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All Journal International Journal of Electrical and Computer Engineering International Journal of Power Electronics and Drive Systems (IJPEDS) TELKOMNIKA (Telecommunication Computing Electronics and Control) Jurnal Pengabdian Kepada Masyarakat Sakai Sambayan Jurnal Informatika dan Teknik Elektro Terapan Jurnal Teori dan Aplikasi Fisika Journal of Multidisciplinary Applied Natural Science Prosiding Seminar Nasional Hasil Penelitian Sains, Teknik dan Aplikasi Industri Fakultas Teknik Universitas Lampung Electrician : Jurnal Rekayasa dan Teknologi Elektro Analit: Analytical and Environmental Chemistry

Ahmad Saudi Samosir

Universitas Lampung

Author-ID : 369728

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Other

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Peningkatan Karakteristik Listrik Sel Elektrokimia Cu(Ag)-Zn dengan Penggunaan AnodaTumbal Mgpada Accumulator Berbahan Air Laut Ahmad Pauzi, Gurum; Nisa, Mia Abi; Samosir, Ahmad Saudi; Sulistiyanti, Sri Ratna; Simanjuntak, Wasinton
Jurnal Teori dan Aplikasi Fisika Vol 8, No 1 (2020): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v8i1.2448

Penelitian ini dilakukan untuk mempelajari penggunaan magnesium (Mg) sebagai anoda tumbal untuk melindungi Zn yang digunakan sebagai anoda dalam sel elektrokimia untuk menghasilkan energi listrik dari air laut. Sebagai katoda digunakan Cu yang dilapisi dengan logam Ag untuk melindunginya dari korosi katodik. Sel elektrikimia dirangkai terdiri dari 20 sel yang disusun secara seri, dan masing-masing sel diisi air sebanyak 300 mL. Sel elektrokimia dihubungkan dengan beban LED 3 watt 12 volt selama 72 jam dan pengambilan data karakteristik listrik meliputi tegangan, arus, dan intensitas cahaya, setiap 1 jam. Dari data tegangan dan arus, dihitung besarnya hambatan dalam. Hasil penelitian menunjukkan bahwa penggunaan Mg sebagai anoda tumbal menghasilkan data karaktersitik listrik yang lebih besar dibanding dengan sel elektrokimia tanpa penggunaan anoda tumbal.

Modeling and Simulation of Fuzzy Logic based Maximum Power Point Tracking (MPPT) for PV Application Ahmad Saudi Samosir; Herri Gusmedi; Sri Purwiyanti; Endah Komalasari
International Journal of Electrical and Computer Engineering (IJECE) Vol 8, No 3: June 2018
Publisher : Institute of Advanced Engineering and Science

This paper presents modeling and simulation of maximum power point tracking (MPPT) used in solar PV power systems. The Fuzzy logic algorithm is used to minimize the error between the actual power and the estimated maximum power. The simulation model was developed and tested to investigate the effectiveness of the proposed MPPT controller. MATLAB Simulink was employed for simulation studies. The proposed system was simulated and tested successfully on a photovoltaic solar panel model. The Fuzzy logic algorithm succesfully tracking the MPPs and performs precise control under rapidly changing atmospheric conditions. Simulation results indicate the feasibility and improved functionality of the system.

Simulation and Implementation of Interleaved Boost DC-DC Converter for Fuel Cell Application Ahmad Saudi Samosir; NFN Taufiq; Abdul Halim Mohd Yatim
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 1, No 2: December 2011
Publisher : Institute of Advanced Engineering and Science

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

This paper deals with a boost dc-dc converter for fuel cell application. In fuel cell electric vehicles application, a high power boost dc-dc converter is adopted to adjust the output voltage, current and power of fuel cell engine to meet the vehicle requirements. One of challenge in designing a boost converter for high power application is how to handle the high current at the input side. In this paper an interleaved boost dc-dc converter is proposed for current sharing on high power application. Moreover, this converter also reduces the fuel ripple current. Performance of the interleaved boost converter is tested through simulation and experimental results.Keywords: component; Interleaved Boost Converter; Fuel Cell Electric Vehicle; high power application.DOI: http://dx.doi.org/10.11591/ijpeds.v1i2.126

DEVELOPMENT OF A CURRENT CONTROL ULTRACAPACITOR CHARGER BASED ON DIGITAL SIGNAL PROCESSING Ahmad Saudi Samosir
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 7, No 3: December 2009
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v7i3.587

Ultracapacitor usually use as a short-term duration electrical energy storage because it has several advantages, like high power density (5kW/kg), long lifecycle and very good charge/discharge efficiency. Unlike batteries, ultracapacitors may be charged and discharged at similar rates. This is very useful in energy recovery systems such as dynamic braking of transport systems. Here are a few characteristics of ultracapacitors that should be kept in mind when integrating/designing a charging system for the intended application. An ultracapacitor with zero charge looks like a short circuit to the charging source. Most of low cost power supplies fold back the output current in response to a perceived short circuit, making them unsuitable for charging of ultracapacitors. Ultracapacitors have a low series inductance allowing easy stabilizing with switch mode chargers. The RC time constant of passive charging networks is usually too long. Therefore, linear regulators are inefficient components for ultracapacitor charging. In this paper, the development of a current control ultracapacitor charger based on Digital Signal Processing (DSP) is presented.

STUDI PENGGUNAAN PENYEARAH 18 PULSA DENGAN TRANSFORMATOR 3 FASA KE 9 FASA HUBUNGAN SEGIENAM Ahmad Saudi Samosir
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 6, No 1: April 2008
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v6i1.547

The 18-pulse converter, using Y or D-connected differential autotransformer, is very interesting since it allows natural high power factor correction. The lowest input current harmonic components are the 17th and 19th. The Transformer is designed to feed three six-pulse bridge rectifiers displaced in phase by 200. This paper present a high power factor three-phase rectifier bases on 3-phase to 9-phase transformer and 18-pulse rectifier. The 9-phase polygon-connected transformer followed by 18-pulse diode rectifiers ensures the fundamental concept of natural power factor correction. Simulation results to verify the proposed concept are shown in this paper.

Dynamic Evolution Control for Fuel Cell DC-DC Converter Ahmad Saudi Samosir; Tole Sutikno; Abdul Halim Mohd Yatim
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 9, No 1: April 2011
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v9i1.686

Fuel cells are new alternative energy resource that has a great promise for distributed generation and electric vehicle application. However, fuel cells have a slow response due to their slow internal electromechanical and thermodynamic response. To optimize the fuel cell system performance, a fuel cell DC-DC converter with an appropriate controller which can regulate the power flow and automatically adjust the converter output voltage is needed. This paper proposes a new control technique for fuel cell DC-DC power converter. Design of the proposed control method for fuel cell DC-DC power converter is provided. A new approach for converter controllers synthesis based on dynamic evolution control theory is presented. In this paper, synthesis example of boost DC-DC converter is discussed. Performance of the proposed dynamic evolution control under step load variation condition is simulated under Matlab-Simulink environment. Simulation results show that the proposed techniques are capable for controlling fuel cell DC-DC converter.

Prototype Generator Dc Dengan Penggerak Tenaga Angin Wan Novri Saputra; Dikpride Despa; Noer Soedjarwanto; Ahmad Saudi Samosir
Jurnal Informatika dan Teknik Elektro Terapan (JITET) Vol 4, No 1 (2016)
Publisher : Universitas Lampung

Angin merupakan salah satu sumber energi listrik. Untuk menghasilkan energi listrik dari angin dapat menggunakan alternator atau generator untuk mengonversi energi gerak menjadi energi listrik. Oleh karena itu, perlu dirancang sebuah prototype yang dapat digunakan sebagai referensi pemanfaatan sumber energi angin untuk menghasilkan energi listrik. Rancangan prototype ini menggunakan baling-baling yang terkopel dengan generator dan sistem utama yaitu sensor rotary encoder, sensor arus, dan sensor tegangan. Untuk pemrosesannya menggunakan modul Arduino Uno dan penyimpanan data menggunakan modul data logger. Sedangkan untuk pengambilan data menggunakan sepeda motor dengan memanfaatkan tekanan angin pada saat sepeda motor berjalan.Hasil pengujian didapatkan persamaan hubungan antara perbandingan tegangan uji dengan tegangan perhitungan terhadap kecepatan putaran rotor generator, yaitu y uji =0,007x+0,004 dan yperhitungan = 0,011x-2,844 dengan persentase rata-rata eror adalah 15,04%.Untuk persamaan hubungan antara perbandingan arus uji dengan arus perhitungan terhadap kecepatan putaran rotor pada generator, yaitu yuji =0,000x+0,0415 dan yperhitungan = 0,002x-0,498 dengan persentase rata-rata eror adalah 31,09%.Sedangkan untuk hubungan kecepatan putaran rotor generator terhadap kecepatan sepeda motor (untuk kecepatan sepeda motor = 30 km/jam)didapatkan persamaan ???? = 25,40???? - 342,9. Kata Kunci: Angin, Prototype Generator dc, Rotary Encoder, Arduino Uno, Data Logger.

Simple formula for designing the PID controller of a DC-DC buck converter Ahmad Saudi Samosir; Tole Sutikno; Luthfiyyatun Mardiyah
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 14, No 1: March 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v14.i1.pp327-336

This paper proposes a simple way to design a proportional integral derivative proportional integral derivative (PID) controller for a DC-DC buck converter. This work concerns getting the formula to calculate Kp, Ki, and Kd parameters from a PID controller easily. The main advantage of this formula is that the tuning process of the KP, KI and KD parameters of the PID controller will be simplified just by entering the R, L, and C component values of the buck converter into the formula. The synthesis process of the formula is explained step by step. State space analysis is used to model the equations and transfer functions of the buck converter. The transfer function of the PID controller and buck converter was analyzed to obtain the Buck Converter system's closed loop transfer function. The formula for calculating the parameters KP, KI and KD of the PID controller is derived from the closed loop transfer function of the buck converter system. Numerical simulations are provided to confirm the effectiveness of the proposed PID controller. The performance of the buck converter controlled by the proposed PID controller was tested under various load conditions.

Performance numerical evaluation of modified single-ended primary-inductor converter for photovoltaic systems Tole Sutikno; Rizky Ajie Aprilianto; Nik Rumzi Nik Idris; Ahmad Saudi Samosir
International Journal of Electrical and Computer Engineering (IJECE) Vol 13, No 4: August 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v13i4.pp3720-3732

Single-ended primary-inductor converter (SEPIC) was considered a good alternative to a DC-DC converter for photovoltaic (PV) systems. The SEPIC converter can operate with an input voltage greater or less than the regulated output voltage, or as a step-up or step-down. As a step-up converter, SEPIC boosts PV voltage to specific levels. However, gain limitation and voltage stress continue to reduce the efficiency of conventional SEPIC converters. Because of this, researchers created a modified SEPIC converter to improve performance. In this paper, six modified SEPIC converters were compared and evaluated. To compare fairly, all modified SEPIC converters are non-isolated and use a single switch. Power simulator (PSIM) software was used to simulate each converter with a BISOL BMO-250 PV module and maximum power point tracking (MPPT) P&O controller. The converter with the highest static voltage gain and lowest duty cycle has been identified. It results in up to ten times voltage increment with a 0.8-duty ratio. All topologies have the same voltage stress, with maximum and minimum values of 30.1 and 29.5 V, respectively. On the other hand, each topology produces different average efficiencies, with the highest and lowest efficiency at 99.5% and 97.2%, respectively.

ANALISIS PEMANFAATAN JEMBATAN GARAM KCl DAN NaCl TERHADAP LAJU KOROSI ELEKTRODA Zn PADA SEL VOLTA MENGGUNAKAN AIR LAUT SEBAGAI ELEKTROLIT Gurum Ahmad Pauzi; Arie Anjarwati; Ahmad Saudi Samosir; Sri Ratna Sulistiyanti; Wasinton Simanjuntak
Analit: Analytical and Environmental Chemistry Vol 4, No 2 (2019): Analit: Analytical and Environmental Chemistry
Publisher : Universitas Lampung Jl. Prof. Dr. Sumatri Brojonegoro No.1 Bandar Lampung

Penelitian ini dilakukan untuk menganalisis pengaruh jembatan garam terhadap laju korosi elektroda Zn pada Sel volta. Pasang elektroda Cu (Ag)-Zn digunakan untuk menghasilkan tegangan dan arus dalam sel dengan elektrolit air laut. Variasi jembatan garam menggunakan agar yang dilarutkan dengan 0,1 mol NaCl, 0,1 mol KCl, 1 mol NaCl, dan 1 mol KCl. Sel volta terdiri dari 20 sel yang tersusun secara seri, masing-masing sel diisi ± 300 ml air laut. Sel volta terhubung ke beban LED 3 watt 12 volt selama satu hari, dan 30 hari. Hasil penelitian menunjukkan bahwa jembatan garam NaCl 1 mol menghasilkan karakteristik listrik yang lebih tinggi dan laju korosi yang lebih tinggi pada elektroda Zn.http://dx.doi.org/10.23960/aec.v4.i2.2019.p50-58

Co-Authors -, Ubaidah Abdul Halim Mohd Yatim Abdul Halim Mohd Yatim Abdul Haris Ageng Sadnowo Repelianto Ahmad Pauzi, Gurum Arie Anjarwati Dikpride Despa Endah Komalasari Gurum Ahmad Pauzi Herri Gusmedi Huda, Alfin Fitrohul Luthfiyyatun Mardiyah Mardiyah, Luthfiyyatun Melzi Ambar Mazta Muhammad, Meizano Ardhi NFN Taufiq Nik Rumzi Nik Idris Nisa, Mia Abi Noer Soedjarwanto Pauzi, Gurum Ahmad Putra, Rizki Pratama Rizky Ajie Aprilianto Sedjahtera, A Sony Ferbangkara Sri Purwiyanti Sri Ratna Sulistiyanti Sri Wahyu Suciyati Sumadi - Surtono, Arif Syafriadi Syafriadi Syaiful Alam Tole Sutikno ubaidah ubaidah Wan Novri Saputra Wasinton Simanjuntak Wasinton Simanjuntak

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