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23,598 Article Results

Power Electronics Converters for Variable Speed Pump Storage

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4933
Othman Hassan Abdalla , Minxiao Han
This paper proposed the power electronics solution to obtain variable speed of the variable-speed pump storage The study focused on the types of variable-speed pump storage consists of doubly fed asynchronous machine and power electronics converter. Power Electronics converters used in this model are cycloconverter, two levels, three levels voltage source- converter and H-bridge cascaded eleven levels converters. The total harmonic distortions of rotor currents of Doubly fed asychronous machine and speed change for each type of converters are analyzed. Study explained the H-bridge eleven level converter is the best solution than other types.All simulation models depended on the used of PSIM software program.DOI: http://dx.doi.org/10.11591/ijpeds.v3i1.1726
Volume: 3
Issue: 1
Page: 74-82
Publish at: 2013-03-01

A Novel Realization of Three-D Rounding Photography System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2093
HUANG Jun-sheng , HOU Zhen-jie , ZHANG Jian-hua
Three-D rounding photography system is an application of Desktop Virtual Reality. It takes the pictures around the objects with the computer, and then deasl with them for the 360 degree display in the local computer or a web page. The Three-D visual sense and image real-time amplification of this system are the key technical problems. This paper researches on this system and proposes a new solution based on the Silverlight technology togher withan improved triangle internal interpolation method based on the barycentric coordinates properties for the image real-time amplification.The experimental results show that the solution meets the visual sense and interaction Requirements of the Three-D Rounding Photography system. And the improved algorithm reduces the operation time efficiently, thus it has some practical value. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2205
Volume: 11
Issue: 3
Page: 1284-1289
Publish at: 2013-03-01

Study on Practical Issues for the State Estimation of the Automatic Voltage Control (AVC) System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2144
Lin Xu
The state estimation is an important part of the automatic voltage control (AVC) system, and it is the basis of the advanced software application for the electric power systems (EPSs). This paper presents the status quo of the current state estimation mathematical model and the actual grid state estimation applications. The actual AVC system network modeling and model validation, pre-processing and other related issues are discussed, and the methods for detection and identification of bad data are presented. Besides, the debugging method of state estimation for enhancing practical pass-rate is proposed. Finally, the state estimation of the actual system is validated, and the results show that the state pass-rate is more than 99%, which has important significance for the AVC control practitioners and power flow dispatchers.DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2256
Volume: 11
Issue: 3
Page: 1714-1720
Publish at: 2013-03-01

A Dynamic Key Management Scheme Based on Secret Sharing for Hierarchical Wireless Sensor Networks

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2120
Enjian Bai , Xueqin Jiang
Since wireless sensor networks (WSN for short) are often deployed in hostile environments in many applications, security becomes one of the critical issues in WSN. Moreover, due to the limitation of the sensor nodes, traditional key management schemes are not suitable for it. Thereby,a feasible and efficient key management scheme is an important guarantee for WSN to communicate securely. For the moment, many protocols have been proposed and each has its own advantages. However, these protocols cannot provide sufficient security in many cases, such as node capture attack, which makes WSN more vulnerable than traditional wireless networks. Key protection and revocation issues must be considered with special attention in WSN. To address these two issues, we propose a dynamically clustering key management scheme based on secret sharing for WSN. The scheme combined the hierarchical structure of wireless sensor networks with dynamic key management scheme. The analysis results show that the scheme has strong security and resistance of captured attack, as well as low communicational overhead, and it well meets the requirement of scalability. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2300
Volume: 11
Issue: 3
Page: 1514-1523
Publish at: 2013-03-01

Design of Interference Measurement System with Crystal

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2123
Shuyan Ren , Yonggang Yang , Hailong Duan
A kind of interference measurement system with crystal is designed, which is not influenced much by other factors such as vibration for the property of common path. For the distance measurement, the phase of fringes is calculated on the oblique incident holography to avoid effects of fringe curvature, backup and light fluctuation. But the measurement result is affected by the uniformity of the crystal, and another method of adjusting position based on normal incident holography is also discussed. B-splines function is used to calculate zero position in normal incident holography, which is fitted over the patch image around gray extreme points of the stripes obtained by gray projection. Experiment results show that combining the normal and oblique incident holography reduce the repeatability error of the system and improve the measurement precision effectively. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2303
Volume: 11
Issue: 3
Page: 1540-1546
Publish at: 2013-03-01

Single-Phase Single-Stage PV-Grid System Using VSI Based on Simple Control Circuit

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4927
Slamet Riyadi
Integrating electric energy generated by PV with utilities has been developed. Some of these using two-stage converters and the others using single stage converters. For systems with two-stage converters, the first stage converter acts as a MPPT to maximize power generated by PV and the second stage is used as an interface to the utilities. In the single-stage system, an inverter is used for both function. In this paper, PV-Grid System using a single-stage Voltage Source Inverter is proposed. The simple control circuit to make PV generate maximum power and keeping power equilibrium between PV and inverter output power is used. To verify the analysis, simulations are done.DOI: http://dx.doi.org/10.11591/ijpeds.v3i1.1860
Volume: 3
Issue: 1
Page: 9-16
Publish at: 2013-03-01

Information Extraction from Research Papers based on Conditional Random Field Model

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2084
Zhu Shuxin , Xie Zhonghong , Chen Yuehong
With the increasing use of CiteSeer academic search engines, the accuracy of such systems has become more and more important. The paper adopts the improved particle swarm optimization algorithm for training conditional random field model and applies it into the research papers’ title and citation retrieval. The improved particl swarm optimization algorithm  brings the particle swarm aggregation to prevent particle swarm from being plunged into local convergence too early, and uses the linear inertia factor and learning factor to update particle rate. It can control algorithm in infinite iteration by the iteration between particle relative position change rate. The results of which using the standard research papers’ heads and references to evaluate the trained conditional random field model shows that compared with traditionally conditional random field model and Hidden Markov Model, the conditional random field model ,optimized and trained by improved particle swarm, has been better ameliorated in the aspect of F1 mean error and word error rate. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2188
Volume: 11
Issue: 3
Page: 1213-1220
Publish at: 2013-03-01

The Establishment of Field Intensity Model of Wireless Telemetry Signal in Man-made Forests

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2082
Yun-Jie Xu , Wei Zhang
On the basis of the configuration characteristics of man-made forests, the spread model of wireless sensor signal in man-made forests has been simplified according to electromagnetic wave theory and Fermat principle. The man-made forests is decomposed into independent medium with four layers, the spread model is simplified into free space model, attenuation screen model and absorption screen model. The field intensity calculation formulas of UHF frequency range attenuation screen and absorption screen has been discussed, which provides basis for optimization layout of sensor and offers theoretical basis of other radio frequency communication research in man-made forests. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2186
Volume: 11
Issue: 3
Page: 1197-1204
Publish at: 2013-03-01

A Multilevel Inverter Based on SVPWM Technique for Photovoltaic Application.

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4932
Shantanu Chatterjee
Multilevel inverters can reach the increasing demand for power quality and power ratings along with lower harmonic distortion and lesser electromagnetic interference (EMI). As the number of levels increases, it is important to control more switches in parallel with their concurrent processing capability. In this paper space vector pulse width modulation (SVPWM) Technique is proposed for the two-level and three-level neutral point clamped (NPC) inverter. Due to the geometrical symmetry of six sectors, there will be close relationship between on-time arrangements and on-time calculations for switches respectively. The two and three level inverter is simulated using MATLAB/Simulink and also the experimental results are presented for verifying the effectiveness of the system. The use of Photovoltaic Cell as source for the NPC Inverter is proposed here in this paper.DOI: http://dx.doi.org/10.11591/ijpeds.v2i4.403
Volume: 3
Issue: 1
Page: 62-73
Publish at: 2013-03-01

SVR-based RPD approach for complex processes and its application in circuit optimization

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2114
Cui Qing’an , Zhang Yuxue , Cui Nan , Liu Huihua
During the lifespan of electronic products, the output voltage and current fluctuate due to the random fluctuations of parameter values of circuit components and environmental noise. Extant methods of circuit designs, such as parameter sweep and sensitivity analysis, are hard to obtain global robust optimization of output characteristics. This paper proposes a SVR-based robust parameter design approach to reach global circuit optimization. First, the approach fits an empirical model of process responses by using SVR. Next, it introduces the fluctuations of controllable factor variations and noise factors into response model by probability density functions, and calculates process means and variances by integration. Finally, it obtains optimal parameter combination by model optimization. An empirical study of the robust design of an inductor-resistor series circuit is conducted. The results show that the proposed approach not only avoids the disadvantage of ignoring interactions between factors when using parameter sweep and sensitivity analysis, but also overcomes the shortcoming of only achieving non-continuous optimization by Taguchi method and the limitation of obtaining local optimization by DRSM, and therefore, enhances the robustness of the circuit outputs. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2228
Volume: 11
Issue: 3
Page: 1465-1472
Publish at: 2013-03-01

Study of Real-Time Slope Stability Monitoring System Using Wireless Sensor Network(WSN)

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2116
Dave Ta Teh Chang , Yuh-Show Tsai , Kai-Chun Yang
Traditional monitoring instruments have been found difficult to meet the requirement for real-time monitoring. This study applied Wireless Sensor Network (WSN) to slope stability monitoring, In recent years, the slopes in Taiwan have frequently caused disasters after heavy rains, and traand understand the process of slope instability from the characterization variation of new concepts. In the first stage, the Mems Sensors were selected and calibrated, and the accuracy was selected as 0.1 。and 0.5。. The self-made tilt calibration apparatus was used to calibrate the accuracy of 33 Mems Sensors respectively placed on the side slope. The stability and repeatability were validated multiple times. The field monitoring was carried out at the second stage. National Highway No. 3 3K+100 and TW PHW62 were selected at test locations, and 23 and 10 sensors were placed at these locations respectively. The data were collected in the in-situ industrial computer, and were transmitted via 3G wireless network card to the remote management unit as the basis of monitoring side slope. This study is now at the overall distribution stage, hoping to use the wireless sensor technology to develop an effective, real-time and energy-saving environmental monitoring system and management platform, so as to construct an intelligent WSN early warning and reporting system, which can be applied to the slope disaster prevention engineering. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2230
Volume: 11
Issue: 3
Page: 1478-1488
Publish at: 2013-03-01

Design of Feedback Controller for Boost Converter Using Optimization Technique

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4937
Sesha Giri Rao Galam , S. Raghu , N. Rajasekaran
In this paper a new method of controller design for boost type dc-dc converter is proposed. A feedback controller for DC-DC boost converter is designed to obtain constant output voltage of 24v.The optimal values of feedback controller is obtained using Genetic Algorithm (GA). Design equations are derived and it is modeled in MATLAB. Extensive simulation is carried out with linear controller parameters and the results are presented. To compare the output of the GA based design and BFOA, the controller parameters are also determined using conventional method (Z-N). Simulation results are validated through hardware results. DOI: http://dx.doi.org/10.11591/ijpeds.v3i1.1737
Volume: 3
Issue: 1
Page: 117-128
Publish at: 2013-03-01

Efficient RFID Data Cleaning Method

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2143
Li Xing , FU Wen-xiu
RFID (Radio Frequency Identification) technology transfers data between movable tagged objects and readers without line of sight, and the captured data tends to be noisy. The inherent unreliability makes the data unreliable to application. Nowadays, the main solution is to use sliding window, but it is difficult to decide the window size, especially when the tag moves frequently or with high false positive. To solve the mentioned problems, SWKF (Sliding Window based on Kalman Filter Pre-processing) is proposed. It preprocesses the RFID data to make the read rate close to the real one, detects and filters the mobile tags. Then, the preprocessed data is smoothed to further improve accuracy. At the same time, the mid-window slide point reduces the output. Through the combination of Kalman Filter and sliding window, SWKF provides accurate RFID data to application. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2154
Volume: 11
Issue: 3
Page: 1707-1713
Publish at: 2013-03-01

Novel AZSPWM Algorithms based VCIMD for Reduced CMV Variations

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4926
Kola Satya Narayana , A. Kailasa Rao , K. Satyanarayana
Novel AZSPWM algorithms based on the concept of imaginary switching times (IST) are presented in this paper for vector controlled induction motor drive to reduce the common mode voltage (CMV) variations. The proposed algorithms did not use the information of angle and sector and hence reduces the complexity involved in the conventional space vector PWM (CSVPWM) approach. The proposed AZSPWM algorithms did not use zero voltage vectors and involves utilizing the two adjacent voltage vectors along with two opposing active voltage vectors with equal duty cycle to provide cancellation and create an effective zero state. Moreover, these algorithms are developed based on the concept of imaginary switching times, the computational burden involved in the conventional algorithms can be decreased. To verify these algorithms, numerical simulation studies have been carried out and results are presented and compared with the CSVPWM algorithm.DOI: http://dx.doi.org/10.11591/ijpeds.v3i1.1337
Volume: 3
Issue: 1
Page: 1-8
Publish at: 2013-03-01

Sulfur Dioxide Emission Combination Prediction Model of China Thermal Power Industry

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2077
Zhou Jianguo , Zhang Fen
The prediction of regional sulfur dioxide (SO2) emission of thermal power belongs to gray system which has small amounts of samples and little information, so a appropriate forecasting method is essential. Based on thermal power industry SO2 emission data from state department authorities, considering the main factors of China's thermal power industry SO2 predicted emission, we established a combination prediction model connecting gray prediction model with BP neural network model to predict SO2 emission, and we get more satisfied prediction. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2181
Volume: 11
Issue: 3
Page: 1157-1165
Publish at: 2013-03-01
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