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25,016 Article Results

Fuzzy Bang-Bang Control Scheme of USSC for Voltage Sag Mitigation Due to Short Circuits and Induction Motor Starting in Distribution System

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5018
Mohammad Mohammadi , Ashkan Mohammadi Rozbahani , Saman Abasi Garavand , Mahdi Montazeri , Hamed Memarnezhad
Unified series shunt compensator (USSC) has been widely used to mitigate various power quality disturbances in distribution network. The USSC is almost similar to the UPFC, but the only differences are that the UPFC inverters are in shunt series connection and used in transmission systems whereas the USSC inverters are in series-shunt connection and used in distribution systems. USSC, it is possible to compensate a different power quality problem as compared to DSTATCOM and DVR. It is noted that, mitigated load voltage by the DVR is lower than mitigated value obtained by USSC. In other words the USSC can mitigate voltage sag better in compared to DVR and D-STATCOM. Also in case of voltage flicker, unbalance and harmonics elimination it is much effective.  Similarly, D-STATCOM is unable to control power flow.  It is seen that the proposed USSC can mitigate variety of power quality (PQ) problems. Hence due to multi capability of USSC in power quality improvement, this paper presents the scheme based on fuzzy bang-bang control for USSC. Using Fuzzy Logic Control (FLC) based on bang-bang control; the USSC will contribute to improve voltage sag without deteriorating the effect of the other compensating devices.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6254
Volume: 4
Issue: 4
Page: 451-460
Publish at: 2014-12-01

Computing Simulation of Post-buckling in Functionally Graded Materials - A Review

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3954
Elias Randjbaran , Rizal Zahari , Ramin Vaghei
A review on the recent development in the non-linear flutter and thermal buckling of an FGM panel under the combined effect of elevated temperature conditions and aerodynamic loading is investigated using a finite element model based on the thin plate theory and von Karman strain-displacement relations to account for moderately large deflection. The governing non-linear equations are obtained using the principal of virtual work adopting an approach based on the thermal strain being a cumulative physical quantity to account for temperature dependent material properties. This system of non-linear equations is solved by Newton–Raphson numerical technique. It is found that the temperature increase has an adverse effect on the FGM panel flutter characteristics through decreasing the critical dynamic pressure. Decreasing the volume fraction enhances flutter characteristics but this is limited by structural integrity aspect. Structural finite element analysis has been employed to determine the FGM panel's adaptive response while under the influence of a uniaxial compressive load in excess of its critical buckling value. It is shown that, utilising the considerable control authority generated, even for a small actuator volume fraction, the out-of-plane displacement of the post-buckled FGM panel's can be significantly reduced.  http://dx.doi.org/10.11591/telkomnika.v12i12.6672 
Volume: 12
Issue: 12
Page: 8344-8348
Publish at: 2014-12-01

Improvement of Transient Stability Performance of Captive Power Plant During Islanding Condition

10.11591/ijeecs.v12.i12.pp8001-8007
Utpal Goswami , Tapas Kumar Sengupta , Arabinda Das
This paper deals with an idea to improve the transient stability of captive generator sets during islanding condition. But doing so, the transient stability of the generator sets and the power system is severely disturbed in case of a fault in the utility side. In case of fault, the own generation is isolated, synchronization is lost and finally the sets go in islanding mode of operation. As such sets are of small size (5-50 MWs), total load throw-off in utility side causes disturbance in the transient form. If disturbances are not recovered immediately in terms of turbine speed, voltage variation etc., the power supply will be unstable and process suffers. A remedial measure, for the case concerned, can be taken with the aid of a SVC during the tripping of the utility load, at the generator bus before the frequency and voltage stabilization. The analysis was done using ETAP software.
Volume: 12
Issue: 12
Page: 8001-8007
Publish at: 2014-12-01

A High-accuracy Detection Method Research for Electric Power Harmonic

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3910
Jingfang Wang
In this paper, a time-frequency filter is designed，which can detect the frequency, amplitude and phase of any order harmonics and  interharmonics in signal by means of time domain convolution．The theory analysis are carried to this method  and the calculate formula are concluded, the spectral leakage and the barrier domino offect are shun, the non-integer order wave are eluded, which are engendered  in Fourier domain．Experiment simulation results show that time-frequency filtering convolution flunction can be designed and realized neatly and conveniently ; the influences of fundamental frequency fluctuation on harmonic analysis are restrained by using the approach presented in this paper；the  relative errors of calculating fundamental frequencies with many order harmonics and  interharmonics are no more than 0.00008%, the relative erors of calculating amplitudes are no more than 0.00013%，and those of calculating initial phases are no more than 0.078%． http://dx.doi.org/10.11591/telkomnika.v12i12.6474 
Volume: 12
Issue: 12
Page: 7996-8000
Publish at: 2014-12-01

By Using Model Shift and Improving The Walking Facilities: A Case Study In Kuala Lumpur, Malaysia

10.11591/ijaas.v3.i4.pp184-195
Ali A Mohammed
The recent increase in privately owned vehicles has caused numerous problems: traffic congestions, unnecessary fuel lost and global warming are only few of these problems. This study will try to understand people’s behavior and modal choice and try to sway them to means of public transportation. A survey of mode choice between cars users in a neighborhood in Kuala Lumpur was conducted. A total of 25 surveys were collected over the course of a month. Among data collected were demographic details such as age, gender, educational level and travel behavior. The data was processed by SPSS software to determine which factors encourages and discourages using private, public transportation or walking. The study highlighted four models travel time reduction, travel cost reduction, and increase the parking charges and improves the walking facility. The sensitivity analysis results show that the main attraction that might switch private car users is travel time and improving the walking facility. The consequences of these would be less traffic on the roads contributing to less pollution and greater safety.
Volume: 3
Issue: 4
Page: 184-195
Publish at: 2014-12-01

Sliding Mode Backstepping Control of Induction Motor

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5021
Othmane Boughazi , Abdelmadjid Boumedienne , Hachemi Glaoui
This work treats the modeling and simulation of non-linear system behavior of an induction motor using backstepping sliding mode control. First, the direct field oriented control IM is derived. Then, a sliding for direct field oriented control is proposed to compensate the uncertainties, which occur in the control.Finally, the study of Backstepping sliding controls strategy of the induction motor drive. Our non linear system is simulated in MATLAB SIMULINK environment, the results obtained illustrate the efficiency of the proposed control with no overshoot, and the rising time is improved with good disturbances rejections comparing with the classical control law.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6532
Volume: 4
Issue: 4
Page: 481-488
Publish at: 2014-12-01

Relations between the Causative Factors of Waste and Their Preventive Measures in China Construction Sites

10.11591/ijaas.v3.i4.pp178-183
Sulala M.Z.F AL-Hamadani , Luo qing , Guilong Peng , Miaocheng Weng
Material waste has been considered as a major problem in the construction industry. Material waste not only has a negative impact on the success and efficiency of construction project, but also on construction cost, construction time, productivity and sustainability aspects. This paper aims to identify the major causative factors of material waste in China construction sites, their preventive measures and the relations between them. For this purpose, views of Chinese construction industry practitioners in Chongqing city were gathered by a questionnaire survey. The respondents were requested to rate a total of 34 causative factors of material waste and 9 preventive measures, which were gathered from previous literature. These causative factors were grouped into eight categories: Design, Handling, Procurement, Operation, Worker, Management, Site condition and External factors. The major causative factors of each category and preventive measures of waste were determined. Based on the identification of major factors and measures, the relations between them were also determined.
Volume: 3
Issue: 4
Page: 178-183
Publish at: 2014-12-01

A Design of Bang-Bang PLL in Low Jitter and Wide Pull-in Range

10.11591/ijeecs.v12.i12.pp8212-8216
Xihong Chen , Qiang Liu , Denghua Hu
As bang-bang PLL (BBPLL) could resume clock data rapidly, its application in clock data recovery has become increasingly abroad. Aiming at the contrary demand of lower jitter and wider pull-in range of BBPLL, the issue puts forth a method to choose the most appropriate gain of digitally controlled oscillator (DCO) to settle. A judged and modified model has been added to the 2nd order traditional BBPLL, which modified the gain of DCO dynamically by step forward method. Meanwhile it proposes pull-in jitter function (PJF) to judge the modified results. Then it takes a gradual comparison means to search the max PJF. It could be concluded from the simulations that the algorithm of the issue could get a compromise DCO gain in view of BBPLL’s jitter and pull-in range.
Volume: 12
Issue: 12
Page: 8212-8216
Publish at: 2014-12-01

Artificial Neural Network Based Economic Generation Scheduling in Nigeria Power Network

10.11591/ijaas.v3.i4.pp206-214
Omorogiuwa Eseosa , Onohaebi S.O
Economic generation scheduling determines the most efficient and economic means of dispatch of generated energy to meet the continuously varying load demand at the most appropriate minimum cost, while meeting all the units equality and inequality constraints in  power network. This is currently not applicable in Nigeria power network. The network under study consists of seventeen (17) generating stations (Existing Network, National Integrated Power Projects and the Independent Power Producers). This work investigates economic generation and scheduling in Nigeria 330KV integrated power network at minimum operating cost using the classical kirmayer’s method and Artificial Neural Network (ANN) for its optimization in Matlab environment. ANN is trained to adopt its pattern at different load demands and acquires the ability to give load demand as soon as the set target and goal tends to equality. Cost function for each generating unit as well as a model for economic generation scheduling was developed.
Volume: 3
Issue: 4
Page: 206-214
Publish at: 2014-12-01

Modeling The Influential Factors Of 8th Grades Student’s Mathematics Achievement In Malaysia By Using Structural Equation Modeling (SEM)

10.11591/ijaas.v3.i4.pp172-177
Ahmad Nazim
This research demonstrates the application of Structural Equation Modeling (SEM) method in order to obtain the best fit model for a more efficient and accurate inter-relationship among variables findings and interpretation. For the purpose of this study, secondary data of Trends in International Mathematics and Science Study (TIMSS) was used. The questionnaire were distributed by using two stage stratified cluster sampling technique to 5733 eighth grades students in Malaysia. A Confirmatory Factor Analysis (CFA), Discriminant Validity and Path Analysis had been conducted to obtain the best fit model of SEM. At the end of the study, a best fit model will be obtained for a better accuracy and precision estimation in further analysis.
Volume: 3
Issue: 4
Page: 172-177
Publish at: 2014-12-01

Cut Detection in Remote Versatile Wireless Sensor Mobile Networks

10.11591/ijaas.v3.i4.pp202-205
LEELADHAR annepu
A remote sensor system can get differentiated into different joined segments because of the disappointment of some of its hubs, which is known as a "cut". In this project we consider the issue of catching cuts by the remaining hubs of a remote sensor system. We propose a calculation that permits (i) each hub to recognize when the integration to an exceptionally assigned hub has been lost, and (ii) one or more hubs (that are associated with the uncommon hub after the cut) to discover the event of the cut. The calculation is circulated and non concurrent: each hub needs to correspond with just those hubs that are inside its correspondence range. The calculation is focused around the iterative processing of an imaginary "electrical potential" of the hubs. The union rate of the hidden iterative plan is autonomous of the size and structure of the system. Remote Sensor Networks (Wsns) comprise of a huge number of small hubs having the ability of sensing, calculation, and remote correspondences. Remote sensor system can endure part issue in the system which is known as a cut. So a solitary topology of the system breaks into two or more parts. Here we examine a few slice recognition systems to discover the cuts in WSN.
Volume: 3
Issue: 4
Page: 202-205
Publish at: 2014-12-01

The Preprocessing and Probing Technique of Open Capacitated Vehicle Routing Problem with Split and Time Deadline (OCVRP-St) Model In Rubbish Transportation Problem

10.11591/ijaas.v2.i4.pp193-200
Irmeilyana Irmeilyana , Fitri Maya Puspita , Indrawati Indrawati , Fitra Nur Azizah
The activity of rubbish transportation in Palembang is one of the applications of Vehicle Routing Problem (VRP) in transporting rubbish in Sako Palembang by applying preprocessing and probing techniques to obtain simplest OCVRP model. The solution is conducted by using LINDO software. The results show that the optimal routes in Sukarami before and after applying the tehniques are the same routes. In addition, we obtain the reduction of constraints and variables, the reduction of iteration numbers and the optimal value did not change.
Volume: 2
Issue: 4
Page: 193-200
Publish at: 2014-12-01

A Review: Management of Alternaria and its Mycotoxins in Crops

10.11591/ijaas.v3.i4.pp165-171
Brian Gagosh Nayyar , Shaista Akhund , Abida Akram
The Deuteromycetes fungal genus Alternaria comprises of different saprophytic as well as endophytic species which are very common and worldwide in their occurance. Importance host plants include several crops. Alternaria spp. generally attacks the aerial ptarts of its host and early blight diseases caused by these fungi inflict serious damage to these crops. There is a growing concern of Alternaria spp. due to their ability to produce mycotoxins with different toxicological properties, which are harmful for human and animal health. Accurate identification of Alternaria spp. and their metabolites is a crucial phase in the implementation of preventive measures and controls in the system from farm to fork. Considering the importance of Alternaria spp. occurance on crops and Alternaria toxins risk assesment, additional studies in this area are indispensable.
Volume: 3
Issue: 4
Page: 165-171
Publish at: 2014-12-01

Emperical Computation of Solar Radiation and Determination of Regression Coefficients for Khulna City

10.11591/ijeecs.v12.i12.pp8015-8021
Mohammad Arif Sobhan Bhuiyan , Abdus Sobhan Bhuiyan , Muhammed Jamshed Alam Patwary , Subrina Akter , Mohammad Monjur Alam
This study is accomplished to calculate global, diffuse and direct solar radiation empirically on a horizontal surface for the divisional district “Khulna” in Bangladesh (latitude 22o47΄N and longitude 89o34΄E) as well as to predict correlations for it by using several meteorological data for 32 years between 1980 and 2012. The global radiation is found to be maximum in the month of April and minimum in the month of December here. The estimated values of the Angstrom’s regression constants a and b are 0.2388 and 0.5228 respectively. The other regression constants were also computed and the correlations proposed for Khulna can be used in future for the estimation of global, diffuse and direct solar radiation if the meteorological parameters remain available.
Volume: 12
Issue: 12
Page: 8015-8021
Publish at: 2014-12-01

Magnetic Field Effect on the Electrical Characteristics of a Monocrystalline n+pp+ Silicon Solar Cell

10.11591/ijaas.v3.i4.pp196-201
sarhan musa
In this paper, the effect of magnetic field on I-V characteristics of a silicon solar cell of n+pp+ structure is studied in dark and illumination modes. In dark, both the current and the voltage decrease with increasing the magnetic field in forward bias. However in reverse bias, the behavior is different. Under illumination, the effect of magnetic field on I-V characteristics of the silicon solar cell is studied experimentally and simulated using Neural Network Algorithm (NNA). Both short circuit current (Isc) and open circuit voltage (Voc) are measured under the influence of magnetic field. The solar cell efficiency and the fill factor (FF) are calculated without and with the magnetic field. This performance testing of the solar cell under magnetic field can be considered as one of the non-destructive reliability tools.
Volume: 3
Issue: 4
Page: 196-201
Publish at: 2014-12-01
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