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All Journal International Journal of Electrical and Computer Engineering ASEAN Journal of Systems Engineering MEDIA ELEKTRIKA Majalah Ilmiah Teknologi Elektro TEKNIK Transmisi: Jurnal Ilmiah Teknik Elektro Jurnal Pengembangan Energi Nuklir TELKOMNIKA (Telecommunication Computing Electronics and Control) Jurnal Ilmiah Teknik Elektro Komputer dan Informatika (JITEKI) PROSIDING CSGTEIS 2013 Jurnal Teknologi JURNAL NASIONAL TEKNIK ELEKTRO JTET (Jurnal Teknik Elektro Terapan) JTERA (Jurnal Teknologi Rekayasa) Communications in Science and Technology IJITEE (International Journal of Information Technology and Electrical Engineering) Jurnal Listrik, Instrumentasi, dan Elektronika Terapan Jurnal Nasional Teknik Elektro dan Teknologi Informasi Journal FORTEI-JEERI Majalah Ilmiah Teknologi Elektro

Sarjiya

Departemen Teknik Elektro Dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

Author-ID : 2374281

Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences

Published : 44 Documents Claim Missing Document

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Combined heat and power - optimal power flow based on thermodynamic model with associated petroleum and wet gas utilization constraints Priambudi Pujihatma; Sasongko Pramono Hadi; Sarjiya Sarjiya; Tri Agung Rohmat
International Journal of Electrical and Computer Engineering (IJECE) Vol 9, No 1: February 2019
Publisher : Institute of Advanced Engineering and Science

Oil fields produce associated petroleum and wet gas, which can be mixed with commercial natural gas as fuel. Associated petroleum and wet gas are a low cost, low quality fuel, whereas commercial natural gas is the opposite. Two parameters are affected by this mixture: the fuel cost and the power – steam output of gas turbine – heat recovery steam generators. This research develops a Unit Commitment and Optimal Power Flow model based on Mixed Integer Nonlinear Programming to optimize combined heat and power cost by considering the optimal mixture between associated petroleum - wet gas and commercial natural gas. A thermodynamic model is used to represent the performance of gas turbine – heat recovery steam generators when subjected to different fuel mixtures. The results show that the proposed model can optimize cost by determining the most efficient power – steam dispatch and optimal fuel mixture. Furthermore, the optimization model can analyse the trade-off between power system losses, steam demand and associated - wet gas utilization.

Maximum Power Point Tracking using Particle Swarm Optimization Algorithm for Hybrid Wind-Tidal Harvesting System on the South Coast of Java Fransisco Danang Wijaya; Kukuh Daud Pribadi; Sarjiya Sarjiya
International Journal of Electrical and Computer Engineering (IJECE) Vol 7, No 2: April 2017
Publisher : Institute of Advanced Engineering and Science

This paper proposes a hybrid wind-tidal harvesting system (HWTHS). To extract maximum power from the wind and tidal, HWTHS implements particle swarm optimization (PSO) algorithm in maximum power point tracking (MPPT) method. The proposed HWTHS had been tested on the range of possible input appropriate to the characteristics of the southern coast of Java. The presented result shows that by using PSO-based MPPT algorithm, maximum power point can be achieved. Thus the efficiency of HWTHS is 92 %, 94 % in wind section and 91 % in tidal section. By using PSO-based MPPT, HWTHS can respond well to changes in wind and tidal speed, whether it's a change from low speed to a higher speed or change from high speed to lower speed wherein time to reach new steady state is ± 0.1 s. At varied wind and tidal speed, PSO algorithm can maintain Cp of the system in the range of 0.47 - 0.48 so that power can be extracted to the maximum.

Optimizing Tri-Core Permanent-Magnet-Linear-Generator Direct-Drive Wave-Energy-Conversion System Design for Sea Wave Characteristics in South Coast Yogyakarta Fransisco Danang Wijaya; Sarjiya Sarjiya; Muhammad Rifa'i Putra Sugita
International Journal of Electrical and Computer Engineering (IJECE) Vol 7, No 2: April 2017
Publisher : Institute of Advanced Engineering and Science

According to statistical data, the south coast Yogyakarta has significant ocean wave height which can be used to generate electricity by using wave-energy-converter system. One of the simplest way to convert wave energy to electricity is using direct-drive wave-energy-conversion (WEC) system with permanent-magnet-linear-generator (PMLG). This method is simple because it doesn’t need to convert linear motion to rotational motion. However, PMLG has large electric power losses, has great weight in both of the stator and rotor, and expensive to make. In this paper, a tri-core PMLG was designed. The electric power losses in the winding, translator weight, and manufacturing cost were ideally minimized using multiobjective optimization combined with simulated annealing (SA) algorithm. Then, the design was verified using finite element analysis. The optimized design of this PMLG was simulated using sinusoidal ocean waves which usually occur in the south coast of Yogyakarta to analyze the performance of this linear generator. Simulation result has been shown that this generator can generate 911 watt peak output power at the rated condition and at the optimum load with 81.14% efficiency. This confirms that the optimized design of PMLG is suitable for direct-drive WEC with low power losses and manufacturing cost.

ANALISIS SIFAT HIDROFOBIK PERMUKAAN HDPE BERDASARKAN NILAI TOTAL HARMONIC DISTORTION Abdul Syakur; Hermawan Hermawan; Sarjiya Sarjiya; Hamzah Berahim
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 7, No 2: August 2009
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v7i2.583

Polymer material has been developed to replace the porcelain insulator material and glass. When it is used as outdoor insulator, environmental conditions have a significant influence to the value of surface discharge current, especially for the coastal area and industry. Salt, dust and chemicals contaminant are suspected as the causes of initial current of surface discharge and the insulator surface degradation which lead to a flashover. To analyze the performance of the insulator surface when the leakage current occurs, the Total Harmonic Distortion (THD) is needed to be determined. The value of THD leakage current indicates the hydrophobic characteristic of surface material. This paper analyzes the results of leakage current measurement in laboratory-scale based on IEC 587:1986 with Inclined-Plane Tracking (IPT) method to the High Density Polyethylene (HDPE) polymer material which is provided in smooth and rough surface. The testing voltage is 50 Hz AC. Data of leakage current magnitude values cover its maximum average as a function of time and the result of FFT to the wave form of the leakage current. As the result, the value of percentage THD decrease as the function of time. The smooth surface material has THD value 43.42% and the rough surface has 15.89%.

Power Oscillation Damping Control using Robust Coordinated Smart Devices Tumiran Tumiran; Cuk Supriyadi Ali Nandar; Sarjiya Sarjiya
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.v9i1.646

The lack of damping of the electromechanical oscillation modes usually causes severe problems of low frequency oscillations in interconnected power systems. In the extreme operating conditions, PSS may fail to damp power oscillation. This paper presents a robust coordinated design of power system stabilizer (PSS) and thyristor controlled series capacitor (TCSC) to damp power oscillation in an interconnected power system. The inverse additive perturbation is applied to represent unstructured uncertainties in the power system such as variations of system parameters, system generating and loading conditions. In addition, genetic algorithm is employed to search a robust tuning to the controller parameters of both PSS and TCSC simultaneously. Simulation studies have been done in a single machine infinite bus system to confirm that the performance and robustness of the proposed controller are superior to that of the conventional controller.

Optimasi Aliran Daya pada Sistem Kelistrikan Opsi Nuklir Berdasarkan Multi-Objective Function: Fuel Cost dan Flat Voltage Profile Rizki Firmansyah Setya Budi; Sarjiya Sarjiya; Sasongko Hadi Pramono
Jurnal Pengembangan Energi Nuklir Vol 18, No 2 (2016): Desember 2016
Publisher : Pusat Kajian Sistem Energi Nuklir, Badan Tenaga Nuklir Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jpen.2016.18.2.3127

Tujuan dari pengoperasian sistem tenaga listrik adalah untuk memasok daya dengan kualitas baik dan biaya pembangkitan seminimal mungkin. Kualitas yang baik membutuhkan biaya yang lebih besar, sehingga untuk mencapai tujuan tersebut diperlukan optimasi dengan fungsi obyektif yang bertujuan untuk memaksimalkan kualitas sekaligus meminimalkan biaya. Penelitian ini bertujuanuntuk mendapatkan kondisi aliran daya optimal atau optimal power flow (OPF) dari segi biaya pembangkitan maupun kualitas tenaga listrik di suatu sistem kelistrikan dengan opsi nuklir pada waktu beban puncak dengan menggabungkan fungsi obyektif fuel cost dan flat voltage profile. Fungsi obyektif fuel cost bertujuan untuk meminimalkan biaya pembangkitan sedangkan fungsi obyektif flat voltage profile bertujuan untuk memaksimalkan kualitas dengan meminimalkan perbedaan/variasi tegangan dalam sebuah sistem. Penelitian dilakukan melalui studi literatur, penentuan fungsi obyektif optimasi, penggabungan fungsi objektif, simulasi menggunakan contoh kasus dan analisis sensitivitas. Contoh kasus menggunakan sistem IEEE 9 Bus yang telah ditambahkan fungsi bahan bakar PLTN, PLTU, dan PLTG. Simulasi menggunakan program bantu ETAP 12.6.0. Analisis sensitivitas dilakukan dengan menggunakan nilai pembobotan dari 0-100% untuk tiap fungsi obyektif. Hasil simulasi menunjukkan bahwa OPF dicapai pada faktor pembebanan 60% untuk fuel cost dan 40% untuk flat voltage profile. Biaya pembangkitan padakondisi optimal tersebut sebesar 7266 US$/jam dengan selisih tegangan maksimum minimumnya sebesar 2,85%. Pada sistem ini PLTU membangkitkan daya sebesar 133,2 MW + 22,1 MVar dan PLTG sebesar 80,7 MW + 13,8 MVar. Sedangkan PLTN membangkitkan daya sebesar 89,9 MW + 12,9 Mvar dan akan ekonomis jika membangkitkan daya kurang dari 90 MW.

MICROCONTROLLER BASED HYDROGEN SULFIDE (H2S) MONITORING IN BIOGAS SYSTEM Diah Yuniarti; Sarjiya -; Ambar Pertiwiningrum
ASEAN Journal of Systems Engineering Vol 1, No 1 (2013): ASEAN Journal of Systems Engineering
Publisher : Master in Systems Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (730.835 KB)

Energy issue, particularly related to fossil fuel, is one the main issues today. Biogas is a new and renewable energy issued in National Research Agenda (ARN) 2010-2014 to overcome the energy crisis problem. A so called purification process is used to remove contaminants in biogas, including H2S in order to improve the standard requirement of biogas application. In this research, H2S concentration in biogas system is measured and monitored by H2S monitoring system.The hardware system comprises of piping and microcontroller AVR 8535 systems while the software system comprises of codes written in Delphi 7.0 and Code Vision AVR Eval. The result of the system is displayed on LCD or computer to enable the monitoring process by operator. The monitoring of H2S sensor responses will be carried out for recycled BFA size of 60+100 mesh and -200 mesh.Experiment has been conducted for sensor warming up time and response time for H2S and CH4 sensor, calibration process for H2S sensor and filter column. Based on sensor calibration experiment, transfer function of TGS825 sensor from calibration is y = 0.0203x + 27.153. The best adsorption model which represents BFA adsorption of biogas from tofu waste in the research is Thomas model.

Studi Optimal Power Flow Sistem Kelistrikan 500 kV Jawa Bali dengan Metode Algoritma Genetika Yassir -; Sarjiya -; T. Haryono -
MEDIA ELEKTRIKA Vol 6, No 1 (2013): MEDIA ELEKTRIKA
Publisher : PSTE UNIMUS

Salah satu solusi untuk mengurangi kenaikan harga listrik adalah dengan melakukan optimisasi biaya pada proses produksi energi listrik. Optimal Power Flow (OPF) adalah salah satu metode untuk meminimilisasi biaya bahan bakar pembangkit dengan tetap menjaga batasan keandalan sistem. Pada penelitian ini diaplikasikan metode Genetic Algorithm with tournament selection untuk menyelesaikan masalah OPF. Efektifitas metode diuji pada kasus sistem IEEE 30 bus. Hasil menunjukkan lebih baik dari metode differential evolution dan evolutionary programming. Simulasi pada sistem tenaga Jawa-Bali 500 kV dengan metode yang diusulkan dapat mengurangi biaya pembangkitan sebesar 12,19% dibanding dengan data operasi PLN.

PENGARUH PENAMBAHAN KARET SILIKON TERHADAP SUDUT KONTAK HIDROPOBIK DAN KARAKTERISTIK ARUS BOCOR PERMUKAAN PADA BAHAN RESIN EPOKSI Abdul Syakur; Ika Novia; Sarjiya Sarjiya; Tumiran Tumiran; Hamzah Berahim
Jurnal Teknologi Elektro Vol 9, No 2 (2010): (July - December) Majalah Ilmiah Teknologi Elektro
Publisher : Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1314.974 KB)

Currently, polymer materials such as epoxy resin have been used as an insulator in the distribution andtransmission line. Some advantages of using this epoxy resin material having the dielectric properties are better thanporcelain and glass insulators. On the other side, epoxy resins are also disadvantage the surface is hygroscopic. Forthe repair was done by adding the surface properties of silicone rubber materialThis paper describes the effect of adding silicone rubber against contact angle of hidrophobicity and surfaceleakage current characteristics of epoxy resin materials ( Di-Glycidyl Ether of Bisphenol A (DGEBA) andMethaphenylene-Diamine (MPDA). The study was conducted in the laboratory using the electrode method IEC587:1984 with NH4Cl contaminants. The voltage applied to the epoxy resin sample at 3.5 kV and 50 Hz frequencyThe experimental results showed that the addition of silicon rubber in epoxy resin makes the surface materialcontact angle increases. The higher percentage of silicone rubber, the greater the contact angle and the longer timerequired for the occurrence of surface discharge.

Electricity Demand and Supply Planning Analysis for Sumatera Interconnection System using Integrated Resources Planning Approach Suhono Suhono; Sarjiya Sarjiya; Sasongko Pramono Hadi
Jurnal Ilmiah Teknik Elektro Komputer dan Informatika Vol 5, No 1 (2019): June
Publisher : Universitas Ahmad Dahlan

The Sumatra interconnection system, which is the second-largest electricity system in Indonesia, is often experiencing rolling blackouts. That caused by a lack of supply from the power generating system of Sumatra. The Government has planned to develop new power plants through the fast track program (FTP). Until 2015, either power outages and supply shortages are still common. Therefore, an analysis of long-term electricity planning needed to support energy security in Sumatra. The Sumatra electricity system was modelled using integrated resource planning as a framework and the long-range energy alternative planning (LEAP) software as a tool to build and simulate the model. Three groups of scenarios will be compared are the fast track program (FTP) scenario, the biofuel mandatory (BM) scenario and optimization (OPT) scenario. The results show that the implementation of DSM programs through energy conservation scenario would be able to reduce the electricity demand in the future. On the other side, the alternative scenario shows that the electricity deficit could be resolved in 2022, while the optimization scenario shows that energy diversity would resolve the electricity crisis in the Sumatra interconnection system.

Co-Authors Abdul Syakur Adlan Bagus Pradana Alan Abdu Robbi Afifi Alfi Bahar Ambar Pertiwiningrum Ambariyanto Ambariyanto Amrisal Kamal Fajri Angga Cahya Putra Avrin Nur Widiastuti Christina Purwaningsih Cuk Supriyadi Ali Nandar Daniar Rizki Wijayanti Diah Yuniarti Dian Budhi Santoso Eko Tri Prastyo Eko Yudo Pramono Fajar Prasetia Fatana, Ahmad Fransisco Danang Wijaya Galih Yudhaprawira Gessa Firman Febrian Hamzah Berahim Hamzah Berahim Hamzah Berahim Haneef Nouval Alannibras Humaidi Hatta Imaduddien Wiennetou Hazel Ariantara Hermawan, Hermawan Husni Rois Ali I Ketut Suada Ika Novia Ika Novia A Indra Triwibowo Izzuddin Fathin Azhar Kukuh Arung Pinanditho Kukuh Daud Pribadi Kurniawan, Jaya Lesnanto Multa Putranto Lukas Joko Dwiatmanto, Lukas Joko Mokhammad Isnaeni Bambang Setyonegoro Muhammad Bhayu Bramantyo Muhammad Rifa'i Putra Sugita Muhammad Yasirroni Musthafa Abdur Rosyied Pinanditho, Kukuh Arung Prabowo, Muhaimin Muchti Prasetia, Fajar Prasetyo, Pandhu Ardi Prastyo, Eko Tri Priambudi Pujihatma Qiangqiang Xie Rian Fatah M. Rizki Firmansyah Setya Budi Rizki Firmansyah Setya Budi Rochmadi Rochmadi Sabhan Kanata Sasongko Pramono Hadi Suhono Suhono T. Haryono T. Haryono - Tri Agung Rohmat Tumiran Wiennetou, Hatta Imaduddien Wijayanti, Daniar Rizki Winarko AP Winasis Winasis Wiwik Handajadi, Wiwik Yassir - Yassir Yassir Yudhaprawira, Galih Yusuf Susilo Wijoyo Zainal Abidin

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