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30,907 Article Results

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

Statistical analysis of night radiance RH using VIIRS day/night band satellite time series data

10.11591/ijaas.v8.i1.pp26-33
Jyoti U. Devkota
Amount of night lights in an area is a proxy indicator of electricity consumption. This is interlinked to indicators of economic growth such as socio-economic activities, urban population size, physical capital, incidence of poverty. These night lights are generated by renewable and non renewable energy source. In this paper the behavior of night radiance RH data was minutely analyzed over a period of 28 hour; Visible Infrared Imaging Radiometer Suite Day/Night Band (VIIRS DNB) satellite earth observation data were used. These 28 hours and 8936 observations time series data is from 2 September 2018 to 4 September 2018. The behavior of night radiance RH data over 122 time intervals was analyzed using box plots. It was seen that the arithmetic mean of RH data is more sensitive than the arithmetic mean of first order difference of RH data. The first order difference of night radiance RH was regressed on night radiance over 110 intervals of time. The box plot of slope and intercept of this linear regression showed the behavior of these regression parameters over 110 intervals of time. It is seen that the data are more scattered with respect to slope than with respect to intercept. 
Volume: 8
Issue: 1
Page: 26-33
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

Effect of chemical reaction on MHD flow with heat and mass transfer past a vertical porousplate in the presence of viscous dissipation

10.11591/ijaas.v8.i1.pp83-94
Satyabrat Kar , N. Senapati , B. K. Swain
An attempt is made to study an unsteady MHD free convective flow with heat and mass transfer past a semi-infinite vertical porous plate immersed in a porous medium. Presence of viscous dissipation and chemical reaction are taken into account. It is assumed that the plate is moved with uniform velocity in the direction of fluid flow. Viscous dissipation term leads nonlinearity in the governing equations. Applying perturbation technique, the solutions for velocity, temperature and concentration are obtained. The effect of various parameters such as Rc, Gr, Gc, Sc etc. on velocity, temperature and concentration are shown through graphs.
Volume: 8
Issue: 1
Page: 83-94
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

KED-AES algorithm: combined key encryption decryption and advance encryption standard algorithm

10.11591/ijaas.v8.i1.pp44-53
Edwin Romeroso Arboleda , Carla Eunice R. Fenomeno , Joshua Z. Jimenez
Two existing cryptosystems are being combined and proposed. It is the enhanced combination of KED (Key Encryption Decryption), a cryptosystem that uses modulo 69 and the AES (Advance Encryption Standard) cryptography. The strength of the KED is that the keys are being used by the sender and the receiving end. The AES is easy to implement and has good defense against various attacks such as hacking.
Volume: 8
Issue: 1
Page: 44-53
Publish at: 2019-03-01

A categorical data analysis of impact of biogas on women of rural households – with examples from Nepal

10.11591/ijaas.v8.i1.pp34-43
Jyoti U. Devkota
This paper is based on primary data collected from 400 households of biogas consumers. A detailed structured questionnaire was developed and pretested. Here response to each question was given as a multiple choice option resulting in more than 450 categorical data. These variables studied various aspects of households using biogas. The results focused on women of these households. Interrelationships between several other variables including the role of a woman in various decisions related to the plant were analyzed. Logistic regression of decision making of woman on several variables including asset index of the family was done. This asset index was calculated from the principle component analysis of socio-economic variables. The family dynamics in the choice of biogas as renewable energy source was quantified using odds ratio and regression coefficients. The interdependence between variables was tested using Chi square test of Independence of Attributes. A novel data based approach of generation and analysis of categorical data is demonstrated here. The suitability of generation of categorical data in the absence of accurate measurement instruments is highlighted. This method is also suitable for countries without a strong backbone of good quality official records, and provides a good backup data for official statistics.
Volume: 8
Issue: 1
Page: 34-43
Publish at: 2019-03-01

Comparative study of the most efficient maximum power point tracking techniques for a photovoltaic system

10.11591/ijaas.v8.i1.pp73-82
I. M. Abdel-Qawee , H. G. Hamed , Maged N. F. Nashed , Ayman Y. Yousef , Khaled M. Hasaneen
In Photovoltaic (PV) systems, maximum power point tracking (MPPT) is an important challenge which faces this system. In this paper, a comparative study between two high efficient MPPT control techniques is presented. These techniques are based on the incremental conductance (IC) method. The first technique is based on optimized PI-controller gains and the other is based on Fuzzy Logic Control (FLC). The comparison between the algorithms is investigated under different environmental conditions. The comparison criteria which are taken into consideration are: the percentage tracking factor (%TF), the tracking time, the ripple voltage in the steady-state, the dynamic response, and the complexity of implementation.
Volume: 8
Issue: 1
Page: 73-82
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

The influence of problem based learning towards social science learning outcomes viewed from learning interest

10.11591/ijere.v8i1.15594
Berti Dyah Permatasari , Gunarhadi Gunarhadi , Riyadi Riyadi
The aim of this study is to determine the influences of Problem Based Learning and learning interest at improving the cognitive learning outcomes in social science of fourth-grade elementary school students. This study is a quasi-experiment study with pre-test and post-test control group design. The sample collection is taken with stratified cluster random sampling technique. The sample of this study is 109 fourth-grade elementary school students, consisted of 50 students from experiment group and 59 students from control group. The students from experiment group are given the application of Problem Based Learning, while the students in control group are given the application of Direct Instruction. The data collection is carried by using the instruments of social science learning outcomes test and social science learning interest questionnaire. The validity of test and questionnaire instruments is carried by expert judgement. The difficulty level, distinguishing power, and reliability of test instrument is tested by using ITEMAN application. The internal consistency and reliability of questionnaire instrument is tested by using SPSS application. The data is analysed by using two-way anova. The outcomes of the study show that PBL and learning interest contribute significant impact towards social science learning outcomes of elementary school students.
Volume: 8
Issue: 1
Page: 39-46
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

Embedded patient monitoring system

10.11591/ijpeds.v10.i1.pp388-397
Jayanna Kanchikere , A.K. Ghosh , Kalyankumar Kalyankumar
ICU remains for Intensive Care Unit, a place in the recuperating office where wiped out patients are checked eagerly. Commonly, the patient-staff extent is low and the LIFE-SAVING EQUIPMENT used is outstandingly bleeding edge Generally ICU is a healing facility for course of action of genuine nursing and remedial consideration of essentially wiped out patients, depicted by high bore and measure of unending nursing and restorative supervision and by use of cutting edge checking and resuscitative equipment The patients in the ICU require a predictable seeing of their Temperature and pulse circulatory strain. This undertaking is a working model, which wires sensors to evaluate imperative parameters specifically the Temperature, Respiratory temperature and Heart Beat. The sensors are interfaced to PC, with the objective that the condition of a patient can be explored by masters in any bit of the center wherever they are. At whatever point there is a variety from the standard felt by the patient, the particular patient will give an alert movement, by which the pro can race to the patient. Despite when the patient is in a careless condition, each one of the parameters will be identified and pro will be admonished, thusly it diminishes master's remaining task at hand and besides gives more correct results .Our endeavor is a working model which wires sensors to measure each one of these parameters like body temperature, Respiratory Temp and Heart Beat rate and trade it to the PC, with the objective that the patient condition can be examined to by authorities in any bit of the recuperating focus wherever they are. In this way it decreases experts work stack and besides gives more exact results, wherever there is a variety from the standard felt by the patient, we have in like manner combined saline watching system which gives an alert when the saline container going to cleanse.
Volume: 10
Issue: 1
Page: 388-397
Publish at: 2019-03-01

Views towards the revolution history course of foreign students in Turkey

10.11591/ijere.v8i1.14965
Zafer Tangülü , Beytullah Kaya
Studying history in accordance with gaining the legitimacy of the official ideology and reaching the historical bases that will open the way for the national identity for all teaching stages starting from primary education to tertiary education has made the national history subjects and naturally the topics of the Principles of Atatürk and History of the Turkish Revolution course both important and valuable. Although the teaching of Principles of Atatürk and History of the Turkish Revolution course has a role in the realization of national goals in higher education, the universal messages the program contains clearly demonstrate that the course has also a universal role beside the national identity of it. The purpose of this study is to investigate the opinions of foreign students studying in Turkey towards Principles of Atatürk and History of the Turkish Revolution course. To this end, this research is a case study in the qualitative research design. 12 foreign students studying at Istanbul Sebahattin Zaim University participated the study. The participants of the study were selected by purposive sampling method among criterion sampling methods. The criterion to pick these students was that they were accepted on the condition that they did Principles of Atatürk and History of the Turkish Revolution course for at least one semester at university. 6 female and 6 male students participated the study. Semi-structured interview form with 5 questions was prepared in order to determine the opinions of students participating in the research and content analysis was utilized to analyze the data obtained from the research and discourse analysis methods were employed to present the data. The opinions of the participants were transcribed and similar responses were categorized under certain headings. Research findings show that students are of the opinion that the course is very necessary for them and that it helps them to get scholar knowledge on Turkish history and it also helps them to get accurate history knowledge.
Volume: 8
Issue: 1
Page: 9-19
Publish at: 2019-03-01

Parameter estimation of DC motor through whale optimization algorithm

10.11591/ijpeds.v10.i1.pp83-92
Byamakesh Nayak , Sangeeta Sahu
This article estimates the unknown dc motor parameters by adapting the adaptive model with the reference model created by experimental data onto armature current and speed response from separately excited dc motor .The field flux dynamics, which is usually ignored, is included to model the dynamics of the motor. The block diagram including the flux dynamics and model parameters is considered as the adaptive model. The integral time square error between the instant experimental data and the corresponding adaptive model data is taken as cost function. The Whale optimization algorithm is used to minimize the cost function. Additionally, to improve the performances of optimization algorithm and for accurate result, the experimental data is divided into three intervals which form the three inequality constraints. A fixed penalty value is added to the cost function for violating these constraints. The effectiveness of estimation with two different methods is validated by convergence curve.
Volume: 10
Issue: 1
Page: 83-92
Publish at: 2019-03-01
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