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28,188 Article Results

Application of Distribution Power Electronic Transformer for Medium Voltage

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5028
Prashant Kumar
In   this   paper   a   distribution   power electronic transformer (DPET) for feeding critical loads is presented. The PE based transformer is a multi-port converter that can connect to medium voltage levels on the primary side. Bidirectional power flow is provided to the each module. The presented structure consists of three stages: an input stage, an isolation stage, and an output stage.  The input current is sinusoidal, and it converts the high AC input voltage to low DC voltages. The isolated DC/DC converters are then connected to the DC links and provide galvanic isolation between the HV and LV sides. Finally, a three-phase inverter generates the AC output with the desired amplitude and frequency. The proposed DPET is extremely modular and can be extended for different voltage and power levels. It performs typical functions and has advantages such as power factor correction, elimination of voltage sag and swell, and reduction of voltage flicker in load side. Also in comparison to conventional transformers, it has lower weight, lower volume and eliminates necessity for toxic dielectric coolants the DPET performance is verified in MATLAB simulation.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6395
Volume: 4
Issue: 4
Page: 547-556
Publish at: 2014-12-01

New Research on MEMS Acoustic Vector Sensor Used in ground Marker of Pipeline

10.11591/ijeecs.v12.i12.pp8126-8132
Mengran Liu , Guojun Zhang , Zeming Jian , Hong Liu , Xiaopeng Song , Wendong Zhang
Recently, ground marker based on the principle of acoustic detection has become the trend of pipeline technology. As to the difficulty and low accuracy of ground marker, this paper introduces a new MEMS bionic acoustic vector sensor with high sensitivity, good performance in low frequency and lower power. As to the problem of the port/starboard blur of this vector sensor in ground marking, it proposes a new plan and proves the correctness of the plan through theoretic analysis and experimental verification. The results show that the mean error of the directional angle is within 5 degree meeting the needs of the engineering project.
Volume: 12
Issue: 12
Page: 8126-8132
Publish at: 2014-12-01

Bidirectional Luo Converter Fed Switched Reluctance Motor

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3927
R. Balamurugan , M. Vishvanath
The present work aims at designing and modelling of a bidirectional DC-DC LUO converter for driving a Switched Reluctance Motor. LUO converters are new series of DC/DC Converters that have very low ripple of voltage and current and have output wave with high quality, high power density and high transfer voltage gain and don’t have circuit elements parasitic limits of traditional converters. LUO converters have very high voltage transfer gains in geometric progression on stage by-stage. A C- Dump converter is used to drive the SRM drive. The present design aims at improving the efficiency of the Switched Reluctance Motor drive system by the incorporation of the bidirectional DC-DC LUO converter between the electrical source and the drive system.  http://dx.doi.org/10.11591/telkomnika.v12i12.6883 
Volume: 12
Issue: 12
Page: 8120-8125
Publish at: 2014-12-01

Circularly Polarized Cylindrical Dielectric Resonator Antenna with Different Shapes Cross Slot

https://ijece.iaescore.com/index.php/IJECE/article/view/5529
Zahra Rahimian
A cross slot coupled cylindrical dielectric resonator antenna (CDRA) operating in the X-band (8GHz -12GHz) frequency range is studied. The proposed CP designs are achieved by implementing a suitable cross slot on the ground plane (in the case of aperture coupled feed method), which results in excitation of two near degenerate orthogonal modes of near equal amplitudes and 90°phase difference. Attempts are made to change the geometry of slots ends to introduce a novel structure in order to achieve a better impedance bandwidth with an improved 3dB axial ratio (AR) bandwidth. It is found that the hourglass of cross slot has a great effect on the strength of coupling between the feed line and the dielectric resonator antenna. In simulation an impedance bandwidth of 46.15% and axial ratio bandwidth of 22% has been achieved with the above geometry. An improvement of 12% in impedance bandwidth and 11.2% in Axial ratio bandwidth is obtained over conventional rectangular cross slot.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6484
Volume: 4
Issue: 6
Page: 974-978
Publish at: 2014-12-01

Performance Indices Based Optimal Tunning Criterion for Speed Control of DC Drives Using GA

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5019
Deepti Singh , Brijesh Singh , Nitin Singh
This paper presents a framework to carry out a simulation to tune the speed controller gains for known input of DC drive system. The objective is to find the optimal controller gains (proportional and integral) in a closed loop system. Various performance indices have been considered as optimal criterion in this work. The optimal gain values have been obtained by conventional and Genetic Algorithm (GA) based optimization methods. The study has been conducted on a simulink model of three phase converter controlled direct current (DC) drive with current and speed control strategy. The results show that the GA based tunning provided better solutions as compared to conventional optimization methods based tunning.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6334
Volume: 4
Issue: 4
Page: 461-473
Publish at: 2014-12-01

A Compact SIW Mixer For Millimeter-Wave Applications

https://ijece.iaescore.com/index.php/IJECE/article/view/5506
Abdelkhalek Nasri , Hassen Zairi , Ali Gharsallah
The present paper highlights an innovative broadband millimeter-wave single balanced diode mixer which is designed using a newly designed 90 substrate integrated waveguide (SIW) coupler and two cavity (SIW) filters. The mixer covers RF/LO operating frequency range which fluctuates between 10 to 12 GHz and IF port covers 2GHz. The proposed mixer exhibits a fairly low conversion loss of less than 10 dB and high port to-port isolations over the frequency band of interest as the simulated results make clear. Furthermore, the two cavities SIW filter is embedded to achieve a better image frequency suppression of about 28dB.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6684
Volume: 4
Issue: 6
Page: 902-908
Publish at: 2014-12-01

New Structure for Photovoltaic Systems with Maximum Power Point Tracking Ability

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5022
Mostafa Barzegar Kalashani , Murtaza Farsadi
This paper proposes a new structure for photovoltaic (PV) arrays with a new inverter topology. A quasi-Z-Source DC-DC Converter (qZSC) with capability of dividing its output voltage to the same voltages and tracking maximum power point is proposed. The Proportional-Integral Incremental Conductance (PI-IncCond) method is used for maximum power point tracking (MPPT). Description of proposed structure along with detailed simulation results that verify its feasibility are given to demonstrate the availability of the proposed system by MATLAB/Simulink software.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6365
Volume: 4
Issue: 4
Page: 489-498
Publish at: 2014-12-01

A New Procedure to Detect Low Interaction Honeypots

https://ijece.iaescore.com/index.php/IJECE/article/view/5543
Eleazar Aguirre-Anaya , Gina Gallegos-Garcia , Nicolás Solano Luna , Luis Alfonso Villa Vargas
Honeypots  systems  are   an   important  piece  of   the   network  security infrastructure and can be deployed to accomplish different purposes such as: network sensing, capturing and learning about 0-day exploits, capturing and analyzing of black hat techniques, deterring black hats and data gathering for doing  statistical  analysis  over  the  Internet  traffic,  among  others. Nevertheless, all honeypots need to look like real systems, due to if a honeypot is unmasked, it loses its value. This paper presents a new procedure to detect low interaction honeypots, through HTTP request, regardless honeypot architecture. It is important to mention that Low Interaction Honeypots network services need to be improved in order to get trustworthy information. Otherwise, it should consider data obtained by low interaction honeypots like inaccurate and unreliable information.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6885
Volume: 4
Issue: 6
Page: 848-857
Publish at: 2014-12-01

Study on the Evaluation Ability of Personalized Information Service of Higher Vocational Library

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3951
XinJuan Zhou , Meiying Nie
Higher vocational library personalized service, refers to the user's preferences, habits, such as unique requirements for information services, it is aimed at higher vocational teachers and students in the teaching, scientific research and the different needs of a corresponding type of service. The root of the individualized service is to respect the user, the user's behavior and habits, for the user to select more important resources and provide the more thoughtful service characteristics. From constructing the high vocational school library personalized service guarantee system, perfecting the high vocational school library personalized service content and construct the high vocational school library personalized service interaction mechanism to promote higher vocational library personalized information service to improve efficiency. In the final analysis, the high vocational school library personalized information service ability evaluation of first and second index, the result is satisfactory. http://dx.doi.org/10.11591/telkomnika.v12i12.4893 
Volume: 12
Issue: 12
Page: 8319-8325
Publish at: 2014-12-01

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

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
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