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25,002 Article Results

Power Factor Correction using Valley-Fill SEPIC Topology with Fuzzy Logic Control

10.11591/ijeecs.v12.i11.pp7622-7630
R. Balamurugan , S. Hariprasath , R. Nithya
This paper deals with a new Single Ended Primary Inductance Converter (SEPIC) for Power Factor Correction (PFC). The proposed converter is used in combination with SEPIC and a valley fill circuit. The valley fill circuit improves the efficiency of the SEPIC by reducing the harmonics in the supply mains. The power factor is also enhanced compared to the conventional PFC converters. It uses the simple control strategy for controlling the power factor of the AC mains. It can be preferred to low power applications, since it has the merits like less input current ripples and less total harmonic distortion (THD). To observe the performance of the Valley fill circuit, a model based on the SEPIC topology has been designed by using MULTISIM and MATLAB / SIMULINK environment and implemented with one cycle control (OCC) and Fuzzy logic controller. The simulations results are demonstrated in order to validate the effectiveness of the controllers in power factor improvement.
Volume: 12
Issue: 11
Page: 7622-7630
Publish at: 2014-11-01

The Research Status and Development Trend of Electric Vehicle Power Supply Technology

10.11591/ijeecs.v12.i11.pp7690-7696
Hui Gao , Yingjun Wu
Electric vehicle (EV) power supply infrastructure construction and the related technologies are the prerequisite and core of the EV industry development respectively. This paper introduces the technology research and application situation of charging, battery swapping and smart charging/battery swap service network operation management in China, and meanwhile introduces the EV energy supply infrastructure construction and some typical pilot projects in China. And the EV energy supply technologies development trend is discussed at last.
Volume: 12
Issue: 11
Page: 7690-7696
Publish at: 2014-11-01

Handover Analysis of Data and VoIP Services in 802.11b/g/n Wireless LAN

10.11591/ijeecs.v12.i11.pp7832-7844
Imam Prasetyo , Muhammad Anif , Ari Sriyanto Nugroho , Subuh Pramono , Sarono Widodo , Sidiq S. Hidayat
IEEE 802.11b/g/n WLAN with conventional ESS infrastructure doesn’t support handover feature. Handover feature allows user to migrate services between APs without losing connection. Handoff latency is one problem in WLAN to perform real-time application such as VoIP. To bring seamless handover and QoS guarantee in ESS network, we propose five network optimization methods i.e.configuring overlapping area of APs, placing APs in one roaming domain, using the same SSID and security mode, choosing APs channel by margin of 5, and configuring APs as DHCP forwarder. Handover test is done by sniffing on the client that experienced handover. In the result, there are three steps in Layer 2 handoff, i.e. probing, authentication, and re-association with maximum handoff latency is 325.02 ms in data services and 67.412 ms in VoIP. In VoIP services, one way delay is 39.985 - 49.18 ms, one way jitter is 9.45 - 19.57 ms, and the packet loss is 0 - 0.548%. Overall, the built network system is able to guarantee QoS in handover case, both in data and VoIP services.
Volume: 12
Issue: 11
Page: 7832-7844
Publish at: 2014-11-01

Phasor Measurement Unit Based on Robust Dynamic State Estimation in Power Systems Using M-Estimators

10.11591/ijeecs.v12.i11.pp7631-7639
Sideig Abdelrhman Dowi , Gengyin Li
This paper introduces the uses of Robust Dynamic State Estimation (RDSE) with Phasor Measurement Unit (PMU), The M-Estimators Quadratic Linear (QL) and Square Root (SR) Estimators have been used. For the solution of the M-estimators problem, Iteratively Re-weighted Least Squares Estimation (IRLS) method is applied. In this work, we used the Decoupled Current Measurement (DCM) method to include the Phasor Measurement Unit in Robust Dynamic State Estimation. The proposed method has been tested on standard data 30-bus testing system as a case study.
Volume: 12
Issue: 11
Page: 7631-7639
Publish at: 2014-11-01

A Chaotic System Based Image Encryption Algorithm using Plaintext-related Confusion

10.11591/ijeecs.v12.i11.pp7952-7962
Yong Zhang
A new plaintext-related image encryption system based on the hyper-chaotic Lorenz system is proposed in this paper. In the proposed image encryption system, the hyper-chaotic Lorenz system is employed to generate six pseudo-random matrixes, where, two of them use the “add-modulus” operations to carry out the plaintext-unrelated image diffusion, and the other four matrixes are used to confuse the plaintext-related image. In the image confusion, each pixel will swap its location with another pixel, and the target location is determined by some elements in the plain image and the four matrixes. The proposed image encryption system can resist the chosen/known plaintext attacks due to the application of the plaintext-related image confusion in it. The simulation results show that the proposed encryption system also have the characters of fast encryption/decryption speed, large key space, strong key sensitivity, strong plaintext sensitivity, good statistical properties of cipher images, and large information entropy, etc. Thus, the proposed system can be used in practical communications.
Volume: 12
Issue: 11
Page: 7952-7962
Publish at: 2014-11-01

Impact of RDG Location on IDMT Overcurrent Relay Operation and Coordination in MV Distribution System

10.11591/ijeecs.v12.i11.pp7585-7594
Mohamed ZELLAGUI , Abdelaziz CHAGHI
In recent years there has been an intensive effort to increase the participation of renewable sources of electricity in the fuel and energy balance of many countries. In particular, this relates to the power of wind farms attached to the power system at both the distribution network. However, in the presence of Renewable Dispersed Generation, (RDG) some problems in coordination of protection devices will occur, due to changes in fault current levels at different points. By installing RDG in power distribution networks, the fault current levels are changed and may lead to some miscoordination in IDMT Directional Over-Current Relay (DOCR). In this paper, a novel approach is presented to study the impact of RDG location (dRDG) on IDMT characteristic curve of relay, fault current (IF), operation time (T) for DOCR, and coordination time interval (CTI) between backup and primary relays and short circuit level index (ISC) in the presence there phase fault on medium voltage (MV) distribution network. This new approach has been implemented on the Algerian 10 kV distribution power system in Constantine.
Volume: 12
Issue: 11
Page: 7585-7594
Publish at: 2014-11-01

Identification and Classification of Power System Faults using Ratio Analysis of Principal Component Distances

10.11591/ijeecs.v12.i11.pp7603-7612
Alok Mukherjee , Palash Kundu , Arabinda Das
Power system reliability operation has been one of the most vital topics under research. The power system network, mostly the long transmission lines is often subjected to different types of faults leading to maloperation of power flow. The idea of a reliable protection system is to most accurately and efficiently identifying the fault, classifying and the locating of fault. This paper represents the application of dynamic phasors in the form of Principal Component Analysis (PCA) to identify fault in a three phase one end fed 150 km long radial power system transmission line. In the proposed work, (1/4) cycle pre-fault and (1/2) cycle post fault line voltages have been extracted from Electromagnetic Transient Programming (EMTP) simulation. The proposed algorithm is trained using only one set of receiving end data carrying out fault only at the midpoint of the line to generate fault signatures using PCA. The eigenvectors and the score matrix thus obtained corresponding to the three phases using the above analysis have been utilized to construct the component distances, which have been analyzed using ratio analysis to extract the similar features of any particular fault individually.
Volume: 12
Issue: 11
Page: 7603-7612
Publish at: 2014-11-01

Design and Development of Sports Management Information System based on Acceleration Transducer

10.11591/ijeecs.v12.i11.pp7876-7883
Yongxin Wang , Honghong Zhang
This paper analyses and compares the acceleration sensor: ADXL330, ADXL345, ADXL203, and points out that the acceleration sensor functions in sports management system. Sports management system is the main controller in motion process command each node controller through the sensor to collect the movement process of the ADXL system the human body each point in three coordinate axes acceleration component. The article presents design and development of sports management information system based on acceleration transducer. Design of sports information management system based on three axis accelerometer can quickly and accurately collect human motion information, which provides a new method for the study of sports.
Volume: 12
Issue: 11
Page: 7876-7883
Publish at: 2014-11-01

Spectrum Comparative Study of Commutation Failure and Short-Circuit Fault in UHVDC Transmission System

10.12928/telkomnika.v12i4.300
Shi-long; Kunming University of Science and Technology Chen , Jun-xiang; Kunming University of Science and Technology Rong , Gui-hong; Kunming University of Science and Technology Bi , Xing-wang; Kunming University of Science and Technology Li , Rui-rui; Kunming University of Science and Technology Cao
When commutation failure occurs in UHVDC transmission system, the transient process of DC voltage and current are similar to grounding short-circuit fault. In order to differentiate them effectively, the paper introduces mathematical morphology methods to analysis the spectrum of transient current. Base on Yunnan-Guangzhou kV UHVDC transmission system, the paper simulates the commutation failure and DC line short-circuit fault under different fault conditions in PSCAD/EMTDC.  By modified morphology filter, the transient signal of DC () is decomposed into six scales, and morphological characteristics of aerial mode component of  is analyzed under different scales. The simulation results show that when DC line short-circuit faults occurs, wherever in the rectifier side, in the DC transmission line midpoint or in the inverter side, the aerial mode component of  have more high frequency weight in ~ and decays gradually; When commutation failures, which are caused by the inverter side AC system single-phase grounding fault, phase to phase fault, three phase grounding fault or the inverter side transformer ratio increased,  the aerial mode component of  have less frequency weight in.
Volume: 12
Issue: 4
Page: 753-762
Publish at: 2014-11-01

Non-Planar MOSFET Modeling with Analytical Approach

10.12928/telkomnika.v12i4.506
Munawar A; Universitas Diponegoro Riyadi , Darjat; Universitas Diponegoro Darjat , Teguh; Universitas Diponegoro Prakoso , Jatmiko; Universitas Diponegoro E. Suseno
Non-planar structures have been identified as promising structure for next device generation in the nanoelectronic era. However, the continuous device dimension scaling into nano regime eventually requires more sophisticated model due to the limitation of the existing models. A model for non-planar MOSFET structure was elaborated in this paper, especially for device with pillar structure, using analytical approach. The concern of channel shape and structure were discussed as well. The result shows the shift in subthreshold characteristic in the channel with recessed channel model. The charge sharing is suspected as one of the key parameter in the shift of performance in the recessed region.
Volume: 12
Issue: 4
Page: 779-786
Publish at: 2014-11-01

Contents of e-Government for Pursuing Value in Indonesian Local Government

10.11591/ijeecs.v12.i11.pp7895-7905
Alfira Sofia , Jann Hidajat Tjakraatmadja , Sudarso Kader Wiryono , Suhardi Suhardi
This research aimed to explore contents of Indonesian e-Government in order to obtain expected value effectively by considering obstacles in implementing e-Government. It was achieved by reviewing basic and applied theory of e-Government development. The study entails compilation of emerged benefits by triangulation of extensive literature review, case study (by best practices city/municipality in Indonesia) and FGD. Some problems in implementing e-Government explored in this research can be solved through simple and creative ways. It found that contents exploration of all relationships between 4 elements which are government, users, system, and environment, can be effective solution, which have been implemented by all successful cities/municipalities. The finding would help government policy and decision makers design and implement policies and strategies to improve e-Government services. The research is undertaken at Indonesian local government level as the first researches in Indonesian e-Government implementation by exploring best practice contents which emerged in each city/municipality.
Volume: 12
Issue: 11
Page: 7895-7905
Publish at: 2014-11-01

Mosquito Tracking by Image Segmentation of Optical Flow Field

10.11591/ijeecs.v12.i11.pp7798-7807
Jahangir Alam S.M. , Hu Guoqing
High speedy Mosquito tracking and a time efficient technique have been presented by considering on image segmentation of the optical flow which has been computed by image successive frames to track the Mosquito of a specific region of interest (SROI) on the region of field (ROF) with segmented flow regions. The optical flow has been established by the successive two frames to consider acquiring the image for computing. A fuzzy antagonism index has been indicated as the degree of the consistency of flying Mosquito. The image frames are used to segment the optical flow field. The images have been segmented in flow field with in the different consistency of region of interest (ROI). The specific region of interest (SROI) can be detected in the different ROI spaces. Therefore, the Mosquito can be tracked from two subsequent images. However, the detected specific region of interest (SROI) is a sub-region of ROI. The SROI is smaller in the image frames which can reduce the time to compute the SROI. It is the facilitating real-time process of Mosquito. In the proposed technique, it has been demonstrated image sequences of moving or flying Mosquito for detection and position tacking.
Volume: 12
Issue: 11
Page: 7798-7807
Publish at: 2014-11-01

An Improved Tone Reservation Scheme in OFDM Systems for Adaptive Amplitude Clipping

10.11591/ijeecs.v12.i11.pp7758-7763
Yang Song , Chaoshi Cai , Jianping Li
Orthogonal frequency division multiplexing(OFDM) suffers from a high peak to average power ratio(PAPR).  Tone reservation (TR) technology is considered as one of the most promising methods because of no additional distortion, no side information, and low implementation cost. However, in all PAPR reduction schemes，determining the optimal target clipping level is difficult. In this paper, we consider an adaptive amplitude least squares approximation(AALAS-TR) algorithm. Adjust adaptive optimal convergence factor for initial clipping threshold. That is results an approximately PAPR reduction performance with a low computational complexity. Simulation results show that the proposed algorithm can achieve better PAPR reduction as that different clipping threshold .
Volume: 12
Issue: 11
Page: 7758-7763
Publish at: 2014-11-01

Fault Diagnosis of Tuning Area Based on Wavelet Neural Network

10.11591/ijeecs.v12.i11.pp7854-7862
Yu Dong , Ya-lan Li , Jie-long Nan
With the rapid development of china railway, ZPW-2000A track circuit has been widely used. Tuning area, which is an important part of the ZPW-2000A track circuit, is not only the relationship between the signal transmission quality, and determine the effect of electrical insulation between adjacent sections. Therefore, the study of fault diagnosis aspects for tuning area is urgent and significant. In this paper, using the theory of transmission line a model of track circuit is built, the comparison of the actual data and experimental data of the track surface voltage envelope curve shows the correctness of this model. Owning to the good time-frequency characteristics of wavelet and the nonlinear mapping features of neural network, a fault diagnosis of ZPW-2000A tuning area based on the wavelet neural network(WNN) is proposed. Combined with the practical failure situation of railway site, the fault diagnosis method in this paper can accurately identify failure modes of tuning area.
Volume: 12
Issue: 11
Page: 7854-7862
Publish at: 2014-11-01

Direct Radio Frequency Sampling System on Software-defined Radio

10.11591/ijeecs.v12.i11.pp7824-7831
Luo Junyi , Lei Lin , Chen Eryang , Zhao Yongxin
A traditional assumption underlying most data converters is that the signal should be sampled at a rate exceeding twice the highest frequency. In this paper, we employ a method for low-rate sampling of multi- band signals via applying periodic nonuniform sampling in shift-invariant spaces generated by m kernels with period T. So, the sampling and reconstruction of signals were transformed into matrix and vector operations, the generalized inverse can be use to find the answer and an interpolator is used to insure that complete reconstruction will be achieved. Finally, we validate the method in MATLAB; the conclusion of simulation shows the frame-work presented here is feasible.
Volume: 12
Issue: 11
Page: 7824-7831
Publish at: 2014-11-01
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