Articles
<![CDATA[OPTIMALISASI DESAIN KENDALI KECEPATAN PUTAR MOTOR INDUKSI TIGA FASA BERBASIS FPGA ]]>
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 6, No 2: August 2008 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v6i2.554
<![CDATA[FPGA based the problem of implementation of PWM signal generating system is solution of transformation to digital gate logic space. These stages are done with sampling, quantizing and coding. Best resolution of sampling and carrier frequency, so result of PWM generating is better, but it required most digital gate. Aim of this research is optimization of last research adjustable speed drive of three-phase induction motor; with improve resolution of sampling and carrier frequency, and minimalization of digital gate used with Quine Mc Cluskey method. Result of this research indicate that the design of optimalized SPWM generating signal can be realized in hardwared-logic in ACEXIK FPGA to drive inverter as speed controller turn around the three phase induction motor, with requiring 1629 logic cell. Adjustable motor speed designed can be done by through setting make a modulation index and frequency. At this research, system have been tested at setting frequency 3-50 Hz with the variation of modulation index, and can adjustable three phase induction motor speed in range 117-1468 rpm.]]>
<![CDATA[Determination of solid material permittivity using T-ring resonator for food industry ]]>
<![CDATA[Rammah A. Alahnomi]]>;
<![CDATA[Z. Zakaria]]>;
<![CDATA[Zulkalnain Mohd Yussof]]>;
<![CDATA[Tole Sutikno]]>;
<![CDATA[Amyrul Azuan Mohd Bahar]]>;
<![CDATA[Ammar Alhegazi]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 1: February 2019 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v17i1.11636
<![CDATA[In this paper, we present a simple design of a T-ring resonator sensor for characterizing solid detection. The sensor is based on a planar microwave ring resonator and operating at 4.2 GHz frequency with a high-quality factor and sensitivity. An optimization of the T-ring geometry and materials were made to achieve high sensitivity for microwave material characterizations. This technique can determine the properties of solid materials from range of 2 GHz to 12 GHz frequencies. Techniques of current microwave resonator are usually measuring the properties of material at frequencies with a wide range; however, their accuracy is limited. Contrary to techniques that have a narrowband which is normally measuring the properties of materials to a high-accuracy with limitation to only a single frequency. This sensor has a capability of measuring the properties of materials at frequencies of wide range to a high-accuracy. A good agreement is achieved between the simulated results of the tested materials and the values of the manufacturer’s Data sheets. An empirical equation has been developed accordingly for the simulated results of the tested materials. Various standard materials have been tested for validation and verification of the sensor sensitivity. The proposed concept enables the detection and characterization of materials and it has miniaturized the size with low cost, reusable, reliable, and ease of design fabrication with using a small size of tested sample. It is inspiring a broader of interest in developing microwave planar sensors and improving their applications in food industry, quality control and biomedical materials.]]>
<![CDATA[Temperature Control of the 25kW Parabolic Dish-Stirling Engine System ]]>
<![CDATA[Liaw Geok Pheng]]>;
<![CDATA[Mohd Ruddin Ab Ghani]]>;
<![CDATA[Chin Kim Gan]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 14, No 3: September 2016 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v14i3.4055
<![CDATA[This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity indexNowadays, even though many researchers continue to investigate and study about Parabolic Dish based on Concentration Solar Power (CSP), the findings are not conclusive and do not provide accurate evidence and proof on the potential of CSP development in Malaysia. The missing link in the Parabolic Dish (PD) Stirling Engine system modelled is the control systems, which vary the amount of working gas in the Stirling engine. The temperature of the heater in PD system which has been modelled is overheated and causes damage to the heater material, low output efficiency, high thermal losses and effect to the lifespan of the PD system. Therefore, the primary aim of this paper was to design a control system to maximize output efficiency during a normal operation by maintaining the heater/absorber temperature at the highest safe operating point and preventing excessive range of threshold to prevent damage to the heater material.]]>
<![CDATA[Modelling of solar micro gas turbine for parabolic dish based controller application ]]>
<![CDATA[Syariffah Othman]]>;
<![CDATA[Mohd Ruddin Ab. Ghani]]>;
<![CDATA[Zanariah Jano]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 18, No 6: December 2020 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v18i6.16676
<![CDATA[Dish-Stirling unit and photovoltaic panels are the premier technologies available to generate off-grid solar energy. The major issue for both systems is in terms of producing output power. Air-Brayton cycle was utilized asan engine by converting the thermal energy to electricity. Micro gas turbine (MGT) has been recognized as one of the viable alternatives compared to Stirling engines, where it represents a state-of-art parabolic dish engine specifically in turbine gas technology. Hence, the microgas turbine is a technology that is capable of controlling low carbon while providing electricity in off-grid regions. MGT uses any gas as its input like natural gas, bio gas and others. Micro gas turbine has advantages for its high expansion ratio and less moving components. Compared to competing for diesel generators, the electricity costs from hybrid solar units were reduced between 10% and 43%, where as specific CO2 emissions reduced by 20-35%. MGT provides advantages over photovoltaic systems such as the inherent ability to hybridize the systems with hydrocarbon fuels to produce electricity around the clock, and the ability to operate more effectively in very hot climates with photovoltaic performance degradation over the life time of the system. Hybrid solar micro gas-turbines are cost-effective, eco-friendly and pollution free as they can work by burning any gas like natural gas,landfill gasa and others.This paper presented the controls contained in the MGT-dish system consisted of temperature control, fuel flow control, speed and acceleration control. Aconceptual design of the 25kW MGT-dish system was also covered.]]>
<![CDATA[Review on load frequency control for power system stability ]]>
<![CDATA[Muhammad Nizam Kamarudin]]>;
<![CDATA[Nabilah Shaharudin]]>;
<![CDATA[Noor Haqkimi Abd Rahman]]>;
<![CDATA[Mohd Hendra Hairi]]>;
<![CDATA[Sahazati Md. Rozali]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 19, No 2: April 2021 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v19i2.16118
<![CDATA[Power system stability is the capability of power systems to maintain load magnitude within specified limits under steady state conditions in electrical power transmission. In modern days, the electrical power systems have grown in terms of complexity due to increasing interconnected power line exchange. For that, an inherent of controllers were essential to correct the deviation in the presence of external disturbances. This paper hence aims to review the basic concepts of power system stability in load frequency control. Various control techniques were analyzed and presented. Power system stability can be classified in terms of method to improve power system stability, which are rotor angle stability, frequency stability and voltage stability. It is found that each method has different purpose and focus on solving different types of problem occurred. It is hoped that this study can contribute to clarify the different types of power system stability in terms of where it occurs, and which is the best method based on different situation.]]>
<![CDATA[Editorial: Scientific Writing Workshop on TELKOMNIKA Editors and Authors Meeting (TEAM) ]]>
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 16, No 2: April 2018 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v16i2.3773
<![CDATA[In this year, TELKOMNIKA is organizing scientific writing workshop series for improving manuscript quality which is called as “Scientific Writing Workshop on TELKOMNIKA Editors and Authors Meeting (TEAM)”. This workshop is aimed at developing scientific writing skills to both editing and proofreading for preparing final manuscript. Editing covers reread manuscript which includes content, overall structure, clarity, style and citations to see whether the manuscript is well-organized and the transitions between paragraphs are smooth. Proofreading is the final stage of the editing process, focusing on surface errors such as misspellings and mistakes in grammar and punctuation. This process is just as important as any other aspect of writing. The process is instrumental in getting ideas across in an accessible and logical manner.]]>
<![CDATA[SISTEM SELEKSI KEMATANGAN BUAH TOMAT WAKTU-NYATA BERBASIS NILAI RGB ]]>
<![CDATA[M. Riza Ferdiansyah]]>;
<![CDATA[Kartika Firdausy]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 4, No 3: December 2006 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v4i3.1324
<![CDATA[Buah tomat merupakan salah satu hasil pertanian yang banyak dikonsumsi sebagai bahan baku industri pangan. Buah tomat yang diolah memiliki standar kematangan tertentu, sehingga menghasilkan produk olahan yang bermutu tinggi. Proses seleksi kematangan buah tomat secara manual dirasakan kurang mendukung akselerasi produk, apalagi pada proses industri skala besar. Pada penelitian ini dirancang purwarupa sistem seleksi kematangan buah tomat waktu-nyata berbasis nilai RGB (Red-Green-Blue) citra tomat yang di-capture oleh webcam dan diolah oleh komputer pribadi dengan perangkat lunak Borland Delphi 7. Hasil penelitian menunjukkan bahwa purwarupa sistem seleksi kematangan buah tomat yang dirancang memiliki nilai keberhasilan 96%.]]>
<![CDATA[MATLAB/SIMULINK BASED ANALYSIS OF VOLTAGE SOURCE INVERTER WITH SPACE VECTOR MODULATION ]]>
<![CDATA[Auzani Jidin]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 7, No 1: April 2009 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v7i1.572
<![CDATA[Space vector modulation (SVM) is the best modulation technique to drive 3-phase load such as 3-phase induction motor. In this paper, the pulse width modulation strategy with SVM is analyzed in detail. The modulation strategy uses switching time calculator to calculate the timing of voltage vector applied to the three-phase balanced-load. The principle of the space vector modulation strategy is performed using Matlab/Simulink. The simulation result indicates that this algorithm is flexible and suitable to use for advance vector control. The strategy of the switching minimizes the distortion of load current as well as loss due to minimize number of commutations in the inverter.]]>
<![CDATA[PENGENDALI MOTOR INDUKSI SATU FASA DENGAN INVERTER UPWM BERBASIS FPGA ]]>
<![CDATA[Joko Purwanto]]>;
<![CDATA[Andi Martanto]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 5, No 2: August 2007 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v5i2.1346
<![CDATA[Frekuensi dan tegangan catu daya adalah dua komponen utama dalam sebuah sistem pengendali motor induksi. Pengendali yang banyak dikembangkan menggunakan inverter dengan metode PWM (Pulse Width Modulation). Keuntungan pembangkitan sinyal PWM berbasis FPGA dibandingkan dengan menggunakan DSP (Digital Signal Processing) dan mikrokontroler adalah dapat memenuhi tuntutan kecepatan operasi. Penelitian ini bertujuan merancang sebuah pembangkit sinyal UPWM (Uniform Pulse Widtah Modulation) sebagi pengendali inverter satu fasa untuk mengatur kecepatan motor induksi satu fasa. Rancangan dibuat melalui metode penggambaran skematik dengan perangkat lunak MAX+Plus II Baseline versi 10.2. Rancangan selanjutnya di-compile dengan MAX+Plus II compiler dan diverifikasi dengan MAX+ Plus II Simulator, kemudian dikonfigurasikan secara perangkat keras pada FPGA Altera ACEX1K50TC144-3. Hasil rancangan digunakan sebagai penggerak rangkaian inverter satu fasa dengan beban sebuah motor induksi. Rangkaian inverter dirancang menggunakan MOSFET SK 727 dengan tegangan masukan DC sebesar 127 V. Plant motor induksi satu fasa yang digunakan pada penelitian ini adalah model Z-406, 125/220, 50 Hz. Hasil penelitian menunjukkan bahwa rancangan sinyal UPWM dapat diwujudkan dalam bentuk hardwere logic pada FPGA dan dapat digunakan untuk men-drive inverter sebagai pengendali motor induksi satu fase. Pengaturan kecepatan pada range 289-1466 rpm.]]>
<![CDATA[Fuzzy Logic Implementation with MATLAB for PV-Wind Hybrid System ]]>
<![CDATA[Alias Khamis]]>;
<![CDATA[Mohd Ruddin Ab. Ghani]]>;
<![CDATA[Chin Kim Gan]]>;
<![CDATA[Mohd Shahrieel Mohd Aras]]>;
<![CDATA[Muhamad Fiqry Khamis]]>;
<![CDATA[Tole Sutikno]]>;
<![CDATA[Jano Zanariah]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 15, No 3: September 2017 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v15i3.6099
<![CDATA[This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity indexThe development of hybrid renewable energy sources is vital in power generation. This study focused on design of fuzzy logic control on hybrid PV/Wind system in order to improve the speed of DC motor. The fuzzy logic control based on battery management system has been designed for effective power utilization and improvement of the DC motor speed performance. In battery management system, a control was proposed to operate the charging and discharging mode of battery during non-linear power generation. While the battery would charge whenever the renewable energy power was greater than consumer load power, the battery would discharge whenever the renewable energy power was less than the consumer load power. DC motor speed control, included the simulation, implementation of fuzzy logic controller to DC motor and comparison between PID controller and Fuzzy Logic Controller. The proposed model was simulated using Matlab environment and the results was analyzed. Finally, simulation results were evaluated and validated to determine the effectiveness of the proposed controller.]]>
