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31,456 Article Results

Simplified down sampling factor based modified SVPWM technique for cascaded inverter fed induction motor drive

10.11591/ijaas.v9.i1.pp20-26
Ravi Kumar Bhukya , P. Satish Kumar
This paper presents a rivew, investigation and performance analysis of novel down samples factor based modified space vector PWM is called clamping SVPWM technique for cascaded Multilevel Invereter fed to Induction motor drive. In this paper the reference sine wave generated as in case of conventional off set injected SVPWM technique is modified by down sampling factor the reference wave by order of 10. The performance analyses of this modulation strategies are analyzed by apply for five level, seven level, nine level and eleven level inverter. The performance analysis of cascaded inverter interms of line voltage, stator current, speed, torque and total harmonic distortion. The results are depicting that PD PWM is more effective among the four proposed PWM technique. It is observed that the CSV Pulse width modulation ensures excellent, close to optimized pulse distribution results compared to SPWM technique and also 11-level inverter beter performance in case of low THD and better foundemental output voltages comapared to 5, 7, 9-level inverter. The proposed technique has been simulated using MATLAB/SIMULINK software. This proposed technique can be applied to N-level multilevel Inverter also.
Volume: 9
Issue: 1
Page: 20-26
Publish at: 2020-03-01

New model of electric traction drive based sliding mode controller in field-oriented control of induction motor fed by multilevel inverter

10.11591/ijpeds.v11.i1.pp242-250
Chaymae Laoufi , Zouhair Sadoune , Ahmed Abbou , Mohammed Akherraz
This paper presents a new model of electric traction drive for electric vehicle. The sliding mode speed controller applied in the Indirect Rotor Field Oriented Control is used to control the induction motor fed by the five levels Neutral Point Clamped inverter (NPC). The simulation results showed the high performances dynamics and high robustness of the proposed model, that are reflected by faster startup and good speed tracking performances in terms of response time, oscillations and disturbance rejection. Also, a comparative study between different inverter topologies: two levels inverter, three levels NPC inverter and five levels NPC inverter has been carried out. From the spectral analysis, the five-levels NPC inverter fed drive provides better dynamics of voltage and current with reduced total harmonic distortion (THD).
Volume: 11
Issue: 1
Page: 242-250
Publish at: 2020-03-01

Coordination of directional overcurrent and distance relays based on nonlinear multivariable optimization

10.11591/ijeecs.v17.i3.pp1194-1205
Tahseen Ali Abd Almuhsen , Ahmed Jasim Sultan
To ensure stability, security, and protection of electrical equipment from the damage the suitable coordination must be made in interconnected networks. In this paper, the nonlinear multivariable optimization techniques have been used with different performance indexes: Sequential quadratic programming (SQP), Sequential quadratic programming legacy (SQP-Legacy), Interior-Point and Active-Set for IEEE- 8 bus test system.  This system consists of twenty-eight protective relays divided into fourteen directional overcurrent relays (DOCR) and fourteen distance relays (DR). It has been tested in the ETAP environment to obtain three-phase short circuit current at the near and far end faults and operating time for all DOC relays for near-end fault as well as test the second zone time for distance relays (TZ2) with pilot signal (WP)and without pilot signal (WOP) of the proposed algorithm was used to reduce overall operating time of DOC relays and obtain optimal values for time multiplier setting (TMS) and TZ2 with the different coordination time interval (CTI) between main and backup relays. The simulation results were validated in ETAP program prove that the effectiveness of the Active-Set to minimize the TMS and TZ2 for the system.
Volume: 17
Issue: 3
Page: 1194-1205
Publish at: 2020-03-01

Third harmonic injection pulse-width modulation technique for a five-phase voltage source inverter

10.11591/ijeecs.v17.i3.pp1607-1617
Yasir M.Y. Ameen , Bashar A. Fadheel , Ali J Mahdi
Nowadays application of advanced power electronic technology enables producing an AC supply with a phase number higher than three-phase. Five-phase voltage source inverters (5ph-VSI) have been used in advanced power electronic drives to improve the reliability of the drive system and to boost the power capability of the converter as well as to their other inherent merits. This paper shows the mathematical analysis and simulation of the third harmonic injection pulse width modulation (THI-PWM) 5ph-VSI connected with inductive load in three scenarios i.e. star, Pentagon and pentacle. The presented THI-PWM technique for 5ph-VSI aims to increase the inverter fundamental voltage and hence to maximize the utilization of the DC bus without causing over-modulation. The simulation results are compared with typical sinusoidal pulse width modulation (SPWM) and the 10-step mode operation. The proposed scheme may be considered as a compromise case between the two reference cases;  as low harmonic components compared with 10-step mode operation and a high utilization factor compared with SPWM.
Volume: 17
Issue: 3
Page: 1607-1617
Publish at: 2020-03-01

Test, measurement, and evaluation: Understanding and use of the concepts in education

10.11591/ijere.v9i1.20457
Dickson Adom , Jephtar Adu-Mensah , Dennis Atsu Dake
Test, measurement, and evaluation are concepts used in education to explain how the progress of learning and the final learning outcomes of students are assessed. However, the terms are often misused in the field of education, especially in Ghana. The objective of the study was to thoroughly explain the concepts to assist educationists and researchers in the field of education to better apply them in educational discourses. The study also suggests best practices in setting test items in measuring students’ learning outcomes while showing policy directions to assist educationists and researchers in the field of educational evaluation.
Volume: 9
Issue: 1
Page: 109-119
Publish at: 2020-03-01

Flight cost calculation for unmanned air vehicle based on path length and heading angle change

10.11591/ijpeds.v11.i1.pp382-389
Sanjoy Kumar Debnath , Rosli Omar , B.S.S.K. Ibrahim , Susama Bagchi , Elia Nadira , Faisal Amin , Bashir Bala Muhammad
This paper proposes a method to calculate a flight cost of an unmanned aerial vehicle (UAV) considering its change of heading angle though there are many reasons that cause the energy consumption. The proposed approach demonstrates that when a UAV moves from a starting position/point to a target/goal position/point, if the number of obstacle increases, the number of heading change would also increase. As a result, it raises the energy consumption of the UAV. It also shows that the magnitude of heading change would affect the energy consumption proportionally. The theoretical analysis as well as the simulation outcome proves the usefulness of the proposed technique. 
Volume: 11
Issue: 1
Page: 382-389
Publish at: 2020-03-01

Applied measurement of the motor speed controller for washing machine with random loads, part II

10.11591/ijpeds.v11.i1.pp442-450
Khalid Mohammed , Jabbar A.F. Yahaya , Reyasudin Basir Khan
This research presents a very important industrial issue of controlling the production target, despite changing loads. Engines of various types, whether synchronous or synchronous, operate on single and three phase AC, DC motors or special motors such as stepper and servo. In all these motors, the speed control of the torque and speed of the above motors has gained considerable importance. There are three main ways reviewed in the current search, the second that completes the previous research referred to in the references. The three methods are PID method, LQR method and feeding –forward control methods. A real DC motor was used in electrical engineering machine laboratory at University of Diyala, Iraq. Where the actual parameters of the DC motor were actually calculated. The practical parameters were then integrated into the three control method Matlab codes for the purpose of comparing the results and representing the motor performance in the indicated control methods.
Volume: 11
Issue: 1
Page: 442-450
Publish at: 2020-03-01

Electricity market strategies applied to microgrid development

10.11591/ijpeds.v11.i1.pp530-546
Carlos Ulises Cassiani , John Edwin Candelo Becerra , Fredy Edimer Hoyos
Over the last decade, the liberalization of the electricity market has been sought. In order to fight the environmental impact caused by the use of fossil fuels, it is aimed to change the current system of centralized generation and achieve a more distributed one; distributed resources can use renewable or non-renewable resources as main source of energy, one way to implement these distributed systems is through micro electrical grids, since these allow improving energy efficiency. The way to efficiently implement this type of network is an important point to be solved in future research and even more if the way of conducting an electricity market for different communities is unknown. That is why this text presents the characteristics of microgrids, the management of microgrids, and the wide and promising panorama of future opportunities for a great development of this type of grid.
Volume: 11
Issue: 1
Page: 530-546
Publish at: 2020-03-01

A colour recognition device for the visually disabled people

10.11591/ijeecs.v17.i3.pp1322-1329
Norazila Othman , Mohd Zarhamdy Md. Zain , Iskandar Shah Ishak , Abdul Rahim Abu Bakar , Mastura Ab Wahid , Maziah Mohamad
Visually disabled people rely on the sense of touch and sense of hearing to help them recognise anything in their everyday life. Colours, however, is also important in giving information about things such as the colour of cash note (blue, green, red, orange and purple), the colour of spices (yellow turmeric, red chilli, green chilli) and colour of cloth. Without a sense of visual, they are not able to recognise colour and perceive the beauty of colour. This study was conducted to develop a colour recognizer for visually ‎disabled people‎. Colour recogniser used the colour sensor to sense the colour, microcontroller to recognise the colour and notify the user using a speech generator and speaker. The device is powered by dry cell batteries and designed to be user-friendly, practical and portable. The testing is done to show that this device was able to sense and differentiate 12 primary colours in the RGB colour wheel and validated the accuracy of this devices.
Volume: 17
Issue: 3
Page: 1322-1329
Publish at: 2020-03-01

Interpretation of sweep frequency response analysis traces on inter-turn short circuit fault

10.11591/ijpeds.v11.i1.pp309-316
Nurul Farahwahida Md Yasid , A. A. Alawady , M. F. M. Yousof , S. Al-Ameri , M. S. Kamarudin
Sweep frequency response analysis (SFRA) is a reliable method for detection and diagnosis of faults in the active part of transformers. However, although SFRA is widely employed, the interpretation of SFRA signature is still a challenge and require experts to analyse them. This is due to lack of guideline and standard for SFRA signature interpretation and clarification. This paper presents the interpretation of SFRA signature by classification and quantification on inter-turn short circuit fault on the transformer winding. The short-circuited turns fault on HV winding phase “A” was practically simulated on three different units of three-phase transformers. The results of simulated fault are presented and discussed. A conclusion was drawn which provides the interpretation of the SFRA response due to inter-turn short circuit fault case by using a statistical indicator which is NCEPRI algorithm.
Volume: 11
Issue: 1
Page: 309-316
Publish at: 2020-03-01

A smart energy consumption manager based on protues simulation

10.11591/ijpeds.v11.i1.pp143-150
Mohammed Abdulhussein Mohammed , Alaa Desher Farhood , Ahmed Jabbar Abid
In the proposed system, a strategy for the control of energy consumption by home appliances is provided. The statistics of previous energy production and consumption of a case study city are used in providing the strategy. In the design of the proposed system, home appliances are categorized into three levels of priority, even though it can be more than three. In this article the control of energy consumption is achieved using a real time energy consumption manager (ECM) based on stored data without the need for real time communication. The system which is proposed here is affordable and simple. Also, it does not require grid upgrade or power line communication through the grid. 
Volume: 11
Issue: 1
Page: 143-150
Publish at: 2020-03-01

Design and implementation of an impressed current cathodic protection system for buried metallic pipes (part II) (considering Al-Quds gas station in Baghdad)

10.11591/ijpeds.v11.i1.pp275-283
Saif al deen H Mohammed , Isam M Abdulbaqi
In this part, the implementation of the Cathodic Protection (CP) station in a new position is done due to the analytical study of the part (I) [1]. Also, a PV fed self-adjusted DC-DC converter is designed and implemented for this purpose, and Aluminum anodes designed and manufactured for the sake of approving the proposed CP station operation. A field test shows enhanced results due to the National Association of Corrosion Engineering NACE standard. An edit has been made on the main empirical formula that is previously intended for the design of the same CP system. The proposed CP station is very flexible, more accurate, of lower cost, and needs little maintenance as compared with the already existing CP station.
Volume: 11
Issue: 1
Page: 275-283
Publish at: 2020-03-01

Electrical grid reliability assessment by fault tree analysis

10.11591/ijeecs.v17.i3.pp1127-1134
Ahmed Agwa , Zaky Matter , Ezzat Eisawy , Hamdy Hassan
The main rule of an electrical grid is to supply electrical energy to consumers as economically as possible, and with an adequate degree of reliability. Reliability is an essential measure and important component of all power system planning and operation procedures. In this paper, the electrical grid reliability is evaluated by Fault Tree (FT) analysis. In this method Alternating Current (AC) load flow analysis is combined with the FT technique. The electrical grid reliability is calculated based on the unreliability of the power supplied to the loads. The verification of the method is performed on a part of the Egyptian electrical grid (Alexandria zone 17-bus). The electrical grid components are sorted according to their influence on the electrical grid reliability.
Volume: 17
Issue: 3
Page: 1127-1134
Publish at: 2020-03-01

Voltage control of switched reluctance generator using grasshopper optimization algorithm

10.11591/ijpeds.v11.i1.pp75-85
Mohamed Bahy , Adel S. Nada , Sayed H. Elbanna , Mohamed A. M. Shanab
This paper presents a terminal voltage control approach of a Switched Reluctance Generator (SRG) based wind turbine generating systems. The control process is employed using a closed loop stimulated by the error between the reference voltage and the generator output voltage due to load and wind speed variation. This error feeds the tuned Proportional Integral controller (PI).Tuning of PI controller by conventional analysis methods is difficult by the existence of a significant non-linearity. A novel strategy method is presented here to determine optimum PI controller parameters of voltage control of SRG using Grasshopper Optimization Algorithm (GOA). This proposed approach is a simple and effective algorithm that is able to solve many optimization problems. The simplicity of algorithm provides high quality tuning of optimal PI controller parameters. The integral of time weighted squared error (ITSE) is used as the performance of the proposed GOA-PI controller. The effectiveness of the proposed strategy is tested with the three-phase 12/8 structure SRG. Outcomes indicate the supremacy of GOA over Whale Optimization Algorithm (WOA) and Particle Swarm Optimization (PSO) in terms of control performance measures.
Volume: 11
Issue: 1
Page: 75-85
Publish at: 2020-03-01

Conceptual model for improving quality of teacher in Indonesian vocational school

10.11591/ijere.v9i1.20390
Agung Panji Sasmito , Djoko Kustono , Purnomo Purnomo , Hakkun Elmunsyah
Indonesia faces vocational teachers’ shortage both in the quantity and quality. One of Indonesian goverments’ effortsto overcome that problem is holding a Dual Expertise Program (DEP) to produce dual expertise teachers for vocational schools. However, the quality of dual expertise vocational teacher is still questionable. The purpose of this article is to give an idea related to the conceptual model framework for improving the quality of vocational teachers demonstrated by the teachers’ achievements. The authors of this article discuss factors that have an impact on the quality of vocational teachers and describe a framework based on a literature review that might contribute to improving the quality of vocational teachers, especially dual expertise vocational teachers. Based on the results of the article found that to improve the quality of vocational teacher can be improved through increasing self-efficacy and transferable skills, in addition to pay attention to teacher’s initial expertise and teaching experience.
Volume: 9
Issue: 1
Page: 39-44
Publish at: 2020-03-01
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