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25,002 Article Results

Optimization of an Intelligent Controller for an Unmanned Underwater Vehicle

10.12928/telkomnika.v9i2.695
Amrul; 1University of Muhammadiyah Malang Faruq , Shahrum Shah; Universiti Teknologi Malaysia Bin Abdullah , M. Fauzi Nor; Universiti Teknologi Malaysia Shah
 Underwater environment poses a difficult challenge for autonomous underwater navigation. A standard problem of underwater vehicles is to maintain it position at a certain depth in order to perform desired operations. An effective controller is required for this purpose and hence the design of a depth controller for an unmanned underwater vehicle is described in this paper. The control algorithm is simulated by using the marine guidance navigation and control simulator. The project shows a radial basis function metamodel can be used to tune the scaling factors of a fuzzy logic controller. By using offline optimization approach, a comparison between genetic algorithm and metamodeling has been done to minimize the integral square error between the set point and the measured depth of the underwater vehicle. The results showed that it is possible to obtain a reasonably good error using metamodeling approach in much a shorter time compared to the genetic algorithm approach.
Volume: 9
Issue: 2
Page: 245-256
Publish at: 2011-08-01

Induction Heating Process Design Using COMSOL® Multiphysics Software

10.12928/telkomnika.v9i2.704
Didi; Batam Polytechnics Istardi , Andy; Batam Polytechnics Triwinarko
Induction heating is clean environmental heating process due to a non-contact heating process. There is lots of the induction heating type that be used in the home appliance but it is still new technology in Indonesia. The main interesting area of the induction heating design is the efficiency of the usage of energy and choice of the plate material. COMSOL® Multiphysics Software can be used to simulate and estimate the induction heating process. Therefore, the software can be used to design the induction heating process that will have a optimum efficiency. The properties of the induction heating design were also simulated and analyzed such as effect of inductor’s width, inductor’s distance, and conductive plate material. The result was shown that the good design of induction heating must have a short width and distance inductor and used silicon carbide as material plate with high frequency controller. 
Volume: 9
Issue: 2
Page: 327-334
Publish at: 2011-08-01

Adaptive-Fuzzy Controller Based Shunt Active Filter for Power Line Conditioners

10.12928/telkomnika.v9i2.688
Karuppanan; National Institute of Technology PitchaiVijaya , KamalaKanta; National Institute of Technology Mahapatra
This paper presents a novel Fuzzy Logic Controller (FLC) in conjunction with Phase Locked Loop (PLL) based shunt active filter for Power Line Conditioners (PLCs) to improve the power quality in the distribution system. The active filter is implemented with current controlled Voltage Source Inverter (VSI) for compensating current harmonics and reactive power at the point of common coupling. The VSI gate control switching pulses are derived from proposed Adaptive-Fuzzy-Hysteresis Current Controller (HCC) and this method calculates the hysteresis bandwidth effectively using fuzzy logic.  The bandwidth can be adjusted based on compensation current variation, which is used to optimize the required switching frequency and improves active filter substantially. These shunt active power filter system is investigated and verified under steady and transient-state with non-linear load conditions. This shunt active filter is in compliance with IEEE 519 and IEC 61000-3 recommended harmonic standards.
Volume: 9
Issue: 2
Page: 203-210
Publish at: 2011-08-01

Progress in Artificial Intelligence Techniques: from Brain to Emotion

10.12928/telkomnika.v9i2.729
Tole; Universitas Ahmad Dahlan Sutikno , Mochammad; Universitas Diponegoro Facta , G.R. Arab; University Shahrekord Markadeh
Artificial Intelligence (AI) techniques, e.g. expert system (ES), fuzzy logic (FL), artificial neural network (ANN), genetic algorithm (GA), particle swarm optimization (PSO) and biologically inspired (BI) have recently been applied widely in power electronics and motor drives.Each AI method has its own uniqueness and characteristics. Recently, researchers have developed a computational model of emotional learning in mammalian brain, namely brain emotional learning based intelligent controller (BELBIC). The results indicate the ability of BELBIC to control unknown non-linear dynamic systems. Therefore, the BELBIC can be easily adopted for niche mechatronics and industrial applications.
Volume: 9
Issue: 2
Page: 201-202
Publish at: 2011-08-01

Framework Design of Power Grid Planning and Design Platform

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3443
Tian Tian , Hanghai Hu , Yunfeng Cao , He Hao
Power grid planning and design platform is an integration power grid planning and design and technical-support platform system,serving in power grid companies at all levels and the planning and design unit multistage users for collaborative planning design, comprehensively supporting planning and design basis data management, major network planning, distribution network planning, project planning, planning achievements management and project review. Based on the experience of power grid planning and power grid information construction, an overall architecture design scheme of power grid planning and design platform is presented in this paper. The paper emphasizes the data platform design, and expounds the characteristics of the design platform, which provides the reference and basis for the power grid planning and design platform construction. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.5111
Volume: 12
Issue: 5
Page: 3792-3798
Publish at: 2011-05-01

Curtailed-Gaussian and Cosine Functions for Multihop Doppler Spectrum Modeling

10.12928/telkomnika.v9i1.671
Titiek; Institut Teknologi Sepuluh Nopember Surabaya Suryani , Gamantyo; Institut Teknologi Sepuluh Nopember Surabaya Hendrantoro
            Wireless channels are characterized among others by their Doppler spectrum. In the cooperative diversity, one of diversity branch may consist of several mobile relays forming multihop link which each hop introduced Doppler shift. With employing amplify-and-forward (AF) relays, the Doppler shift keeps accumulating to the end of the link. Doppler shift value affects the time varying channel rate, which is a challenge in broadband mobile communication system. Hence, the Doppler parameter is very important and must be considered in broadband mobile communication system design and analysis. Unfortunately, it is hard to derive the expressions of this Doppler spectrum in a closed form since a special function under integration such as complete elliptic integral exists.  To solve this problem, curve-fitting method base on least-square is used. In this process, curtailed-Gaussian and cosine functions are proposed as an approximation function. Then, from Kullback-Leiber divergence test, it is showed that both proposed functions, i.e., curtailed-Gaussian and cosine functions have a good approximation as Doppler spectrum modeling of Multihop mobile channel with all gain relays assumed as 1 and all mobile terminals are assumed move with almost same velocity.  
Volume: 9
Issue: 1
Page: 73-80
Publish at: 2011-04-01

Partial Discharge Phase Distribution of Palm Oil as Insulating Liquid

10.12928/telkomnika.v9i1.683
Abdul; Andalas University, Bandung Institute of Technology Rajab , Umar K.; Bandung Institute of Technology Umar K. , D. Hamdani; Bandung Institute of Technology D. Hamdani , Aminuddin S.; Bandung Institute of Technology Aminuddin S. , Suwarno; Bandung Institute of Technology Suwarno , Y. Abe; Kyushu Institute of Technology Y. Abe , M. Tsuchie; Kyushu Institute of Technology M. Tsuchie , M. Kozako; Kyushu Institute of Technology M. Kozako , S. Ohtsuka; Kyushu Institute of Technology S. Ohtsuka , M. Hikita; Kyushu Institute of Technology M. Hikita
Due to the low biodegradability level of mineral oil and its susceptibility to the fire, palm oil was proposed as alternative insulating liquid. This paper discusses partial discharge (PD) in palm oil under sinusoidal voltages and the comparison with mineral oil. PD was generated using a needle-plane electrode configuration which is enable enhancing electric field at the needle tip. PD pulses were detected using RC detector and they were measured using a Computer-based partial discharge measurement system. The results showed that PD activities in both oils are similar. The PD was initiated at the negative polarity of applied voltage. The discharges took place in both polarity’s of applied voltage with PD number was higher at negative one. Several discharges phenomena showed the presence of space charge which changed electric field and governed PD activities besides the main field introduced by voltage application.
Volume: 9
Issue: 1
Page: 151-160
Publish at: 2011-04-01

Plastic Ball Grid Array Encapsulation Process Simulation on Rheology Effect

10.12928/telkomnika.v9i1.642
Dadan; Universitas Medan Area Ramdan , Mohd Zulkifly; Universiti Sains Malaysia Abdullah , Khor Chu; Universiti Sains Malaysia Yee
The integrated circuit should be encapsulated for protection from their intended environment. This paper presents the flow visualization of the plastic ball grid array (PBGA) chip encapsulation process considering of the rheology effect. In the molding process, encapsulant flow behavior is modeled by Castro-Macosko viscosity model with considering curing effect and volume of fluid technique is applied for melt front tracking. The viscosity model is written into C language and compiled using User-Defined Functions into the FLUENT analysis. Three types of Epoxy Molding Compound namely case 1, 2, and 3 were utilized for the study of fluid flow inside the mold cavity. The melt front profiles and viscosity versus shear rate for all cases are analyzed and presented. The numerical results are compared with the previous experimental results and found in good conformity. In the present study, case 1 with greater viscosity shows the higher air trap and higher pressure distributions. 
Volume: 9
Issue: 1
Page: 27-36
Publish at: 2011-04-01

Removal of Interferences from Partial Discharge Pulses using Wavelet Transform

10.12928/telkomnika.v9i1.675
Vidya H.A; BNM Institute of Technology Vidya H.A , Bindia; BNM Institute of Technology Tyagi , V Krishnan; BNM Institute of Technology V Krishnan , K. Mallikarjunappa; BNM Institute of Technology K. Mallikarjunappa
 It is essential to detect partial discharge (PD) as a symptom of insulation breakdown in high voltage (HV) applications. However accuracy of such measurement is often degraded due to the existence of noise in the signal. Wavelet Transform (WT) seems to be more suitable than traditional Fourier Transform in analyzing signals with interesting transient information such as partial discharge (PD) signals. In this paper a WT method with soft thresholding is used for signal denoising. PD signals and corona obtained from actual measurements with different voltage magnitudes are processed. Processed signals show the better result. 
Volume: 9
Issue: 1
Page: 107-114
Publish at: 2011-04-01

Efficient Motion Field Interpolation Method for Wyner-Ziv Video Coding

10.12928/telkomnika.v9i1.687
I Made Oka; Universitas Udayana Widyantara , Wirawan; Institut Teknologi Sepuluh Nopember (ITS) Wirawan , Gamantyo; Institut Teknologi Sepuluh Nopember (ITS) Hendrantoro
Wyner-Ziv video coding has the capability to reduce video encoding complexity by shifting motion estimation procedure from encoder to decoder. Amongst many motion estimation methods, expectation maximization algorithm is the most effective one. Unfortunately, the implementation of block-based motion estimation in this algorithm causes motion field profile bounded by granularity of block size. Nearest-neighbor and bilinear interpolation methods have already applied in multiview image coding to handle similar problem. This paper aims to evaluate performance of both interpolation methods in transform-domain Wyner-Ziv video codec. Results showed that bilinear interpolation effective only for high motion video sequences. In this scenario, it has bitrate saving up to 3.29 %, 0.2 dB higher PSNR, and 12.30 % higher decoding complexity compared to nearest-neighbor. In low motion video content, bitrate saving only gained up to 0.82%, with almost the same PSNR, while decoding complexity increase up to 10.32%.   
Volume: 9
Issue: 1
Page: 191-200
Publish at: 2011-04-01

Energy Analysis for Air Conditioning System Using Fuzzy Logic Controller

10.12928/telkomnika.v9i1.680
Henry; Universitas Bung Hatta (UBH), Universiti Teknologi Malaysia (UTM) Nasution , Hishamuddin; Universiti Teknologi Malaysia (UTM) Jamaluddin , Jamaluddin; Universiti Teknologi Malaysia (UTM) Mohd. Syeriff
 Reducing energy consumption and to ensure thermal comfort are two important considerations for the designing an air conditioning system. An alternative approach to reduce energy consumption proposed in this study is to use a variable speed compressor. The control strategy will be proposed using the fuzzy logic controller (FLC). FLC was developed to imitate the performance of human expert operators by encoding their knowledge in the form of linguistic rules. The system is installed on a thermal environmental room with a data acquisition system to monitor the temperature of the room, coefficient of performance (COP), energy consumption and energy saving. The measurements taken during the two hour experimental periods at 5-minutes interval times for temperature setpoints of 20oC, 22oC and 24oC with internal heat loads 0, 500, 700 and 1000 W. The experimental results indicate that the proposed technique can save energy in comparison with On/Off and proportional-integral-derivative (PID) control.
Volume: 9
Issue: 1
Page: 139-150
Publish at: 2011-04-01

Power Oscillation Damping Control using Robust Coordinated Smart Devices

10.12928/telkomnika.v9i1.646
Tumiran; Gadjah Mada University (UGM) Tumiran , Cuk Supriyadi Ali; Badan Pengkajian dan Penerapan Teknologi (BPPT) Nandar , Sarjiya; Gadjah Mada University (UGM) Sarjiya
The lack of damping of the electromechanical oscillation modes usually causes severe problems of low frequency oscillations in interconnected power systems. In the extreme operating conditions, PSS may fail to damp power oscillation. This paper presents a robust coordinated design of power system stabilizer (PSS) and thyristor controlled series capacitor (TCSC) to damp power oscillation in an interconnected power system. The inverse additive perturbation is applied to represent unstructured uncertainties in the power system such as variations of system parameters, system generating and loading conditions. In addition, genetic algorithm is employed to search a robust tuning to the controller parameters of both PSS and TCSC simultaneously. Simulation studies have been done in a single machine infinite bus system to confirm that the performance and robustness of the proposed controller are superior to that of the conventional controller.
Volume: 9
Issue: 1
Page: 65-72
Publish at: 2011-04-01

Case Study of a Hybrid (Wind and Solar) Power Plant

10.12928/telkomnika.v9i1.641
Sunil; Govt. Polytechnic M Jaralikar , Mangalpady; NITK Surathkal Aruna
The paper highlights the urgency of utilizing and promoting use of non conventional sources, particularly the wind and solar energy, so as to control the environmental pollution, such as ozone layer depletion, deforestation, loss of biodiversity, global warming etc. As a case study, the various performance factors of a 10 kW hybrid (wind and solar) power plant, which is having 60:40 power generation share of wind power to solar power were analysed. The study shows that there is mismatch between the designed and actual plant load factor (PLF), as well as the power generation share of the wind and solar power plant. It was also found that the plant utilization factor (PUF) was poor and that there is very less scope for installation of solar tracking system. Based on the detailed analysis of obtained results, certain recommendations were made for streamlining and optimizing the power generation capacity, and also for better utilization of generated power. 
Volume: 9
Issue: 1
Page: 19-26
Publish at: 2011-04-01

Inverse S-Transform Based Decision Tree for Power System Faults Identification

10.12928/telkomnika.v9i1.674
Srikanth; National Institute of Technology Hamirpur Pullabhatla , Ashwani Kumar; National Institute of Technology Hamirpur Chandel , Anil Naik; National Institute of Technology Hamirpur Kanasottu
 In this paper a decision tree based identification of power system faults has been proposed. The key input values to the decision tree are the performance indices calculated from the maximum values of unfiltered inverse Stockwell transform (MUNIST) technique. A wide range of techniques including Stockwell transform (ST) have been used for the identification of power system faults. However, the signatures produced by these techniques are not unique and sometimes lead to misinterpretation of faults. Consequently, a decision tree based on the inverse Stockwell transform method is proposed in the present paper to automatically identify both the symmetrical and unsymmetrical power system faults. The method is able to determine both sudden and gradual changes in the signal caused by different power system faults. The technique is very accurate and produces unique signatures compared to the existing techniques. The results obtained show the efficacy of the proposed technique. 
Volume: 9
Issue: 1
Page: 99-106
Publish at: 2011-04-01

Dynamic Evolution Control for Fuel Cell DC-DC Converter

10.12928/telkomnika.v9i1.686
Ahmad Saudi; Universitas Lampung Samosir , Tole; Universitas Ahmad Dahlan (UAD) Sutikno , Abdul Halim; Universiti Teknologi Malaysia (UTM) Mohd Yatim
Fuel cells are new alternative energy resource that has a great promise for distributed generation and electric vehicle application. However, fuel cells have a slow response due to their slow internal electromechanical and thermodynamic response. To optimize the fuel cell system performance, a fuel cell DC-DC converter with an appropriate controller which can regulate the power flow and automatically adjust the converter output voltage is needed. This paper proposes a new control technique for fuel cell DC-DC power converter. Design of the proposed control method for fuel cell DC-DC power converter is provided. A new approach for converter controllers synthesis based on dynamic evolution control theory is presented. In this paper, synthesis example of boost DC-DC converter is discussed. Performance of the proposed dynamic evolution control under step load variation condition is simulated under Matlab-Simulink environment. Simulation results show that the proposed techniques are capable for controlling fuel cell DC-DC converter.
Volume: 9
Issue: 1
Page: 183-190
Publish at: 2011-04-01
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