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All Journal Mechatronics, Electrical Power, and Vehicular Technology TELKOMNIKA (Telecommunication Computing Electronics and Control) PROCEEDING IC-ITECHS 2014 JEEMECS (Journal of Electrical Engineering, Mechatronic and Computer Science) Energi & Kelistrikan JAREE (Journal on Advanced Research in Electrical Engineering) Jurnal Techno Bahari Jurnal Nasional Teknik Elektro dan Teknologi Informasi
Renny Rakhmawati, Safira Nur Hanifah, Renny Rakhmawati,
Politeknik Elektronika Negeri Surabaya
Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Mechanical Engineering Transportation

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LIGHTING SYSTEM WITH HYBRID ENERGY SUPPLY FOR ENERGY EFFICIENCY AND SECURITY FEATURE OF THE BUILDING Safira Nur Hanifah, Renny Rakhmawati,
PROCEEDING IC-ITECHS 2014 PROCEEDING IC-ITECHS 2014
Publisher : PROCEEDING IC-ITECHS 2014

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Abstract

Recently, many buildings’ outside corridors have less lighting system at night, becausetheir lamps mostly depend upon electrical energy from PLN (State Electrical Company). It affects the whole electrical power used. Due to this condition, we need to arrange the lamps’ light  to  reduce  electrical  power.  This  research  is  going  to  create  an  automatic  lighting efficiency system which is located outside of the building’s corridor; and it uses time setting with the application of RTC (Real Time Clock) to detect human motion with motion-sensor detector  (PIR).  The  primary  aim  of  this  research  is  to  manage  electrical  energy  more efficiently and to make a safety measure for the building itself. When PIR sensor detects any motion in safety-time-range that has been set before, it will send a short message to the central security system. It is supplied by hybrid system between solar cell and PLN electrical power. Though the use of the solar cell, an output voltage of 17-19 volt will be reduced through the buck converter to stabilize enough  while filling 12-volt the accumulator. The output electrical voltage derived from accumulator will be converted from 12 Vdc  to 12 Vac by an inverter; and then it will be increased to 220 Vac by step up voltage regulator to supply its lighting load. Otherwise, if the accumulator is not able to fulfill the supply, a microcontroller will force swith circuit to gain the lighting load another supply from PLN electrical power source. By implementing this management system, total energy within 10 hours (17.00-03.00 WIB) is 420Wh; and it reduces the energy for 105 Wh with 25% efficiency.
Rancang Bangun Alat Pengering Buah Kelapa Guna Produksi Kopra Menggunakan Kontrol PI Renny Rakhmawati,St.,MT
Techno Bahari Vol 3 No 1 (2016)
Publisher : Politeknik Negeri Madura

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Abstract

Proses pembuatan kopra dengan cara tradisional adalah dengan menjemur buah kelapa dengan bantuan sinar matahari selama kurang lebih 5 – 7 hari dengan kondisi cuaca cerah. Jika dilihat dari segi kebersihan kelapa yang dikeringkan dengan menggunakan konsep secara tradisional memiliki tingkat higenis yang kurang karena pada waktu proses pengeringan bahan terpapar oleh zat – zat lain yang berupa debu maupun jamur. Pada umumnya kadar air pada buah kelapa sebelum dikeringkan sebesar 53 – 55 % sehingga kelapa perlu dikeringkan untuk mencapai kadar air sebesar ±5%.   Dalam proses pengeringan buah kelapa akan digunakan heater sebagai sumber panas dan blower fan yang berfungsi untuk sirkulasi udara panas dalam ruang pengering agar merata secara keseluruhan. Menjaga kondisi suhu agar dalam kondisi yang stabil dalam proses pengeringan sesuai dengan set point 70o C maka digunakan rangkaian pengatur tegangan ac – ac controlled yang kan diproses menggunakan kontrol PI ( Proportional Integral ) . Sudut penyulutan akan diatur oleh rangkaian IC TCA 785. Besar sudut penyulutan akan diatur dengan tegangan kontrol yang dibangkitkan oleh rangkaian DAC R/2R yang akan mengubah nilai digital menjadi nilai analog berupa tegangan sebagai referensi sudut penyulutan pada rangkaian TCA. Sistem monitoring sistem akan ditampilkan dengan menggunakan LCD 16 x 2 dan menggunakan program visual studio yang akan menampilkan kondisi suhu , arus , tegangan dan kelembaban pada ruang pengering. Proses pengeringan buah kelapa dengan kadar air awal dari 53 – 55% menjadi ±5% dengan durasi waktu 18 jam.
AC-AC Voltage Controller of Power Supply for Heater on Drying System Renny Rakhmawati; Farid Dwi Murdianto
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.v16i3.5194

Abstract

The coconut fruits is very useful to be processed into cooking oil and it can meet the needs of cooking for Indonesia people, But before the coconuts processed into oil, The coconuts should be dried first. Usually the drying process is manually, that is dried in the sun. Unfortunately this way is not hygienic and can’t be done continuously, causing the coconut fungus overgrow. This paper proposes methode to solve the problem above.This research makes the dryer coconut fruitssystem by using the heater.Dryer system used for dry some coconut fruits that must be reduced the water content up to 5%, this dry coconutis called copra. System requires heater which will be regulated the temperature. Heater temperature setting is done by adjusting the heater supply voltage, and this is the task of ac to ac voltage controller. Ac to ac voltage controller is a circuit converter is capable converting ac voltage with value 220 Vrms at 50 Hz frequency and have waveform pure sinusoidal become ac voltage frequency at 50 Hz with an output voltage suitable with our need but the voltage waveform not impure sinusoidal or defective as a result firing angle effects. The output voltage which we set determines the value of the heater temperature. The output voltage is set from the firing angle of the triac component using the addition and decreasing angle values. Based on the results of experiments that have been done, if the drying chamber which has volume 135.2 liters and the temperature regulated at 700 C then the heater with a power requirement of 400 W should receive supply 216 V from ac to ac voltage controller. So the triac of ac to ac voltage controller fired on 0.55 radians so that the to ac voltage controller that gets 220 V input voltage can produce 216 V output voltage.
Lighting System With Hybird Energy Supply For Energy Efficiency and Security Feature of the Building Renny Rakhmawati; Safira Nur Hanifah
IC-ITECHS Vol 1 (2014): Prosiding IC-ITECHS 2014
Publisher : IC-ITECHS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1483.508 KB)

Abstract

Recently, many buildings’ outside corridors have less lighting system at night, because their lamps mostly depend upon electrical energy from PLN (State Electrical Company). It affects the whole electrical power used. Due to this condition, we need to arrange the lamps’ light to reduce electrical power. This research is going to create an automatic lighting efficiency system which is located outside of the building’s corridor; and it uses time setting with the application of RTC (Real Time Clock) to detect human motion with motion-sensor detector (PIR). The primary aim of this research is to manage electrical energy more efficiently and to make a safety measure for the building itself. When PIR sensor detects any motion in safety-time-range that has been set before, it will send a short message to the central security system. It is supplied by hybrid system between solar cell and PLN electrical power. Though the use of the solar cell, an output voltage of 17-19 volt will be reduced through the buck converter to stabilize enough while filling 12-volt the accumulator. The output electrical voltage derived from accumulator will be converted from 12 Vdc to 12 Vac by an inverter; and then it will be increased to 220 Vac by step up voltage regulator to supply its lighting load. Otherwise, if the accumulator is not able to fulfill the supply, a microcontroller will force swith circuit to gain the lighting load another supply from PLN electrical power source. By implementing this management system, total energy within 10 hours (17.00-03.00 WIB) is 420 Wh; and it reduces the energy for 105 Wh with 25% efficiency.
Optimizing the Use of MPPT in PLTS for Hybrid Systems by Using STS as a Transfer Switch Azmil Anil Yamin Fajrus Sodiq; Renny Rakhmawati; Yahya Chusna Arif
JEEMECS (Journal of Electrical Engineering, Mechatronic and Computer Science) Vol 4, No 2 (2021): August 2021
Publisher : Merdeka Malang University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jeemecs.v4i2.6004

Abstract

To save energy nowadays is recommended to switch to renewable energy sources. In Indonesia, solar energy is abundant, so PLTS is made. The supply of PLTS is expected to reach maximum use. However, solar panels have many obstacles such as variations in temperature and sunlight intensity, MPPT systems are needed to find the maximum power point of the solar panels. Unfortunately, in Indonesia, the sunlight of short duration with the ideal irradiation time that can produce electricity from solar panels is 4 to 5 hours per day, so a PLN supply is still needed to support the continuity of the power supply. Because two sources are used, there is a problem where the load needs high continuity during power switching, so STS (Static Transfer Switch) is used for very fast power switching. Simulation results, when using EMR (Electromechanical Relay) the power transfer process takes 50ms or 5 cycles while STS takes 2ms or ¼ cycles. With very fast response to STS, sensitive equipment is kept safe from power quality disturbances such as voltage sag and voltage swell.
Fuzzy Logic Control Design on Buck Converter For Thermo Electric Air Cooler Power Supply Muhammad Wildan Alim; Novie Ayub Windarko; Renny Rakhmawati
JAREE (Journal on Advanced Research in Electrical Engineering) Vol 4, No 2 (2020): October
Publisher : Department of Electrical Engineering ITS and FORTEI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25796216.v4.i2.137

Abstract

The air conditioning system that is commonly used today is an Air Conditioner (AC). Unfortunately, this system is a big contributor to global warming. Often times, we find that air conditioners are only used to cool only a small part of a room for individual comfort. Therefore, a new breakthrough is needed from a cooling system that does not use chemicals so that it is environmentally friendly, namely using the Thermo Electric Cooler (TEC) cooling module which utilizes the cold side of the Thermo Electric Cooler (TEC). The size of the DC input voltage on the Thermo Electric Cooler (TEC) is adjusted using a buck converter with fuzzy control. When the buck converter closed loop condition with fuzzy control has a rise time value, the settling time and error percentage have a relatively better value than the open loop condition. When the buck converter set point 40V, the minimum water temperature in the air cooler can be reached 220C, when the buck converter set point is 48V the minimum water temperature in the water cooler can be reached 190C, and when the buck converter set point is 56V the minimum water temperature in the air cooler can be reached 180C. When the water cooler uses air cooler by Peltier, the input air temperature and output air temperature decrease in temperature around 10C. this is caused by the evaporative effect caused by water cooled by the peltier.Keywords: buck converter, cooler, fuzzy, thermo electric cooler. 
Evaluasi Performa Fuzzy Logic Controller untuk mengatur kecepatan Motor DC Penguatan Terpisah Muhammad Aditya Ardiansyah; Renny Rakhmawati; Hendik Eko Hadi Suharyanto; Era Purwanto
Energi & Kelistrikan Vol 12 No 2 (2020): Energi dan Kelistrikan: Jurnal Ilmiah
Publisher : Sekolah Tinggi Teknik PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/energi.v12i2.1000

Abstract

Beragamnya metode yang ditawarkan oleh fuzzy logic kontroller membuat sebagaian orang meneliti mengenai perbedaan metode inferensi yang digunakan oleh fuzzy logic controller. Sejauh ini terdapat tiga metode fuzzy logic kontroller yang telah dikembangkan yaitu Mamdani, Sugono dan Sukamoto. Pada jurnal ini penggunaan fuzzy logic kontroller akan dievaluasi dengan menggunakan motor dc penguat terpisah sebagai beban untuk melakukan pengaturan kecepatan motor dc. Pada paper ini tujuan utamanya adalah dapat mengendalikan kecepatan dari motor DC Penguatan Terpisah dengan mengatur tegangan jangkar dari motor tersebut. DC motor merupakan salah satu jenis motor memiliki banyak aplikasi dan memiliki kemudahan untuk mengatur kecepatan pada motor tersebut. Logika fuzzy yang digunakan pada studi ini adalah inferensi sugeno dimana dengan konfigurasi Multiple Input Single Output (MiSo). Dimana input berupa error dan perubahan error dan output berupa duty cycle dikarenakan yang dikendalikan oleh logika fuzzy adalah Boost Converter selaku controlled voltage source. Target pada jurnal ini adalah dari kecilnya nilai steady – state error dan minimnya osilasi sehingga mampu membuat sistem lebih stabil. Pada studi ini, Hasil pengujian dilakukan dengan menggunakan Simulink by Matlab dengan Hasil pengujian berupa error rata rata sebesar 5.36%.
State of charge estimation of ultracapacitor based on equivalent circuit model using adaptive neuro-fuzzy inference system Rizal Nurdiansyah; Novie Ayub Windarko; Renny Rakhmawati; Muhammad Abdul Haq
Journal of Mechatronics, Electrical Power and Vehicular Technology Vol 13, No 1 (2022)
Publisher : National Research and Innovation Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/j.mev.2022.v13.60-71

Abstract

Ultracapacitors have been attracting interest to apply as energy storage devices with advantages of fast charging capability, high power density, and long lifecycle. As a storage device, accurate monitoring is required to ensure and operate safely during the charge/discharge process. Therefore, high accuracy estimation of the state of charge (SOC) is needed to keep the Ultracapacitor working properly. This paper proposed SOC estimation using the Adaptive Neuro-Fuzzy Inference System (ANFIS). The ANFIS is tested by comparing it to true SOC based on an equivalent circuit model. To find the best method, the ANFIS is modified and tested with various membership functions of triangular, trapezoidal, and gaussian. The results show that triangular membership is the best method due to its high accuracy. An experimental test is also conducted to verify simulation results. As an overall result, the triangular membership shows the best estimation. Simulation results show SOC estimation mean absolute percentage error (MAPE) is 0.70 % for charging and 0.83 % for discharging. Furthermore, experimental results show that MAPE of SOC estimation is 0.76 % for random current. The results of simulations and experimental tests show that ANFIS with a triangular membership function has the most reliable ability with a minimum error value in estimating the state of charge on the Ultracapacitor even under conditions of indeterminate random current.
Fast Charging pada Baterai Li-Ion dengan Kontrol ANFIS Renny Rakhmawati; Zhafira Rana Khalisa Permana; Rachma Prilian Eviningsih; Suhariningsih
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 12 No 2: Mei 2023
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jnteti.v12i2.5143

Abstract

Most electrical energy used today comes from fossil fuels, which can deplete and contribute to air pollution. In Indonesia, the sun can be used as an alternative energy source and converted into electrical energy utilizing solar panel technology. The voltage generated by the solar panel is relatively high, so it needs to be lowered using a DC-DC converter type buck converter. This electrical energy can be stored using a battery which can be charged in a fast-charging mode to shorten the charging time. The most suitable battery type for fast charging is the lithium-ion (Li-ion) type for its capability to receive large current as big as 1C or equal to the battery capacity. Due to the temperature and solar irradiance effects, the output generated by the solar panel source is not constant. Moreover, to prevent overcharging, a constant current (CC) method with a constant current of 10 A and a constant voltage of 14.4 V was used which the PWM duty cycle driver was controlled using the adaptive neuro-fuzzy inference system (ANFIS) algorithm to obtain a faster response to reach the specified set point. ANFIS is a combination of two algorithms, i.e., artificial neural network (ANN) and fuzzy inference system (FIS). This research was conducted in simulation, the charging current results at the CC method of 10.01A were obtained and would move from the CC method to constant voltage (CV) when the state of charge (SoC) was 85% and the voltage reached 14.4 V. Then, the charging method would change to CV with a constant charging voltage of 14.4 V. When compared to the previous research using fuzzy control, the time required for ANFIS controls to reach set points was 3.2 ms, which is 2.3 ms faster than fuzzy controls, and ANFIS controls can reach set points with fewer errors.
Co-Authors Azmil Anil Yamin Fajrus Sodiq Era Purwanto Farid Dwi Murdianto Hendik Eko Hadi Suharyanto Muhammad Abdul Haq Muhammad Aditya Ardiansyah Muhammad Wildan Alim Novie Ayub Windarko Rachma Prilian Eviningsih Rizal Nurdiansyah Safira Nur Hanifah Suhariningsih Yahya Chusna Arif Zhafira Rana Khalisa Permana