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Proposed synchronization circuits connecting wind driven DFIG to the public grid

10.11591/ijpeds.v12.i1.pp151-159
Mohamed Hussein Agamy , Fathe M. Allythi , Adel S. Nada
This paper presents a tested proposal scheme to connect a DFIG driven by a wind turbine to the public grid. This scheme was implemented to drive an automatic transfer switch (ATS). Control of the phase sequence, phase difference, and the frequency of the injected power are achieved using these proposed control circuits. These circuits are practically implemented and laboratory tested. The system allows monitoring the rated frequency, synchronization, and fundamental magnitude. Simulation software such as Multi Sim and Proteus are used for system validation and compatibility. The implemented circuits are used for re-scaling the grid voltage to the logic level for real time comparison and calculations. In addition to the feature of data monitoring, the system can also log these data for the system debugging purposes. The system can be considered as a real time control where the measurements and the correction are made in few milliseconds (fractions of the fundamental cycle). The lower cost control circuits are implemented using an Arduino kit in addition to a discrete digital component. The simulation and experimental results are in satisfactory agreement showing the most salient features of this system.
Volume: 12
Issue: 1
Page: 151-159
Publish at: 2021-03-01

Improvement of sliding mode power control applied to wind system based on doubly-fed induction generator

10.11591/ijpeds.v12.i1.pp441-452
Btissam Majout , Douae Abrahmi , Yasmine Ihedrane , Chakib El Bakkali , Karim Mohammed , Badre Bossoufi
In this work, we are interested in improving the performance of a doubly-fed induction generator (DFIG)-based wind system, by applying a sliding mode control strategy. The objective is the regulation of the active and reactive power, also the voltage and the frequency of the signal injected into the distribution network. The model proposed for the control is based on the sliding mode technique with performance estimators. The proposed model was validated by a simulation on MATLAB/Simulink.
Volume: 12
Issue: 1
Page: 441-452
Publish at: 2021-03-01

Real time face recognition of video surveillance system using haar cascade classifier

10.11591/ijeecs.v21.i3.pp1389-1399
Adlan Hakim Ahmad , Sharifah Saon , Abd Kadir Mahamad , Cahyo Darujati , Sri Wiwoho Mudjanarko , Supeno Mardi Susiki Nugroho , Mochamad Hariadi
This project investigates the use of face recognition for a surveillance system. The normal video surveillance system uses in closed-circuit television (CCTV) to record video for security purpose. It is used to identify the identity of a person through their appearances on the recorded video, manually. Today’s video surveillance camera system usually not occupied with a face recognition system. With some modification, a surveillance camera system can be used as face detection and recognition that can be done in real-time. The proposed system makes use of surveillance camera system that can identify the identity of a person automatically by using face recognition of Haar cascade classifier. The hardware used for this project were Raspberry Pi as a processor and Pi Camera as a camera module. The development of this project consist of three main phases which were data gathering, training recognizer, and face recognition process. All three phases have been executed using Python programming and OpenCV library, which have been performed in a Raspbian operation system. From the result, the proposed system successfully displays the output result of human face recognition, with facial angle within ±40°, in medium and normal light condition, and within a distance of 0.4 to 1.2 meter. Targeted image are allowed to wear face accessory as long as not covering the face structure. In conclusion, this system considered, can reduce the cost of manpower in order to identify the identity of a person in real time situation.
Volume: 21
Issue: 3
Page: 1389-1399
Publish at: 2021-03-01

Active damping method for voltage source inverter-based distributed generator using multivariable finite-control-set model predictive control

10.11591/ijpeds.v12.i1.pp334-344
Jonggrist Jongudomkarn , Warayut Kampeerawat
Despite its advantages, the LCL filter can significantly distort the grid current and constitute a substantially more complex control issue for the grid-connected distributed generators (DGs). This paper presents an active damping approach to deal with the LCL filter's oscillation for the finite-control-set model predictive control (FCS-MPC)-three-phase voltage source inverters (VSIs)-based DG. The new approaches use the multivariable control of the inverter side's filter current and capacitor voltage to suppress the LCL filter resonance. The proposed method has been tested in steady-state and under grid voltage disturbances. The comparative study was also conducted with the existing virtual resistance active damping approaches for an FCS-MPC algorithm. The study validates the developed control schemes' superior performance and shows its ability to eliminate lower-order grid current harmonics and decrease sensitivity to grid voltage distortion.
Volume: 12
Issue: 1
Page: 334-344
Publish at: 2021-03-01

Teacher’s experiences in character education for autistic children

10.11591/ijere.v10i1.20743
Hanif Cahyo Adi Kistoro , Caly Setiawan , Eva Latipah , Himawan Putranta
Character education is also important given to autistic children. This phenomenological research aims to reveal the teacher's experience in teaching character education for autistic children. The participants in this research were 10 teachers from three exceptional schools consisting of public and private exceptional schools. In-depth interview method as a data collection technique. Data analysis using semantic reduction is carried out by the stages of identifying important statements from the results of the interview, determining the theme of the discussion, and describing the significance of the whole the teacher's experience. The results found that character learning for autistic children through three models, namely explanatory, practice, and intensive mentoring. The explanatory model is used to practice the ability of autistic children in terms of building children's concentration and focus. The practice model is used to train autistic children soft skills in terms of strengthening the understanding of the material and its reasoning ability. While the intensive mentoring model for training soft skills autistic children related to the ability of interpersonal relationships and confidence. Therefore, the inclusion of teacher competencies must at a minimum include pedagogical, personal, and social abilities to teach character education for autistic children.
Volume: 10
Issue: 1
Page: 65-77
Publish at: 2021-03-01

Finite frequency H∞control design for nonlinear systems

10.11591/ijpeds.v12.i1.pp567-575
Zineb Lahlou , Abderrahim EL-Amrani , Ismail Boumhidi
The work deals finite frequency H∞ control design for continuous time nonlinear systems, we provide sufficient conditions, ensuring that the closed-loop model is stable. Simulations will be gifted to show level of attenuation that a H∞ lower can be by our method obtained developed where further comparison.
Volume: 12
Issue: 1
Page: 567-575
Publish at: 2021-03-01

Investigation of faulty behavior of the sensorless control switched reluctance motor drives

10.11591/ijpeds.v12.i1.pp88-98
Alexander Krasovsky
The paper presents the results of studies of abnormal conditions in a switched reluctance drive (SRD) due to failures in control algorithms. It discusses one of the most common control algorithms for these drives without the use of sensors, which is simple and easy to configure. The practical application of this algorithm of control showed that various anomalous phenomena could occur in it, expressed, for example, in a sharp increase in the amplitude of the phase current of the motor, and violation of the switching mode. The reasons for these phenomena are not evident and hard to analyze due to the nonlinearity of this drive. To identify these causes and search for measures to eliminate them, we used simulation in the environment of MATLAB/Simulink. The adequacy and effectiveness of the application of the developed simulation models we confirmed by a comparison of the simulation results and the full-scale experiment on real equipment. Theoretical studies and simulation results are in good agreement with the experimental results.
Volume: 12
Issue: 1
Page: 88-98
Publish at: 2021-03-01

Ubiquitous learning in occupational health and safety for vocational education

10.11591/ijere.v10i1.20823
Ketut Ima Ismara , Amin Suharjono , Didi Supriadi
This research aimed to develop instructional media for occupational safety and health android-based for vocational schools. The second aim is to determine the feasibility of instructional media and student responses. The type of research is research and development (R&D) with the Analysis, Design, Development, Implementation, Evaluation (ADDIE) method, namely, analysis, design, development, implementation, and evaluation. The instrument used for data collection was a questionnaire with fourth scales. Data collection used an assessment questionnaire for two experts and 103 users. Research data analysis techniques used quantitative descriptive analysis. This study's results have produced products in the form of android-based instructional media for Occupational Safety and Health. In this study, we designed and developed an application called Zerosicks for mobile devices to help students learn occupational safety and health principles. The results of testing for all features and navigation work well and under their functions. The assessment results by content experts, media experts, and students as users indicate that this media has a very decent level of eligibility. Suggestions for product development are to add videos to the media, provide selected music, and add discussion forums for users.
Volume: 10
Issue: 1
Page: 285-292
Publish at: 2021-03-01

Undergraduates entrepreneurial intention: Holistic determinants matter

10.11591/ijere.v10i1.20733
Tan Owee Kowang , Siti Zulaiha Binti Abdulah Apandi , Ong Choon Hee , Goh Chin Fei , Mohd Saiful Izwaan Saadon , Mohamad Rosni Othman
The role of entrepreneurship in job creation and unemployment reduction is well established by prior studies. Hence, one of the ways to address the unemployment issue among young graduates in Malaysia is to explore how entrepreneurial intention could be embraced into the broader context of the country's education system. Empirical research found that prior studies on entrepreneurship education in Malaysia tends to focus on reviewing educational policies, issue and challenges. The concept of the entrepreneurial intention determinants beyond entrepreneurial education remains ambiguous. Hence, this study advances the discussion in entrepreneurship education by reviewing determinants for entrepreneurial intention from holistic perspective by integrating Model of Personality Traits and the theory of planned behavior (TPB). Five determinants for entrepreneurial intention are identified from literature review, which are entrepreneurship attitude, subjective norm, behavior control, entrepreneurship education and personality traits. The study is quantitative based, 360 questionnaires were distributed to the undergraduates from three faculties of a public university in Malaysia, with 199 responded. Data was analyzed via Pearson correlation and ANOVA analysis. Finding from the study suggested all the five entrepreneurial determinants are significantly correlated with entrepreneurial intention, and there is no significant difference on entrepreneurial intention based on faculty. However, one of the remarkable finding is Entrepreneurship Education is viewed as determinant with the lowest correlation coefficient with entrepreneurial intention. The implication of this finding is perhaps the content of entrepreneurial education shall emphasize on cultivating students’ entrepreneurial attitude, behavioral and personality rather than the theoretical part of entrepreneurial and entrepreneurship.
Volume: 10
Issue: 1
Page: 57-64
Publish at: 2021-03-01

Fault diagnosis of a squirrel cage induction motor fed by an inverter using lissajous curve of an auxiliary winding voltage

10.11591/ijeecs.v21.i3.pp1299-1308
Yakout Khadouj Jelbaoui , El Menzhi Lamiaà , Abdallah Saad
The development of electronic power components has allowed the increase of the induction machine performance. Indeed, monitoring squirrel cage induction motors driven through rectifiers and inverters has been a major concern. This paper presents a new method to diagnose the combination inverter-machine faults. This technic considers an auxiliary winding which is a small coil inserted between two stator phases. It is based on Lissajous curve of this auxiliary winding voltage Park components. For this purpose, modeling the electromechanical conversion chain is necessary. The focus will particularly be on modeling both the squirrel cage induction machine and the inverter in a non-defected case which is a reference. Moreover, the explicit expressions developed for the inserted winding voltage and its Park components will be presented. The simulation results show the effectiveness of the proposed method.
Volume: 21
Issue: 3
Page: 1299-1308
Publish at: 2021-03-01

Effect of blade pitch angle on the aerodynamic characteristics of a twisted blade horizontal axis wind turbine based on numerical simulations

10.11591/ijpeds.v12.i1.pp511-519
Rajendra Roul , Awadhesh Kumar
The present work includes a study of the impact of varying pitch angles and angular velocity on the performance parameters of a horizontal axis wind turbine using computational fluid dynamics. Simulations have been made using commercial Ansys 15 software. Seven pitch angles are chosen for study, i.e., 0° , 5 ° , 10° , 15° , 20° , 25° , and 28°, and two angular velocity values of 1.57 rad/sec and 2.22 rad/sec are used for simulation. The turbulence model used is shear stress transport (SST) K-ω. A detailed study of the influence of pitch angle on the aerodynamic characteristics of the wind turbine is highlighted. Performance parameters like torque and power have been found to exhibit random variability with a change in wind velocity and pitch angle. The verification of computational fluid dynamics (CFD) with the standard empirical formula is highlighted. The best pitch angle is noted for the best power coefficient.
Volume: 12
Issue: 1
Page: 511-519
Publish at: 2021-03-01

A hybrid de-noising method for mammogram images

10.11591/ijeecs.v21.i3.pp1435-1443
Rashid Mehmood Gondal , Saima Anwar Lashari , Murtaja Ali Saare , Sari Ali Sari
In general, mammogram images contaminated with noise which directly affect images quality. Several methods have been proposed to de-noise these images, however, there is always a risk of losing valuable information. In order to overcome the loss of information, the present study proposed a hybrid denoising method for mammogram images. The proposed hybrid method works in two steps: Firstly, preprocessing with mathematical morphology was applied for image enhancement. Secondly, global unsymmetrical trimmed median filter (GUTM) is applied to de-noise image. Experimental results prove that proposed method work well for mammogram images. Hence, the study provided an alternative method for denoising mammogram images.
Volume: 21
Issue: 3
Page: 1435-1443
Publish at: 2021-03-01

Load flow analysis using Newton-Raphson method in presence of distributed generation

10.11591/ijpeds.v12.i1.pp489-498
Tebbakh Noureddine , Labed Djamel
Distributed generations (DG), specially including renewable sources such as wind and sun are offering several opportunities for the currently in existence distribution networks and becoming one of the keys of treatment of its problems. Knowing the effects of each kind of DG on distribution networks is a primordial task because DG impacts differ from one kind to another. In this paper, we have analyzed and compared the effects of two kinds of DG, DG which provides real power only and DG which provides real power and reactive power at the same time connected at the critical bus in DN on the voltage profile, real and reactive power losses. We have proposed Newton Raphson method using Matlab to investigate the impacts of these two kinds of DG on 57-bus IEEE distribution test system. The obtained results have been exposed in detail at the end of this paper.
Volume: 12
Issue: 1
Page: 489-498
Publish at: 2021-03-01

Harmonics elimination for DC/DC power supply based on piezoelectric filters

10.11591/ijpeds.v12.i1.pp356-363
Hasan Ma Almgotir , Enaam A. Khaliq Ali , Wedian H. Abd al ameer , Mustafa A. Fadel Al-Qaisi
This research presents a study, modelling and simulation of the piezoelectric material work as filters (piezoelectric filter) used to eliminate the harmonics in power electronic circuits, high order harmonics are generating due to the high switching frequencies and circuit equipment, detailed simulation is achieved for the piezoelectric filter tested in full-bridge DC/DC converter circuit with resistive load works as dc power supply (12 to 48 volt). As a result, the uses of piezoelectric filters have a great impact on harmonics elimination, which leads to reduce the overall total harmonic distortion leads to increase the efficiency, as well as the output voltage from the dc power supply remain constant by varying the load resistance over a wide range. The dc power supply circuit including the piezoelectric filter has been simulated using PSIM (V9.1) power electronic circuit simulation software.
Volume: 12
Issue: 1
Page: 356-363
Publish at: 2021-03-01

Sectoral dual-polarized MIMO antenna for 5G-NR band N77 base station

10.11591/ijeecs.v21.i3.pp1611-1621
Muhsin Muhsin , Afina Lina Nurlaili , Aulia Saharani , Indah Rahmawti Utami
Massive internet of things (IoT) in 5G has many advantages as a future technology. It brings some challenges such as a lot of devices need massive connection. In this case, multiple-input multiple-output (MIMO) systems offer high performance and capacity of communications. There is a challenge of correlation between antennas in MIMO. This paper proposes three-sectors MIMO base station antenna for 5G-New Radio (5G-NR) band N77 with dual polarized configuration to reduce the correlation. The proposed antenna has a maximum coupling of -16.90 dB and correlation below 0.01. The obtained bit error rate (BER) performance is very close to non-correlated antennas with bandwidth of 1.87 GHz. It means that the proposed antenna has been well designed.
Volume: 21
Issue: 3
Page: 1611-1621
Publish at: 2021-03-01
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