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29,905 Article Results

Detailed modeling of two diode photovoltaic module using MATLAB simulik

10.11591/ijpeds.v10.i3.pp1603-1612
Habbati Bellia Assia , Moulay benine Fatima
This paper proposes an accurate model of Photovoltaic Module. The model is presented in details and simulated by Matlab Simulink. The PV module is presented as a two diode model with the series’ and parallels’ resistances. The method is used to obtain the parameters of the module by using data provided by the manufacturer. To verify the accuracy of the proposed model, a comparison is done between the present results and those in a previous paper in which the single diode detailed model was studied. The same type of modules (PWX 500) is used to compare and validate results. The weather data as illumination and temperature are taken as input variables when current and Power are output variables. For the validation of the proposed model, it is used to power a resistive load by using a boost converter controlled by à Maximum Power Point Tracking method. The proposed method is very detailed and can be useful for PV researchers for their works.
Volume: 10
Issue: 3
Page: 1603-1612
Publish at: 2019-09-01

Fault detection and classification in wind turbine by using artificial neural network

10.11591/ijpeds.v10.i3.pp1687-1693
N. F. Fadzail , S. Mat Zali
Wind turbine is one of the present renewable energy sources that has become the most popular. The operational and maintenance cost is continuously increasing, especially for wind generator. Early fault detection is very important to optimise the operational and maintenance cost. The goal of this project is to study fault detection and classification for a wind turbine (WT) by using artificial neural network (ANN). In this project, a single phase fault was placed at 9 MW doubly-fed induction generator (DFIG) WT in MATLAB Simulink. The WT was tested under different conditions, i.e., normal condition, fault at Phase A, Phase B and Phase C. The simulation results were used as inputs in the ANN model for training. Then, a new set of data was taken under different conditions as inputs for ANN fault classifier. The target outputs of ANN fault classifier were set as ‘0’ or ‘1’, based on the fault condition. Results obtained showed that the ANN fault classifier outputs had followed the target outputs. In conclusion, the WT fault detection and classification method by using ANN were successfully developed.
Volume: 10
Issue: 3
Page: 1687-1693
Publish at: 2019-09-01

The power of social networking sites: Student involvement toward education

10.11591/ijere.v8i3.20352
M. Norhailawati , Lina Handayani , HU Kalsum , Zainuri Saringat , A. Aidahani , SH Bakri , Rully Charitas Indra Prahmana
Social networking web sites is not a new medium for users. The growth of this media helps students communicate and socialize with their friends or followers and used for education. The retention number of students is an issue or real problem in higher educational institutions since it is related to institution overall performance. This research focused on how students’ involvement in social network web site for educational purposes can have a positive effect to their studies and can help institution to retain number of students in the institution. During the research study, students did give full cooperation and involvement in the group that created and dedicated to their collaborative learning. Facebook is the social networking website that used to support learning. The research method applied was survey and the questionnaires distributed to 40 students who got probations result (the Cumulative Grade Point Average (CGPA) was below 2.00) from various academic programs. The result showed that social network website plays an important role in education. The finding also showed that the probation students improve their CGPA and status, while the institution able to maintain their student retention number.
Volume: 8
Issue: 3
Page: 549-556
Publish at: 2019-09-01

A bidirectional resonant converter based on wide input range and high efficiency for photovoltaic application

10.11591/ijpeds.v10.i3.pp1469-1475
Ibrahim Alhamrouni , M. R. Bin Hamzah , Mohamed Salem , Awang Jusoh , Azhar Bin Khairuddin , Tole Sutikno
This work highlights a modular power conditioning system (PCS) in photovoltaic (PV) applications which consists with a DC-DC converter. The converter is able to regulate and amplify the input DC voltage produced by the PV panal. The implementation of Mosfet as bidirectional switch on the converter yields greater conversion ratio and better voltage regulation than a conventional DC-DC step up converter and PWM resonant converter. It also reduces the switching losses on the output DC voltage of the converter, as the MOSFET switches on primary winding of converter switch on under ZVS conditions. The proposed resonant converter has been designed, with the modification of series resonant converter and PWM boost converter that utilizes the high frequency of AC bidirectional switch to eliminate the weaknesses of used converters. The topology of the proposed converter includes the mode of operations, designing procedure and components selection of the new converter elements. This topology provides a DC output voltage to the inverter at range of about 120Vac-208 Vac. 
Volume: 10
Issue: 3
Page: 1469-1475
Publish at: 2019-09-01

A novel control strategy for power quality improvement in grid-connected solar photovoltaic system

10.11591/ijeecs.v15.i3.pp1264-1272
Pankaj Gakhar , Manoj Gupta
In this paper, a novel and dynamic, current control based inverter control strategy has been used for energy optimization and power quality improvement in a grid-connected solar photovoltaic plant using a PI controller. The output of the plant is delivered to the grid passing through a boost converter controlled by an MPPT controller and an inverter. The control strategy proposed offers the flexibility to keep control of active as well as reactive power being injected straight into the grid and also helps in mitigating the total harmonic distortion levels. Also, the effect of the conventional PI controller and PI controller optimized through Genetic Algorithm has been compared. The GA-PI controller has been found effective in reducing the Total Harmonic Distortion in the current injected in the grid. The effectiveness of the work has been observed by using a MATLAB/SIMULINK environment.
Volume: 15
Issue: 3
Page: 1264-1272
Publish at: 2019-09-01

Comparison of different magnet arrangement on performance of flux reversal permanent magnet (FRPM) machine

10.11591/ijpeds.v10.i3.pp1207-1214
M. H. Remlan , R. Aziz , S Salimin
This paper offers the analysis of performance of Flux Reversal Permanent Magnet (FRPM) machines with different type of magnet arrangements. There are two designs that have been proposed in this report, which one of them has a pair of permanent magnets (PM) with alternate polarities place on surface of stator tooth and the polarities of two adjacent PM at these two stators are identical. This PM arrangement is called as NS-SN configuration. Second design is NS-NS configuration that has different PM polarities on different stator tooth. By comparing this PM arrangement, generally the NS-NS configuration offers high speed and power. However, the NS-SN configuration shows higher maximum torque compared to the previous design. The design process for both configurations is completely using finite element analysis (FEA) which is JMAG-Designer. To make sure the coil phase is in correct position, the design configuration with coil arrangement tests are evaluated. Finally, each flux of both designs been observed by analyse their torque with various armature current density.
Volume: 10
Issue: 3
Page: 1207-1214
Publish at: 2019-09-01

Real-time implementation of a novel hybrid fuzzy sliding mode control of a BLDC motor

10.11591/ijpeds.v10.i3.pp1167-1177
Ali Mousmi , Ahmed Abbou , Yassine El Houm
This paper presents a novel hybrid control of a BLDC motor using a mixed sliding mode and fuzzy logic controller. The objective is to build a fast and robust controller which overcome classical controllers’ inconveniences and exploit the fast response of brushless dc motors characterized by an intense torque and fast response time. First the paper study pros and cons of both sliding mode and fuzzy logic controllers. Then the novel controller and its stability demonstration are presented. Finally the proposed controller method is used for the speed control of a BLDC motor 3KW. The obtained results are compared with those of a fuzzy logic and a conventional sliding mode controller. It allows to show performance of the proposed controller in terms of speed response and reaction against disturbances, which is improved more than 5 times without losing stability or altering tracking accuracy
Volume: 10
Issue: 3
Page: 1167-1177
Publish at: 2019-09-01

Enhanced decoupled current control with voltage compensation for modular multilevel converter (MMC) based STATCOM

10.11591/ijpeds.v10.i3.pp1483-1499
Abdurrahman Umar Lawan , Haider A.F. Almurib , Jeen G. Khor
This paper presents the application of modular multilevel converter (MMC) as a static compensator (STATCOM) for reactive current control. The current control is mostly achieved using proportional controller, proportional-integral (PI) controller, and hysteresis controller among others. PI controllers have the advantage of low harmonics and small variations.  However, due to the PI controller’s dependency on the system parameters and also due to the variations within the MMC during capacitors voltage control, variation in the MMC performance during the STATCOM non-ideal operations occur. To mitigate this, an improved performance of MMC will be presented using vector-based compensation concept. The proposed control will be introduced to depress the effect of the dynamics of the MMC based STATCOM non-ideal variations considering the impact of the voltage disturbance. This will be achieved by the introduction of voltage variables to subtract the transient variations from PI controllers’ outputs at the grid-interface; thus, improving the performance.
Volume: 10
Issue: 3
Page: 1483-1499
Publish at: 2019-09-01

PV integrated series active filter for sag voltage and harmonic compensation

10.11591/ijpeds.v10.i3.pp1255-1262
Abdelmalek Meftouhi , Othmane Abdelkhalek , Ahmed Allali , Abdallah Ben Abdelkader , Toufik Toumi
The use of loads in the past few days is becoming vast, giving an alarm signal to the power system and electronics engineers in terms of power quality. Due to the large amount of non-linear power electronics, utilities frequently experience voltage and harmonic distortions every day. In this paper, the combination of the Series active power filter SAPF with a PV source is deliberated. The PV based on the SAPF aims to compensate voltage deviations or disturbances that occur in the system caused by power quality issues. The proposed system consists of a PV source connected to the DC link through two dc-dc converters, the first extracts the maximum power of the PV source through pulse with modulation PWM signals generated from the maximum power point tracker MPPT controller. Thus, the second converter is used to regulate the high voltage side of the converter through closed control loops using Fuzzy Logic Controller FLC, in addition to a voltage source inverter VSI and a series injection transformer. Despite of fluctuations of the DC link during the compensation of the needed energy, MPPT and closed control loops generate PWM signals to the switching devices of dc-dc boost converters in order to extract maximum PV power and to maintain the bus voltage within its limits and around its reference values respectively. The proposed topology is simulated in Matlab Simulink software, where simulation results show that the proposed PV based SAPF can efficiently reduce problems of voltage sag and harmonic.
Volume: 10
Issue: 3
Page: 1255-1262
Publish at: 2019-09-01

Review of AC-DC power electronic converter topologies for power factor correction

10.11591/ijpeds.v10.i3.pp1510-1519
Rajagopal Sasikala , R. Seyezhai
Increased harmonic content and low power factor in power systems caused by power converters have been of great concern. To overcome this, several converter topologies employing advanced semiconductor devices and control schemes have been proposed. The aim of this paper is to identify a low cost, small size, efficient and reliable ac to dc converter to meet the input performance index of uninterrupted power supply. In this paper, comparison between three converters namely AC-DC Cuk rectifier, Fly back converter & Interleaved SEPIC converter have been carried out. For the above converters both bridged and bridgeless topologies have been analysed. The working of all the three types of converter has been   illustrated with relevant waveforms followed by the simulation results. Comparison of the three converters have been done based on the parameters namely Displacement Factor, Supply Power Factor& supply THD. The results are verified.
Volume: 10
Issue: 3
Page: 1510-1519
Publish at: 2019-09-01

Performance evaluation of multi-phase permanent magnet synchronous motor based on different winding configurations and magnetization patterns

10.11591/ijpeds.v10.i3.pp1197-1206
M. Rezal , D. Ishak
Permanent magnet synchronous motor (PMSM) is the most reliable and efficient machine that widely used in robotics and automation, industrial applications, electric vehicles, home appliances, aircraft and aerospace technology due to its high efficiency, good dynamic performance and high torque density. In this paper, the influence of various types of winding configuration and different magnetization patterns in the performance of a five-phase PMSM is investigated. Three types of magnetization patterns such as radial magnetization (RM), parallel magnetization (PaM), and multi-segmented Halbach magnetization (SH) are applied to the five-phase 10-slot/4-pole PMSM during open-circuit and on-load conditions. A 2D finite element method (FEM) is intensively used in this investigation to model and predict the electromagnetic characteristics and performance of the PMSM. The detailed results from the finite-element analysis (FEA) on the cogging torque, induced back-emf, airgap flux density and electromagnetic torque are analysed. The induced back-emf of the machine is computed further into its harmonic distortions. Additionally, the skewing method for minimization of cogging torque of PMSM is proposed. From the results, it is observed that the five-phase, 10-slot/4-pole PMSM with double layer distributed winding and parallel magnetization gives the best machine performance.
Volume: 10
Issue: 3
Page: 1197-1206
Publish at: 2019-09-01

Hardware design of a scalable and fast 2-D hadamard transform for HEVC video encoder

10.11591/ijeecs.v15.i3.pp1401-1410
Heh Whit Ney , Ab Al-Hadi Ab Rahman , Ainy Haziyah Awab , Mohd Shahrizal Rusli , Usman Ullah Sheikh , Goh Kam Meng
This paper presents the hardware design of a 2-dimensional Hadamard transform used the in the rate distortion optimization module in state-of-the-art HEVC video encoder. The transform is mainly used to quickly determine optimum block size for encoding part of a video frame. The proposed design is both scalable and fast by 1) implementing a unified architecture for sizes 4x4 to 32x32, and 2) pipelining and feed through control that allows high performance for all block sizes. The design starts with high-level algorithmic loop unrolling optimization to determine suitable level of parallelism. Based on this, a suitable hardware architecture is devised using transpose memory buffer as pipeline memory for maximum performance. The design is synthesized and implemented on Xilinx Kintex Ultrascale FPGA. Results indicate variable performance obtained for different block sizes and higher operating frequency compared to a similar work in literature. The proposed design can be used as a hardware accelerator to speed up the rate distortion optimization operation in HEVC video encoders.
Volume: 15
Issue: 3
Page: 1401-1410
Publish at: 2019-09-01

Energy efficiency enhancement using dynamic voltage restorer (DVR)

10.11591/ijpeds.v10.i3.pp1308-1316
Muhammad Murtadha Othman , Nik Muhamad Lokman Fahmi Nek Rakami , Zulkiffli Abdul Hamid , Ismail Musirin , Mohammad Lutfi Othman
Dynamic voltage restorer (DVR) is a device that can compensate harmonic, voltage sag and voltage swell condition that exists in a three-phase system. Other than that, DVR can also be used to enhance the energy efficiency or energy saving by reducing excessive amount of incoming power via the reduction incoming voltage at allowable limit. The DVR can inject the required voltage in the system so that the interruption of supply voltage can be compensated. The compensation of voltage supply interruption is improved based on the hysteresis voltage output of controller used in the DVR to detect the difference between reference voltage and disrupted voltage. The hysteresis voltage control mainly controlled by relays switching so that the signal can be sent to IGBT switches controller. The hysteresis voltage control and unipolar SPWM is supplied to control the IGBT switches by the DC supply for voltage interruption compensation. The unipolar SPWM technique converts the DC supply voltage into AC supplied voltage, thus making the DVR injection become easier to inject the AC voltage into the system to compensate voltage sag and voltage swell.
Volume: 10
Issue: 3
Page: 1308-1316
Publish at: 2019-09-01

What is critical thinking? A longitudinal study with teacher candidates

10.11591/ijere.v8i3.20254
Serap Yılmaz Özelçi , Gürbüz Çalışkan
Critical thinking skills that enhance the ability of individuals to understand and make sense of the world and events and situations around them are one of the foremost research areas in the educational system of various countries. As a critical thinking individual, decisions made by the teacher in his/her class, the activities he/she has performed and the explicit and implicit messages given by him/her to the class are clearly observed by the students. It is believed that the situation of teachers’ having critical thinking skills and critical thinking personality effects on students' perceptions and achievements about critical thinking. In this context, the aim of the research is to determine the perceptions of the teacher candidates about critical thinking and to observe the changes in these perceptions over time. Interviews were held with 11 prospective teachers for two times for 4 years and their thoughts on critical thinking were examined. According to the findings obtained, the thoughts of the teacher candidates regarding the critical thinking do not change over time but they are not seen enough. Teacher candidates make decisions with emotional references and they are reluctant to inquire and research.
Volume: 8
Issue: 3
Page: 495-509
Publish at: 2019-09-01

Determination of the level of pedagogical formation students’ academic locus of control

10.11591/ijere.v8i3.18166
Süleyman Can , Erdil Durukan
Academic locus of control has an important place in explaining students’ behaviors in educational settings. The purpose of the current study is to determine the level of the pedagogical formation students’ academic locus of control and to investigate whether this level varies depending on some variables. The study employed the survey model, one of the quantitative research methods. The universe of the study is comprised of the students enrolled at the pedagogical formation program initiated in the fall term of 2015-2016 academic year in Muğla Sıtkı Koçman University and the sampling consists of 397 pedagogical formation students. As the data collection tool, the academic locus of control scale was used in the current study. It was concluded that the pedagogical formation students’ level of academic locus of control is medium. It was also found that the students’ academic locus of control, internal locus of control and external locus of control do not vary significantly depending on gender and department; yet, vary significantly depending on age. Furthermore, the pedagogical formation students’ level of satisfaction was found to be significantly correlated with the external locus of control but not with the internal locus of control and academic locus of control.
Volume: 8
Issue: 3
Page: 531-536
Publish at: 2019-09-01
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