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23,675 Article Results

An Improved Variable-Frequency Drive Based on Current Tracking

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2816
Zhiwei He , Guangyan Zhou , Mingyu Gao
Variable frequency devices are widely used in many power systems. A current tracking based VFD is proposed in this paper. The output current is firstly fed back and compared with a standard sine wave, the difference of them is then used for a PI regulator to control the PWM signal, so as to change the output current accordingly to make it approach the standard sine wave. Simulation and experiments results show that the current tracking VFD not only has a fast dynamic response, high current tracking precision, current limiting ability, but also has small distortion of the output sine wave current and low loss of the motor. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3508 
Volume: 11
Issue: 11
Page: 6631-6636
Publish at: 2013-11-01

A Fault Area Location Method in Distribution Network With DG

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2848
Zhongjian Kang , Aina Tian , Zhe Bai
To precisely locate the grounded fault area in distribution network with DG, a new grounded fault area location algorithm based on three-phase impedance model and fault features in distribution network with DG is proposed in this paper. This method establishes three-phase impedance model if the distribution network with DG, analyzes and extracts the fault characteristics on the basis of the three phase impedance model of distribution network with DG. According to the characteristic of the feature value in the fault point, this method traverses all the nodes and gets the fault associated nodes. The method proposed in this paper was tested in a sixty nodal distribution system with six DGs, the result of the method verifies that the method can precisely locate the grounded fault area in distribution network with DG. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3548 
Volume: 11
Issue: 11
Page: 6870-6878
Publish at: 2013-11-01

Safety Voting System Based on D-S Evidence Theory

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2818
Yue Xi , Feng Liu , Hongli Yuan , Dongbo Pan
This thesis proposes a safety instrument system which is based on D-S evidence theory, including sensor, logic voting system and execution unit. While the logic voting system concludes the input circuit, processor, output circuit and the diagnosis module based on D-S evidence theory. According to the diagnosis module in multi-channel logic voting system and calculation based on D-S evidence theory, the interconnected feedback information can improve the reliability of the diagnosis. Therefore, the safety instrument system elaborated in this thesis can achieve system’s self-diagnosis function under the premise of using less hardware equipment and at the mean time acquiring advantages of low cost, reliability and high security. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3510  
Volume: 11
Issue: 11
Page: 6645-6650
Publish at: 2013-11-01

Study on Control Strategies for the Multilevel Cascaded Converters

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2775
Lin Xu , Yang Han
The multilevel cascaded converters are extensively applied for high-voltage and high-power applications, which are considered as the most favorable topologies for the high power ac-drives and the high-voltage DC transmission (HVDC) systems using the voltage source converters (VSCs). This paper presents the dc capacitor balancing and effective current regulation methodologies for the multilevel cascaded converters. The dc-link voltage balancing and capacitor energy evolving mechanism of the MMCC is analyzed, and an effective control scheme is devised by utilizing two dc capacitor voltage control loops, including the total capacitor voltage controller (TCVC), the capacitor voltage balancing controller (CVBC). The predictive current controller is proposed to enhance the tracking accuracy of current control loop. The proportional-resonant controller (PRC) is used as circulating current damping controller of the modular multilevel converter, which is found to be highly effective to minimize the circulating current. The Electromagnetic Transient Program (EMTP) is utilized for digital simulation of the single-phase five-level modular multilevel converter. The effectiveness of the control scheme is validated by the simulation results. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.2994
Volume: 11
Issue: 11
Page: 6329-6336
Publish at: 2013-11-01

RBF Nerve Network Tuning PD Control Scheme for Tele-operation Robot Servo System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2783
Guang Wen
In the bilateral hydraulic servo control system of a construction tele-robot with in-situ force sensing, the p-f type force feedback architecture is liable to result in an impact on the operator hand, and its high amplitude will cause the control unstable. In order to solve this problem an improved force feedback control method with the feature of a T-S fuzzy feedback coefficient, which could be modified online nonlinearly and continuously, is proposed. And a RBF-PID force controller is also designed, and formed a bilateral hydraulic servo control system. The experimental results indicate that the new improved control method reduced the impact of the feedback force, the compliance and transparency of the tele-operation of construction tele-robot system are enhanced. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.2731
Volume: 11
Issue: 11
Page: 6390-6399
Publish at: 2013-11-01

Researching of Image Compression Based on Quantum BP Network

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2850
Yang Ran , Zuo Yanjun , Lei Wanjun
The encoding time of traditional fractal image coding method is too long.Aiming at this problem, a quantum BP network algorithm is proposed in the paper. By using a neuronal model with quantum input and output, combined with the theory of BP in image compression and the complex BP algorithm, a model for image impression with 3-layer quantum BP is built, which implements image compression and image reconstruction. The simulation results show that QBP can obtain the reconstructed images with better quantity compared with BP in spite of the less learning iterations. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3550
Volume: 11
Issue: 11
Page: 6889-6896
Publish at: 2013-11-01

A Resource Scheduling Strategy in Cloud Computing Based on Multi-agent Genetic Algorithm

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2807
Wuxue Jiang , Jing Zhang , Junhuai Li , Hui Hu
Resource scheduling strategies in cloud computing are used either to improve system operating efficiency, or to improve user satisfaction. This paper presents an integrated scheduling strategy considering both resources credibility and user satisfaction. It takes user satisfaction as objective function and resources credibility as a part of the user satisfaction, and realizes optimal scheduling by using genetic algorithm. We integrate this scheduling strategy into Agent subsequently and propose a cloud computing system architecture based on Multi-agent. The numerical results show that this scheduling strategy improves not only the system operating efficiency, but also the user satisfaction. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3497 
Volume: 11
Issue: 11
Page: 6563-6569
Publish at: 2013-11-01

Routing Optimization for Wireless Sensor Network Based on Cloud Adaptive Particle Swarm Optimization Algorithm

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2796
Xu Bao
One of the most important targets of routing algorithm for Wireless Sensor Network (WSN) is to prolong the network lifetime. Aimed at the features of WSN, a new routing optimization approach based on cloud adaptive particle swarm optimization algorithm is put forward in this paper. All paths appear at the same time in one round are fused in one particle, and the coding rule of particle is set down. The particle itself is defined as its position, the number of replaceable relay nodes in paths is defined as the velocity of particle. Cloud algorithm is used to optimize the inertia weight of particle. Optimize rules are laid out, and both residual energy of nodes and variance of all paths’ length are considered in objective function. Simulations find out the best value of balance factor in objective function, also prove that this approach can control the energy consumption of network, enhance the viability of nodes, and prolong the lifetime of network. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3486
Volume: 11
Issue: 11
Page: 6484-6490
Publish at: 2013-11-01

Nondestructive Testing of Wood Defects Based on Stress Wave Technology

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2839
Wenshu Lin , Jinzhuo Wu
The wood samples were tested by the technique of stress wave, and the testing results were analyzed by using the statistic software of SPSS. The results showed that the length, density and knots of wood, the sizes of holes and numbers of holes have significant influence on propagation parameters and dynamic modulus of elasticity. Under the same specifications, the propagation time of the stress wave was longer in the wood with holes than the perfect wood samples, and the time become longer with the increasing the sizes and numbers of holes. The studying results of this paper will provide a sound background for the application of stress-wave technique in detecting the inner defects of wood products and other wooden structures. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3532
Volume: 11
Issue: 11
Page: 6802-6807
Publish at: 2013-11-01

Research on Hollow Inclusion Strain Sensors with Temperature Compensation Employed for In-situ Stress Monitor Network

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2770
Qifeng Guo , Fenhua Ren , Haoran Guo , Liang Zhao , Zhenxiong Yan
The hollow inclusion strain sensors employed for in-situ stress monitor use strain gages to detect strain changes of the rock, and the detected strain changes are transmitted to resistance changes in a Whetstone bridge, then the output voltage values of the bridge are finally used for in-situ stress calculation. In order to correct the temperature influence on the strain gages, thermistors are used to record the temperature changes during the monitor and achieve the temperature compensation. A monitor network containing 9 hollow inclusion strain sensors with temperature compensation were built to measure the in-situ stress in an undersea mine, and the measuring results discover the distribution law of 3D in-situ stress state in the mine which can be used to optimize the mining design. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.2948
Volume: 11
Issue: 11
Page: 6296-6303
Publish at: 2013-11-01

Vector Control of Four Switch Three-Phase Inverter Fed Synchronous Reluctance Motor Drive Including Saturation and Iron Losses Effects Based Maximum Torque Control

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2777
M. K. Metwally , Mahrous Elsamman Ahmed
This paper presents a cost-effective vector control strategy for four switch three phase (FSTP) inverter fed a synchronous reluctance motor with conventional rotor (SynRM) drive. The reduction of the number of power switches from six to four improves the cost-effectiveness, volume-compactness and reliability of the three phase inverters. In this paper, a simulation model of the drive system is developed and analyzed in order to verify the effectiveness of the approach. The application of vector control to a SynRM at maximum torque control (MTC) operation is presented with emphasis on the effects of saturation and iron losses are briefly considered. A PI controller is used to process the speed error. Two independent hysteresis current controllers with a suitable hysteresis band are utilized for inverter switches signals. A simplified steady-state d-q model including saturation and iron losses is presented. Simulation results show that the drive system provides a fast speed response and good disturbance rejection capability. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3366
Volume: 11
Issue: 11
Page: 6344-6351
Publish at: 2013-11-01

Heterogeneous Sequence Node of Associated Coverage Algorithm in Wireless Sensor Network

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2802
Zeyu Sun , Zhaohui Chen
In the premise of meeting the quality of network service, how to effectively cover the monitoring area and how to prolong the network lifetime has become one of the wireless sensor network researches. Therefore, this paper proposes heterogeneous nodes based on association covering algorithm. On one hand, this algorithm is handled through the Poisson model of structure joint probability density formula and it is also based on the node density formula to establish sensor node in the monitoring area in order to efficiently cover the focused target. On the other hand, it updates through the node's own state scheduling mechanism and converts neighbor nodes dynamically about matching scheduling, which can balance the monitoring area sensor node residual energy and node energy consumption. Therefore it can achieve the purpose of prolonging network lifetime .Finally, the simulation results show that the algorithm not only can use fewer nodes to effectively cover the monitoring area completely and improve the coverage of the network but also can optimize resource allocation and prolong the network lifetime. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3492
Volume: 11
Issue: 11
Page: 6527-6533
Publish at: 2013-11-01

Strategies and Techniques for Data Compression in Wireless Sensor Networks

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2815
Wei Song
The major challenge in designing wireless sensor networks (WSNs) is to resolve the limitation of energy and transmission capacity.  Data compression, as an effective solution, is attracted many attentions. In this paper, a survey is done on the strategies and techniques for data compression in WSNs. And the data compression schemes are divided into two classes: classical methods and the potential technique based on compressed sensing. The basic procedures of each method are further analyzed, and the existing problems are also highlighted. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3507  
Volume: 11
Issue: 11
Page: 6624-6630
Publish at: 2013-11-01

Study of Multi-source Fusion B2C Business Process Reengineering of the Petri net Model

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2834
Feng Tian
In order to fuse a multi-source B2C E-commerce system, this paper implements a new multi-source fusion B2C mode business system application development, which can provide customers with efficient and reliable comparison and cross-platform business system of choose and buy goods. By analyzing the Multi-source fusion B2C E-commerce system demand of business process reengineering and Petri net theory, the B2C electronic commerce system of multi-source fusion structure is proposed, graphical workflow modeling methods is adopted, the multi-source fusion of B2C business process reengineering Petri model is established, with the help of CPNtool simulation system and the establishment of correlation matrix analysis of the model. The experimental simulation analysis and output of experimental reports indicate that the business processes are properly designed, no deadlocks node exist at runtime, accessibility meets which provides the reference model for the development of multi-source fusion of B2C electronic commerce system.  DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3526
Volume: 11
Issue: 11
Page: 6762-6768
Publish at: 2013-11-01

Real-time Moving Object Tracking System Using Cam-shift Algorithm

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2813
Wei Song
A real-time tracking system with the ability of tracking the moving target using cam-shift algorithm is designed. The basic technique of the stereo vision system is discussed. The architecture, the hardware component and the interface of the tracking system is analyzed. Two digital cameras are fit on the cradle head, and the electric pan/tilt/zoom controller has two independent degrees of freedom: horizontal rotation and pitch. The video signals are captured by two digital cameras, and then the position of the target is calculated. The electric pan/tilt/zoom controller is moved in order to make the target always in the surveillance window. This active system extends vision coverage over wide areas to get more detail information.  DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3505
Volume: 11
Issue: 11
Page: 6611-6617
Publish at: 2013-11-01
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