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All Journal International Journal of Electrical and Computer Engineering International Journal of Power Electronics and Drive Systems (IJPEDS) Seminar Nasional Aplikasi Teknologi Informasi (SNATI) Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik International Journal of Education Jurnal technoscientia Jurnal Teknologi Prosiding SNATIF Telematika ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Jurnal Perlindungan Tanaman Indonesia JURNAL NASIONAL TEKNIK ELEKTRO JTET (Jurnal Teknik Elektro Terapan) JCRS (Journal of Community Research and Service) IJITEE (International Journal of Information Technology and Electrical Engineering) Jurnal Pendidikan dan Kewirausahaan Indonesian Journal of Electrical Engineering and Computer Science JURNAL TEKNOLOGI TECHNOSCIENTIA Jurnal Generic JAREE (Journal on Advanced Research in Electrical Engineering) Pasundan Journal of Mathematics Education : Jurnal Pendidikan Matematika Jurnal Nasional Teknik Elektro dan Teknologi Informasi Jurnal INFOTEL

Eka Firmansyah

Universitas Gadjah Mada

Author-ID : 266504

Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences

Published : 54 Documents Claim Missing Document

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Articles

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Variable Step Size P&O MPPT Algorithm on 250 W Interleaved Flyback Converter Y. Munandar K.; Eka Firmansyah; Suharyanto Suharyanto
IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 1, No 4 (2017): December 2017
Publisher : Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM

Maximum power point tracking (MPPT) algorithm seek the MPP to maximize delivered the power of a photovoltaic panel. From several MPPT algorithms, the perturb and observe (P&O) algorithm is commonly used algorithm because of its easy implementation. However, it is not the most efficient algorithm due to the perturbation step is fixed. By using the high step size, the MPP tracking became fast but there would be a high steady state error and by using the low step size, there would be less steady state error but the MPP tracking became slow. Resulting in a waste of energy in steady-state conditions when the working point passes through the MPP and poorly dynamic performance indicated when the setpoint changes due to solar irradiation changes. In this paper, a modification variable step-size of the P&O algorithm has been proposed with setting the step-size automatically at each point of work. To validate the concept of modification variable step-size, simulation using PSIM has been carried out. Compared with the conventional P&O method with fixed step-size, the proposed modified P&O method can increase tracking speed and efficiency in the system.

Single Phase Full Bridge Inverter Control as Reactive Power Compensator Anang Budhi Nugroho; Eka Firmansyah; Suharyanto Suharyanto
IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 1, No 4 (2017): December 2017
Publisher : Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM

The drop of local load voltage on the distribution system is an indicator that the system experiences reactive power shortage. It can be overcome by an inverter controlled to compensate reactive power. The benefit of the inverter is that it is easily configured with a variety of functions. This paper presents the control configuration of inverter as reactive power compensators. The method used is a current control system of the proportional integrator (PI) – dq based transformation. This method generates reactive power by regulating the current domain (Id, ref = 0), while the current domain (Iq,ref) is set according to the need. Phase locked loop (PLL) is added so that the inverter can be synchronized well with the grid. According to the analysis of the PI current control, the local load voltage is stable at 219.88 Vrms and the reactive power generated by the inverter is 298 VAR with steady state error 0.11% of the reference power without oscillation.

Operation Region Selector Circuit to Obtain Maximum Efficiency of 250 W Boost Converter Riz Rifai O. Sasue; Eka Firmansyah; Suharyanto Suharyanto
IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 2, No 1 (2018): March 2018
Publisher : Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM

Interleaved boost converter gives good conversion efficiency due to its zero-current switching capability when operating in discontinuous conduction mode while keeping its input-output ripple current low. However, operating this kind of converter at interleaved operation for all the time gives poor efficiency under light-load condition. In this paper, an automatic operation region selector switch based on detection of the continuous or discontinuous current mode is proposed. With this switch, during the light-load condition, only one converter is activated, while during full-load condition both converters will be activated. The simulation results using LTspice software show that the proposed boost converter has a better efficiency compared to the conventional boost converter with efficiency range of 84.6 % to 95.32 % under various load conditions.

Bidirectional Battery Interface in Standalone Solar PV System for Electrification in Rural Areas Yuwono Bimo Purnomo; F. Danang Wijaya; Eka Firmansyah
IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 5, No 2 (2021): June 2021
Publisher : Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijitee.63471

In a standalone photovoltaic (PV) system, a bidirectional DC converter (BDC) is needed to prevent the battery from damage caused by DC bus voltage variation. In this paper, BDC was applied in a standalone solar PV system to interface the battery with a DC bus in a standalone PV system. Therefore, its bidirectional power capability was focused on improving save battery operation while maintaining high power quality delivery. A non-isolated, buck and boost topology for the BDC configuration was used to interface the battery with the DC bus. PID controller-based control strategy was chosen for easy implementation, high reliability, and high dynamic performance. A simulation was conducted using MATLAB Simulink program. The simulation results show that the implementation of the BDC controller can maintain the DC bus voltage to 100 V, have high efficiency at 99.18% in boost mode and 99.48% in buck mode. To prevent the battery from overcharging condition, the BDC stops the charging process and then works as a voltage regulator to maintain the DC bus voltage at reference value.

Piezoelectric Energy Harvester for IoT Sensor Devices Noor Pratama Apriyanto; Eka Firmansyah; Lesnanto Multa Putranto
IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 5, No 4 (2021): December 2021
Publisher : Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijitee.67120

Limited battery power is a major challenge for wireless sensor network (WSN) in internet of things (IoT) applications, especially in hard-to-reach places that require periodic battery replacement. The energy harvesting application is intended as an alternative to maintain network lifetime by utilizing environmental energy. The proposed method utilized piezoelectricity to convert vibration or pressure energy into electrical energy through a modular piezoelectric energy harvesting design used to supply energy to sensor nodes in WSN. The module design consisted of several piezoelectric elements, of which each had a different character in generating energy. A bridge diode was connected to each element to reduce the feedback effect of other elements when pressure was exerted. The energy produced by the piezoelectric is an impulse so that the capacitor was used to quickly store the energy. The proposed module produced 7.436 μJ for each step and 297.4 μJ of total energy with pressure of a 45 kg load 40 times with specific experiments installed under each step. The energy could supply WSN nodes in IoT application with a simple energy harvesting system. This paper presents a procedure for measuring the energy harvested from a commonly available piezoelectric buzzer. The specific configurations of the piezoelectric and the experiment setups will be explained. Therefore, the output energy characteristics will be understood. In the end, the potentially harvested energy can be estimated. Therefore, the configuration of IoT WSN could be planned.

Capacitor Bank Voltage Equilibrium for MPPT in Single-Phase Single-Stage Five-Level Inverter for PV-Grid Application Leonardus Heru Pratomo; F. Danang Wijaya; Eka Firmansyah
Indonesian Journal of Electrical Engineering and Computer Science Vol 14, No 1: April 2015
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar

Single-phase single-stage PV-Grid system using a five-level inverter has been investigated. Some of integration systems used two-stage converters, while others used single-stage converter. However, two-stage converters had a very complicated problem. The first converter acted as a maximum power point tracker to maximize power generated by sunlight energy to electric power, implemented by PV. The second stage was used as an interface to the grid. In single stage-converter was very simple in which an inverter was used for a maximum power point tracker and interface to the grid. This paper is designed to develop a single-stage PV-Grid system using a single-phase voltage source five-level inverter. The voltage equilibrium on capacitor was to make PV generate maximum power; hence, the equilibrium voltage between PV and five-level inverter output was proposed to deliver that maximum power generated by PV to the grid. Here, an analysis and a simulation were performed to demonstrate the design effectiveness. DOI: http://dx.doi.org/10.11591/telkomnika.v14i1.7646

Power Optimization of Spark Ignition Engine by Fuzzy Logic Ignition Controller Based on Knock Detection Agus Sujono; Raden Soekrisno; Eka Firmansyah; Oyas Wahyunggoro
Indonesian Journal of Electrical Engineering and Computer Science Vol 14, No 2: May 2015
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar

Spark ignition engines have many advantages, but to increase the power and efficiency, they have a problem to set the right ignition timing, at which the maximum power can be delivered. In reality, the optimum ignition time is immediately prior to, or close to, the moment of detonation (knock). On the other hand, the value of this optimum ignition timing is dependent primarily on the rotation of the crank shaft and the level of throttle openings. To provide the right timing proficiency level, it is very difficult to overcome the mechanical control system as found in conventional engines. So, in this study, a new electro-mechanical method based on Fuzzy Logic Ignition Controller (FLIC) which follows the pattern of the timing in the detonation chart was created. The results of the FLIC study, in fact, are able to provide correction for each spark plug ignition, according to the data on the chart of the optimal ignition timings for all combinations of engine rotations and throttle openings. From the final data recorded, it can be said that the FLIC influence on the power output which increases of up to 15% above normal. DOI: http://dx.doi.org/10.11591/telkomnika.v14i2.7597

Aplikasi Magnetic Energy Recovery Switch sebagai Dynamic Voltage Restorer pada motor Induksi Dwi Dharma Artakusuma; Fransisco Danang Wijaya; Eka Firmansyah
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 7 No 2: Mei 2018
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1559.715 KB)

Renewable energy source likes solar panel and wind turbine have intermittent character from instability power source generated. The instability power source can make dip voltage in power grid which happen in half cycle until few seconds. To stabilize the voltage in power grid from dip voltage, some methods have been developed using power electronics technology like VSI inverter, STATCOM, energy storage, OLTC, and MERS. The power electronic circuits have some advantages, such as small dimensional size and lightweight to keep voltage in power grid. In this paper, the MERS circuit was applied in induction motor which has small full bridge circuit, uncomplexity computation, and low switching frequency, so it needs low end hardware requirement. This paper proposed the use of MERS dc capacitor with 50% value from induction motor resistance. The result shows that MERS has advantage and can keep the voltage in power grid when the voltage below 39% and 15% above rated voltage (220 Vrms) with the recovery time around 0.3 second and keep the dip voltage over 1 second.

Pengendalian Motor DC Tanpa Sikat Sederhana dengan DSC 16-bit pada Aplikasi EDF Fikra Titan Syifa; Eka Firmansyah; Priyatmadi
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 4 No 4: November 2015
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (303.234 KB)

Basically, commutation process in a brushless DC motor needs rotor position information. However, to reduce production cost, in some specific applications such as fan or pump, the position sensors are not installed. It is possible to extract the rotor position through observing back emf signal available on the motor terminals. In this paper, implementation of a simple sensorless commutation controller algorithm for a BLDC motor is presented. The algorithm is implemented in a 16-bit digital signal processor (DSC). Experiment has shown that it produces correct timing signal to control BLDC motor from 1280 rpm up to over 3000 rpm.

Refleksi Pragmatisme terhadap Motivasi Belajar Matematika Siswa dalam Logika dan Cinta di Drama Korea Wulansari, Tantya; Rani, Rani; Wahidin, Didin; Firmansyah, Eka
JURNAL PENDIDIKAN DAN KEWIRAUSAHAAN Vol 12 No 1 (2024)
Publisher : STKIP PGRI SITUBONDO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47668/pkwu.v12i1.1049

The impact of Covid-19 throughout the world has resulted in a decrease in students' motivation to learn mathematics. At that time , everyone was doing activities at home so students used gadgets to study which resulted in students being exposed to Hallyu. Hallyu is a culture in South Korea. South Korea is one of the countries that is currently the center of attention in cyberspace. In the current Gen Z generation, they prefer actors or artists from that country. This research analyzes the relationship between logic and love in Korean dramas on students' mathematics learning motivation using a pragmatism approach. By watching one of the Korean drama content entitled "Melancholia" as a case study, this research uses qualitative methods with an ethnographic design based on teenagers' mindsets towards education. The results of the analysis show that logic can increase learning motivation in mathematics and help think analytically, while emotional factors such as interpersonal love can influence students' learning motivation. The pragmatism approach is relevant in the context of mathematics education. The implications of this research strengthen students' learning motivation in mathematics education for effective learning. Therefore, logic and love in the Korean drama "Melancholia" can have a positive and negative impact on students' learning motivation in learning mathematics

Co-Authors -, Priyatmadi Addin Suwastono, Addin Adeguna Ridlo Pramurti Adha Imam Cahyadi Agung Prasetyo Agus Sujono Anang Budhi Nugroho Arief Wisnu Wardana Artakusuma, Dwi Dharma Beny Firman beny firman, beny Budi Nugroho CAHYADEWA, FELIX AUSTIN Deddy Susilo Dwi Dharma Artakusuma Dwiarifiyanti, Septian Fasa, Iraldy Laendra Fauzan, Naufal Hilmi Fikra Titan Syifa Fransisco Danang Wijaya Hanny Hafiar Hardiansyah Hardiansyah Harnoko St., Harnoko Inaya Retno Putri Indah Soesanti Indra Perdana Indrawan, Rully Iswanto Iswanto Johan Agung Irawan Kania, Enung Sri L. Heru Pratomo Leonardus Heru Pratomo Lesnanto Multa Putranto Lilik Sutiarso Litasari Litasari Maemonah, Maemonah Maulidia, Khoirina Dwi Ayu Meika, Ika Mohammad Yanuar Hariyawan Mokhammad Isnaeni Bambang Setyonegoro Mubarika, Melinda Putri Nasihin, Darojatun Nenden Mutiara Sari Nia Maharani Raharja Noor Pratama Apriyanto Noviarianto, Noviarianto Oyas Wahyunggoro Pebriyani, Nais Prapto Nugroho Pratama, Dimas Yanuar Pratomo, Saifurrahman Iman Priyatmadi Pujiastuti, Sulastri Putri, Inaya Retno R. Poppy Yaniawati R. Soekrisno Rahayu Kariadinata Rakhmat, Rizki Safari Ramadina, Ina RANI RANI, RANI Risanuri Hidayat Riz Rifai O. Sasue Rudy Hartanto S.Pd. M Kes I Ketut Sudiana . Sahrudin, Asep Septian, Cepi Sidik, Yohan Fajar Sihono, Soekrisno, R. Solihah, Siti Suharyanto Suharyanto Suharyanto Suharyanto Suharyanto Suharyanto SUHARYANTO SUHARYANTO Sujono, Agus suminar, Chandra Siti Supianti, In In Suputa Suputa T. Haryono T. Haryono Tarcisius Haryono Tedy Juliandhy Tiyono Toni Prasetya Trigas Badmianto Tumiran Wahidin, Didin Wahyu Dewanto Wahyudin, Yudin Wardana, Arief Wisnu Wicaksono, Ridwan Widyawan Wijaya, Danang Wijaya, Nur Hudha Wijaya, Nur Hudha Wulansari, Tantya Y Munandar Kolewora Y. Andi Trisyono Y. Munandar K. Yaniawati, Poppy Yhone Arialistya Yogi Sawitra Yulianie, Lia Yuwono Bimo Purnomo

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