Articles
<![CDATA[Dynamic Economic Dispatch Problems: PSO Approach ]]>
<![CDATA[Mohd Ruddin Ab Ghani]]>;
<![CDATA[Saif Tahseen Hussein]]>;
<![CDATA[Nur Huda Mohd Amin]]>;
<![CDATA[Zanariah Jano]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 15, No 1: March 2017 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v15i1.4618
<![CDATA[Due to limited availability of coal and gases, optimization plays an important factor in thermal generation problems. The economic dispatch problems are dynamic in nature as demand varies with time. These problems are complex since they are large dimensional, involving hundreds of variables, and have a number of constraints such as spinning reserve and group constraints. Particle Swarm Optimization (PSO) method is used to solve these challenging optimization problems. Three test cases are studied where PSO technique is successfully applied.]]>
<![CDATA[DC bus stabilization using passive damping network in distributed power system with constant power load ]]>
<![CDATA[Awang Bin Jusoh]]>;
<![CDATA[Mohamad Hamka Bin Saiful]]>;
<![CDATA[Tole Sutikno]]>
<![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.v17i1.11715
<![CDATA[In distributed power system (DPS), the stability performance is always associated with the behaviour of constant power load (CPL). Since DPS large complex system build up from many power electronic converters, the DC bus of the system becomes unstable due to the strenuous action from power converters. When these converters tightly regulated, it behaves as constant power load and exhibit negative incremental input impedance which becomes the main reason in stability degradation of DPS. In this paper, four passive damping network topologies was proposed to reduce the DC bus instability. The best damping performance of the topologies was chosen and analysed using MATLAB/Simulink. The DC bus performances was studied in four cases which are damping behavior due to CPL power level, CPL disconnection, effects of filter and damping capacitor, and effects of filter cut-off frequency. Simulation results obtained shows that the DC bus was successfully stabilized and the resonance damped when passive damper installed. An experimental hardware tests was conducted to verify the proposed damping method and the results were compared with the simulated output waveforms. The analysis results in overshoot, settling time and steady state error of bus voltage shows system improvement with the proposed damper network.]]>
<![CDATA[PURWARUPA ALAT PEMILAH BARANG BERDASARKAN UKURAN DIMENSI BERBASIS PLC OMRON SYSMAC CPM1 ]]>
<![CDATA[Agus Susila]]>;
<![CDATA[Wahyu Sapto Aji]]>;
<![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.v5i2.1345
<![CDATA[Guna meningkatkan jumlah barang yang diproduksinya secara efektif dan efisien, termasuk dalam pemilahan barang, dunia industri sebagai produsen dituntut mampu menerapkan sistem otomatisasi. Penelitian ini bertujuan membangun sistem pemilah barang berdasarkan ukuran dimensi secara otomatis berbasis PLC. Penelitian dilakukan dengan metode eksperimen di laboratorium yang dimulai dengan merancang perangkat keras, meliputi: rangkaian sensor LDR untuk pendeteksi adanya barang, rangkaian relai sebagai On/Off input PLC dan perancangan perangkat lunak, yang meliputi: perancangan program penerima input dari sensor dan perancangan program output untuk mengaktifkan motor DC pada pemilah barang. Barang yang akan dibaca oleh sensor dirancang bergerak di atas konveyor dan dikendalikan menggunakan motor DC. Alat pemilah juga dirancang dikendalikan dengan motor DC. Sistem dirancang dapat memilah barang ukuran besar, sedang dan kecil pada tempatnya masing-masing. Pengujian dilakukan secara eksperimen yang meliputi pembacaan sensor jika telah mendeteksi adanya barang, kondisi PLC saat memberikan tanggapan pada alat pemilah, mengamati alat pemilah saat bekerja memilah barang ke tempat yang sudah disediakan. Hasil penelitian menunjukkan bahwa rancangan sistem otomatisasi pemilah barang berdasarkan ukuran dimensi berbasis PLC dapat bekerja dengan baik, memilah barang ukuran besar, sedang dan kecil pada tempatnya masing-masing. ]]>
<![CDATA[Control Strategy for Distributed Integration of Photovoltaic and Battery Energy Storage System in Micro-Grids ]]>
<![CDATA[Alias Khamis]]>;
<![CDATA[Mohd Ruddin Ab. Ghani]]>;
<![CDATA[Gan Chin Kim]]>;
<![CDATA[Mohd Shahrieel Mohd Aras]]>;
<![CDATA[Muhammad Aswad Bin Zabide]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 16, No 5: October 2018 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v16i5.10249
<![CDATA[The micro-grid deployments are growing with independently, power system designers, manufacturers and researchers for the applications where the loads are more efficient association with extra output sources such as Battery Energy Storage System (BESS), and Photovoltaic (PV) systems. Using renewable source as main sources for micro-grid system also can avoid from the pollution to occur. Energy storage when combined with PV system can provide a stronger economic performance, as well as an added benefit of backup power for critical loads. This project proposed control strategies for integration of BESS and PV in a micro-grid. The operation enables the maximum PV and BESS utilization during different operating condition of the micro-grid, grid connected, islanded mode or a process between these two operations. The project will focus on analyzing the performance between photovoltaic system and battery in the simulations of micro-grids system and validate the simulation result using MATLAB/SIMULINK software. After the simulation was analyzed, the understanding of benefit in using renewable energy source as main power supply with support from battery energy storage to supply the power to the loads and power managements is realized in the different modes on micro-grid which is grid connected or islanded states. When the power generation from PV system was not enough to accommodate electric loads, the BESS or from secondary side of transformer will supply the insufficient power.]]>
<![CDATA[PENGENDALI KECEPATAN MOTOR INDUKSI 3 FASA DENGAN INVERTER MODULASI LEBAR PULSA SERAGAM BERBASIS FPGA ACEX1K ]]>
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 5, No 1: April 2007 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v5i1.1331
<![CDATA[The major disadvantage of pulse width modulation generating by microcontroller is that the process completed in a longer period and slower system response then FPGA based system, while if based on DSP is its insufficiency in the case of flexibility and reliability. Speed demand will operate for and performance the reliable controller pushes for the implementation of evocation of PWM signal at FPGA. This research aim to design and to implement a device with uniform pulse width modulation based on FPGA Altera ACEX1K as drive inverter to control the rotational speed of a three phase induction motor. Design stage of implementing a UPWM signal generating system started from design entry, compiling, simulation and verification, and hardware configuration at FPGA Altera acex1k50tc144-3 development system with MAX+Plus II 10.2 Baseline software. At this research, three phase inverter circuit designed using MOSFET SK727 with DC input voltage 310 V. Inverter output then loaded with a three phase induction motor Y2 712-4, 370W/380V, 50Hz model. Result of this research indicate that the generating of UPWM signal design can be implemented in the form of hardwared logic at FPGA Altera acex1k50tc144-3 development system, and applicable to drive inverter as rotational speed controller of a three phase induction motor. Speed regulating function of this system was implemented by modulation index and frequency setting. At this research, system have been tested at setting frequency 10-50 Hz with the variation of modulation index, and yield a range of range 458-1468 rpm using Three phase Motor mentioned above.]]>
<![CDATA[High-Speed Computation using FPGA for Excellent Performance of Direct Torque Control of Induction Machines ]]>
<![CDATA[Tole Sutikno]]>;
<![CDATA[Nik Rumzi Nik Idris]]>;
<![CDATA[Auzani Jidin]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 14, No 1: March 2016 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v14i1.3110
<![CDATA[The major problems in hysteresis-based DTC are high torque ripple and variable switching frequency. In order to minimize the torque ripple, high sampling time and fast digital realization should be applied. The high sampling and fast digital realization time can be achieved by utilizing high-speed processor where the operation of the discrete hysteresis regulator is becoming similar to the operation of analog-based comparator. This can be achieved by utilizing field programmable gate array (FPGA) which can perform a sampling at a very high speed, compared to the fact that developing an ASIC chip is expensive and laborious.]]>
<![CDATA[Stator Field-Orientation Speed Control for 3-Phase Induction Motor under Open-Phase Fault ]]>
<![CDATA[Mohammad Jannati]]>;
<![CDATA[Tole Sutikno]]>;
<![CDATA[Nik Rumzi Nik Idris]]>;
<![CDATA[Mohd Junaidi Abdul Aziz]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 13, No 2: June 2015 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v13i2.1441
<![CDATA[The industrial requirements for the control of an Induction Motor (IM) under fault conditions continue to be of attention, as evidenced by the majority current publications. The focus is on developments of control methods which can be used for faulty IM. A novel vector control technique based on Stator Field-Oriented Control (SFOC) for a 3-phase IM under open-phase fault is proposed in this paper. MATLAB simulation results are presented to illustrate the improvement in performance of the proposed algorithm.]]>
<![CDATA[PERANCANGAN ALAT PENDETEKSI KEBAKARAN BERDASARKAN SUHU DAN ASAP BERBASIS MIKROKONTROLER AT89S52 ]]>
<![CDATA[Tole Sutikno]]>;
<![CDATA[Wahyu Sapto Aji]]>;
<![CDATA[Rahmat Susilo]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 4, No 1: April 2006 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v4i1.1244
<![CDATA[Akhir-akhir ini sering terjadi kebakaran yang disebabkan oleh beberapa faktor termasuk faktor kelalaian manusia. Proses datangnya kebakaran selalu tanpa dapat diprediksi terlebih dahulu. Umumnya kebakaran diketahui apabila keadaan api sudah mulai membesar atau asap sudah mengepul keluar dari gedung itu. Penelitian ini bertujuan untuk merancang alat pendeteksi kebakaran menggunakan sensor suhu dan sensor asap yang dapat mendeteksi adanya kebakaran secara dini. Perancangan sistem dimulai dari rangkaian sensor suhu, sensor asap, konverter tegangan analog ke digital dengan ADC 0809, pengendali sistem dengan mikrokontroler AT89S52, dan alarm sebagai indikator terjadinya kebakaran. Hasil penelitian menunjukkan bahwa prototipe sistem pendeteksi kebakaran yang dirancang dapat mendeteksi kebakaran berdasarkan informasi dari sensor suhu dan asap, dan mengaktifkan alarm sebagai indikatornya akan berbunyi.]]>
<![CDATA[THE PRELIMINARY RESEARCH FOR IMPLEMENTATION OF IMPROVED DTC SCHEME OF HIGH PERFORMANCE PMSM DRIVES BASED ON FPGA ]]>
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 6, No 3: December 2008 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v6i3.563
<![CDATA[The direct torque control (DTC) is one of control approache that is used commonly in PMSM control system. This method supports a very quick and precise torque response. However, the DTC method is not perfect and has some disadvantages. Many researchers have been proposed to modify the basic DTC scheme for PMSM drive. All this contributions allow performance to be improved, but at the same time they lead to more complex schemes. Furthermore, the PMSM drive control systems are usually based on microcontroller and DSP. Some researchers also have been used DSP and FPGA together to develop DTC for AC drives. These allow improving the performance, but they will increase cost. For the reason above, this paper proposed a new DTC scheme to apply only based on FPGA. The preliminary research showed that the proposed DTC sheme can reduce torque and flux ripples significantly. Therefore, this paper also recomend to realize proposed DTC scheme based on FPGA in order to support to execute very fast computation.The implementation is hoped that it will very potential to replace not only the induction motor but also the DC servo motor in a number of industrial process, commercial, domestic and modern military applications of high-performance drive.]]>
<![CDATA[A Review on Perturb and Observe Maximum Power Point Tracking in Photovoltaic System ]]>
<![CDATA[Rozana Alik]]>;
<![CDATA[Awang Jusoh]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 13, No 3: September 2015 ]]>
Publisher : <![CDATA[Universitas Ahmad Dahlan ]]>
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DOI: 10.12928/telkomnika.v13i3.1439
<![CDATA[Solar energy is becoming popular and has drawn lots of attention from researchers nowadays. However, the output power of the photovoltaic (PV) arrays varies with solar irradiation and temperature, which affect the efficiency of PV arrays. Therefore, Maximum Power Point Tracking (MPPT) control technique is used to extract the maximum available power from the PV arrays. Perturb and Observe (P&O) algorithm is one of the favorite techniques frequently used due to its simplicity and low cost. Yet, the conventional P&O algorithm has several drawbacks, which leads to power loss and lack of efficiency. This paper presents comparison of the basic P&O algorithm with the modified P&O algorithm used for partial shading condition in terms of complexity, accuracy, cost, and basic concept of each method.]]>
