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25,002 Article Results

Effect of Switching Frequency in DTC Based Switched Reluctance Motor Drive

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3922
Srinivas Pratapgiri
Since the magnetizing characteristics are highly non-linear in nature, the torque ripple is high in the Switched Reluctance Motor (SRM). The torque ripple can be minimized by using a novel control technique called Direct Torque Control (DTC). In DTC technique, torque is controlled directly through control of magnitude of the flux-linkage and change in speed of the stator flux vector. The flux and torque are maintained within set hysteresis bands. This paper analyzes performance of the DTC based drive mainly in terms of the torque ripple in MATLAB/SIMULINK environment and results are discussed elaborately. The paper also analyzes the effect of these two bands on switching frequency of the converter. http://dx.doi.org/10.11591/telkomnika.v12i12.6718 
Volume: 12
Issue: 12
Page: 8085-8091
Publish at: 2014-12-01

Adaptive PID Type Iterative Learning Control

https://ijece.iaescore.com/index.php/IJECE/article/view/5527
Sara Zamiri , Ali Madadi , Hamid-Reza Reza-Alikhani
In this paper, an adaptive PID-type iterative learning control scheme is proposed for tracking problem in repetitive systems with unknown parameters. In this scheme, we use a combination of an optimal PID-type iterative learning controller and progection like adgusting algorithm that is based on tracking error which decreases by iterations increment. Layapunov method is used for convergence analysis of the presented scheme, and convergence condition is obtained in term of algorithm step size range. the effectiveness of proposed technique is illustrated by simulation results.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6432
Volume: 4
Issue: 6
Page: 962-973
Publish at: 2014-12-01

The FHA Analysis of Dual-Bridge LLC Type Resonant Converter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5027
Arnold Fredderics , K.Vinoth Kumar , Jeya Selvan Renius , Raja Guru , Sree Lakshmi Nair , K. Viswanatha
The dual bridge resonant converter is designed in this paper. In this converter the LLC type resonance configuration is proposed .This types is compared with the other configurations and its benefits are narrated in this paper. The steady-state analysis of the LLC configuration is done using fundamental harmonics approximation method and the values for the components of resonance configuration is found and used for simulation. The simulation results shows that the converter is able to achieve the zero voltage switching for the wide load range and attains a good efficiency.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6513
Volume: 4
Issue: 4
Page: 538-546
Publish at: 2014-12-01

A Novel Technique for Vector Control of Single-Phase Induction Motors Based on Rotor Field-Oriented Control

10.11591/ijeecs.v12.i12.pp8104-8113
Mohammad Jannati , Sajad Abdollahzadeh Anbaran , Nik Rumzi Nik Idris , Mohd Junaidi Abdul Aziz
Due to asymmetrical characteristics of single-phase IMs, conventional vector control methods for three-phase IMs cannot be directly applied to single-phase IMs. This study aims to improve performance of the single-phase IMs drive system. Hence, a novel control approach based on Rotor Field-Oriented control (RFOC) was developed for single-phase IMs. For this purpose, transformation matrices are applied to the machine equations. It is shown by applying these transformation matrices to the unbalanced equations of single-phase IM results in set of balanced equations with backward and forward components. Therefore, by some modifications in the conventional RFOC method for three-phase IM, vector control of single-phase IM can be done. The proposed method demonstrates reasonably good speed and torque responses with satisfactory tracking capability. It is shown the effect of using this supposition is reflected on the motor torque and hence speed oscillations. Due to good tracking capability of proposed drive system, this control technique can be a well-suited candidate for application where precise move of IM in required such as cutting, knurling and deformation processes.
Volume: 12
Issue: 12
Page: 8104-8113
Publish at: 2014-12-01

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
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