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29,734 Article Results

Performance evaluation of standalone double axis solar tracking system with ‎maximum light detection MLD for telecommunication towers in Malaysia

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/14327
Ahmed Mohamed Abdulmula , Kamaruzzaman Sopian , Lim Chin Haw , Ahmad Fazlizan
This paper is performed to investigate the performance of ‎dual-axis solar tracking system with maximum light detection for off-grid telecommunication towers under weather conditions in Malaysia. The studied system consists of High-efficiency heterojunction intrinsic thin (HIT) film solar modules ‎coupled with state-of-the-art dual-axis maximum light detection (MLD) solar ‎tracking system. The ‎investigation method is based on the analyzed the daily actual data record for both the average power output of ‎the photovoltaic system and the ‎state of charge of batteries in four months ‎under different weather conditions as a function of time. Based on the results obtained ‎the use of HIT solar modules with MLD dual ‎axis solar tracking system has high performance effective under ‎Malaysian weather.‎ The study also presented the detailed investigated system description.
Volume: 10
Issue: 1
Page: 444-453
Publish at: 2019-03-01

Design PV system for a small GEO satellite and studying the effect of using different types of propulsion

10.11591/ijaas.v8.i1.pp54-63
A. Lotfy , W. Anis , Joseph V. M. Halim
This paper presents an optimum design of the solar Photo-Voltaic (PV) power system for small Geostationary Earth Orbit (GEO) satellites using triple junction solar cells and advanced Lithium Ion batteries. The paper applies the proposed system on various propulsion technologies; full chemical, full electrical and hybrid propulsions. This research work studies the capability to fulfil efficiently all the satellite power requirements during both the launching and the on-station phases while reducing the high cost challenge. Since the propulsion type is a key factor for the satellite cost, an economic analysis is demonstrated and investigated in two different strategies. The first scenario fixes the satellite weight and offers the revenue due to the increase in the satellite payload. However, the second scenario evaluates the saving profits due to the reduction in the satellite weight using the same number of satellite transponders. The analytical comparison among the different propulsion techniques shows the superior advantages of using the full electrical satellites.   
Volume: 8
Issue: 1
Page: 54-63
Publish at: 2019-03-01

Transient and steady-state analysis of single switched capacitor converter

10.11591/ijpeds.v10.i1.pp342-350
Alexander Kushnerov
The paper derives closed form expressions for transient and steady-state operation of a DC-DC converter with single switched capacitor. To this end, the result of each switching is considered as a point in the iterative process, and the function between the points is reconstructed. As opposed to the commonly accepted approach, when each of the topologies is approximated by a first order circuit, the proposed analysis is carried out for second order circuits. This allows obtaining the waveform of output voltage ripple and paves the way to more accurate calculation of equivalent resistance. The obtained analytical expressions were verified by simulations and an excellent agreement between the results was found.
Volume: 10
Issue: 1
Page: 342-350
Publish at: 2019-03-01

Machining time and number of machine for the production planning of wheel nut releaser with the demand of 100 units/day

10.11591/ijaas.v8.i1.pp8-13
Nanang Qosim , Mohammad Hartono
The impact of competition in the industry has driven people to improve the effectiveness of production process. One of the main factors supporting that effectiveness is the good planning of both the need and the number of machines. The aim of this study is to estimate the machining times to determine the number of machines to manufacture 100/day of the nut releaser tool for car wheel. The result shows that the need of the number of machines to manufacture each component of the nut releaser tool for car wheel are 7 units of power hacksaw, 27 units of lathe machine, 8 units of drilling machine, 12 units of milling machine, 2 units of EDM machine and 25 units of bench work.
Volume: 8
Issue: 1
Page: 8-13
Publish at: 2019-03-01

The design of auto-tuning capacitive power transfer for rotary applications using phased-locked-loop

10.11591/ijpeds.v10.i1.pp307-318
N. Nabila , Shakir Saat , Y. Yusop , M.S. M Isa , A.A. Basari
Wireless power transfer (WPT), through the transmission of contactless energy, is not only being used for charging batteries in smartphones, but it is also being increasingly used in the field of industrial applications. The capacitive based approach is utilized in this paper because of its ability to transmit power in a metal surrounding environment where the inductive-based approach failed to perform. This work focuses on the coupling study of a rotary CPT application where the power supply is stationary while the load rotates and therefore allows the load to rotate 360o free rotation. The Class E MOSFET power inverter is used here due to its ability to achieve high efficiency compared to other class of converters at high frequency. The prototype of the CPT for rotary application has also been successfully developed with disk plate thickness of 1mm-2mm. Overall, the developed CPT system for rotary application is able to deliver 5.5Watt with 83.33% efficiency. To enhance the power efficiency and ZVS conditions, a self-tuning circuit using phased-locked-loop has been proposed in this paper. The efficiency of the developed system with self-tuning circuit is increased to 97.%.
Volume: 10
Issue: 1
Page: 307-318
Publish at: 2019-03-01

Snake species identification by using natural language processing

10.11591/ijeecs.v13.i3.pp999-1006
Nur Liyana Izzati Rusli , Amiza Amir , Nik Adilah Hanin Zahri , R. Badlishah Ahmad
The paper presents the snake species identification by using natural language processing. It aims to help medical professionals in predicting the snake species for snake-bite treatments based on the patient’s description of the snake. The decision in suitable anti-venom critically depends on the type of snake species. Wrong anti-venom may result in severe morbidity and mortality. This research investigates the human perception and the selection of words in describing a snake based on their visual view. The descriptions were presented in unstructured text, and the NLP processing involves pre-processing, feature extraction and classification. Four machine learning algorithms (naïve Bayes, k-Nearest Neighbour, Support Vector Machine, and Decision Trees J48) were used during training and classification. Our results show that J48 algorithm obtained the highest classification accuracy of 71.6% correct prediction for the NLP-Snake data set with high precision and recall.
Volume: 13
Issue: 3
Page: 999-1006
Publish at: 2019-03-01

Critical evaluation of soft computing methods for maximum power point tracking algorithms of photovoltaic systems

10.11591/ijpeds.v10.i1.pp548-561
Norazlan Hashim , Zainal Salam
With the proliferation of numerous soft computing (SC)–based maximum power point tracking (MPPT) algorithms for photovoltaic (PV) systems, determining which algorithm performs better than others is becoming increasingly difficult. This is primarily due to the absence of standardized methods to benchmark their performances using consistent and systematic procedures. Moreover, the module technology, power ratings, and environmental conditions reported by numerous publications all differ. Based on these concerns, this paper presents a critical evaluation of the five most important and recent SC-based MPPTs, namely, genetic algorithm (GA), cuckoo search (CS), particle swarm optimization (PSO), differential evolution (DE), and evolutionary programming (EP). To perform a fair comparison, the initialization, selection, and stopping criteria for all methods are fixed in similar conditions. Thus, the performance is determined by its respective reproduction process. Simulation tests are performed using the MATLAB/SIMULINK environment. The performance of each algorithm is compared and evaluated based on its speed of convergence, accuracy, complexity, and success rate. The results indicate that EP appears to be the most promising and encouraging SC algorithm to be used in MPPT for a PV system under the multimodal partial shading condition.
Volume: 10
Issue: 1
Page: 548-561
Publish at: 2019-03-01

4-level capacitor-clamped boost converter with hard-switching and soft-switching implementations

10.11591/ijpeds.v10.i1.pp288-299
A.N. Kasiran , Asmarashid Ponniran , A.A. Bakar , M.H. Yatim
This paper presents parameters analysis of 4-level capacitor-clamped boost converter with hard-switching and soft-switching implementation. Principally, by considering the selected circuit structure of the 4-level capacitor-clamped boost converter and appropriate pulse width modulation (PWM) switching strategy, the overall converter volume able to be reduced. Specifically, phase-shifted of 120° of each switching signal is applied in the 4-level capacitor-clamped boost converter in order to increase the inductor current ripple frequency, thus the charging and discharging times of the inductor is reduced. Besides, volume of converters is greatly reduced if very high switching frequency is considered. However, it causes increasing of semiconductor losses and consequently the converter efficiency is affected. The results show that the efficiency of 2-level conventional boost converter and 4-level capacitor-clamped boost converter are 98.59% and 97.67%, respectively in hard-switching technique, and 99.31% and 98.15%, respectively in soft-switching technique. Therefore, by applying soft-switching technique, switching loss of the semiconductor devices is greatly minimized although high switching frequency is applied. In this study, passive lossless snubber circuit is selected for the soft-switching implementation in the 4-level capacitor-clamped boost converter. Based on the simulation results, the switching loss is approximately eliminated by applying soft-switching technique compared to the hard-switching technique implementation.
Volume: 10
Issue: 1
Page: 288-299
Publish at: 2019-03-01

Droop control technique for equal power sharing in islanded microgrid

10.11591/ijpeds.v10.i1.pp530-537
A. W. N. Husna , M. A. Roslan , M. H. Mat
This paper presents a droop control technique for equal power sharing in islanded microgrid. In this study, the proposed controller is based on the frequency droop method, is applied to a robust droop controller in parallel connected inverters. The previous robust droop controller deals with voltage droop method. A modification has been formed against this controller by adding a fuzzy logic controller with the frequency droop method. The only sharing error which is concentrated in this paper is the error in sharing the rated frequency among the inverters. By adapting fuzzy in the robust droop, it tries to eliminate the frequency error, hence that the frequency reference of the inverters keeps maintain at 50Hz. A derivation of generalized models of a single-phase parallel-connected inverter system is shown. The simulation results show that the proposed controller with FLC is able to improve the stability of frequency reference and the performance of power sharing between the inverters under the inductive line impedance.
Volume: 10
Issue: 1
Page: 530-537
Publish at: 2019-03-01

Modelling and design of PID controller for voltage control of AC hybrid micro-grid

10.11591/ijpeds.v10.i1.pp151-159
Ibrahim Alhamrouni , M. A. Hairullah , N. S. Omar , Mohamed Salem , Awang Jusoh , T. Sutikno
The growing demand for power that needs to be remotely transported creates a fast and effective solution of Distributed Energy Resources (DERs) integration. Distributed Energy Resources (DERs) can lessen the electrical and physical distance between load loss and generator, transmission and distribution, and the level of carbon emissions. Such challenges can be overcome by using microgrids, which combine various types of DERs without interrupting the grid operation, allowing the power system to detect and control the errors more efficiently, allowing the shedding load and automatic switching through control algorithms so that blackouts and power restoration times are shortened, enabling either a relevant grid or islanded mode operation, and improving system reliability and flexibility via DERs. This work includes modelling of hybrid AC micro-grid as well as presenting an efficient control technique for micro-grid. In the present work the performance of hybrid AC microgrid system is analyzed in the islanded mode. Photovoltaic system and fuel cell stack are used for the development of microgrid. It also includes microgrid control objectives and the most common problems encountered and their solutions. The employed control technique is able to control the output voltage at a desired and standard value. The control strategies of the hybrid AC microgrid are simulated in MATLAB/SIMULINK.
Volume: 10
Issue: 1
Page: 151-159
Publish at: 2019-03-01

What are the dimensions of thinking skills in Turkish literature: a content analysis study?

10.11591/ijere.v8i1.17215
Yalçın Dilekli
New world needs thinking generation. However, growing thinking generation is very difficult because there are many discrepancies in defining of thinking and thinking skills. Without defining thinking and its dimensions, it is nearly impossible to grow such generation. For having thinking generation, thinking and its dimensions should be described. In the past 20 years, there have been many different definitions with regard to thinking and thinking skills. But, three different approaches for defining thinking skills and needed basic cognitive operations were commonly accepted. Aim of this study whether these three approaches for defining thinking skills were accepted in Turkish literature or not. For this aim, 14 studies, selected from Turkish database, related to thinking skills were analyzed. According the content analysis results, Turkish literature follows these three movements for defining thinking skills except for belonging to specific areas. 
Volume: 8
Issue: 1
Page: 110-118
Publish at: 2019-03-01

An enhanced hybridized artificial bee colony algorithm for optimization problems

10.11591/ijai.v8.i1.pp87-94
Xingwang Huang , Xuewen Zeng , Rui Han , Xu Wang
Artificial bee colony (ABC) algorithm is a popular swarm intelligence based algorithm. Although it has been proven to be competitive to other population-based algorithms, there still exist some problems it cannot solve very well. This paper presents an Enhanced Hybridized Artificial Bee Colony (EHABC) algorithm for optimization problems. The incentive mechanism of EHABC includes enhancing the convergence speed with the information of the global best solution in the onlooker bee phase and enhancing the information exchange between bees by introducing the mutation operator of Genetic Algorithm to ABC in the mutation bee phase. In addition, to enhance the accuracy performance of ABC, the opposition-based learning method is employed to produce the initial population. Experiments are conducted on six standard benchmark functions. The results demonstrate good performance of the enhanced hybridized ABC in solving continuous numerical optimization problems over ABC GABC, HABC and EABC.
Volume: 8
Issue: 1
Page: 87-94
Publish at: 2019-03-01

Performance analysis of DC/DC bidirectional converter with sliding mode and pi controller

10.11591/ijpeds.v10.i1.pp357-365
Chandra Shekher Purohit , Geetha M. , Padmanaban Sanjeevikumar , Pandav Kiran Maroti , Shruti Swami , Vigna K. Ramachandaramurthy
A sliding mode controller for a non-isolated DC/DC, bidirectional converter is presented and comparative study with PI controller is done along with ISE analysis, in order to do performance analysis. The proposed system can be utilized in many applications such as electrical vehicle, distributed power generation or small grids. Second theorem of Lyapunov is utilized and stability of the closed loop system is mathematically proven. The adopted control strategy achieves effective output voltage regulation and good dynamic stability. Rejection of disturbance is also an inherent characteristic of this technique. Furthermore, it is illustrated that the system can successfully follow changes of load demand and compensates sudden disturbances in operating condition. The design is evaluated and verified using Matlab/Simulink. Results of Matlab simulation are provided to show the feasibility of the proposed system and effectiveness of control method. Simulation results show that this technique can provide a considerable edge over control techniques which are presently available (applied) over this type of converter.
Volume: 10
Issue: 1
Page: 357-365
Publish at: 2019-03-01

Cyberbullying among secondary school teachers by parents

10.11591/ijere.v8i1.16549
Rüyam Küçüksüleymanoğlu
Cyberbullying which is known as violence on the Internet is a dimension of peer bullying takes places through electronic communication technologies. Cyberbullying which can occur in any environment regardless of the time and place is the way in which individuals with higher ability to use communication technologies to lead other individuals in a series of negative behaviors over time. With the rapid development of technology and the ease with which internet access becomes easier and cheaper, it becomes a problem that needs to be studied more and more importantly day by day. Facebook, twitter and whatss up, the most widely used social network today, has the potential to become the most commonplace for cyberbullying behaviors. The purpose of this study was to determine cyberbullying towards teachers by parents in secondary schools based on teachers views according to sex, tenure and school size. The sample of the study was 181 teachers from 14 secondary schools. The experiences and perspectives of 181 teachers were assessed regarding the incidence and perceptions of the likelihood of cyber harassment by parents. The results presented here indicate that nearly3/4 of teachers in the sample had received harassing or threatening messages from parents.
Volume: 8
Issue: 1
Page: 151-157
Publish at: 2019-03-01

Implementation of quasi-z source inverter for grid connected PV based charging station of electric vehicle

10.11591/ijpeds.v10.i1.pp366-373
D Sattianadan , K Saravanan , S. Murugan , N. Hari , P. Venkadesh
In recent trends, the use of electric vehicles is taking a sudden hike as they seem to be a much more friendly for the environment as compared to the conventional vehicles that run on combustion engines for a mode of transportation. With the increasing popularity of electric vehicles, the demand on the utility grid is also increasing. To overcome this problem, other alternative sources of energy need to be considered. Photovoltaic energy as the solution is finding its place in the EV charging systems. However, the total amount of energy that can be generated from the PV system is constrained, based on many parameters such as solar radiation, availability of space for Solar power plant development, maintenance of the system, etc. Hence, to maintain the continuity of the system, it needs to be integrated with the grid as well. This offers a smooth charging operation for the electric vehicles. In this paper, a new method is introduced for the integration between the solar inverter system and the utility transmission grid. Quasi-Z-source topology is proposed for the system integration. This topology facilitates a bidirectional flow of power between the PV source, the storage unit and the utility grid. The greatest advantage of this topology is its flexibility with different voltage levels of the solar inverter DC connection and the storage battery which requires no circuit alteration for charging batteries of different ratings. The hardware for the system is also fabricated. The results demonstrate that the proposed topology fits the generalized requirements.
Volume: 10
Issue: 1
Page: 366-373
Publish at: 2019-03-01
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