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All Journal TEKNIK Jurnal Teknik Elektro Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Seri Kajian Ilmiah Journal of Robotics and Control (JRC)
Leonardus Heru Pratomo
Seogijapranata Catholic University
Aerospace Engineering Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Mechanical Engineering

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SISTEM PENGKONVERSI DAYA MAKSIMAL MODUL SURYA MELALUI DETEKSI TEGANGAN Leonardus Heru, Pratomo
Seri Kajian Ilmiah Vol 15, No 1 (2013)
Publisher : Seri Kajian Ilmiah

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Abstract

Krisis energi yang disebabkan keterbatasan tersedianya bahan bakar minyak memberikan dampak pada berbagai sektor kehidupan. Berbagai usaha untuk mengatasi permasalahan tersebut telah banyak dilakukan mulai dari pencarian sumber energi alternatif hingga langkah-langkah penghematan energi. Energi listrik sebagai salah satu bentuk energi yang paling banyak digunakan manusia sangat terpengaruh akibat terjadinya kelangkaan bahan bakar minyak. Sinar matahari di Indonesia terpancar setiap hari dan belum dimanfaatakan secara maksimal. Alat yang merubah besaran energi sinar matahari ke energi listrik biasa disebut photovoltaic secara terintegrasi dinamakan modul surya. Modul surya memiliki karakteristik yang unik untuk mendapatkan daya maksimal. Dalam merancang sistem kendali untuk memaksimalkan daya ini harus sesuai dengan kurva karakteristikya. Kendali tipe tegangan diterapkan untuk mengendalikan aliran daya pada sistem konversi energi ini. Dengan metode ini alat memiliki efisiensi konversi energi kurang lebih sebesar 83% hal ini didasarkan pada percobaan di laboratorium konversi energi listrik.
Desain dan Implementasi Algoritma Korelasi Daya dan Tegangan di Kapasitor untuk Maximum Power Point Trackking pada Photovoltaic Menggunakan Arduino Uno Pratomo, Leonardus Heru; Riyadi, Slamet
Jurnal Teknik Elektro Vol 12, No 1 (2020): Jurnal Teknik Elektro
Publisher : Jurusan Teknik Elektro, Fakultas Teknik, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jte.v12i1.23481

Abstract

Photovoltaic is a main device in solar power generation systems. The performance of this component needs to be improved to get the maximum power point. Many methods for maximizing power in photovoltaic have been developed and implemented in various algorithms. In fact, the algorithm has a lot of complexity and it requires a signal processing system that has a high speed and expensive one in the implementation. To overcome this problem, an algorithm based on power and voltage correlation inthe capacitors is developed to get maximum power. If the voltage across the capacitor is controlled according to the maximum power point voltage (VMPP), the maximum power (PMPP) value would be achieved. This concept is verified through computational simulations anda voltage control algorithm would be implemented using the Arduino Uno microcontroller for the final verification. The efficiency of the simulation is 99.88%–99.92% and an experimental is 92.84%–94.78%.
The Voltage Control in Single-Phase Five-Level Inverter for a Stand-Alone Power Supply Application Using Arduino Due Santoso, Daniel; Pratomo, Leonardus Heru
Journal of Robotics and Control (JRC) Vol 2, No 5 (2021): September (Forthcoming Issue)
Publisher : Universitas Muhammadiyah Yogyakarta

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Abstract

In the era of industrial revolution 4.0 expanded digital transformation, such as inverters. The principle of the inverter is to change the DC source to the AC source. The device using an AC source needs a voltage source that is controlled. Hence, the voltage source that is controlled is usually generated from a stand-alone power supply. The stand-alone power supply usually used a conventional inverter. The conventional inverter uses high frequency switching to obtain lower distortion harmonic in output voltage. Another solution is using a five-level inverter that has fewer power switches. The purpose in these research is to make a stand-alone power supply using a single-phase five-level inverter asymmetric topology, which has five power switches to control voltage output based on the standard of IEEE 519. The inverter does sinusoidal pulse width modulation on two the signal reference that was shifting 180 degrees toward the carrier signal. That research has been simulated using Power Simulator software and has been implemented in the laboratory. According to the result of simulation and implementation are generated voltage THD value amount of 4.39%.
Pengiriman Daya dari Inverter Lima Tingkat ke Grid Satu Fasa Menggunakan Arduino Due Kristiawan, Iwan; Pratomo, Leonardus Heru
Jurnal Teknik Elektro Vol 12, No 2 (2020): Jurnal Teknik Elektro
Publisher : Jurusan Teknik Elektro, Fakultas Teknik, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jte.v12i2.27325

Abstract

Inverter has been used for a wide variety of applications in renewable energy system. The use of inverter in a solar power plant system can off-grid and on-grid. H-Bridge inverter is one of the commonly used inverter. One of its disadvantages is the requirement of high frequency in order to get a low defect level on the output current. The use of a five-level inverter with considering the amount of a power semiconductor switch in can be as an alternative. This study aims to use a five-level inverter with five power semiconductor switches to deliver power to the grid.The working principle uses two sinusoidal signals that are shifted by 1800 compared to two carrier signals to produce a sinusoidal pulse width modulation signal. A sinusoidal pulse width modulation signal is used as a controller on each power semiconductor switch. The transmitted power is in the form of a current that is injected into the single-phase grid. The transmission of a power using five-level inverter to a single-phase grid was validated by a Power Simulator software. The final stage was a hardware implementation in the laboratory. The result shows that the inverter could transmit a power as current with 4.01% THDi, transmitted power as 36.4 Watts, and transmitted current as 0.52 Amps.
Pengendalian Tegangan Keluaran DC-DC Boost Converter Tipe Voltage Doubler Menggunakan Mikrokontroler STM32F1038CT Candra, Kevin; Pratomo, Leonardus Heru
Jurnal Teknik Elektro Vol 12, No 2 (2020): Jurnal Teknik Elektro
Publisher : Jurusan Teknik Elektro, Fakultas Teknik, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jte.v12i2.25662

Abstract

Five-level inverter is widely used in many industrial applications, for example as a three-phase electric motor drive, PLTS, etc. This inverter works using two separated DC voltage sources in order to form different voltage level. Five-level inverter using one DC voltage source will be more efficient. A DC-DC boost converter on Voltage Doubler type is used in order to solve the problem. The focus of this research is on controlling the DC-DC boost converter on Voltage Doubler type. The switch control method uses a shifted pulse width modulation of 1800. To get a suitable output voltage, an output voltage control system is applied. A proportional and integral type control is implemented using STM32F1038CT microcontroller.  The output voltage controlled DC-DC boost converter is validated through computational simulation with Power Simulator software and as the final step will be implemented on hardware in the laboratory. Based on the simulation and implementation, Voltage-Doubler type of DC-DC boost converter is able to produce the required output voltage, which is two times greater than the conventional DC-DC boost converter output voltage.
Optimalisasi Pengereman Regeneratif dengan Perubahan Sudut Eksitasi pada Pulsa Tunggal Kusumaningrum, Nazila; Riyadi, Slamet; Pratomo, Leonardus Heru; Setyawan, Florentinus Budi
Jurnal Teknik Elektro Vol 13, No 1 (2021): Jurnal Teknik Elektro
Publisher : Jurusan Teknik Elektro, Fakultas Teknik, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jte.v13i1.28600

Abstract

Most of the energy is wasted into heat energy due to conventional braking, so an optimal braking strategy is needed. A Regenerative braking utilizes the kinetic energy of the engine into electrical energy by changing the function of an electric machine into a generator. The regenerative braking system uses a Switched Reluctance Machine (SRM) which has several advantages; simple construction, does not require maintenance, and return energy to the battery. The method that can be used in the regenerative braking system of the SRM is the change of excitation angle to produce the maximum peak phase current. This study aims to optimize regenerative braking by changing the angle (θeks) using simple controls to produce energy that is greater than the battery voltage so that current may flow to the battery when braking occurs. The results of the analysis for method implementation were proven by testing the devices in the laboratory.  Based on the results of the tests, the exact angle was obtained, namely the value of θeks = 20º and the value of θkom = 170º with an initial speed of 1822 RPM, reduced into 1522 RPM by braking process, which could produce a peak current of 12,5 A and a current flowing to the battery was 5A.
Peningkatan Efisiensi Kinerja Switched Reluctance Motor dengan Metode Pergeseran Sudut Fasa Wardani, Agata Dita; Riyadi, Slamet; Pratomo, Leonardus Heru; Setiawan, Florentinus Budi
TEKNIK Vol 42, No. 3 (2021): December 2021
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v42i3.33970

Abstract

Penggerak listrik banyak digunakan pada kendaraan listrik, sebagai contoh adalah switched reluctance motor (SRM). SRM memiliki keunggulan seperti: kontruksi sederhana, perawatan mudah, performa tinggi, dan ramah lingkungan. Pengoperasian SRM membutuhkan kendali dan sensor. Deteksi posisi rotor umumnya menggunakan sensor hall effect yang akan menentukan interval eksitasi. Proses ini memiliki banyak kelemahan salah satunya adalah kepresisian. Peletakan sensor hall effect secara geometris memiliki kelemahan mencakup akurasi serta membatasi dalam pemberian eksitasi. Kelemahan peletakan sensor hall effect diantisipasi dengan rotary encoder sebagai deteksi posisi rotor. Alat tersebut memiliki tingkat kepresisian yang tinggi dan dapat mengatur sudut yang diperlukan agar lebih akurat dalam operasi SRM. Pemberian sudut eksitasi dapat dilihat dari karakteristik induktansi SRM. Sudut eksitasi yang tepat dapat menghasilkan torka optimum dan memaksimalkan kinerja SRM. Tujuan penilitian ini guna meningkatan efisiensi SRM menggunakan pergeseran sudut fasa eksitasi stator. Untuk mendukung hasil kajian dilakukan simulasi dan divalidasi dengan pengujian laboratorium. Hasil kajian menunjukkan kondisi optimal pada sudut θon= 5° θoff =20° menghasilkan arus puncak 1,2 A dan kecepatan 1650 RPM. Dari hasil tersebut diperoleh peningkatan efisiensi kinerja dengan pergeseran sudut fasa SRM terhadap torka, kecepatan dan arus yang dihasilkan.
A New Topology of a Single-Phase Five-Level Inverter Leonardus Heru Pratomo
Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 8, No 3: September 2020
Publisher : IAES Indonesian Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52549/ijeei.v8i3.1766

Abstract

The power inverter technology with low harmonics content is used for many applications, such as in new and renewable energy sector. In the last decades, some researchers explored its inverter to minimize the harmonics content, and one of the solutions is a five-level inverter. A single-phase five-level inverter has a good performance in power conversion and improved performance. Nevertheless, the conventional five-level inverter topology always deals with many power semiconductor switches and a complex control algorithm. This paper, therefore, presents a new topology of a five-level inverter using four active switches.The new topology can work well as a single phase-five-level inverter with a novel Sinusoidal Pulse Width Modulation (SPWM) control algorithm using level-phase shifted carrier strategy. The new inverter has a simple power circuit and control strategy. The verification of this research is a simulation and prototype implementation, carried out in a laboratory. The results show that the proposed control strategy is capable of achieving five-level with a simple control strategy.
Co-Authors Candra, Kevin Daniel Santoso Florentinus Budi Setiawan Kristiawan, Iwan Kusumaningrum, Nazila Setyawan, Florentinus Budi Slamet Riyadi Wardani, Agata Dita