operational requirements of electrical power systems. The most popular voltage control equipment includes On-Load Tap Changer (OLTC) transformer controlled by Automatic Voltage Control (AVC) relay. Recent studies have shown that fuzzy inference systems (FIS) are applicable for transformer tap changing system. In this paper, FIS are developed for transformer tap changing system using Mamdani-type and Sugeno-type fuzzy models. The results of the two fuzzy inference systems (FIS) are compared. The basic difference between the Mamdani-type FIS and Sugeno-type FIS is included in this paper. It also shows which one is a more suitable choice of the two FIS for transformer tap changing system.
Volume: 5
Issue: 4
Page: 163-167
Publish at: 2016-12-01
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