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27,404 Article Results

Opinion Sentiment Analysis

10.11591/ijaas.v5.i3.pp128-136
Alok Kumar , Renu Jain
An automatic system to analyze the opinions/feedbacks of the people working in any organization is proposed. The proposed system does two major jobs: the first part extracts the most relevant/important aspects from the textual feedbacks provided by clients/managers/co-workers for all the employees having similar job profile and the second part measures the degree of positivity or negativity for all the extracted aspects for every employee and then an overall performance of everyone is evaluated. We have implemented the system to study the feedback of teachers. The proposed system is flexible and versatile than the existing feedback evaluation system of teachers where students evaluate the teachers on the predefined aspects decided by experienced and senior teachers. Our system, Faculty Evaluation System (FES) identifies strengths and weaknesses of teachers on all aspects which are important to students. This information may be used by higher authorities of the institute in identifying suitable faculty members for different academic and administrative activities of the institute in addition to the teaching responsibility.
Volume: 5
Issue: 3
Page: 128-136
Publish at: 2016-09-01

Unified Power Quality Conditioner Model Based with Series and Shunt Filters

10.11591/ijpeds.v7.i3.pp743-758
khalaf Gaeid , Mounir T. Hamood
With the increase of the complexion in the power distribution system, it is very possible that several kinds of power quality disturbances are happened in a power distribution system simultaneously.This paper proposes a unified power quality conditioner (UPQC) including a series and a shunt active power filter (APF) to compensate harmonics in both the distorted supply voltage and nonlinear load current. In the series APF control scheme, a proportional-integral (PI) controller , meanwhile a PI controller and are designed in the shunt APF control scheme to relieve harmonic currents produced by nonlinear loads. The DC voltage is maintained constant using Two degree of freedom proportional integral voltage controller(2DoFPI). The performance of the proposed UPQC is significantly improved compared to the conventional control strategy. The feasibility of the proposed UPQC control scheme is validated through the simulations.
Volume: 7
Issue: 3
Page: 743-758
Publish at: 2016-09-01

Fuzzy Sliding Mode Control for Photovoltaic System

10.11591/ijpeds.v7.i3.pp964-973
Mounir Derri , Mostafa Bouzi , Ismail Lagrat , Youssef Baba
In this study, a fuzzy sliding mode control (FSMC) based maximum power point tracking strategy has been applied for photovoltaic (PV) system. The key idea of the proposed technique is to combine the performances of the fuzzy logic and the sliding mode control in order to improve the generated power for a given set of climatic conditions. Different from traditional sliding mode control, the developed FSMC integrates two parts. The first part uses a fuzzy logic controller with two inputs and 25 rules as an equivalent controller while the second part is designed for an online adjusting of the switching controller’s gain using a fuzzy tuner with one input and one output. Simulation results showed the effectiveness of the proposed approach achieving maximum power point. The fuzzy sliding mode (FSM) controller takes less time to track the maximum power point, reduced the oscillation around the operating point and also removed the chattering phenomena that could lead to decrease the efficiency of the photovoltaic system.
Volume: 7
Issue: 3
Page: 964-973
Publish at: 2016-09-01

IoT Based Wind/Solar Hybird Inverter

10.11591/ijaas.v5.i3.pp137-140
Ajeeth Kumar S. , Shabarish G. , Kishore Kannan A.
Paper deals with power control of a wind and solar hybrid generation system for connection operation with electric distribution system. Power control strategy is to extract the maximum energy available from varying condition of wind speed and solar irradiance while maintaining power quality at a safety level. In order to verify the maximum power variable speed control is come for wind turbine and maximum power is applied for PV system.  Inverter transfers the energy from the wind turbine and PV array into the grid by keeping common dc voltage constant. To ensure safety these inverters automatically shut down in the event of: High/Low AC-voltage; High/Low frequency; IOT is a key feature in which safety measurement is current and voltage.  The results show the control performance and  behavior of the wind/PV system .solar and wind are major possible ways were energy level are stored  in  battery, we implement to ensure that power transmission ways in hybrid pv/wind power are stored properly in batteries. Our aim is to monitor the current and voltage by means of IOT. The wave distribution of voltage and current is checked rapidly by using IOT. Non regular checking of voltage and current leads to total damage. And so we ensure that damage are monitored over IOT, variable power raise and drop are checked over by IOT. PV and wind  power.
Volume: 5
Issue: 3
Page: 137-140
Publish at: 2016-09-01

Design and Simulation of PFC Converter for Brushless SRM Drive

10.11591/ijpeds.v7.i3.pp625-637
M. Rama Subbamma , V. Madhusudhan , K.S.R Anjaneyulu
In most of the industrial applications, Switched Reluctance Motor (SRM) is mainly employed due to the reasons like having low maintenance and high efficiency. SRM consists of windings only on its stator, but would not have any windings on rotor thus having very simple construction. The available supply is AC. But AC cannot be directly supplied to SRM when used for air-conditioner application which is employed in this paper. Also power factor in the system needs to be corrected when using a SRM drive. Thus AC supply is fed to power factor correction (PFC) converter which is Buck-Boost converter here in this paper. The output of the PFC converter is fed to SRM through a simple asymmetrical converter. This PFC circuit consists of a simple diode bridge rectifier with Buck-Boost DC-DC converter. A suitable control circuit was proposed to control the input power factor under various loading conditions. This paper gives analysis of SRM drive for air-conditioner application with Buck-Boost converter based PFC circuit. A Matlab/simulink based model is developed and simulation results are presented. Simulation is carried out for different speed response.
Volume: 7
Issue: 3
Page: 625-637
Publish at: 2016-09-01

A Novel Power Factor Correction Modified Bridge Less-CUK Converter for LED Lamp Applications

10.11591/ijpeds.v7.i3.pp880-891
Saravanan D , Gopinath M
In recent decades, several research works have been focused on the efficient Power Factor Correction (PFC) converter design in to meet the power supply efficiency. Conventional PFC cuk converter widely uses the full bridge rectifier which had resulted in overall increase of converter losses and inefficiency. This paper is intended to develop a novel PFC Bridgeless cuk converter for LED lamp applications. In this work, the limitations of the conventional PFC Cuk converter are resolved. The major contributions of the proposed work include the minimization in the number of conduction devices and minimization of the power utility devices which in turn resulted in minimal losses and better efficiency. Moreover, the proposed converter works in DCM which requires only one voltage sensor which results in reduced cost. The proposed Modified BL Cuk converter (MBL-CUK) for LED lamp is simulated in MATLAB and the corresponding results show the better power quality indices such as power factor and Total Harmonic Distortion.
Volume: 7
Issue: 3
Page: 880-891
Publish at: 2016-09-01

Identification of the Inrush Current of the Internal Faults of Power Transformers Based on the Differential Relay Function

10.11591/ijaas.v5.i3.pp141-148
Majid Salimi
The inrush current of transformer is one of the most important factors in the damaging of power transformers and reducing their useful life. Differential relays are one of the main and primary protections of power transformers. Therefore, the correct and fast operation of these devices is so important. In this paper, an inrush flow detection method is proposed in order to prevent the inaccurate performance of differential relay. In the proposed method, the analysis of the wavelet transform frequency time is used based on the extracted characteristics. Also, a criterion called correlation coefficient is used in order to create a suitable pattern and use it in the proposed algorithm. The simulation of the proposed algorithm is performed by the PSCAD software and implemented in the MATLAB environment. The results of the simulation confirm the accuracy of the proposed method.
Volume: 5
Issue: 3
Page: 141-148
Publish at: 2016-09-01

Car Service Spare Parts Procurement Process Improvements Based on SOA

10.11591/ijeecs.v3.i3.pp554-563
Yue You , Yingcheng Xu , Li Wang
There are many kinds of automobile after-sale service spare parts, which are with a complex relationship in replacement and a large time span in models. The management of automobile after-sale service spare parts is a challenge, not only for automobile manufacturer but also for distributor. Therefore, it becomes an important and difficult task for automobile enterprises to do well in the supply of after-sale service spare parts, but also a target for automobile enterprises to explore and pursue continuously. Taking FAW-Volkswagen Automobile Co. Ltd. as the background, we conducted analysis on its procurement management process of spare parts; we also made some improvements on its process and pushed forward the corresponding products and solutions based on SOA (Service-oriented architecture) framework, so as to improve the procurement efficiency of automobile spare parts, and save cost.
Volume: 3
Issue: 3
Page: 554-563
Publish at: 2016-09-01

Reduction of Cogging Torque by Adapting Bifurcated Stator Slots and Minimization Of Harmonics And Torque Ripple in Brushless DC Motor

10.11591/ijpeds.v7.i3.pp781-789
M. Arun Noyal Doss , K. Mohanraj , V. Kalyanasundaram , K. Karthik
This paper proposes an improved methodology to minimize the cogging torque, harmonics and torque ripples in Brushless DC (BLDC) motor. The cogging torque is reduced by designing the BLDC motor with bifurcated active surface area using Finite Element Analysis (FEA). The harmonics and torque ripple is minimized using PI and Fuzzy controllers. These controllers are analyzed to bring out an optimal solution. The effectiveness and flexibility of the individual techniques of proposed control method is verified through simulations [Matlab Simulink]. The experimental result is shown only for fuzzy control because fuzzy is better comparing the performance of PI controllers.
Volume: 7
Issue: 3
Page: 781-789
Publish at: 2016-09-01

A Simple Three-term Conjugate Gradient Algorithm for Solving Symmetric Systems of Nonlinear Equations

10.11591/ijaas.v5.i3.pp118-127
M. Y. Waziri , L. Muhammad , J. Sabi’u
This paper presents a simple three-terms Conjugate Gradient algorithm for solving Large-Scale systems of nonlinear equations without computing Jacobian and gradient via the special structure of the underlying function. This three term CG of the proposed method has an advantage of solving relatively large-scale problems, with lower storage requirement compared to some existing methods. By incoporating the Powel restart approach in to the algorithm, we prove the global convergence of the proposed method with a derivative free line search under suitable assumtions. The numerical results are presented which show that the proposed method is promising.
Volume: 5
Issue: 3
Page: 118-127
Publish at: 2016-09-01

Optimum Software Aging Prediction and Rejuvenation Model for Virtualized Environment

10.11591/ijeecs.v3.i3.pp572-578
I M Umesh , G N Srinivasan
Advancement in electronics and hardware has resulted in multiple softwares running on the same hardware. The result is multiuser, multitasking and virtualized environments.  However, reliability of such high performance computing systems depends both on hardware and software.  For hardware, aging can be dealt with replacement. But, software aging needs to be dealt with software only. For aging detection, a new approach using machine learning framework has been proposed in this paper. For rejuvenation, Adaptive Genetic Algorithm (A-GA) has been developed to perform live migration to avoid downtime and SLA violation. The proposed A-GA based rejuvenation controller (A-GARC) has outperformed other heuristic techniques such as Ant Colony Optimization (ACO) and best fit decreasing (BFD) for migration. Results reveal that the proposed aging forecasting method and A-GA based rejuvenation outperforms other approaches to ensure optimal system availability, minimum task migration, performance degradation and SLA violation.
Volume: 3
Issue: 3
Page: 572-578
Publish at: 2016-09-01

IRAMY Inverter Control for Solar Electric Vehicle

10.11591/ijpeds.v7.i3.pp1012-1022
Rachid Taleb , Hemza Saidi
Solar Electric Vehicles (SEV) are considered the future vehicles to solve the issues of air pollution, global warming, and the rapid decreases of the petroleum resources facing the current transportation technology. However, SEV are still facing important technical obstacles to overcome. They include batteries energy storage capacity, charging times, efficiency of the solar panels and electrical propulsion systems. Solving any of those problems and electric vehicles will compete-complement the internal combustion engines vehicles. In the present work, we propose an electrical propulsion system based on three phase induction motor in order to obtain the desired speed and torque with less power loss. Because of the need to lightweight nature, small volume, low cost, less maintenance and high efficiency system, a three phase squirrel cage induction motor (IM) is selected in the electrical propulsion system. The IM is fed from three phase inverter operated by a constant V/F control method and Space Vector Pulse Width Modulation (SVPWM) algorithm. The proposed control strategy has been implemented on the texas instruments TM320F2812 Digital Signal Processor (DSP) to generate SVPWM signal needed to trigger the gates of IGBT based inverter. The inverter used in this work is a three phase inverter IRAMY20UP60B type. The experimental results show the ability of the proposed control strategy to generate a three-phase sine wave signal with desired frequency. The proposed control strategy is experimented on a locally manufactured EV prototype. The results show that the EV prototype can be propelled to speed up to 60km/h under different road conditions.
Volume: 7
Issue: 3
Page: 1012-1022
Publish at: 2016-09-01

Influence of Web Based Cooperative Learning Strategy and Achiever Motivation on Student Study Outcome

10.11591/ijere.v5i3.4538
Bambang Hariadi , Tutut Wurijanto
The research aimed at examining the effect of instructional strategy (web-based STAD and text-based STAD) and achiever motivation toward student learning outcomes. The research implied quasi-experimental design with nonequivalen control group factorial version. The subjects were undergraduated students of Information Systems of academic year 2014/2015 at STIKOM Surabaya. Two groups were involved in the investigation with which amounts to 67 students, comprised of 34 students for the experimental class and 33 students for grade control. The collected data were statistically processed using analysis of variance techniques (ANOVA) two paths using a significance level of 0,05. The results of this research indicate that there is a difference in outcome study of Organization Behavior courses is significant between groups of students who studied with a web-based STAD type cooperative instrutional strategies and textual STAD type cooperative strategies. Based on the findings of this research, researchers suggest implementing STAD tipe cooperative of instructional strategy, with simultaneously (complementary) between the web-based and text-based in the form of blended learning.
Volume: 5
Issue: 3
Page: 189-199
Publish at: 2016-09-01

Backstepping Control of Wind and Photovoltaic Hybrid Renewable Energy System

10.11591/ijpeds.v7.i3.pp677-687
Marouane El Azzaoui , Hassane Mahmoudi , Karima Boudaraia
This paper deals with the interconnected grid hybrid renewable energy system (HRES). The wind energy conversion system (WECS), is built around a wind turbine coupled to a doubly fed induction generator (DFIG). The stator of DFIG is directly related to the grid and the rotor is connected to the grid through back-to-back power converters. The proposed algorithm combines the nonlinear Backstepping approach and the eld orientation applied to control the DFIG. In a rst step, this technique is applied to the side converter rotor (RSC), to control the electromagnetic torque and reactive power, and secondly, it is applied to the grid side converter (GSC) to control the power exchanged with the grid and regulate the DC bus voltage. The PV energy system is composed by the PV array and the DC-DC boost converter which controlled by the MPPT method to extract the optimal power. Simulations results present the performances in terms of set point tracking, stability, and robustness with respect to the variation in wind speed and irradiation.
Volume: 7
Issue: 3
Page: 677-687
Publish at: 2016-09-01

A Novel Control Strategy of Indirect Matrix Converter Using Space Vector Modulation

10.11591/ijpeds.v7.i3.pp926-935
Kuldeep Behera , Subrat Behera
This paper introduces a control scheme of Indirect Matrix Converter which includes space vector modulation to stabilize the frequency variations. The terminal voltage and frequency of any synchronous machine can be controlled easily with this scheme. Further the control strategy is proposed and implemented in Matlab/Simulink Embedded system which gives significant better performance compared to conventional control technique like better Total Harmonic Distortion (THD), more output voltage with same Modulation Index, less switching stress and less switching loss. This method might prove effective for wind energy conversion system using DFIG as the DFIG speed is close to synchronous speed. The complete control strategy is verified using MATLAB/Simulink.
Volume: 7
Issue: 3
Page: 926-935
Publish at: 2016-09-01
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