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29,734 Article Results

Speed and position estimator of for sensorless PMSM drives using adaptive controller

10.11591/ijpeds.v10.i1.pp128-136
Jurifa Mat Lazi , Zulkifilie Ibrahim , MHN Talib , Azrita Alias , Ainain Nur , Maaspaliza Azri
Nowadays, the elimination of the speed sensor in Permanent Magnet Synchronous Machine (PMSM) is greatly recommended to increase efficiency and reduce the cost of the drives. This paper proposes a simple estimator for speed and rotor position of PMSM drives using adaptive controller. The novelties of the proposed method are the simple estimator equations and the absence of the voltage probe which depend on direct and quadrature reference current only. The simplified mathematical model of the PMSM is formulated by using V-I model, based on adaptive control. Then, the speed estimation error of the voltage and current model based are analyzed. Thus, an adaptation mechanism model is established to cancel the error of the measured and estimated d-q currents. Since the output of the estimator is the position feedback, the performances of speed responses are presented. The hardware implementation of proposed sensorless drives is realized via dSPACE DS11103 panel. dSPACE Real Time Implementation (RTI) is the linkage between software and hardware set-up. It automatically processes the MATLAB Simulink model into dSPACE DS11103 processor. The experimental-hardware results demonstrate that the speed and position estimator of the proposed method is able to control the PMSM drives for forward and reverse of speed command, acceleration, deceleration and robustness to load disturbance.
Volume: 10
Issue: 1
Page: 128-136
Publish at: 2019-03-01

Pre-service teachers’ inclusion of climate change education

10.11591/ijere.v8i1.16923
Ronnel Joseph Tracena Competente
Findings from the study of pre-service teachers’ (PSTs) attitudes to climate change education, knowledge of climate change and potential inclusion in their future teachings are reported in this paper. Using adopted and self-made questionnaire, a sample of 180 pre-service teachers participated in a survey study in the College of Education, University of Nueva Caceres, divided into freshmen and senior year to examine developments in their attitudes to environmental education and their knowledge of climate change. Results showed that their attitudes towards climate change education were low and their climate change science knowledge had not changed. Data on preservice teachers’ sources of information for climate change, their views on essential climate change topics for their future students and their perceptions of gaps in their own training in relation to climate change education were also examined in order to substantiate the survey data. Results show that there is a need to triangulate climate change education not only in the program outcomes but also to the student and faculty development programs. Further results are discussed in this paper.
Volume: 8
Issue: 1
Page: 119-126
Publish at: 2019-03-01

DC transformer modeling and control of DC-DC buck converter

10.11591/ijpeds.v10.i1.pp319-329
Sarun Soman , Nishtha Shelly , Ciji Pearl Kurian , Sudheer Kumar TS
Switching Power Converters convert one form of power to another with high ef-ciency and accurate control.One of the most widely used DC-DC Converter is Buck Converter. Control is invariably required to maintain the output voltage/current in spite of variations in source/load. In order to design the controller and gain insight about the system a dynamic model needs to be developed. Modeling techniques widely used are state space averaging and PWM switch model. In this paper DC transformer modeling technique is used to develop the averaged model of the converter. One of the advantages of this model is that it can be implemented in Spice simulator using basic circuit elements. The same model can be used for time domain as well as frequency domain analysis. Analog type-II compensator is designed to compensate the system. Simulation and experimental results for start-up transient and load transient are shown to validate the model.
Volume: 10
Issue: 1
Page: 319-329
Publish at: 2019-03-01

A modeling and performance of the triple field plate HEMT

10.11591/ijpeds.v10.i1.pp398-405
Kourdi Zakarya , Abdelkhader Hamdoun
We present this work by two steps. In the first one, the new structure proposed of the FP-HEMTs device (Field plate High Electron Mobility Transistor) with a T-gate on an 4H-SIC substrate to optimize these electrical performances, multiple field-plates were used with aluminum oxide to split the single electric field peak into several smaller peaks, and as passivation works to reduce scaling leakage current. In the next, we include a modeling of a simulation in the Tcad-Silvaco Software for realizing the study of the influence of negative voltage applied to gate T-shaped in OFF state time and high power with ambient temperature, the performance differences between the 3FP and the SFP devices are discussed in detail.
Volume: 10
Issue: 1
Page: 398-405
Publish at: 2019-03-01

Occupational anxiety and self-efficacy levels among prospective teachers

10.11591/ijere.v8i1.18213
Şule Fırat Durdukoca , Tazegül Demir Atalay
This study examined the relationship between occupational anxiety and self-efficacy levels of prospective teachers enrolled in pedagogical formation training certificate program at the faculty of education in universities under the Council of Higher Education to teach in secondary schools and high schools in Turkey, and evaluated them based on diverse variables (gender, department, high school type, educational level of parents). It was a descriptive study using survey model. The study group comprised 236 prospective teachers. Research data were gathered through “Teaching Occupation Anxiety Scale” and “Teachers’ Sense of Efficacy Scale”. The study concluded that the prospective teachers’ anxiety about the teaching profession was low, whereas they had high occupational self-efficacy, and there was a moderate, negative relationship between the two variables. The study also found that occupational self-efficacy levels of the participants differed in relation to the educational level of father.
Volume: 8
Issue: 1
Page: 173-180
Publish at: 2019-03-01

Energy conservation project funding in commercial building: an expenditure or investment?

10.11591/ijpeds.v10.i1.pp504-513
Shaikh Shamser Ali , Ruchi Tyagi , Ragini Chauhan
Energy conservation is an unnecessary expenditure and considered as a less important operational activity in many third world countries, particularly in India. The review of literature on the energy conservation project funding identifies that unclear management vision and policy for energy conservation is one of the reason for its back seat. Energy Conservation is supposed to be a top-down approach, in reality, a procurement manager is obliged to buy based on L1 policy (Lowest quoted price). Most of the Energy Conservation Measures (ECM) are not available at lowest quoted price. Therefore, Energy Conservation Measures (ECM) turn out to be a document formality rather than practice.  The paper highlights the need for a paradigm shift on Energy conservation project from an expenditure to an investment. The Energy Conservation Project is an investment that will continue to give a return as long as the equipment is in operation or the facility is functional. This calls for amendments in Energy Policies and Project Guidelines for swift that there are no conflicts between the departments for implementing the energy conservation projects. 
Volume: 10
Issue: 1
Page: 504-513
Publish at: 2019-03-01

Adaptive fuzzy sliding mode based MPPT controller for a photovoltaic water pumping system

10.11591/ijpeds.v10.i1.pp414-422
Sabah Miqoi , Abdelghani El Ougli , Belkassem Tidhaf
The applications of photovoltaic energy are steadily increasing. However, the output power of a photovoltaic system is influenced by the meteorological conditions (temperature and irradiation), which can affect the production and efficiency of the photovoltaic panel energy. So to ensure that the photovoltaic panel produces its maximum power possible at any time and regardless of the external conditions, we use the equipment called MPPT (maximum power point tracker). Sliding mode control is recognized by its stability and robustness and widely used in non-linear systems but represents a disadvantage because of the chattering phenomena. So in order to overcome this problem and improve this control, we opted to add to it the adaptive fuzzy control which will adapt the switching gain. This controller is named AFSMC (adaptive fuzzy sliding mode control) and will be compared the sliding mode controller SMC in order to see the difference and to the P&O (perturb & observe) method to validate this controller. Our system consists of a photovoltaic panel a DC-DC boost converter and a centrifugal pump with a DC motor. All simulations are carried out under MATLAB/SIMULINK and the extracted results show the efficiency of the AFSMC controller and confirm that the new methods have improved energy efficiency and production
Volume: 10
Issue: 1
Page: 414-422
Publish at: 2019-03-01

Comparison of the different controlling techniques for buck converter in LED application

10.11591/ijpeds.v10.i1.pp256-264
Shwetha DV , Lakshman Rao S. Paragond
This paper recounts the design and construction of various controlling techniques for buck converter. If the designed controller for any converter is not proper which leads to high overshoot and steady state error, and its dynamic response varies with changes in load, especially at high load current conditions. The lead-lag controller for the converter  is desgined using classical control theory ,Bode Plot technique is used to examine the stability of the system.By using deravetive part of the PID controller on output signal instead of voltage error signal,this combination of control technique reduces the overshoot and settling time,and how the transient response will be affected if deravetive controller is in the forward path.
Volume: 10
Issue: 1
Page: 256-264
Publish at: 2019-03-01

Performance evaluation of a hybrid fuzzy logic controller based on genetic algorithm for three phase induction motor drive

10.11591/ijpeds.v10.i1.pp117-127
Ahmed Jadaan Ali , Ziyad Farej , Nashwan Sultan
It is known that controlling the speed of a three phase Induction Motor (IM) under different operating conditions is an important task and this can be accomplished through the process of controlling the applied voltage on its stator circuit. Conventional Proportional- Integral- Differeantional (PID) controller takes long time in selecting the error signal gain values. In this paper a hybrid Fuzzy Logic Controller (FLC) with Genetic Algorithm (GA) is proposed to reduce the selected time for the optimized error signal gain values and as a result inhances the controller and system performance. The proposed controller FL with GA is designed, modeled and simulated using MATLAB/ software under different load torque motor operating condition. The simulation result shows that the closed loop system performance efficiency under the controller has a maximum value of 95.92%. In terms of efficiency and at reference speed signal of 146.53 rad/sec, this system performance shows an inhancement of 0.67%,0.49% and 0.05% with respect to the closed loop system efficiency performance of the PID, FL, and PID with GA controllers respectively. Also the simulation result of the well designed and efficient GA in speeding up the process of selecting the gain values, makes the system to have an efficiency improvement of 14.42% with respect to the open loop system performance.
Volume: 10
Issue: 1
Page: 117-127
Publish at: 2019-03-01

Car following and lane changing behavior using NGSIM and China data

10.11591/ijaas.v8.i1.pp14-25
Md Mijanoor Rahman , Mohd. Tahir Ismail , Majid Majahar Ali
Road safety is imperative theme because increasing road fatalities deaths in world. Besides road fatalities, traffic jam is increasing, human is frustrated for uncomfortable journey. The roads safety and passengers comfortable of the roadway system are vastly depended on the Car following (CF) and Lane Changing (LC) features of drivers. CF and LC theory describe the driver behavior by following paths in a traffic stream. In this research, researchers have compared to US-101 Next-Generation-Simulation (NGSIM) data with Beijing forth ring road, China freeways real trajectory data by CF and LC models. The CF data has been calibrated with Genetic Algorithm (GA). Reproducing Kernel Hilbert Space (RKHS) is generated the LC beginning and finishing points. Findings revealed that the CF parameters as maximum acceleration, minimum deceleration, free speed, minimum headway and stopping distance percentages of Chinese data are 74.71%, 79.95%, 66.57%, 0.018% and 65.65% respectively of NGSIM data. After completing the comparison, researchers have been found out optimization safety and comfortable acceleration-deceleration and LC beginning-finishing points of driver behavior. Here this analysis generates the driver behavior at real traffic network on the express highways of specific two roads US-101 (NGSIM) data and Chinese freeways data. Since NGSIM data is well simulated so road traffic is more safety and comfortable for journey.
Volume: 8
Issue: 1
Page: 14-25
Publish at: 2019-03-01

System protection for lithium-ion batteries management system: a review

10.11591/ijeecs.v13.i3.pp1184-1190
L. Rimon , Khairul Safuan Muhammad , S.I. Sulaiman , AM Omar
Robustness of a battery management system (BMS) is a crucial issue especially in critical application such as medical or military. Failure of BMS will lead to more serious safety issues such as overheating, overcharging, over discharging, cell unbalance or even fire and explosion. BMS consists of plenty sensitive electronic components and connected directly to battery cell terminal. Consequently, BMS exposed to high voltage potential across the BMS terminal if a faulty cell occurs in a pack of Li-ion battery. Thus, many protection techniques have been proposed since last three decades to protect the BMS from fault such as open cell voltage fault, faulty cell, internal short circuit etc. This paper presents a review of a BMS focuses on the protection technique proposed by previous researcher. The comparison has been carried out based on circuit topology and fault detection technique
Volume: 13
Issue: 3
Page: 1184-1190
Publish at: 2019-03-01

Performance evaluation of standalone double axis solar tracking system with ‎maximum light detection MLD for telecommunication towers in Malaysia

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/14327
Ahmed Mohamed Abdulmula , Kamaruzzaman Sopian , Lim Chin Haw , Ahmad Fazlizan
This paper is performed to investigate the performance of ‎dual-axis solar tracking system with maximum light detection for off-grid telecommunication towers under weather conditions in Malaysia. The studied system consists of High-efficiency heterojunction intrinsic thin (HIT) film solar modules ‎coupled with state-of-the-art dual-axis maximum light detection (MLD) solar ‎tracking system. The ‎investigation method is based on the analyzed the daily actual data record for both the average power output of ‎the photovoltaic system and the ‎state of charge of batteries in four months ‎under different weather conditions as a function of time. Based on the results obtained ‎the use of HIT solar modules with MLD dual ‎axis solar tracking system has high performance effective under ‎Malaysian weather.‎ The study also presented the detailed investigated system description.
Volume: 10
Issue: 1
Page: 444-453
Publish at: 2019-03-01

Design PV system for a small GEO satellite and studying the effect of using different types of propulsion

10.11591/ijaas.v8.i1.pp54-63
A. Lotfy , W. Anis , Joseph V. M. Halim
This paper presents an optimum design of the solar Photo-Voltaic (PV) power system for small Geostationary Earth Orbit (GEO) satellites using triple junction solar cells and advanced Lithium Ion batteries. The paper applies the proposed system on various propulsion technologies; full chemical, full electrical and hybrid propulsions. This research work studies the capability to fulfil efficiently all the satellite power requirements during both the launching and the on-station phases while reducing the high cost challenge. Since the propulsion type is a key factor for the satellite cost, an economic analysis is demonstrated and investigated in two different strategies. The first scenario fixes the satellite weight and offers the revenue due to the increase in the satellite payload. However, the second scenario evaluates the saving profits due to the reduction in the satellite weight using the same number of satellite transponders. The analytical comparison among the different propulsion techniques shows the superior advantages of using the full electrical satellites.   
Volume: 8
Issue: 1
Page: 54-63
Publish at: 2019-03-01

Transient and steady-state analysis of single switched capacitor converter

10.11591/ijpeds.v10.i1.pp342-350
Alexander Kushnerov
The paper derives closed form expressions for transient and steady-state operation of a DC-DC converter with single switched capacitor. To this end, the result of each switching is considered as a point in the iterative process, and the function between the points is reconstructed. As opposed to the commonly accepted approach, when each of the topologies is approximated by a first order circuit, the proposed analysis is carried out for second order circuits. This allows obtaining the waveform of output voltage ripple and paves the way to more accurate calculation of equivalent resistance. The obtained analytical expressions were verified by simulations and an excellent agreement between the results was found.
Volume: 10
Issue: 1
Page: 342-350
Publish at: 2019-03-01

Machining time and number of machine for the production planning of wheel nut releaser with the demand of 100 units/day

10.11591/ijaas.v8.i1.pp8-13
Nanang Qosim , Mohammad Hartono
The impact of competition in the industry has driven people to improve the effectiveness of production process. One of the main factors supporting that effectiveness is the good planning of both the need and the number of machines. The aim of this study is to estimate the machining times to determine the number of machines to manufacture 100/day of the nut releaser tool for car wheel. The result shows that the need of the number of machines to manufacture each component of the nut releaser tool for car wheel are 7 units of power hacksaw, 27 units of lathe machine, 8 units of drilling machine, 12 units of milling machine, 2 units of EDM machine and 25 units of bench work.
Volume: 8
Issue: 1
Page: 8-13
Publish at: 2019-03-01
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