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All Journal International Journal of Applied Power Engineering (IJAPE) TELKOMNIKA (Telecommunication Computing Electronics and Control) Journal of Multidisciplinary Academic Jurnal Sains dan Teknologi Reaksi Indonesian Journal of Electrical Engineering and Computer Science Jurnal Malikussaleh Mengabdi
Nelly Safitri
Politeknik Negeri Lhokseumawe
Religion Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Electrical & Electronics Engineering Engineering Environmental Science Materials Science & Nanotechnology Social Sciences Other

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Wireless Data Communication Techniques to Coordinate Distributed Rooftop PVs in Unbalanced Three-phase Feeder Rachmawati Rachmawati; Anita Fauziah; Nelly Safitri
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 16, No 3: June 2018
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v16i3.7780

Abstract

A necessity of the availability of communication network to provide data transfer amongst the coordinated single-phase rooftop photovoltaic (PV) in unbalanced three-phase low voltage (LV) feeder is essential since fetching data within the sensor of each PV unit requires real-time measurement and reliable data exchange within smart grid (SG), loads and other PV units. The main objective of this paper is to model the popular Wi-Fi, WiMax and ZigBee wireless data communication techniques into algorithms using numerical analysis. Those communication technologies have low cost and low power consumption. The benefits and drawbacks of those considered wireless data communications are shown as the required data that transferred and appropriate coding is also proposed. The number of transmitted symbols and the processing time delay of the proposed data coding are numerically analyzed, the results indicated that the 100% penetration level of PV that resulted higher injected reactive power back into the networks is able to be overcome since the coordinated PVs along the feeder is communicating to lower the unbalanced voltage profile.
Non-uniform Rooftop PVs Distribution Effect to Improve Voltage Profile in Residential Feeder Zamzami Zamzami; Nelly Safitri; Fauzi Fauzi
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 16, No 4: August 2018
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v16i4.7789

Abstract

This paper presents the simple design of a grid-tied single-phase with distributed rooftop photovoltaic (PV) non-uniformly location and ratings. All the inclusion components in the developed scheme are estimated and defined as the inevitability of low voltage (LV) residential network. This developed scheme is purposed for allocating AC and DC load, which are divided into four steps: the sized determination of PV inverter (1-5kW), the selection of PV array, the size determination of battery and the selection of other supporting components. The purposed configuration consists of modeling the system with non-uniform distributions of rooftop PVs, modeling the rooftop PVs based on their injected active and reactive power, and finally the inclusion of battery storage, based on its state of charge (SOC). Due to test the configuration, several cases are built in the MATLAB platform. Simulation results have been generated and analyzed for an unbalanced three-phase residential feeder which is populated with rooftop PVs and battery storage (BS). The simulation results show that the unbalanced reduction due to the coordinate of PVs and BS that provided educated energy storage when the unequal loadings are there, have significant effect toward the anxiety of the distribution network are successfully done.
Harmonic Impact in Induction Generator Voltage Using Thyristor Control Reactor Suprihardi Suprihardi; Yaman Yaman; Zamzami Zamzami; Nelly Safitri
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 16, No 3: June 2018
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v16i3.7788

Abstract

As commonly known that theload fluctuations that have been performed on an induction motor operated as an induction generator (IG) triggers unstable induced voltage and frequency. Asthe result, the load that receiving the power quality is not running properly and the efficiency is low. The problems that have beenmitigated in this research in such way is the stability of the voltage that generated by IG due to fluctuating loading, and the harmonics can be damped by single tuned due to the work of thyristors and non-linear loads. The used method is the Ziegler-Nichols method by measuring and testing the design of prototype to get the best performance in stabilizing the voltage by using thyristor control reactor (TCR). The results showed that the induced generator with single tuned filter and TCR to nonlinear load variation at 1618 RPM is maintained stably for the voltage and frequency. Although, 3rd order harmonics of voltage and current that has been tuned can be dampedby using THDI 8.36%. Furthermore, it can be said that the response that generated by voltage control system using proportionalintegral (PI) control in 1kW-4 poles three-phase IG with additional and reductionalload generated a stable response.
Integrated arrangement of advanced power electronics through hybrid smart grid system Nelly Safitri; A. M. Shiddiq Yunus; Fauzi Fauzi; Naziruddin Naziruddin
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 18, No 6: December 2020
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v18i6.13433

Abstract

As an enabler component for renewable energy integration, power electronics (PE) technology in smart grid system is one of the most important issues of development the electrification, decentralization and information-technology/operation-technology (IT/OT) digitization within the electrical energy transmission and distribution systems. The arrangement of PE may different along the feeder either for grid-connected photovoltaic (PV), wind turbine, fuel cells, wave energy system and battery storage unit, respectively.This is due to the electric voltage that might need to be converted from alternating current (AC) to direct current (DC) and vice versa. For that reason, this paper proposed a concept of advanced PE as an integrated arrangement of several AC/DC/AC-and DC/AC- converters in such ways that support thepreviously mentioned grid-connected hybrid renewable energy sources and distributed generators (DGs) along the distribution feeder. Additionally, for the system that supported by battery storage unit, then this hybrid smart grid concept might become the answer for future utility needs.
Direct-DC Power System Generation Based on Single-Phase Rooftop Photovoltaic in Residential Low Voltage Feeder Siti Amra; Nelly Safitri; Akhyar Akhyar; Usmardi Usmardi
Journal of Multidisciplinary Academic Vol 1, No 1 (2017): Science, Engineering and Social Science Series
Publisher : Penerbit Kemala Indonesia

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

Abstract

The trend of converting direct current (DC) system into alternating current (AC) using inverter becomes common since the system efficiency appropriately improves. Additionally, the mitigation on direct-DC power system requires transformer and inverters inside the appliances due to lower and convert the 230VAC into useable DC voltage. This paper proposes the direct-DC power system generation based on single-phase rooftop photovoltaic (PV) in the residential low voltage (LV) feeder. The proposed simulation designates the power system components included in the modeling of the AC and direct-DC houses, which the included power system components downstream of the PV array. The efficiency of direct-DC power supply, grid interactive inverter and charge controller are simulated. The results show that the peak curve efficiency of direct-DC power supply has DC power input narrow to 400VDC. It is then become 2% higher than 220VAC power input. While the inverter with multiple MPPT efficiency curve has the peak of 96-97% after 30% loads, while when it is partly loads, with the power capacity below 1000W, has peak at range of 86-95%. Then the efficiency curve of charge controller with MPPT for partly load scheme below 30W output power the peak is about 90-94%.
APPLICATION OF DRYING BLOWER OVEN TECHNOLOGY TO SPICES FOR THE PRODUCTION OF INSTANT SEASONING POWDER Syafruddin Syafruddin; Teuku Rihayat; Awanis Ilmi; Rika Annisa; Nelly Safitri; Muhammad Nasir
Jurnal Sains dan Teknologi Reaksi Vol 20, No 02 (2022): Jurnal Sains dan Teknologi Reaksi
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v20i02.3402

Abstract

ABSTRAKDi Aceh, banyak bumbu instan masakan Aceh yang dijual dalam bentuk bumbu basah. Bumbu instan basah ini menjadi pilihan masyarakat Aceh untuk mempersingkat waktu memasak. Bumbu instan basah ini tidak dapat dipasarkan ke luar daerah karena umur simpannya yang tidak tahan lama dan tidak praktis untuk dibawa-bawa. Dengan inovasi masakan Aceh bumbu instan berupa bubuk kering dapat mendorong industri makanan lokal Aceh. Teknologi yang digunakan adalah Oven Drying Blower yang akan digunakan sebagai teknologi pengeringan bahan baku bumbu menjadi bumbu masak yang praktis Penelitian ini bertujuan untuk mengetahui karakteristik pengeringan rempah-rempah dengan mengukur perubahan suhu, kelembaban relatif, penurunan berat bahan, laju aliran udara, laju aliran volume udara, kadar air bahan terhadap waktu, laju pengeringan terhadap waktu, dan laju pengeringan terhadap kadar air. Bumbu instan Aceh Spices juga akan dilakukan persyaratan yang sesuai dengan pengujian kadar abu, pengujian kadar air, dan pengujian organoleptik. Penelitian ini menggunakan metode deskriptif proses pengeringan dipakai suhu di bawah 55˚C diulang sebanyak 3 (tiga)  kali sampai mencapai kadar air 8 – 10 %bk. Hasil pengamatan menunjukan bahwa selama proses pengeringan tercatat Rh luar alat pengering antara 83,28%-89,50%. Juga Rh di dalam alat pengering diamati dan dicatat berkisar antara 86,58%-97,91%. Kadar cabai merah selama proses pengeringan mengalami penurunan dari 38,75% turun hingga rata – rata 18,05% dengan perincian pada ruang satu dan dua mencapai 17,4%, ruang tiga dan empat 16,95% dan ruang lima dan enam 16,6%. Dengan waktu pengamatan selama 4 jam. Kata Kunci : Rempah Aceh, Drying blower oven, Rempah-rempah kering, Instant seasoning powder.
Characterization and Physical Propertiesof Terpene Compound in Citronella Essential oil as Sources of Antibacterial Perfume Teuku Rihayat; Rizal Syahyadi; Hismendi Hismendi; Nelly Safitri; Aida Safitri
Jurnal Sains dan Teknologi Reaksi Vol 20, No 02 (2022): Jurnal Sains dan Teknologi Reaksi
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v20i02.3403

Abstract

ABSTRACT Along with the development of modern industries such as the perfume, cosmetic, food, aromatherapy and pharmaceutical industries, the world's need for essential oils is increasing every year. Several parameters developed in this article include the effect of pressure (1, 2, 4, 6, 8) mmHg and time (20, 40, 60) minutes until final boiling point on the volume of oil produced and geraniol concentration. The analysis carried out was GCMS analysis and bacterial activity in the application of perfume products. From the research results it was found that at 1 atm pressure the geraniol concentration increased by 50% to 80.11%. Apart from these compounds, other compounds were also obtained such as citronellol, rhodinol and cheprol. at this pressure also produced the highest product volume of 21.2 ml. The application of the product resulting from the vacuum distillation process in the form of an anti-bacterial perfume at an incubation time of 48 hours has the strongest anti-bacterial activity with a diameter of 10.13 mm against Staphylococcus aureus bacteria.Keywords: Characterization, Citronella Oil, Vacuum Distillation, Perfume, Terpene
DISTILASI MINYAK GAHARU UNTUK BAHAN BAKU MINYAK WANGI DENGAN MEMANFAATKAN SUMBER ENERGI MATAHARI (PHOTOVOLTAIC) Nelly Safitri; Suprihardi Suprihardi; Ridwan Ridwan; Teuku Rihayat; Nurhanifa Aidy; Een Setiawati
Jurnal Sains dan Teknologi Reaksi Vol 20, No 02 (2022): Jurnal Sains dan Teknologi Reaksi
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v20i02.3389

Abstract

ABSTRAKPemanfaatan sistem photovoltaic untuk mendapatkan enegi listrik dengan menggunakan sistem photovoltaic. Sistem Photovoltaic merupakan suatu modul yang digunakan untuk menyerap panas yang terpapar oleh sinar matahari yang diubah menjadi energi listrik. Tujuan dari peneilitian ini adalah penggunaan modul (panel surya) dengan kapasitas 100 wp dapat menyerap panas yang dikonversikan menjadi energi listrik sebanyak 100 watt/jam yang nantinya diharapkan dapat menjadi penganti listrik konvensional yang akan dimanfaatkan untuk proses penyulingan. Perlakuan yang dilakukan dengan memvariasi waktu penyulingan minyak gaharu divariasikan dalam 3 jam, 4,5 jam dan 6 jam dan waktu perendaman bahan baku juga divariasikan dalam 14 hari, 16 hari, 18 hari dan 20 hari. Pengujian minyak nilam hasil penyulingan menggunakan solarcell dengan memanfaatkan metode photovoltaic untuk analisa senyawa menggunakan kromatografi Gas-Spektrometri Massa (GC-MS) senyawa kimia yang terindentifikasi memiliki % luas terbesar adalah gualiol yaitu sebesar 52,75%, selinene sebesar 17,80% dan panasinsen yaitu sebesar 5,90%. Pelakuan perendaman selama 18 hari dengan waktu operasi selama 6 jam. Sedangkan pada pengujian kerapatan dari minyak gaharu diperoleh nilai tertinggi pada waktu destilat selama 3 jam dengan lama perendaman 16 hari yaitu sebesar 0,8894 kg/cm3. Waktu penyulingan berpengaruh terhadap berat jenis minyak, semakin lama proses penyulingan maka, semakin meningkat berat jenis yang diperoleh. Kata kunci : Penyulingan; Essensial oil; Photovoltaic;
Simulation of photovoltaic station interfacing scada within transmission line Zamzami Zamzami; Nelly Safitri; Muhammad Arhami; Naziruddin Naziruddin
Indonesian Journal of Electrical Engineering and Computer Science Vol 30, No 3: June 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v30.i3.pp1269-1278

Abstract

In this paper, a developed simulation of a photovoltaic (PV) station that includes a PV module, a grid-connected inverter, a maximum power point tracking (MPPT) system, and a DC link capacitor was discussed. The MPPT uses a proportional integral derivative (PID) incremental conductance controller. Due to make it simple to control and monitor the PV station, Simulink dashboard is used to develop an interface that resembles a supervisory control and data acquisition (SCADA) system. Then the faults circumstances were simulated on one of the circuits of the double circuit transmission line using the faults combo box that is accessible in the interface. Then the cases were developed to examine the impact of various faults on the operation and control of the solar station. The developed cases namely normal circumstance, single-phase to ground fault circumstance, double-phase fault circumstance, and three-phase to ground fault circumstance, respectively. Three-phase voltage and current at given fault conditions have been measured to control voltage sag and swell. The active and reactive power are also measured due to obtain that they are injected or absorbed the power from and to the transmission line and maintain toward their setpoint values as indications while the faults occurred.
Innovation of control valve motorization method for regulating turbine rotation in micro hydro generators Hardi, Supri; Safitri, Nelly; Yaman, Yaman; Radhiah, Radhiah; Jamaluddin, Jamaluddin
International Journal of Applied Power Engineering (IJAPE) Vol 14, No 1: March 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijape.v14.i1.pp90-100

Abstract

The method of transferring the main load to the dummy load is still used in micro hydropower plants. Because the turbine and generator are constantly operating at maximum capacity, the load transfer system, also known as the electronic load control (ELC) system, is ineffective and inefficient. The researcher devised a method for controlling the pressure/flow rate on the branch pipe by using a control valve motorized (CVM). Control valve motorized (CVM) is responsible for the opening and closing of branch pipelines using an electric motor. The goal is to achieve voltage and frequency stability by using CVM to adjust the flow/pressure of water in the branch pipe. The method involves designing and testing the CVM system via a Pelton turbine module connected to the generator. The results of testing the Pelton turbine module with a pressure of 4 kg/cm2 on a 34-inch pipe show that the turbine rotates at 800 rpm. Brushless direct current (BLDC) generator with 12 poles and a Pelton turbine. The proportional integral derivative (PID) controller control parameters are calculated by the control system using the Nichols-Ziggler method, with tuning results of PB 130%, Ti 2.8 seconds, and Td 0.7 seconds. A frequency of 50 Hz and a voltage of 61 volts is produced by controlling the set point (SP) at 55% of the process variable (PV) and the manipulated variable (MV) to CVM at 38%, respectively. The conditions are implemented by varying the load on the system by connecting and disconnecting the load; the system remains stable for 5 seconds.
Co-Authors A. M. Shiddiq Yunus Aida Safitri Akhyar Akhyar Anita Fauziah Arhami, Muhammad Awanis Ilmi Een Setiawati Elwina Fachraniah, Fachraniah Fauzi Fauzi Hardi, Supri Hismendi Hismendi Jamaluddin Jamaluddin Muhammad Nasir Naziruddin Naziruddin Nurhanifa Aidy Rachmawati Rachmawati Radhiah, Radhiah Ridwan Ridwan Rika Annisa Rizal Syahyadi Siti Amra Suprihardi Suprihardi Suprihardi Suprihardi Syafruddin Syafruddin Teuku Rihayat Usmardi Usmardi Yaman Yaman Yaman Yaman, Yaman Zamzami