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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) Majalah Ilmiah Teknologi Elektro Jurnal Teknik Elektro Indonesian Journal of Electrical Engineering and Informatics (IJEEI) PROtek : Jurnal Ilmiah Teknik Elektro Sistemasi: Jurnal Sistem Informasi Jurnal RESTI (Rekayasa Sistem dan Teknologi Informasi) JOURNAL OF INFORMATICS AND TELECOMMUNICATION ENGINEERING Praxis : Jurnal Sains, Teknologi, Masyarakat dan Jejaring CYCLOTRON JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat) Journal of Robotics and Control (JRC) Indonesian Journal of Electrical Engineering and Computer Science Jurnal Litbang Provinsi Jawa Tengah Jurnal Nasional Teknik Elektro dan Teknologi Informasi Jurnal Rekayasa elektrika Jurnal INFOTEL Majalah Ilmiah Teknologi Elektro

Slamet Riyadi

Program Studi Teknik Elektro, Universitas Katolik Soegijapranata

Author-ID : 2379213

Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mechanical Engineering Public Health Social Sciences

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Implementasi Object Tracking untuk Deteksi Titik Laser Menggunakan Raspberry Pi 4 Lies Teddy Galang Ramadhan; Florentinus Budi Setiawan; Slamet Riyadi; Leonardus Heru Pratomo
Sistemasi: Jurnal Sistem Informasi Vol 10, No 2 (2021): Sistemasi: Jurnal Sistem Informasi
Publisher : Program Studi Sistem Informasi Fakultas Teknik dan Ilmu Komputer

AbstrakPenelitian ini menyajikan sistem pan-tilt servo yang dapat mengikuti objek yang telah ditentukan. Perlu tercapainya pelacakan yang otomatis dan dapat terpantau melalui monitor. Sistem pada alat ini menggunakan raspberry pi atau komputer kecil, pi camera, pan-tilt servo, laser dan metode template matching. Template matching adalah metode pada pengolahan citra digital untuk menemukan bagian-bagian kecil dari gambar yang cocok dengan gambar template. Raspberry pi terhubung pi camera, kamera berfungsi menangkap gambar pada objek setelah disinari titik laser yang digerakkan oleh pan-tilt servo. Menggunakan motor servo yang rasio torsi terhadap beban dan keakuratan. Pengenalan warna atau color recognition dilakukan menggunakan openCV yang terinstall pada raspberry pi. Hasil pada alat ini berupa software yang dapat melakukan object tracking dari penangkapan pi camera dengan jarak objek 2 meter.Kata kunci: camera, raspberri pi,pan-tilt servo, template matching. AbstractThis study presents the pan-tilt servo system to follow an object that has been determined.Need to achieve automatic tracking and can be observed through the monitor.The system in this tool uses a raspberry pi or small computer, pi camera, pan-tilt servo, laser and template matching methods.Template matching is a method of processing the digital image to find small parts of the image that matches the template image.Raspberry pi connected to pi camera, the camera functions to capture images of objects after being illuminated by a laser point which is moved by a pan-tilt servo.Using a servo motor which has the ratio of torque to load and accuracy. Color recognition or color recognition is done using openCV installed on the raspberry pi. The result of this tool is software that can perform object tracking from the capture of the pi camera with an object distance of 2 meters. Keywords: camera, raspberri pi,pan-tilt servo, template matching.

Digital Control for a PV Powered BLDC Motor Slamet Riyadi
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 8, No 4: December 2017
Publisher : Institute of Advanced Engineering and Science

Stand-alone applications of Photovoltaic (PV) can be found in water pumping systems for rural area. The proper electric motor must be chosen for optimal considerations. One of the modern electric motor called brushless motor (BLDC) can be an alternative for this application although it has complexity in control. Powering such a motor by using electric energy generating by PV modules will be an interesting problem. In this paper, a PV powered BLDC motor system is proposed. The PV modules must produce maximum power at any instant time and then this power must be able to rotate the motor. By combining sequential stator energizing due to a rotor detection and a PWM concept, the speed of BLDC can be controlled. Meanwhile, to get maximum power of PV modules, detection of voltage and current of the modules are required to be calculated. Digital Signal Control (DSC) is implemented to handle this control strategy and locks the width of the PWM signal to maintain the PV modules under maximum power operation. The effectiveness of the proposed system has been verified by simulation works. Finally the experimental works were done to validate.

A Single-Phase Dual-Stage PV-Grid System with Active Filtering Slamet Riyadi; Yanuarsyah Haroen
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 6, No 3: September 2015
Publisher : Institute of Advanced Engineering and Science

Integrating photovoltaic based electricity into the grid and power quality improvement have become two major issues in electrical system. Formerly, these can be solved by using two converter systems separately, a PV-Grid System and an active power filter. But recent technology uses only a converter system to do both function. An existed shunt active power filter (SAPF) can be modified to form a dual-stage PV-Grid with active filtering capability. In this paper, a PV-Grid System that is capable to transfer all power generated by PV modules and reduce harmonic contents is proposed. The system was formed by connecting a boost chopper as a Maximum Power Point Tracker and PV modules to the DC-link capacitor of a single-phase SAPF. It just needed a current transducer and also required simpler control circuits. A voltage controller was needed to achieve power equilibrium while a current controller was needed to make the grid current sinusoidal with unity power factor. To verify the analysis, simulations and experiments were done.

Single-Phase Single-Stage PV-Grid System Using VSI Based on Simple Control Circuit Slamet Riyadi
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 3, No 1: March 2013
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (153.686 KB)

Integrating electric energy generated by PV with utilities has been developed. Some of these using two-stage converters and the others using single stage converters. For systems with two-stage converters, the first stage converter acts as a MPPT to maximize power generated by PV and the second stage is used as an interface to the utilities. In the single-stage system, an inverter is used for both function. In this paper, PV-Grid System using a single-stage Voltage Source Inverter is proposed. The simple control circuit to make PV generate maximum power and keeping power equilibrium between PV and inverter output power is used. To verify the analysis, simulations are done.DOI: http://dx.doi.org/10.11591/ijpeds.v3i1.1860

Design and implementation of a single-phase five-level inverter using a DC Source with voltage balancer on capacitor Leonardus Heru Pratomo; Slamet Riyadi
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 12, No 2: June 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v12.i2.pp902-912

The global use of renewable energy resources has led to the design and development of high performance, efficient, controllable, and cheap multilevel inverters, which act as a solution to the numerous power deficiencies. However, in terms of control, these multilevel inverters are often associated with DC sources and complexity. Therefore, this research designed a single-phase five-level inverter using a DC source, with a novel sinusoidal pulse-width-modulated (SPWM) control scheme. The system consists of a Flying Capacitor DC-DC Converter and H-Bridge Inverter (FCDCDC-HBI). A single absolute reference signal and the phase-shifted triangular carrier were used to generate SPWM to enhance the capacitor voltage balance. The designed inverter is capable of producing five levels of output voltage levels, namely Vi, Vi/2, 0, −Vi/2, and −Vi from a DC supply, thereby reducing the overall cost and complexity of the SPWM system. This research also produced a detailed operation principle of the proposed system, which was verified through simulation and implemented using a prototype. Finally, hardware implementation results are presented to check the performance of the inverter.

Pulse Injection Method to Increase Precision of Rotary Encoder on Switched Reluctance Motors Nelson Roberto Duarte; Slamet Riyadi; Leonardus Heru Pratomo; Florentinus Budi Setiawan
JOURNAL OF INFORMATICS AND TELECOMMUNICATION ENGINEERING Vol 4, No 2 (2021): EDISI JANUARY 2021
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jite.v4i2.4425

Penggunaan switched reluctance motor (SRM) dalam aplikasi industri banyak diterapkan, hal ini dikarenakan SRM memiliki kelebihan antara lain tidak menggunakan magnet permanen serta kontruksi sederhana berupa inti besi pada rotor dan belitan stator. SRM membutuhkan informasi posisi rotor dalam pengoperasianya. Informasi posisi rotor yang sering digunakan adalah sensor hall effect yang sudah terpasang di dalam body motor walaupun adanya kelemahan terhadap akurasi. Untuk mendapatkan akurasi yang baik maka rotary encoder digunakan sebagai informasi posisi rotor. Rotary encoder memiliki tingkat kepresisian yang tinggi tapi dalam pemasangannya dibutuhkan sinkronisasi terhadap posisi rotor. Injeksi pulsa dilakukan untuk mencari kesesuaian antara posisi rotor dengan rotary encoder. Pada makalah ini diusulkan kendali SRM dengan informasi posisi rotor berasal dari pulsa rotary encoder. Hasil dari injeksi pulsa digunakan untuk menentukan profil induktansi pada posisi tertentu. Berdasarkan profil induktansi didapatkan sinkronisasi antara posisi rotor dengan pulsa rotary encoder. Untuk mendukung tercapainya metode analisis yang diusulkan dilakakukan pengujian pada laboratorium

MEMPERBAIKI KUALITAS DAN MENINGKATKAN EFISIENSI DAYA LISTRIK MELALUI BOOST RECTIFIER Slamet Riyadi
JURNAL LITBANG PROVINSI JAWA TENGAH Vol 6 No 2 (2008): Jurnal Litbang Provinsi Jawa Tengah
Publisher : Badan Perencanaan Pembangunan, Penelitian dan Pengembangan Daerah Provinsi Jawa Tengah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36762/jurnaljateng.v6i2.188

Krisis energi yang disebabkan keterbatasan tersedianya bahan bakar minyak memberikan dampak pada berbagai sektor kehidupan termasuk dalam konsumsi energi listrik. Bahkan pemerintah menyarankan upaya penghematan listrik kepada para konsumen. Penghematan listrik bagi dunia industri dan perkantoran sangat sulit dilaksanakan terkait produktivitas sehingga langkah lain dalam menghemat energi listrik perlu disarankan. Secara teknis, energi listrik dimanfaatkan oleh konsumen untuk diubah menjadi daya nyata (kerja), tetapi dalam realisasinya energi listrik juga diubah menjadi daya reaktif (daya yang tidak menjadi kerja) sehingga akan menurunkan efisiensi pemanfaatannya. Peralatan listrik yang digunakan dalam sektor industri, perkantoran maupun aplikasi rumah tangga banyak didominasi peralatan yang membutuhkan tegangan searah. Karena sumber daya listrik yang tersedia (oleh PLN) adalah tegangan bolak-balik maka dibutuhkan penyearah. Penyearah tradisional yang memanfaatkan dioda dan thyristor banyak digunakan karena kesederhanaan, tetapi merupakan pembangkit harmonisa yang mengakibatkan distorsi sehingga akan menurunkan kualitas daya listrik yang dapat menyebabkan dampak negatif terhadap peralatan lain yang terpasang pada instalasi. Dalam penelitian ini dikaji suatu langkah untuk memperbaiki kualitas dan meningkatkan efisiensi energi listrik melalui reduksi daya reaktif dan harmonisa. Langkah eliminasi daya reaktif dan harmonisa dilakukan oleh boost rectifier yang bekerja sebagai penyearah berunjuk kerja tinggi. Penyearah jenis ini mampu menyediakan tegangan searah yang teregulasi baik dengan tetap menyerap arus sumber sinusoidal sehingga distorsi arus sumber minimal. Kondisi demikian dapat meningkatkan kualitas daya listrik. Dengan hasil peneltian ini, langkah penghematan energi listrik secara signifikan dapat dilakukan tanpa mengurangi produktivitas dan kualitas daya dapat dijaga tetap baik sehingga dampak negatif terhadap peralatan lain mampu direduksi.

A Simple Method to Control The Excitation Angle for Switched Reluctance Motor Slamet - Riyadi
Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 9, No 2: June 2021
Publisher : IAES Indonesian Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52549/ijeei.v9i2.2814

A switched reluctance motor (SRM) has been an alternative solution for electric drives because of its benefit features. The use of such a motor in electric vehicles (EVs) or hybrid electric vehicles (HEVs) requires a control strategy that is capable to develop high torque. SRMs are commonly available in the market with rotor position detectors embedded inside. Problems will appear when such detectors are not symmetrically installed because most of SRM control strategies are commonly based on them. Inaccurate pulses will be generated by the control circuit which finally takes effect on phase current commutation or the beginning of the excitation which is not on proper angle. The use of such detectors is just capable to give information of rotor position in common angles. Improvement for such problems can be done by generating pulses related to the rotor position in smooth angles. In this paper, a control strategy to produce excitation signals with proper angles for SRM stator winding is proposed. By using input capture facility that is commonly available in embedded system, excitation angles can be controlled precisely because a large number of pulses can be produced by the system. Accuracy level of this strategy is determined by TIMER period of embedded system and speed of SRM. To verify the analysis, laboratory experiments were done. They show that the proposed control strategy is capable to rotate the motor with better performance.

Design and Implementation of Smart Forklift for Automatic Guided Vehicle Using Raspberry Pi 4 Florentinus Budi Setiawan; Phoa Marcellino Siva; Leonardus Heru Pratomo; Slamet Riyadi
Journal of Robotics and Control (JRC) Vol 2, No 6 (2021): November
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jrc.26130

Automatic Guided Vehicle (AGV) pallet truck is widely used in the industry. This kind of AGV is such a combination of the ordinary AGV used forklift mechanism. The forklift mechanism is employed for lifted up or carrying things from one place to another place. As the technology has been developed along with the industry revolution 4.0, therefore, the activity could be done automatically by using a robot-like AGV pallet truck. Basically, the working principle of the AGV pallet truck is similar to the ordinary forklift whereas the AGV pallet truck is automatically operated. DC motor is applied as the driving force for the uplifting and down lifting process in the forklift mechanism of the AGV pallet truck. DC motor is chosen because it has large torque which is advantageous for lifting loads. Unfortunately, DC motor also owns some disadvantages such as high maintenance fees and less precision. This study proposes a smart forklift mechanism for AGV pallet trucks that utilizes a stepper motor and ultrasonic distance sensor. This smart forklift mechanism is equipped with raspberry pi model B as the main microcontroller and combined with an ultrasonic distance sensor. The result of the ultrasonic distance sensor has an error approaching zero percent so the precision of the height can be fully controlled. Step / Revolution (SPR) method makes the stepper motor can move smoothly like micro-step and also the number of rotations can be controlled as we want.

Design and Implementation of Double Loop Control Strategy in TPFW Voltage and Current Regulated Inverter for Photovoltaic Application Leonardus Heru Pratomo; Agutinus Fidelis Wibisono; Slamet Riyadi
Journal of Robotics and Control (JRC) Vol 3, No 2 (2022): March
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jrc.v3i2.14365

Increasing demands for renewable energy encourage the development of inverters as a solution for converting energy from direct photovoltaic current (DC) output to alternative current (AC) at a maximum output power. Several nation standard systems are three-phase four-wired (TPFW), which means that the TPFW inverter must be used. The issue arises because the TPFW inverter is operated through an open-loop system, which has the problem of preventing the inverter from adjusting the voltage and current as needed. Hence, the open-loop system must be converted to a closed-loop system which is usually used only single control. The single strategy control is not effective because this strategy cannot regulate voltage and current at the same time. It only controls either voltage or current. The output voltage or current is changed when the load value is changed. Due to its weaknesses, the study proposes a new double-control strategy method that utilizes a PI strategy (P) controller as a voltage controller and a proportional strategy control as a current controller. This strategy is tested and measured by using simulation, showing a THD value of 1.07%. Accordance to IEEE standards, the THD value is within the recommended limit. Therefore, the output voltage and current produced have a good signal with a low ripple and stability without fluctuation.

Co-Authors Agengkarunia Cahyadi Wibawa Agutinus Fidelis Wibisono Alvin Martanio Arifin Wibisono Arifin Wibisono Eric Pratama Putra F. Budi Setiawan Farrel Adriantama Florentinus Budi Setiawan Florentinus Budi Setiawan Florentinus Budi Setiawan Florentinus Budi Setiawan Franciska Amalia Kurnianingsih Guntur Sumartin Laras Triefena Leonardus H. Pratomo Leonardus Heru Pratomo LEONARDUS HERU PRATOMO Leonardus Heru Pratomo Leonardus Heru Pratomo Lies Teddy Galang Ramadhan Nelson Roberto Duarte Padang Ufqi Sutrisno Phoa Marcellino Siva Rachmat Hidayat Shandy Jenifer Matitaputty Sulaiman Sulaiman Wibisono, Arifin Yanuarsyah Haroen Yosia Yovie Christian Wibowo

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