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30,547 Article Results

Grid Interconnection of PV System Using Symmetric and Asymmetric MLI Topology

10.11591/ijpeds.v9.i4.pp1616-1623
V S Prasadarao K , V Joshi Manohar
Generally, PV cell converts sunlight into electricity in the form of dc. Integration of PV system with the existing grid requires dc-ac conversion. This conversion is possible with the help of a dc-ac converter known as an inverter. Among all types of the inverter, multilevel inverters (MLIs) are playing a major role with all their major privileges like High power quality, low distortion, less blocking voltages for switching devices. Conventional multilevel inverter topologies such as diode clamped, flying capacitor and cascaded MLIs are having so many disadvantages. One of the common disadvantage among all the conventional MLIs is the requirement of more number of power electronic components as the level of the output voltage increase. To reduce the power electronic components this paper proposes a multilevel inverter topology in symmetrical and asymmetrical configuration. The proposed MLI uses 12 switches and 19 diodes which are very less compared to conventional MLI topologies for generates nine and thirteen level output voltages. Comparison between presented MLI topology and conventional MLI topologies is presented in this paper. Finally, the proposed MLI whose input is fed from the PV system is integrated into the grid. The proposed concept is validated by using the MATLAB/SIMULINK software and the appropriate results are presented in this paper.
Volume: 9
Issue: 4
Page: 1616-1623
Publish at: 2018-12-01

Five-Level Single Source Voltage Converter Controlled Using Selective Harmonic Elimination

10.11591/ijeecs.v12.i3.pp924-932
Ibrahim Haruna Shanono , Nor Rul Hasma Abdullah , Aisha Muhammad
The paper presents a 5-level cascaded H-bridge voltage source inverter. The converter topology composed of two-cascaded H-bridge modules connected in parallel and powered by a single DC source. The benefit of this topology in comparison with the conventional H-Bridge configuration is that it uses single input DC source instead of two to achieve the same output steps/levels. Selective Harmonic Elimination (SHE) is the modulation technique employed. The generated non-linear transcendental equations are solved using an optimised Genetic algorithms to find the switching angles. This property makes the topology and the control function suitable for three phase applications where triplen harmonics are said to cancel out at the line-to-line voltages. This concept of SHE modulation extends the value of the filter cut-off frequency, which translates to smaller sized filter, compact cooling system and reduced system weight. This advantage makes the topology attractive to automotive and renewable energy applications. The topology was simulated using PSIM software.
Volume: 12
Issue: 3
Page: 924-932
Publish at: 2018-12-01

Does Emotional Intelligence Affect Social Adjustment Ability among Primary School Students?

10.11591/ijere.v7i4.14272
Suyatno Suyatno , Khairil Nur Hidayat
The aim of this research was to find out the impact of emotional intelligence to the social adjustment ability of the primary students in Muhammadiyah Karangwaru Yogyakarta Elementary School. The population involved in this research is all of the 5th grade students of Muhammadiyah Karangwaru Yogyakarta, who are 80 students. The sampling technique used here was Sampling Jenuh which then resulted 54 students as the samples of the research. The writer used questionnaire in collecting the data of the research. The approach used in the research was expost facto quantitative. Meanwhile in analyzing the data, the writer used simple regression test and test requirement. The result of the reserach shows that there is a positive and significant impact of emotional intelligence towards the social adjustment ability of the students. The acceptance hypothesis is showed through regression anlysis of Fcal which is 21.495 with significancy is 0.000. It can be defined that the ability of the students’ social adjustment can be improved through the improvement of their emotional intelligence. Based on the research result, this research suggests that it would be better if the learning process in the school gives more focus on the emotional intelligence formation which can affect to the development of social adjustment ability of the students. It is because the social adjustment ability constitutes a predictor of someone’s successful life in the future.
Volume: 7
Issue: 4
Page: 270-278
Publish at: 2018-12-01

A Single Switch Parallel Quasi Resonant Converter Topology for Induction Heating Application

10.11591/ijpeds.v9.i4.pp1718-1724
V. Geetha , V. Sivachidambaranathan
In this paper 32 KHZ Single phase Single switch Parallel Resonant converter topology (SSPR) using power MOSFET is simulated using MATLAB simulink for the different duty cycle and the THD, Power with respect to change in duty cycle is compared . The workingcoil is the combination of R, L in parallel with C which produces the output power of 1.7KW to 3KW with variation in duty cycle at higher value in duty cycle we get less THD and more power. The operating frequency is selected nearer to the resonant frequency for the improvement performance. The experimental set up of this SSPR Inverter in the induction heating application for the domestic purpose is implemented is depicted and this validates the implementation of quasi resonant using IGBT for domestic applications.
Volume: 9
Issue: 4
Page: 1718-1724
Publish at: 2018-12-01

Single Phase Power Generation System from Fuel Cell

10.11591/ijpeds.v9.i4.pp1676-1684
Nageswara Rao Kudithi , Sakda Somkun
Power conditioning circuits are required for the fuel cell systems due to its nature in energetic state. This paper proposed the small signal average modelling of a duel active bridge (DAB) DC-DC converter with LC filter, to generate the single phase AC power by using the H1000 fuel cell system. The controller is designed for the stable operation of the system. Implemented the controller, which gives the constant output voltage to DC-bus from the DAB DC-DC converter, this DC-bus voltage fed to the inverter, which inverts the DC-bus voltage to single Phase AC power with the LC-filter. The proposed system simulated in the MATLAB/Simulink.
Volume: 9
Issue: 4
Page: 1676-1684
Publish at: 2018-12-01

Negative Total Float to Improve a Multi-Objective Integer Non-Linear Programming for Project Scheduling Compression

10.11591/ijece.v8i6.pp5292-5302
Fachrurrazi Fachrurrazi , Abdullah Abdullah , Yuwaldi Away , Teuku Budi Aulia
This paper presents Multi-Objective Integer Non-Linear Programming (MOINLP) involving Negative Total Float (NTF) for improving the basic model of Multi-Objective Programming (MOP) in case the optimization of the additional cost for Project Scheduling Compression (PSC). Using the basic MOP to solve the more complex problems is a challenging task. We suspect that Negative Total Float (NTF) having an indication to make the basic MOP to solve the more general case, both simple and complex of PSC. The purpose of this research is identifying the conflicting objectives in PSC problem using NTF and improving MOINLP by involving the NTF parameter to solve the PSC problem. The Solver Application, which is an add-in of MS Excel, is used to perform optimization process to the model developed. The results show that NTF has an important role to identify the conflicting objectives in PSC. We define NTF is an automatic maximum value of the activity duration reduction to achieve due date of PSC. Furthermore, the use of NTF as a constraint in MOINLP can solve the more general case for both simple and complex PSC problem. Base on the condition, we state that the basic MOP is still significant to solve the PSC complex problems using MOINLP as a sophisticated MOP technique.
Volume: 8
Issue: 6
Page: 5292-5302
Publish at: 2018-12-01

Design and Development of Grid-connected Quasi-Z-Source PV Inverter

10.11591/ijpeds.v9.i4.pp1989-2005
Zulhani Rasin , Muhammed Fazlur Rahman , Maaspaliza Azri , Md Hairul Nizam Talib , Auzani Jidin
An inverter system applied with the PV source typically has a problem of lower input voltage due to constraint in the PV strings connection. As a countermeasure a DC-DC boost converter is placed in between to achieve a higher voltage at the inverter DC link for connection to the grid and to realize the MPPT operation. This additional stage contributes to losses and complexity in control thus reducing the overall system efficiency. This work discussed on the design and development of a grid-connected quasi-Z-source PV inverter which has different topology and control method compared to the conventional voltage source inverter and able to overcome the above disadvantages. Modelling and performance analysis of the voltage and current controller to achieve a good power transfer from the PV source, as well sycnchronization with the grid are presented in detail. Results from both simulation and experimental verification demonstrate the designed and developed grid-connected qZSI PV inverter works successfully equivalent to the conventional voltage source inverter system.
Volume: 9
Issue: 4
Page: 1989-2005
Publish at: 2018-12-01

The Effects of Pre-service Teachers’ Cognitive Styles on Learning Approaches

10.11591/ijere.v7i4.15737
Sedat Altıntaş , İzzet Görgen
The main purpose of the study is to investigate the effects of prospective teachers’ cognitive styles on learning approaches. It is aimed to define whether exist significance differences between defining prospective teachers’ cognitive styles and learning approaches and demographic variables within the scope of the mean purpose. The study, designed according to correlational survey model, was conducted at Mugla Sitki Kocman University, Faculty of Education in the 2014-2015 academic year spring semester. As data collection instruments, “The Group Embedded Figures Test” was administered to define prospective teachers’ cognitive style in the study. On the other hand “The Revised Two Factor Study Process Questionnaire” was used to reveal prospective teachers’ learning approaches. According to the findings, prospective teachers generally have field dependent cognitive style. It is determined that between with prospective teachers’ gender and academic success and cognitive style scores there isn’t any significant difference revealed. However, there is significant difference between branches and cognitive style scores. It has been viewed that prospective teachers prefer deep learning approach generally. There isn’t significant difference between gender and learning approaches yet there is significant difference between learning approaches-branches and academic success. It is also concluded that as prospective teachers’ cognitive styles approaches to field independent, deep learning approach preference of prospective teachers has diminished.
Volume: 7
Issue: 4
Page: 285-293
Publish at: 2018-12-01

Using the Five-Level NPC Inverter to Improve the FOC Control of the Asynchronous Machine

10.11591/ijpeds.v9.i4.pp1457-1466
Mouna Es-Saadi , Mohamed Khafallah , Hamid Chaikhy
Many researches have been dedicated to develop the induction motor drive control strategy used on the railway traction applications. In this paper we propose to investigate and to improve the electric locomotives by using a Field Oriented Control (FOC) strategy of induction motor drive. This induction motor can be powered by a five-stage neutral point inverter controlled by sinusoidal pulse width modulation (SPWM) due to good quality for output voltage and The use of fast switches. Both conventional and improved locomotives are simulated in Matlab/Simulink and compared in open loop conditions   and closed loop conditions using IP controller, in term of torque response, current harmonic distortions and rotor speed response.
Volume: 9
Issue: 4
Page: 1457-1466
Publish at: 2018-12-01

Modeling and Simulation of 127 Level Optimal Multilevel Inverter with Lower Number of Switches and Minimum THD

10.11591/ijpeds.v9.i4.pp1765-1773
Bolla Madhusudana Reddy , Y. V. Siva Reddy , M. Vijaya Kumar
This paper proposes a new optimal high level multilevel inverter with minimum number of components. This multi level inverter (MLI) is designed with series combination of basic units which can generate positive levels at output. DC source values applied for each basic unit is different with another. An H bridge is connected across proposed MLI for generating negative levels along with positive levels at output and that inverter considered as proposed high level optimal multilevel inverter. Single unit is responsible producing 21 levels. Therefore six units are connected in cascaded form to increase number of levels as 127 at output. Decrease in the number of power switches, driver circuits, and dc voltage sources are the improvement of the proposed MLI. Sinusoidal multiple pulse width modulation (SPWM) technique is implemented to produce pulses for turning ON switches according requirement. Low total harmonic distortion at output voltage or current production is major advantage of proposed module. The validations of proposed MLI results are verified through MATLAB/SIMULINK.
Volume: 9
Issue: 4
Page: 1765-1773
Publish at: 2018-12-01

Performance Investigation of Grid Connected Photovoltaic System Modelling Based on MATLAB Simulation

10.11591/ijece.v8i6.pp4847-4854
Adnan Hussein Ali , Hassan Salman Hamad , Ali Abdulwahhab Abdulrazzaq
Photovoltaic (PV) systems are normally modeled by employing accurate equations dealing with a behavior the PV system. This model has Characteristic of PV array cells, which are influenced by both irradiation and temperature variations. Grid-connected PV system is considered as electricity generated solar cell system which is connected to the grid utilities. This paper characterizes an exhibiting and simulating of PV system that executed with MATLAB /Simulink. The impact of solar irradiances as well as ambient temperature performances of PV models is investigated and noted that a lower temperature provides maximum power higher so that the open circuit voltage is larger. Furthermore, if the temperature is low, then a considerably short circuit current is low too.
Volume: 8
Issue: 6
Page: 4847-4854
Publish at: 2018-12-01

Wireless Technology for Monitoring Site-specific Landslide in Vietnam

10.11591/ijece.v8i6.pp4448-4455
Gian Quoc-Anh , Nguyen Dinh-Chinh , Tran Duc-Nghia , Tran Duc-Tan , Kieu Nguyen Thi , Kumbesan Sandrasegaran
Climate change has caused an increasing number of landslides, especially in the mountainous provinces of Vietnam, resulting in the destruction of vital transport and other infrastructure. Current monitoring and forecasting systems of the meteorology department cannot deliver accurate and reliable forecasts for weather events and issue timely warnings. This paper describes the development of a simple, low cost, and efficient system for monitoring and warning landslide in real-time. The authors focus on the use of wireless and related technologies in the implementation of a technical solution and some of the problems of the wireless sensor network (WSN) related to power consumption. Promising compressed sensing (CS) based solution for landslide monitoring is discussed and evaluated in the paper.
Volume: 8
Issue: 6
Page: 4448-4455
Publish at: 2018-12-01

An Opportunity for Values Education in Higher Education: Social Responsibility and Healthy Living Course

10.11591/ijere.v7i4.14768
Gökhan Izgar
The purpose of this study is to determine the contribution of the “social responsibility and healthy living” course, which was put into effect at a state university for the first time in Turkey, within the scope of elective courses on students’ acquisition of values. The data in this study, in which action research, one of the qualitative research designs, was conducted, were obtained using the semi-structured interview form prepared by the researcher. The data obtained were analyzed using the descriptive analysis and content analysis techniques, which are qualitative data analysis methods. 39 students participated in the study on a voluntary basis. As a result of the analysis of the data, it was concluded that the action plan developed within the scope of the social responsibility and healthy living course was effective in the acquisition of values of taking responsibility, charitableness, being useful, ethics, empathy, importance of the institution of family, cooperation-solidarity, patience, gratitude (thankfulness), freedom of thought and respect for differences. Likewise, some of the students stated that this course contributed to their views and behaviors concerning healthy living. However, a considerable number of students were of the opinion that either the course did not make a contribution or made a partial contribution. In addition, the students pointed out that the way the course was taught was fruitful and practice-based,, that it was fun and informative and that the projects and readings contributed to learning. Yet, there were also negative student views about the course content and the method of teaching employed. Moreover, it was important that a theme emerged indicating that class hours were not sufficient.
Volume: 7
Issue: 4
Page: 331-340
Publish at: 2018-12-01

Design of Maximum Power Point Tracking for Solar Collector Drying System: An Experimental Study

10.11591/ijpeds.v9.i4.pp1799-1803
Saifuddin M. Jalil , Faizar Abdurrahman , Selamat Meliala , Rosdiana Rosdiana
This research describes the performance of maximum power point tracking as a solar collector of PV system integration for agriculture product drying system. The system comprises of solar collector, tracking PV array, the battery bank, the micro controller and the DC converter. This system is design to enhance the work of solar collector in drying process.. This design is hoped to be an appropriate system in order to ensure the maximum result by providing solar radiation energy. This paper shows the experiment data of the voltage and power response in positioning the PV to yield a maximum photovoltaic array output power of solar drying system device.
Volume: 9
Issue: 4
Page: 1799-1803
Publish at: 2018-12-01

Outdoor Performance Evaluation of Building Integrated Photovoltaic Thermal (BIPVT) Solar Collector with Spiral Flow Absorber Configurations

10.11591/ijpeds.v9.i4.pp1918-1925
Adnan Ibrahim , Sohif Mat , Ahmad Fazlizan Abdullah , Ahmad Fudholi , Kamaruzzaman Sopian
Building Integrated Photovoltaic thermal solar collector (BIPVT) with Spiral flow absorber design is a collector not only used to generate electricity and thermal energy simultaneously but also can be integrated with the roof. Due to it characteristic as a roof, the collector is exposed to the direct sunlight resulting from a higher temperature on it surfaces. The temperature increased will simultaneously decrease it efficiency. An experiment has been conducted outdoor at Universiti Kebangsaan Malaysia to examine and evaluate the efficiency of the collector. Data for the experiment has been collected and gathered from 08:00 to 17:00 respectively. Results from the experiment recorded the best total efficiency of 65.10% (53.64% thermal efficiency and 11.46% electrical efficiency from the PV panel) at mass flow rate of 0.041kg/s and solar radiation of 1148W/m2. The effect of mass flow rates on open circuit voltage (Voc) and the modules short circuit current (Isc) are also presented.
Volume: 9
Issue: 4
Page: 1918-1925
Publish at: 2018-12-01
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