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28,812 Article Results

Design of an Improved MPPT Control of DFIG Wind Turbine under Unbalanced Grid Voltage using a Flux Sliding Mode Observer

10.11591/ijpeds.v8.i4.pp1723-1731
Youssef Majdoub , Ahmed Abbou , Mohamed Akherraz , Rachid El Akhrif
This study presents a control scheme of the electronic interface of a grid connected Variable Speed Wind Energy Generation System (VS-WEGS) based on a Doubly Fed Induction Generator (DFIG). The efficiency of the wind energy is represented to according to the control strategy applied. Thus, in the case of unbalanced grid voltage, the negative sequence voltage causes additional strong oscillation at twice the grid frequency in the stator instantaneous active and reactive powers. The objective of this work is to present an enhanced MPPT controller uses backstepping approach implemented in both  and   reference frames rotating to keep a safe operation of DFIG during unbalanced grid voltage associated with regulating rotor flux, in order to estimate rotor flux, a nonlinear observer based on sliding mode is proposed in this work. Note that the conventional controllers (PI, PI-R …) are not provided satisfactory performance during unbalanced voltage dips. The validation of results has been performed through simulation studies on a 4 kW DFIG using Matlab/Simulink®.
Volume: 8
Issue: 4
Page: 1723-1731
Publish at: 2017-12-01

Digital Control for a PV Powered BLDC Motor

10.11591/ijpeds.v8.i4.pp1714-1722
Slamet Riyadi
Stand-alone applications of Photovoltaic (PV) can be found in water pumping systems for rural area. The proper electric motor must be chosen for optimal considerations. One of the modern electric motor called brushless motor (BLDC) can be an alternative for this application although it has complexity in control. Powering such a motor by using electric energy generating by PV modules will be an interesting problem. In this paper, a PV powered BLDC motor system is proposed. The PV modules must produce maximum power at any instant time and then this power must be able to rotate the motor. By combining sequential stator energizing due to a rotor detection and a PWM concept, the speed of BLDC can be controlled. Meanwhile, to get maximum power of PV modules, detection of voltage and current of the modules are required to be calculated. Digital Signal Control (DSC) is implemented to handle this control strategy and locks the width of the PWM signal to maintain the PV modules under maximum power operation. The effectiveness of the proposed system has been verified by simulation works. Finally the experimental works were done to validate.
Volume: 8
Issue: 4
Page: 1714-1722
Publish at: 2017-12-01

Performance Analysis of FPGA based Diode Clamped Multilevel Inverter Fed Induction Motor Drive using Phase Opposition Disposition Multicarrier Based Modulation Strategy

10.11591/ijpeds.v8.i4.pp1512-1523
Nunsavath Susheela , Satish Kumar
Multilevel inverters (MLI) are becoming more popular over the years for medium and high power applications because of its significant merits over two level inverters. This paper presents an implementation of multicarrier based sinusoidal pulse width modulation technique for three phase seven level diode clamped multilevel inverter.  This topology is operated under phase opposition disposition pulse width modulation technique. The performance of three phase seven level diode clamped inverter is analyzed for induction motor (IM) load.  Simulation is performed using MATLAB/SIMULINK. Experimental results are presented to validate the effectiveness of the operation of the diode clamped multilevel inverter using field programmable gate array.
Volume: 8
Issue: 4
Page: 1512-1523
Publish at: 2017-12-01

Factors Associated with Motorcycle Risk Behavior among Thai University Students, Khon Kaen

10.11591/ijere.v6i4.9419
Yudha Puratmaja , Lina Handayani , Kartika Setyaningsih Sunardi
The aim of this research was to assess motorcycle risk behavior (MRB) among Thai students in Khon Kaen University. The research used a cross sectional study. Fifty Thai students recruited using purposive sample technique and the chi-square test was used to analyze relationship between characteristic associated with MRB. The most common MRB were making U-turn (38%), sometimes driving above the speed limit (36%), driving with more than two passanger (48%) and sometimes not wearing helmet (36%). The result showed that sex and riding history associated with MRB (Psex < 0.05; Priding history < 0.05). Sex and riding history were significantly associated with MRB. Improving knowledge is important to decrease risky motorcycle driving behavior. Additionally, the need to provide intervention programs, promotion, and awareness related to student’s safety riding behavior could be recommended, from this information.
Volume: 6
Issue: 4
Page: 270-276
Publish at: 2017-12-01

Transformer Exchanging with Vacuum Electrical Switch

10.11591/ijeecs.v8.i3.pp679-680
Anu Priya. K.R , Sasilatha T
This paper presents investigation of conceivable transient overvoltage that can be produced amid vacuum electrical switch (VCB) operation at the association purpose of a photovoltaic power plant. Average exchanging occasion that is identified with VCB concerns stimulation and de-empowerment of emptied transformer. Nonetheless, at the common photovoltaic power plant the transformer is sustained by an inverter outfitted with LC (or LCL) channels that are important for constraint of music and swell in voltage and current. From the perspective of exchanging operations, the inductance and capacitance of the LV side associated channel influence the regular recurrence of the transformer, which is reflected by various transient framework reaction amid VCB working. In this article, research facility estimation of overvoltage produced amid dispersion transformer exchanging by methods for VCB is examined. Effect of the LC channel associated at the LV side on the overvoltage concealment was contemplated. EMTP-ATP recreations were directed with a specific end goal to confirm the likelihood of homeless people end by methods for extra arrangement associated RL gag at the transformer medium voltage side.
Volume: 8
Issue: 3
Page: 679-680
Publish at: 2017-12-01

A Conceptual Framework Curriculum Evaluation Electrical Engineering Education

10.11591/ijere.v6i4.7624
Nurulita Imansari , Eddy Sutadji
This evaluation is a conceptual framework that has been analyzed in the hope that can help research related an evaluation of the curriculum. The Model of evaluation used was CIPPO model. CIPPO Model consists of context, input, process, product, and outcomes. On the dimension of the context includes the vision and mission of the study program, the purpose of the study program. On the input, dimension consists of learning achievements, curriculum structure, qualified lecturer, and course outline. On the dimensions of the process consists of academic activities, implementation of industry practice, PPL and KKN, facilities and infrastructure, learning strategies, resources and learning media and also learning evaluation. On the product, dimension consists of the value of the GPA and dimension outcomes consist of skills match the needs of the working world.
Volume: 6
Issue: 4
Page: 265-269
Publish at: 2017-12-01

Proportional Integral Estimator of the Stator Resistance for Direct Torque Control Induction Motor Drive

10.11591/ijpeds.v8.i4.pp1631-1641
Jagdish Gangadharrao Chaudhari , Sanjay Bhauraoji Bodkhe , Mohan V. Aware
In this paper, an improved proportional integral stator resistance estimation for a direct torque controlled induction motor is proposed. This estimation method is based on an on-line stator resistance correction regarding the variations of the stator current estimation error. In fact, the input variable of the PI estimator is the stator current estimation error. The main idea is to tune accurately the stator resistance value relatively to the evolution of the stator current estimation error gradient to avoid the drive instability and ensure the tracking of the actual value of the stator resistance. But there is an unavoidable steady state error between the filtered stator current modulus and its estimated value from the dq model of the machine which is due to pseudo random commutations of the inverter switches. An offset has been introduced in order to overcome this problem, for different speed command values and load torques. Simulation results show that the proposed estimator was able to successfully track the actual value of the stator resistance for different operating conditions
Volume: 8
Issue: 4
Page: 1631-1641
Publish at: 2017-12-01

Using Chemistry Teaching Aids Based Local Wisdom as an Alternative Media for Chemistry Teaching and Learning

10.11591/ijere.v6i4.10772
Erfan Priyambodo , Safira Wulaningrum
Students have difficulties in relating the chemistry phenomena they learned and the life around them. It is necessary to have teaching aids which can help them to relate between chemistry with the phenomena occurred in everyday life, which is chemistry’s teaching aids based on local wisdom. There are 3 teaching aids which used in chemistry teaching and learning, i.e. clay molymod, electrolyte tester, electroplating tool. The chemistry teaching aids was reviewed by media experts, material experts, and also reviewers. The reviewers’ assessment showed that all of the teaching aids have a very good quality. Based on the response from Senior High School’ students, they all agree that the teaching learning process using the teaching aids could improve their learning motivations.
Volume: 6
Issue: 4
Page: 295-298
Publish at: 2017-12-01

Thermal Modelling for Permanent Magnet Synchronous Machine (PMSM)

10.11591/ijpeds.v8.i4.pp1903-1912
R. Aziz , G. J. Atkinson , S. Salimin
It is important to predict the temperature in some of the essential parts in machine design to prevent the machine from any damage. Most researchers usually not given much attention on thermal analysis during machine design as much as the electromagnet design. Therefore, in this study, two types of thermal modelling were proposed to predict the temperature of a permanent magnet synchronous machine (PMSM). Infolytica ThermNet software has been used since the software is related to Infolytica Magnet and the losses obtained from the electromagnetic field analysis are used as the heat source in the thermal analysis. Comparison has been done between the predicted temperature from lumped parameter model and finite element analysis. The results also will be validated by using experimental setup. Since Infolytica Magnet has been used to analyse the electromagnetic output therefore finite element analysis model is the better choice.
Volume: 8
Issue: 4
Page: 1903-1912
Publish at: 2017-12-01

Comparative Study of Three Different Topologies of Five-Level Inverter with SPWM Modulation Technique

10.11591/ijpeds.v8.i4.pp1612-1621
Nabil Farah , Jurifa Bt. Mat Lazi , MHN Talib
Multilevel Inverter (MLI) has attracted a great attention by different researchers and industries due to its capability in handling high power application and minimizing the harmonics contents in the output. This study propose three different topologies of MLI (5-level) which are Cascaded H-Bridge Multilevel Inverter (CHMLI) ,Diode Clamped Multilevel Inverter and Flying Capacitor Multilevel Inverter (FCMLI) .These three topologies have been modelled in MATLAB/SIMULINK and compared in terms of THD and number of components used. Sinusoidal Pulse Width Modulation is utilized to control both of the topologies with same DC source. The results showed that ,CHMLI is superior compared to DCMLI and FCMLI in which the CHMLI produce 26.29% THD while DCMLI and FCMLI produce 29.14% and 33.53% respectively .Moreover less components and switching losses is obtained when using the CHMLI.
Volume: 8
Issue: 4
Page: 1612-1621
Publish at: 2017-12-01

Analysis of Virtual positions Management development Supporting Technology for initial Results of the Semester of Code

10.11591/ijeecs.v8.i3.pp642-644
Vimal Kumar Stephen. K , V. Mathivanan
This paper clarifies the Virtual Alliances for Learning Society (VALS) Project technological method to deal with bolster a virtual positions management development. Likewise, this paper demonstrates the first results of the viable piece of the venture, the Semester of Code, clarifying the recognized issues, the issues, the difficulties and a few activities to enhance the advancement of this sort of virtual positions programs. With a specific end goal to enable the readers to better understand the approach and its outcomes, the composition likewise portrays three of the principle virtual positions programs far and wide, in regards to both their association and innovative approach.
Volume: 8
Issue: 3
Page: 642-644
Publish at: 2017-12-01

Effectiveness Leadership of Principal

10.11591/ijere.v6i4.10774
Rudolf Kempa , Marthen Ulorlo , Izaak Hendrik Wenno
Effective principal leadership is a leadership that can foster cooperative efforts and maintain an ideal working climate in schools. The purpose of this research is to know the effectiveness leadership of the principal of the 2nd State Junior High School of Ambon, with qualitative approach. Data sources include school principals, vice principals, heads of administration, heads of affairs, library coordinators, teacher subject coordinators, counselors coordinators, and school supervisors. Data collection techniques through Focus Group Discussion, Interview, Observation, and documentation study. The analysis technique used is descriptive narrative. The results concluded that the leadership style of principal in the 2nd State Junior High School of Ambon has not been effective.
Volume: 6
Issue: 4
Page: 306-311
Publish at: 2017-12-01

On the Design of a 4 Degrees-of-freedom Pick and Place Cable Suspended Parallel Manipulator

10.11591/ijra.v6i4.pp286-302
F. J. Castillo-Garcia , P. Rea , A. Gonzalez-Rodriguez , E. Ottaviano
This paper proposes the design and control strategy for a four degrees-of-freedom spatial cable-suspended parallel robot for pick and place operations. Pick and place is a repetitive task requiring payload changes for the movement to pick-up the object, and the movement to the nal pose to release the manipulated object. In this paper, a new robust control strategy has been proposed, together with proper trajectories for the required operation. The control strategy consists on the system decoupling and linearization by means of a feedforward term and a cascade PD controller. The main advantage of the proposed solution is that its design can be scalable in size spanning from centimeters to meters with a relatively good positioning accuracy. Finally, simulations are reported to show the overall performances of the proposed con guration for pick and place operations with a medium size manipulator.
Volume: 6
Issue: 4
Page: 286-302
Publish at: 2017-12-01

Improving Transient Stability in Power Systems by Using Fuzzy Logic Controlled SVC

10.11591/ijra.v6i4.pp227-233
Reaza Ashrafi Habib Abadi , Amir Nekoubin
This paper presents the capability of a fuzzy logic based stabilizer used for generating the supplementary control signal to voltage regulator of static VAR compensator (SVC) for improving damping oscillations in power systems. Generator speed deviation and line active power were chosen as input signals for the fuzzy logic controller (FLC). The quantity of reactive power supplied/absorbed by SVC is determined based on the two input signal and deviation of terminal voltage at each sampling time. The effectiveness and feasibility of the proposed control is demonstrated with Single Machine Infinite Bus (SMIB) system and multi machine system which show improvement over the use of a fixed parameter controller. It has been observed that a robust controller is obtained with fuzzy logic controller.
Volume: 6
Issue: 4
Page: 227-233
Publish at: 2017-12-01

The Effects of Students’ Motivational Factors on their Attitudes toward Mathematics

10.11591/ijere.v6i4.10770
Samson Oyelola Oyedeji
Mathematics is the only subject that cut across all sciences; hence the need for students’ positive attitudes toward mathematics cannot be under-estimated. Students’ motivation has been found to be having a positive relationship with the students’ attitudes toward mathematics. The aim of the study was to use path analysis to investigate the type of direct effects the motivational factors have on the students’ attitudes toward mathematics. To do this, twelve senior secondary schools were randomly selected from the Edo State South Senatorial District. Thirty students were randomly selected from each of the schools and a total of three hundred and sixty students were used for the study. A self-designed four-likert scale questionnaire titled “Students’ Motivational factors and Attitudes toward mathematics” was used to gather information from the subjects. Pearson Moment correlation and Regression analysis were used to analyse the data obtained from the questionnaire. The findings of the study revealed that intrinsic, home environment and teacher factors have positive direct effects on the students’ attitudes toward mathematics with intrinsic factor having the strongest and the most significant effect on students’ attitudes toward mathematics. The findings also revealed that peer group factor and school environment factor have negative effects on students’ attitudes toward mathematics. It was also discovered that all the motivational factors have positive and significant relationship with each other except intrinsic and school environment factors that have negative relationship with each other.
Volume: 6
Issue: 4
Page: 277-287
Publish at: 2017-12-01
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