Articles
<![CDATA[Pengaruh Penutupan-Balik Tak-Sinkron terhadap Generator Induksi 3-Fase dalam Skema Pembangkitan Tersebar ]]>
<![CDATA[M. Isnaeni B. S.]]>;
<![CDATA[F. Danang Wijaya]]>;
<![CDATA[Eka Firmansyah]]>
<![CDATA[ Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 6 No 4: November 2017 ]]>
Publisher : <![CDATA[Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada ]]>
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<![CDATA[Small and medium-scale plants connected to the distribution line form a distributed generation (DG) system. Unsynchronized reclosing, due to the operation of a recloser, is an important issue in DG systems. In this paper, simulations of typical DG system are performed to show the effect of unsynchronized reclosing. The simulation results show that unsynchronized reclosing causes the generator to experience over speed, over and under voltage, and over current, which can damage or reduce the life of the generator. A permanent short circuit that causes the contact of recloser to open and close repeatedly has a worse effect than a temporary short circuit. Opening the circuit breaker at point of common coupling with the installation of dummy load can reduce the bad effect of unsynchronized reclosing.]]>
<![CDATA[Sinusoidal Pulse Width Modulation Berbasis Lookup Table untuk Inverter Satu Fase Menggunakan 16-Bit Digital Signal Controller ]]>
<![CDATA[Yohan Fajar Sidik]]>;
<![CDATA[Danang Wijaya]]>;
<![CDATA[Eka Firmansyah]]>
<![CDATA[ Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 2 No 2: Mei 2013 ]]>
Publisher : <![CDATA[Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada ]]>
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<![CDATA[Inverter as one equipment relates closely to the renewable energy sector gain more and more important role in utilizing renewable energy widely. The inverter converts dc to ac form by a specific switching strategy. In this research, the switching strategy employed unipolar sinusoidal pulse width modulation (SPWM). The switching schemes were obtained by synthesis from sine lookup table that the width of pulses were obtained from simulation of PSIM. The aim of this research is to create a switching scheme in a software and then implemented in16-bit digital signal controller (DSC). Experiment in lab scale has been done to verify the proposed unipolar SPWM. The results showed that SPWM signals were easier generated in 16-bit digital signal controller (DSC). Other that, feature of PWM in this DSC has been supporting in inserting dead-time to avoid shoot through current at IGBT.]]>
<![CDATA[Implementasi Komunikasi Data Berbasis ZigBee pada SCADA (Supervisory Control and Data Acquisition) PLTMh ]]>
<![CDATA[Beny Firman]]>;
<![CDATA[Suharyanto]]>;
<![CDATA[Eka Firmansyah]]>
<![CDATA[ Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 2 No 1: Februari 2013 ]]>
Publisher : <![CDATA[Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada ]]>
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<![CDATA[Recently, Microhydro Power Center (Pusat Listrik Tenaga Mikrohidro or PLTMh) has been spread widely the energy electric generator. PLTMh control system in Indonesia often uses automatic control system. One of the reasons for this is that the operation and monitoring of the PLTMh could be done from a distance. One of PLTMh models of remote control is known as SCADA. One of the main parts of SCADA is Master Station (MS), Remote Terminal Unit (RTU) & Communication System. Communication System in SCADA can be built in several choices: wired or wireless. Remote control can be built using Wireless Sensor Network (WSN) system. The application of WSN in operating SCADA could ease installation and increase communication reliability. This study applied ZigBee technology on PLTMh SCADA control data communication. ZigBee was chosen because it’s free of operation and licensing charge, had OSI feature and low cost, those are reasons why they are best suited to PLTMh application. In the application, ZigBee hardware was divided into several parts: Coordinator on Master Station(MS) (one unit), End Devices which were each RTU unit point (two units) and Router as a data hooping between Coordinator & End Device (one unit). The furthest point between Coordinator and End Device through Router could reach 645 meters. This was tested in LOS (Line of Sight) condition. RSSI signal on ZigBee was used to see the strength of signal reception on Coordinator as data collector. RSSI score (-dBm) became smaller at maximum distance variation. This meant signal power at data jump point became lower. ZigBee based data communication to form SCADA network had been built well in join a network model, which was between Coordinator — Router — End Device at the furthest distance, 645 meters, with signal power of -82dBm.]]>
<![CDATA[Design of a Low Cost High Efficiency Multiple Output Self Oscillating Flyback Converter ]]>
<![CDATA[Yogi Sawitra]]>;
<![CDATA[Prapto Nugroho]]>;
<![CDATA[Eka Firmansyah]]>;
<![CDATA[Wahyu Dewanto]]>;
<![CDATA[Rudy Hartanto]]>;
<![CDATA[Tiyono Tiyono]]>;
<![CDATA[Tumiran Tumiran]]>
<![CDATA[ IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 1, No 2 (2017): June 2017 ]]>
Publisher : <![CDATA[Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM ]]>
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DOI: 10.22146/ijitee.29769
<![CDATA[The use of some integrated circuits in an SMPS circuit are the main factor that increasing the cost. Self-oscillating feedback converter topology is a well-known circuit topology for low-cost application without using any single integrated circuit chip. In this paper, a Low Cost with high efficiency converter without any single integrated circuit component was analysed and designed. It has also multiple outputs of 3.3 V/1 A, 5 V/0.5 A, and 12 V/0.1 A so that it can be used as power supply for DVD player. Experiment results showed that it can deliver continuously output voltage as designed and a total output power of 7.3 W, with an efficiency for about 70%.]]>
<![CDATA[Parameter Identification of Nonlinear System on Combustion Engine Based MVEM using PEM ]]>
<![CDATA[Trigas Badmianto]]>;
<![CDATA[Eka Firmansyah]]>;
<![CDATA[Adha Imam Cahyadi]]>
<![CDATA[ IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 1, No 4 (2017): December 2017 ]]>
Publisher : <![CDATA[Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM ]]>
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DOI: 10.22146/ijitee.35026
<![CDATA[In four-stroke engine injection system, often called spark ignition (SI) engine, the air-fuel ratio (AFR) is taken from the measurement of lambda sensor in the exhaust. This sensor does not directly describe how much AFR in the combustion chamber due to the large transport delay. Therefore, the lambda sensor is used only as a feedback in AFR control "correction", not as the "main" control. The purpose of this research is to identify the parameters of the non-linear system in SI engines to produce AFR estimator. The AFR estimator is expected to be used as a feedback of the main "AFR" control system. The process of identifying the parameters using the Gauss-Newton method, due to its rapid computation to Achieve convergence, is based on prediction error minimization (PEM). The models of AFR estimator is an open-loop system without a universal exhaust gas oxygen (UEGO) sensors as feedback, called a virtual AFR sensor. The high price of UEGO sensors makes the virtual AFR sensor can be a practical solution to be applied in AFR control. The model in this research is based on the mean value engine models (MVEM) with some modifications. The research dataset was taken from a Hyundai Verna 2002 with the additional UEGO type of lambda sensors. The throttle opening angle (input) is played by stepping on the gas pedal and the signal to the injector (input) is set to a certain quantity to produce the AFR (output) value read by the UEGO sensor. This research produces an open loop estimator model or AFR virtual sensors with normalized root mean square error (NRMSE) = 0.06831 = 6.831%.]]>
<![CDATA[Variable Step Size P&O MPPT Algorithm on 250 W Interleaved Flyback Converter ]]>
<![CDATA[Y. Munandar K.]]>;
<![CDATA[Eka Firmansyah]]>;
<![CDATA[Suharyanto Suharyanto]]>
<![CDATA[ IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 1, No 4 (2017): December 2017 ]]>
Publisher : <![CDATA[Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM ]]>
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DOI: 10.22146/ijitee.35030
<![CDATA[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.]]>
<![CDATA[Single Phase Full Bridge Inverter Control as Reactive Power Compensator ]]>
<![CDATA[Anang Budhi Nugroho]]>;
<![CDATA[Eka Firmansyah]]>;
<![CDATA[Suharyanto Suharyanto]]>
<![CDATA[ IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 1, No 4 (2017): December 2017 ]]>
Publisher : <![CDATA[Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM ]]>
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DOI: 10.22146/ijitee.35539
<![CDATA[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.]]>
<![CDATA[Operation Region Selector Circuit to Obtain Maximum Efficiency of 250 W Boost Converter ]]>
<![CDATA[Riz Rifai O. Sasue]]>;
<![CDATA[Eka Firmansyah]]>;
<![CDATA[Suharyanto Suharyanto]]>
<![CDATA[ IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 2, No 1 (2018): March 2018 ]]>
Publisher : <![CDATA[Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM ]]>
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DOI: 10.22146/ijitee.36649
<![CDATA[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.]]>
<![CDATA[Bidirectional Battery Interface in Standalone Solar PV System for Electrification in Rural Areas ]]>
<![CDATA[Yuwono Bimo Purnomo]]>;
<![CDATA[F. Danang Wijaya]]>;
<![CDATA[Eka Firmansyah]]>
<![CDATA[ IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 5, No 2 (2021): June 2021 ]]>
Publisher : <![CDATA[Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM ]]>
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DOI: 10.22146/ijitee.63471
<![CDATA[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.]]>
<![CDATA[Piezoelectric Energy Harvester for IoT Sensor Devices ]]>
<![CDATA[Noor Pratama Apriyanto]]>;
<![CDATA[Eka Firmansyah]]>;
<![CDATA[Lesnanto Multa Putranto]]>
<![CDATA[ IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 5, No 4 (2021): December 2021 ]]>
Publisher : <![CDATA[Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM ]]>
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DOI: 10.22146/ijitee.67120
<![CDATA[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.]]>
