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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) JURNAL NASIONAL TEKNIK ELEKTRO Proceeding of the Electrical Engineering Computer Science and Informatics Indonesian Journal of Electrical Engineering and Computer Science Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Andalasian International Journal of Applied Science, Engineering, and Technology Andalas Journal of Electrical and Electronic Engineering Technology Jurnal Andalas: Rekayasa dan Penerapan Teknologi ASEAN Marketing Journal Jurnal INFOTEL Jurnal Ecotipe (Electronic, Control, Telecommunication, Information, and Power Engineering)

Refdinal Nazir

Universitas Andalas

Author-ID : 2400027

Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Mechanical Engineering Medicine & Pharmacology Social Sciences Other

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Pengaturan Keseimbangan Pengisian dan Pengosongan Baterai Asam Timbal Mochammad Rismansyah; Refdinal Nazir
JURNAL NASIONAL TEKNIK ELEKTRO Vol 5 No 2: Juli 2016
Publisher : Jurusan Teknik Elektro Universitas Andalas

In this paper proposed a system of balance settings for charging and discharging the lead-acid battery using a microcontroller arduino uno 16U2. The calculation of battery capacity using the method of As (Ampere-second). Before this is done, the value of the energy stored in the battery is calculated using the relationship between the battery capacity (SOC) and the open-circuit voltage of the battery. The microcontroller will do the calculations for the system running using any current relationships in the system. Settings are separated between setting the maximum point and minimum point battery battery. Setting the maximum point guard of excess charging batteries. When the battery is full, the current discharge / disposal will flow which prevents the battery charging when it reaches the maximum point. 0153 constant exhaust flow set point A. Setting minimum keep the battery from the void (lack of energy). Load will not get a good supply of energy or battery charger when the battery below the minimum point because the charger is only charging the battery to pass the minimum point. This system uses the point of 11.67% with a minimum capacity of 50 Ah battery. System settings are made has managed to keep the battery from overload conditions and under loading.Keywords : Lead-acid Battery, mosfet, charging and discharging, arduino uno microcontroller Abstrak—Dalam tulisan ini diusulkan suatu sistem pengaturan keseimbangan pengisian (charging) dan pengosongan (discharging) pada baterai asam timbal menggunakan mikrokontroler arduino uno 16U2. Perhitungan kapasitas baterai menggunakan metoda As (Ampere-second). Sebelum sistem ini dijalankan, nilai energi yang tersimpan pada baterai dihitung menggunakan hubungan antara kapasitas baterai (SOC) dan tegangan open circuit baterai. Mikrokontroler akan melakukan perhitungan selama sistem berjalan menggunakan hubungan setiap arus pada sistem. Pengaturan dipisahkan antara pengaturan titik maksimal baterai dan titik minimal baterai. Pengaturan titik maksimal menjaga baterai dari kelebihan pengisian. Saat baterai telah penuh maka arus peluahan/pembuangan akan mengalir yang mencegah baterai mengalami pengisian saat mencapai titik maksimum. Arus pembuangan diset konstan 0.153 A. Pengaturan titik minimum menjaga baterai dari kekosongan (kekurangan energi). Beban tidak akan mendapatkan pasokan energi baik dari charger maupun baterai saat baterai dibawah titik minimumnya karena charger hanya melakukan pengisian pada baterai hingga melewati titik minimumnya. Sistem ini menggunakan titik minimum 11.67% dengan kapasitas baterai 50 Ah. Sistem pengaturan yang dibuat telah berhasil menjaga baterai dari kondisi kelebihan muatan dan kekurangan muatan.Kata Kunci : Baterai asam timbal, mosfet, pengisian dan peluahan, mikrokontroler arduino uno

Optimization of the Hybrid System for Micro Hydro, Photovoltaic and Biomass Power Generation in Senamat Ulu Village Using Homer Simulation Elsi Alfionita Syawal; Refdinal Nazir
JURNAL NASIONAL TEKNIK ELEKTRO Vol 10, No 2: July 2021
Publisher : Jurusan Teknik Elektro Universitas Andalas

Currently, the supply of electrical energy is still not fulfilled in some areas due to the depletion of conventional energy sources and fossil energy. The ideal alternative energy is renewable energy that does not have the potential to run out such as solar energy, biomass and water. Senamat Ulu is a village in Bungo Regency that has the potential for biomass power generation because it has a lot of palm oil plantations covering an area of 3,917 hectares with an average production of 6,901 tons per year. Based on the coordinates of the center of the village, simulation Homer scored solar radiation of 4.43 kWh / m2/ day for Ulu Senamat area. The purpose of this research is to obtain the amount of biomass energy potential and the optimal model for the hybrid system of power generation in Senamat Ulu Village. From the results of the study, it was found that the potential for electrical power from the biomass power plant in Senamat Ulu was 6,113.65 kW consisting of 2,189.08 kW shells and 3,924.57 kW palm fiber. The most optimal generator model is simulation I in terms of the smallest NPC and COE economies, namely NPC $ 275,091 and COE $ 0.0768/kWh where Biomass is 49,946 kWh/year at a cost of $ 0.0271/kWh, PV 26,681 kWh/year with electricity price of $ 0.107/kWh, Micro hydro 156.025 kWh/year with electricity price of $ 0.00992/kWh, Storage Li-ion 8,643 kWh/year and converter 288,331 kWh/year and the time required to payback is 5.8 years.Keywords: Optimization, NPC, COE

Sensorless Solar Tracker Based on Sun Position for Maximum Energy Conversion Syafii Ghazali; Refdinal Nazir; Kamsory ,
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 2: EECSI 2015
Publisher : IAES Indonesia Section

The performance of solar panels is dependent on sunlight it receives. Therefore, it is necessary to design a device that can set the direction of the solar panel always follows the sun position based solar tracker. The two-axis sensorless trackers have used in this research to produce maximum energy conversion. Position of solar panel move based on sun position using sunrise and sunset database. By using linear interpolation the sun position in latitute and longitude for other time can be obtained during a day. Based on these value the solar panel set its position using two servo motor which drived by Arduino. This technique independent from weather conditions, although cloudy, panel position remains consistent with the maximum illumination when the weather is sunny back later. By this way, the solar panel absorbs maximum sunlight and generate maximum electricity.

Harmonic Effects Analysis of Electronic Loads Controller On Self Excited Induction Generator (SEIG) Operations Refdinal Nazir; Andi Pawawoi; Riska Amalia
Indonesian Journal of Electrical Engineering and Computer Science Vol 8, No 2: November 2017
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v8.i2.pp273-280

The aplication of Electonic Load Controller (ELC) on Self-Excited Induction Generator (SEIG) driven by renewable energy sources creates harmonic issues. This paper has analyzed the propagation of the harmonic current generated by the ELC in the generator system. Mathematical modeling and computer simulation is used to analyze the propagation of harmonic currents generated by ELC on the generator system. Laboratory testing has also been conducted to justify the simulation results. The study results showed that the propagation harmonic currents created by ELC on the stator widings of SEIG and main load side are rejected for high order components, and attenuated for lower order components. Consequently, the THDI of stator and main load current will be reduced significantly.

Analysis of energy losses reduction potential on the distribution line of campus building through electric power quality improvement Andi Pawawoi; Zuheldi Zuheldi; Fajril Akbar; Refdinal Nazir
Indonesian Journal of Electrical Engineering and Computer Science Vol 17, No 2: February 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v17.i2.pp868-876

In public and commercial buildings, the reduction of electricity consumption activities can be conducted through 3 paths, including improving the quality level of electric power, increasing the efficiency of electrical equipment, and reducing the waste of electric energy use. In this paper, the energy losses reduction potential on the distribution line of Engineering Faculty, Andalas University buildings through electric power quality improvement are analyzed. Power Quality (PQ) variables that considered in this analysis include power factor, unbalance current load and harmonics distortion. Analysis of correlation between PQ variables is required to determine the power loss on the distribution line of buildings. Using data of PQ variables recorded by Fluke Power Analyzer 435 series II, the energy losses of the distribution line without/with PQ improvement for each building is calculated. Analysis results have shown that the reduction potential is proportional to the value of PQ variables. Administrative faculty building with poor power quality has the potential to reduce its energy losses on the distribution line by 52.62% through power quality improvement. Civil engineering building group with quite good power quality only has the potential to reduce energy losses by 32.81%. Overall, the buildings in this faculty have the potential to reduce energy losses on distribution lines by 34.42% through its power quality improvement.

Analysis of Electronic Load Controller with Bidirectional Converter in Self-Excited Induction Generator Andi Pawowoi; Wahyu Rizki Muslyadi; Refdinal Nazir; Fajril Akbar
JURNAL NASIONAL TEKNIK ELEKTRO Vol 11, No 2: July2022
Publisher : Jurusan Teknik Elektro Universitas Andalas

Induction generators are widely used in small-scale power plants driven by renewable energy, such as wind, mini/micro-hydro, tidal wave, biomass, biogas, etc. In applying this generator to a micro-hydropower plant, it is usually equipped with an ELC (Electronic Load Controller), which regulates the frequency to remain constant at a safe tolerance limit (49.8 – 50.2 Hz). However, this system is still not optimal because the ELC dumps its excess power into the dummy load. This paper proposes an ELC system that can adjust the frequency to remain constant without wasting excess power from the generator. This system uses the working principle of a bidirectional converter, which can regulate the flow of power from the generator and dummy load in two directions. In the proposed system, the dummy load uses a battery to store excess electrical energy and be utilized and reused when needed. Performance analysis of the proposed system uses simulation with MATLAB Simulink software. The induction generator used has a voltage specification of 380 Y, 50 Hz, 1420 rpm, 3.5 A, and 1.5 kW. The analysis results show that the developed ELC design can adjust the frequency in the value range of 49.98-50.01 Hz during load changes with a range of 955 Watt to 1.045 Watt, with the response time reaching its steady-state value of 0.1-0.4 seconds.

Identification of Power Plant Operation and Loading Problems at Ngalau Baribuik Micro Hydro, Padang Refdinal Nazir; Andi Pawawoi; Melda Latif; Muhammad Imran Hamid; Pinto Anugrah; Eka Fitrianto; Ahmad Ahmad
Jurnal Andalas: Rekayasa dan Penerapan Teknologi Vol. 1 No. 2 (2021): Desember 2021
Publisher : Jurusan Teknik Elektro, Universitas Andalas

Ngalau Baribuik Micro-hydro Power Plant (MHP) is located in Bukit Karang Putih, Lubuk Kilangan, Padang City. This MHP with a capacity of 10 kW belongs to the local community which has been operating since 2012. This MHP was built with the aim of meeting the electricity needs of the people of Nagari Ngalau Baribuik who are not covered by electricity from PLN. Based on the information obtained from the MHP management, until now the operating profile and loading pattern of the MHP which is managed independently by the community has not been identified. To overcome this problem, a community service activity was carried out to minimize the failure of the MHP in meeting the needs of the community and the worst possibility was that there was damage to the generator. The target of this activity is the people of Nagari Ngalau Baribuik who are consumers of the MHP. Through this community service activity, the people who are consumers of the Nagari Ngalau Baribuik MHP have understood the importance of saving energy to maintain the sustainability of the MHP. People also know tips for saving energy that they can apply in their daily lives. Efforts to transfer knowledge to the community have been successfully carried out through this activity.

E-travel Adoption by Small Travel Enterprises (STEs): An Initial Study in Indonesia and Malaysia Pujani, Vera; Yahya, Yazrina; Alfitman, Alfitman; Nazir, Refdinal
ASEAN Marketing Journal Vol. 7, No. 1
Publisher : UI Scholars Hub

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

This paper aims to investigate e-travel adoption of tourism industries in Indonesia and Malaysia particularly by STEs. The qualitative research was undertaken using case analysis from in-depth interviews of 10-STEs as intial study both in Indonesia and Malaysia. The finding result of e-travel adoption by STEs in a cross-cultural study was identified from the findings present in the initial study based on personal, organizational and website characteristics. The majority of personal characteristics were relatively similar in both countries. However, few differences are present in organizational and website characteristics. E-travel adoption in both countries is influenced by the business experiences of owners/managers, various technological aspects, and the nature of use and benefits. The following study, the user-based survey would be undertaken to complete The e-travel adoption model in Indonesia and Malaysia.

Electric Load Modeling for Managing Electric Energy Consumption Through the PDCA Cycle in the Library Building of Andalas University Refki Budiman; Refdinal Nazir
Andalas Journal of Electrical and Electronic Engineering Technology Vol. 3 No. 1 (2023): May 2023
Publisher : Electrical Engineering Dept, Engineering Faculty, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/ajeeet.v3i1.35

The need for electrical energy in the public building sector is quite dominant, reaching 33-40% of the total energy consumption of all sectors. To control electrical energy in buildings effectively, an Energy Management System (EMS) is needed. EMS stage consists of Plan-Do-Check-Act (PDCA). The study conducted in this research is on how to use the PDCA cycle method to model the consumption of electrical energy in campus buildings in a sustainable manner. Modeling of energy-efficient electrical loads is formed in several ways: modeling by replacing T8 fluorescent lamps and CFLs with LED, modeling by replacing non-inverter AC with inverter AC, modeling by the number of library visitors, modeling by improving the power factor, and finally, modeling with a combination of the four previous models. Modeling using LEDs results in savings of 1,464 kWh per month; inverter AC modeling saves 1742 kWh per month; modeling by adjusting the number of visitors saves 857 kWh per month; and modeling by improving the power factor saves 56 kWh per month. This electrical load modeling can save up to 8 kW of power outside of the library's operating hours. Meanwhile, during operational hours, the modeling library can save up to 30 kW of electric power

Perancangan Sistem Smart Egg Incubator sebagai Optimalisasi Pemanfaatan Energi Terbarukan di Ngalau Baribuik, Padang Refdinal Nazir; Andi Pawawoi; Melda Latif; Muhammad Imran Hamid; Pinto Anugrah; Eka Fitrianto
Warta Pengabdian Andalas Vol 30 No 2 (2023)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jwa.30.2.304-313.2023

Micro Hydro (PLTMH) Ngalau Baribuik, Padang - West Sumatra, has operated since 2012. It is currently the only source of electricity for the local community, some of whom work as chicken breeders. Based on community service activities in 2021, information was obtained that the PLTMH's electricity had yet to be utilized optimally. Meanwhile, chicken breeders also needed egg incubators to increase their productivity. This community service activity aims to design an IoT-based automatic egg incubator to optimize the use of renewable energy. Activities started with field visits, making initial plans, designing and testing the machine, handing over the machine, and disseminating knowledge. The designed a smart egg incubator worked well after a 21-day hatching test for chicken eggs. The IoT technology installed on the device also functions appropriately and can show real-time temperature and humidity on mobile devices.

Co-Authors ,, Kamsory Adytia Putra, Ryan Ahmad Ahmad Alfitman Alfitman Alfitman Alfitman Amalia, Rizka Andi Pawawoi Andi Pawowoi Arief Rufiyanto Asnil Asnil Axel Doriza Dewi Purnama Sari Diana, Mery Eka Fitrianto Eka Fitrianto Eka Fitrianto Eka Fitrianto, Eka Elsi Alfionita Syawal Fajril Akbar Fitrianto, Eka Ghazali, Syafii Hamdi Reza Hasmat Malik Hidayat, Rahmat Kamsory , Kamsory Kamsory, Kamsory Kananda, Kiki Kiki Kananda Krismadinata Krismadinata, Krismadinata Kurniasih, Novi Melda Latif Melda Latif Mery Diana Mochammad Rismansyah Muhammad Hadi Putra, Muhammad Hadi Muhammad Imran Hamid Muhammad Nasir Muhammad Nurdin Muhammad Rahman Muharram, Igo Cikal Novi Kurniasih Pinto Anugrah Purnama Sari, Dewi Rahmat Hidayat Refki Budiman Reza, Hamdi Rika Ampuh Hadiguna Riska Amalia Rismansyah, Mochammad Rizka Amalia Rufiyanto, Arief Ryan Adytia Putra Saputra, Dendi Adi Syafii . Syafii Ghazali Vera Pujani Vera Pujani Wahyu Rizki Muslyadi Yazrina Yahya Yazrina Yahya Yudi Arfan Zuheldi Zuheldi Zuriman Anthony Zuriman Anthony

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