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TELKOMNIKA Indonesian Journal of Electrical Engineering
ISSN : 23024046     EISSN : 2087278X     DOI : -
TELKOMNIKA Indonesian Journal of Electrical Engineering (ISSN: 2302-4046, e-ISSN: 2087-278X, a Ei Compendex Indexed journal) is a monthly peer reviewed International Journal in English. The aim of this journal is to publish high-quality articles dedicated to all aspects of the latest outstanding developments in the field of electrical engineering. Its scope encompasses the applications of Telecommunication and Information Technology, Applied Computing and Computer, Instrumentation and Control, Electrical (Power), and Electronics Engineering.
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Articles 90 Documents
Search results for , issue " Vol 11, No 8: August 2013" : 90 Documents clear
SOC EKF Estimation based on a Second-order LiFePO4 Battery Model Zhu, Zheng; Sun, Wei Jin; Rong, Yongbing; Liu, Dan
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 11, No 8: August 2013
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v11i8.2629

Abstract

An accurate battery State of Charge (SOC) estimation has great significance in improving battery life and vehicle performance. An improved second-order battery model is proposed in this paper through quantities of LiFePO4 battery experiments. The parameters of the model were acquired by the HPPC composite pulse condition under different temperature, charging and discharging rates, SOC. Based on the model, battery SOC is estimated by Extended Kalman Filter (EKF). Comparison of three different pulse conditions shows that the average error of SOC estimation of this algorithm is about 4.2%. The improved model is able to reflect the dynamic performance of batteries suitably, and the SOC estimation algorithm is provided with higher accuracy and better dynamic adaptability.
Research on coordinate transformation of the three-phase circuit Xing, Tian Ming; hong, yan; Sheng, Yuan Dong
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 11, No 8: August 2013
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v11i8.2268

Abstract

The different three-phase circuit coordinate transformation matrixes are given in relevant literatures , which may cause some difficulties to understand and apply the coordinate transformation. The paper presents a general expression of the coordinate transformation matrixes in three-phase circuit and points out that the coordinate transformation matrixes having different specific expressions are due to existing the parameters which can be selected in the general expression. On this basis, the three often used expressions of coordinate transformation matrixes rotating at arbitrary speed are obtained through selecting these different parameters, which are Park transformation, orthogonal transformation and the coordinate transformation in the theory of instantaneous power. The paper further points out that, through particularly choosing coordinate rotation speed ,it can get commonly used special coordinate transformation matrixes between the three-phase stationary coordinate systems, and between the stationary coordinate system and synchronous rotating coordinate system by matrix general expression. The work of this paper shows that the three-phase circuit coordinate transformation matrixes are essentially uniformed, though their forms and practical applications are different, which is helpful to further understanding and correctly using the coordinate transformation theory of three-phase circuit.
Harmonic Characteristic Analysis of Magnetically Saturation Controlled Reactor Xing, Tian Ming; Sheng, Yuan Dong; Hong, Yan
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 11, No 8: August 2013
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v11i8.2276

Abstract

As the magnetically saturation controlled reactor’s (MSCR) operation is based on the saturation characteristic of the core, so its harmonic characteristic should be valued. According to the structural characteristic and working principle, the mathematical model of MSCR is derived. And the harmonic components of physical quantities such as current, voltage and magnetic field parameters are analyzed by function characteristic analysis. Then, it concludes that MSCR’s working current is an odd harmonic function, containing fundamental and odd harmonic components; controlling current and voltage are even harmonic functions, containing DC and even harmonic components; the core flux linkage, flux, magnetic field intensity and magnetic field density are just containing DC and fundamental components. At last, a simulation model for MSCR is fabricated with MATLAB/Simulink, the simulation results show that the paper’s analysis and conclusions are accurate. So, this paper can provide a reference to further analysis and proposition of new harmonic suppression methods of MSCR.
Automobile Transmission Shift Control Based on MMAS and BP Networks Chen, Jianxue
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 11, No 8: August 2013
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v11i8.2417

Abstract

The neural network control model of automobile automatic transmission has been developed, which make the optimum shift decision based on the vehicle velocity, the vehicle acceleration and the throttle opening. The MAX-MIN ant syste (MMAS) is introduced to train the neural network weights and thresholds. The basic theory and steps of MMAS algorithm are given, and applied in the automatic transmission shift control. Experimental results show that the automatic transmission shift control system based on MMAS, comparing to the system based on ACO-BP, has better capability of gear recognition, and can make shift decision promptly and effectively.
Voltage and Reactive Power Control of Front-end Speed Controlled Wind Turbine via H∞ Strategy Dong, Haiying; Li, Shuaibing; Cao, Lixin; Li, Hongwei
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 11, No 8: August 2013
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v11i8.2423

Abstract

According to the characteristics like rapidity, time variability and the uncertainty of the input mechanical torque of the front-end speed control wind turbine (FSCWT) with directly grid-connected electrically excited synchronous generator (EESG), a double-loop H∞ control approach was proposed. In which, a simpilified structure of brushless excitation system was used. For the inner loop, first H∞ excitation controller was designed for realizing a fast excitation control; the second H∞ power system stabilizer (PSS) was designed by solving the Riccati equation for the purpose of eliminating the oscillation and desynchronization of generator may caused by fast excitation and improving the system transient stability, which ensured the generator with stable operation in grid-connecting and effectively solved the contradiction between fast excitation and transient stability. Then the designed H∞ controllers were applied to the voltage and reactive power control system (VRCS), which realized the output voltage and reactive power control requriements by tuning the weighting functions. Simulation results show that the double-loop H∞ control approach was more effective than the single H∞ excitation control in voltage and reactive power control of FSCWT.
Outage Performance Based on Optimal Relay Location in Multi-node Relay Network Song, Yaolian; Shao, Yubin; Long, Hua; Xi, Xuanhui
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 11, No 8: August 2013
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v11i8.2742

Abstract

In this paper, we investigate the outage performance of multi-node relay network under equal power allocation (EPA) scheme. Due to the mobility of relay nodes, we proposed to design a method that considers random relay location based on random model. We conduct deep experiments which demonstrate that there exists optimal relay location to minimize the outage probability of multi-node relay networks. Finally, simulation results show that the outage performance of the multi-node relay network is closely related to the relay location.  
Energy Efficiency Maximization Based on Cooperative sensing in Cognitive Relay Networks Song, Yaolian; Feng, Guangzeng; Xi, Xuanhui
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 11, No 8: August 2013
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v11i8.2446

Abstract

In this paper, we investigate the energy efficiency maximization problem of cognitive radio systems. We propose to study energy efficiency of cognitive relay transmission scheme based on cooperative spectrum sensing, since empirical studies have shown that optimal sensing time and transmit power are key factors for energy efficiency maximization. We design a method that simultaneously considers the parameters of spectrum sensing time and transmit power. Finally, we conduct deep experiments which show that our proposed approach can significantly improve the throughput and energy efficiency than the non-cooperative spectrum sensing method.
Backstepping Adaptive Fuzzy Scheme for SCARA GRB400 Robot Qiao, Wei Yong
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 11, No 8: August 2013
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v11i8.2634

Abstract

In order to achieve the accurate trajectory tracking of 2 degree-of –freedom robot, a backstepping adaptive fuzzy control scheme based on Lyapunov method, is presented for the SCARA (Selective Compliance Assembly Robot Arm) robot system. The control strategy consists of the traditional backstepping control and adaptive fuzzy control to cope with the model unknown and parameter disturbances. The system is modeled using the MATLAB-SIMULINK toolbox. The simulation is presented to verify the effectiveness of the proposed control scheme. From the simulation results, fast response, strong robustness, good disturbance rejection capability and good angle tracking capability can be obtained. The output tracking error between the actual position output and the desired position output can asymptotically converge to zero. It is also revealed from simulation results that the proposed control strategy is valid and effective for the SCARA robot system.
Intrusion detection system and technology of layered wireless sensor network based on Agent Yu, Genjian; Weng, Kunpeng
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 11, No 8: August 2013
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v11i8.2347

Abstract

The intrusion detection system and technology of classified layered-wireless sensor network was able to meet the high safety requirements of wireless sensor network, it is urgent for us to improve the identification and generalization of detection system about characters of intrusion. In this paper, we design an intelligent intrusion detection system which realize intelligence, the effective and direct way was to add the methods,  and it was used for identification and generalization of intrusion characters to the Agent function of intrusion detection. It could obtain credible judgment by updating and examining the database for the actions which the general misuse detection or anomaly detection were not sure if the intrusion was formed.
Removal of Atmospheric Particles in Poor Visibility Outdoor Images Al-Zubaidy, Yaseen; Abdul Salam, Rosalina
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 11, No 8: August 2013
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v11i8.2872

Abstract

The visibility of a scene is degraded by weather phenomena such as rain drizzle, fog and haze. The degradation of image scene is due the substantial presence of particles in the atmosphere that scatter and absorb light. As the light spreads from object to the observer, the color and intensity is changed by the atmospheric particles. In this research, we suggest new methods to precisely detect airlight and correctly estimate the atmospheric veil from image that captured in bad weather. The result of suggested methods will be used in scattering atmospheric model to remove atmospheric particles namely, rain drizzle, fog and haze from a single image. Therefore a higher visibility image will be produced.