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6th ITB International Geothermal Workshop, IIGW 2017

作者： Purwaningsih, Fitri Oktaviani Husnie, Ruly Afuar, Waldy Abdurrahman, Gugun Study Program of Geothermal Engineering Faculty of Mining and Petroleum Bandung Institute of Technology Bandung Indonesia PT Geo Dipa Energy Jakarta Indonesia

After commissioning of a power plant, geothermal reservoir will encounter pressure decline, which will affect wells productivity. Therefore, further drilling is carried out to enhance steam production. Make-up wells are production wells drilled inside an already confirmed reservoir to maintain steam production in a certain level. Based on Sanyal (2004), geothermal power cost consists of three components, those are capital cost, O&M cost and make-up drilling cost. The make-up drilling cost component is a major part of power cost which will give big influence in a whole economical value of the project. The objective of this paper it to analyse the make-up wells drilling cost component in financial model of a geothermal power project. The research will calculate make-up wells requirements, drilling costs as a function of time and how they influence the financial model and affect the power cost. The best scenario in determining make-up wells strategy in relation with the project financial model would be the result of this research. © Published under licence by IOP Publishing Ltd.

关键词： Costs

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Prediction of electricity load growth of tangerang city using SIMPLE-E 2

Prediction of electricity load growth of tangerang city usin...

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2nd IEEE International Conference on Innovative Research and Development, ICIRD 2019

作者： Putra, Andi Aulia Nayusrizal, N. Untari, Indira Wibisono, Gunawan Hudaya, Chairul Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Energy System Engineering Master Study Program Faculty of Engineering Universitas Indonesia Depok16424 Indonesia Trunojoyo Block M-I No.135 Jakarta12160 Indonesia

ISBN: (纸本)9781728128252

The electricity load growth should be planned appropriately to meet energy demand in a certain area. Electricity consumption growth is generally proportional with the economic and population growth. Using historical data on Gross Domestic Regional Product (GDRP) and population growth, the electricity load growth in the near future can be statistically predicted. The relationship between economic and population growth trend and total customers as well as the demands of contract electricity energy growth trend could be connected by the linear regression method to predict electricity energy consumptions. Through a Simple Econometric Simulation System (SIMPLE-E) program run in Microsoft Excel application, linear regression trend can be calculated. The purpose of study is to predict the growth of electricity consumption in Tangerang City-Indonesia, for the next ten consecutive years (2019-2028). Customer data that will be analyzed consist of five segments, which are Residential (R), Commercial (B), Industry (I), Public (P), and Social (S). Those can be combined with Gross Regional Domestic Product and human population using Multiples Linear Regression in SIMPLE-E. The correlation between dependent variables (total customers and contract of power) and independent variables (population and GRDP) will be computed in SIMPLE-E through rate value of correlation R, Adjusted R, and Durbin Watson test. The Actual trend data of total customer, contract power from 2012 to 2018, is compared to model equation from linear regression. The calculation of error use Root Mean Square Percentage Error and Mean Percentage Error, shows that the total error is less than 5%, meaning the simulation is scientifically accepted. This study shows that the average growth of electricity consumption in Tangerang city from 2019 to 2028 is 5.63%. It means that every 1% growth of economy in Tangerang will increase electricity load consumption for 0.94%. © 2019 IEEE.

关键词： Errors

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Thermomagnetic anomalies in quantum magnon transport caused by tunable junction geometries in cold atomic systems

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Physical Review A 2025年第3期111卷 033312-033312页

作者： Yuta Sekino Yuya Ominato Hiroyuki Tajima Shun Uchino Mamoru Matsuo Interdisciplinary Theoretical and Mathematical Sciences Program RIKEN Wako Saitama 351-0198 Japan Nonequilibrium Quantum Statistical Mechanics RIKEN Hakubi Research Team RIKEN Cluster for Pioneering Research Wako Saitama 351-0198 Japan Waseda Institute for Advanced Study Waseda University Shinjuku-ku Tokyo 169-0051 Japan Department of Physics School of Science The University of Tokyo Tokyo 113-0033 Japan Faculty of Science and Engineering Waseda University Tokyo 169-8555 Japan Kavli Institute for Theoretical Sciences University of Chinese Academy of Sciences Beijing 100190 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China Advanced Science Research Center Japan Atomic Energy Agency Tokai 319-1195 Japan RIKEN Center for Emergent Matter Science Wako Saitama 351-0198 Japan

We study magnon-driven spin and heat transport in a magnetic linear junction (MLJ) formed by two ferromagnets in optical lattices linked via linearly aligned bonds. Using the Schwinger-Keldysh formalism, we uncover that under weak effective Zeeman fields, where Bose-Einstein statistics of magnons dominate, magnonic criticality dramatically enhances spin and thermal conductances. These singular transport properties depend on the junction geometry, and the transport properties qualitatively differ between the linear junction in this paper and the point contact in our previous work. The quantum-enhanced conductances result in the breakdown of the magnonic Wiedemann-Franz (WF) law. In the classical regime at temperatures much lower than magnon energy gaps, we find that a magnonic Lorenz number becomes independent of temperature yet dependent on junction geometry, sharply contrasting with the universal WF law for Fermi liquids. We also find that the interface geometry of the MLJ decouples spin and heat relaxations between ferromagnets with decay times insensitive to temperature and effective Zeeman fields. These dynamics reveal junction-geometry-sensitive magnon transport distinct from Fermi liquids, paving the way for new avenues in thermomagnetic research leveraging the tunability of cold atomic systems.

关键词： Fermi liquids

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TECTONIC GEOMORPHOLOGY ANALYSIS OF THE EAST LEMBANG FAULT SYSTEM IN THE UJUNG BERUNG AND JATINANGOR AREA, WEST JAVA, INDONESIA 44

TECTONIC GEOMORPHOLOGY ANALYSIS OF THE EAST LEMBANG FAULT SY...

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44th Asian Conference on Remote Sensing, ACRS 2023

作者： Sulastri, Murni Sadisun, Imam A. Sulaksana, Nana Sukrisyanti Rendra, Pradnya Paramarta Raditya Wahyuni, Sri Geological Technology Study Program Mining Energy Polytechnic Bandung Bandung Indonesia Indonesia Indonesia Faculty of Geological Engineering Universitas Padjadjaran Bandung Indonesia Bandung Indonesia

ISBN: (纸本)9781713893646

Lembang fault is an active fault that may trigger earthquakes and landslides in the North Bandung area. The movement of the fault is on the mainland, theLembang fult is still being debated even though an earthquake has been recorded which may have originated from this fault. The epicenter in the Cihideung area, in addition to tectonic influences, the activity of the Lembang fault is also thought to be influenced by volcanism which can affect the mechanism of fault movement. Tectonic processes play an essential role in the formation of the morphology of an area. The Lembang fault is a normal fault that was formed as a result of tectonic activity in the Neogene sge, located in the northern part of Bandung, stretching for 30 km in a west-east direction, the existence of this fault has shaped the morphology of the Lembang plains to the north and forms a hilly path trending west-east to the north. South. Tectonic geomorphology is the main factor that controls the development of landforms in active tectonic areas and have a significant influence on the natural features of mountains and watersheds which are located east of the Lembang fault, Cikapundung, and Cikeruh. Trending northwest-southeast geomorphic indication analysis is used to study tectonic activity in the study area in the form of basin shape (Bs), watersheds gradient index (SL), drainage basin asymmetry (Af), mountain face sinuosity (SMF) and valley floor width to valley height ratio (Vf). These geomorphic indication variables are combined to produce degrees of relative tectonic activity in the research area which can be divided into four classes;class 1 has a very high relative tectonic activity index, class 2 has a relatively high tectonic activity index, class 3 has a relatively moderate tectonic activity index, and class 4 has a relatively low tectonic activity index, field observation data in the form of the landform and geology of the research area support these results. © 2023 ACRS. All Rights Reserved.

关键词： Geomorphic Indication Lembang Fault Tectonic Geomorphology

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Mini-micro hydropower plants progress in Indonesia: The effective and suitable projects for isolated and remote communities

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Test engineering and Management 2020年 83卷 1509-1514页

作者： Yunus, A. M. Shiddiq Apollo Mulyadi, Musrady Arifuddin, M. Pakka, Hariani M. Energy Conversion Study Program Mechanical Engineering Dept Politeknik Negeri Ujung Pandang Jl. Perintis Kemerdekaan KM. 10 Makassar90245 Indonesia Ministry of Energy and Mineral Resources of Indonesia Jl. Medan Merdeka Selatan No. 18 Jakarta Pusat10110 Indonesia Electrical Engineering Department Moslem University of Indonesia Jl. Urip Sumihardjo Makassar Indonesia

In 2017 Indonesia has reached about 91.16% of national electrification ratio. The most challenging part of increasing the electrification ratio is the ineffective cost and long term revenue of installing long distribution and transmission lines to the isolated and remote areas. To achieve the 100% electrification ratio in 2020, the Indonesian government has constructed more micro hydropower plants (MHPP) scale to supply power to isolated and remote areas. The total hydropower plant that has been installed all around Indonesia since 2016 is about 11% of the total available potency. The projects were economically effective as they normally run with the collaboration among, national government, local authority and local communities. The mini-micro hydropower projects that were running from 2011 to 2015 have been conducted in two main scheme, the private sector or so-called independent power producers (IPPs) and through government funding. The MHPP projects implementation of course was facing in between benefits and shortcomings. Some of the benefits of MHPP are low cost project, environment benign and long live operation. However, the drawbacks of MHPP might include specific site requirement, social conflict, non-skilled operator that might harm himself, and operation is depending on the local climate. The win-win solution should be come across for MHPP projects to accommodate between the benefits and the short-comings. © 2020 Mattingley Publishing. All rights reserved.

关键词： Hydroelectric power plants

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Application of STATCOM to improve the high-voltage-ride-through capability of wind turbine generator

Application of STATCOM to improve the high-voltage-ride-thro...

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IEEE Power and energy Society'sInnovative Smart Grid Technologies Asia 2011 Conference,ISGT Asia 2011

作者： Alharbi, Y.M. Shiddiq Yunus, A.M. Abu-Siada, A. King Abdullah Scholarship Program Australia Departement of Mechanical Engineering Energy Conversion Study Program State Polytechnic of Ujungpandang Perintis Kemerdekaan KM. 10 Makassar 90215 Indonesia Department of Electrical and Computer Engineering Curtin University Perth WA 6845 Australia

ISBN: (纸本)9781457708756

Variable speed wind turbine with full scale converter or so-called type-D wind turbine generator worldwide installation has been significantly increased in the last few years. Voltage Swell in the grid side may cause the wind turbine to be disconnected from the grid. In this paper, STATCOM is applied to improve the high voltage ride through capability of type-D wind turbine during voltage swell in the grid side. Simulation is carried out using MATLAB/Simulink software. Results show that STATCOM can significantly improve the high voltage ride through (HVRT) capability of type-D wind turbine and prevents it from being disconnected from the grid during certain level of voltage swell in the grid side. © 2011 IEEE.

关键词： Static synchronous compensators

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Application of SMES unit to improve the high-voltage-ride-through capability of DFIG-grid connected during voltage swell

Application of SMES unit to improve the high-voltage-ride-th...

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IEEE Power and energy Society'sInnovative Smart Grid Technologies Asia 2011 Conference,ISGT Asia 2011

作者： Shiddiq Yunus, A.M. Abu-Siada, A. Masoum, M.A.S. Department of Mechanical Engineering Energy Conversion Study Program State Polytechnic of Ujung Pandang Perintis Kemerdekaan KM. 10 Makassar 90245 Indonesia Department of Electrical and Computer Engineering Curtin University Perth WA Australia

ISBN: (纸本)9781457708756

The amount of wind turbine connected to the power grid has significantly increased during the last decade. This has resulted in essential need to establish grid codes. Previously, wind turbine generators (WTGs) were allowed to be disconnected from the network during any disturbance at the grid side to avoid WTGs from being damaged. However, lately, the transmission system operators (TSOs) require WTGs to be stayed connected to provide support to the grid during fault. This new requirement has been regulated in the new grid codes. In this paper, the super conducting magnetic energy storage (SMES) unit is used to enhance the high voltage ride through (HVRT) capability of DFIG based WTG during voltage swell events at the grid side. Two new grid codes are used to verify the ability of the SMES unit to avoid the WTG from being disconnected from the grid. © 2011 IEEE.

关键词： Wind Turbine Generators

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Improvement of LVRT capability of variable speed wind turbine generators using SMES unit

Improvement of LVRT capability of variable speed wind turbin...

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IEEE Power and energy Society'sInnovative Smart Grid Technologies Asia 2011 Conference,ISGT Asia 2011

作者： Shiddiq Yunus, A.M. Abu-Siada, A. Masoum, Mohammad A. S. Department of Mechanical Engineering Energy Conversion Study Program State Polytechnic of Ujung Pandang Perintis Kemerdekaan KM. 10 Makassar 90245 Indonesia Department of Electrical and Computer Engineering Curtin University Perth WA Australia

ISBN: (纸本)9781457708756

The ability of variable speed wind turbines technology to optimally tracking the power from wind energy has become the main reason of their popularity compared with the fixed speed wind turbines. In the earlier stage of connecting wind turbines (WTs) to the existing electricity grids, WTs were allowed to be disconnected from the grid in case of grid faults which might lead to the damage of the turbines. However, recently, the transmission system operators (TSOs) require to maintaining the connection of WTs with the grid to support the grid during fault and to assure the continuity of power supply. This requirement has been compiled in new grid codes in several countries. In this paper, super conducting magnetic energy storage (SMES) unit is used with two different types of variable speed wind turbine generators to comply with Spain grid codes. Results show that the low-voltage-ride-through (LVRT) of Type-3 and Type-4 wind turbine generators are significantly improved when SMES unit is connected to the system. © 2011 IEEE.

关键词： Wind power

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Effect of STATCOM on the low-voltage-ride-through capability of type-D wind turbine generator

Effect of STATCOM on the low-voltage-ride-through capability...

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IEEE Power and energy Society'sInnovative Smart Grid Technologies Asia 2011 Conference,ISGT Asia 2011

作者： Shiddiq Yunus, A.M. Masoum, Mohammad A. S. Abu-Siada, A. Departement of Mechanical Engineering Energy Conversion Study Program State Polytechnic of Ujungpandang Perintis Kemerdekaan KM. 10 Makassar 90215 Indonesia Department of Electrical and Computer Engineering Curtin University Perth WA 6845 Australia

ISBN: (纸本)9781457708756

Variable speed wind turbine with full scale converter or so-called Type-D wind turbine generator worldwide installation has been significantly increased in the last few years. Voltage sag in the grid side may cause the wind turbine to be disconnected from the grid. In this paper, effect of STATCOM on the low voltage ride through capability of Type-D wind turbine during voltage sag in the grid side is studied. Simulation is carried out using MATLAB/Simulink software. Results show that STATCOM can significantly improve the voltage profile at the Point of Common Coupling (PCC) and improve the capability of Type-D wind turbine and prevents it from being disconnected from the grid during certain level of voltage sag in the grid side. © 2011 IEEE.

关键词： Static synchronous compensators

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Characteristics of primary tin mineralization in the Central and West Bangka Island 3

Characteristics of primary tin mineralization in the Central...

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3rd Life and Environmental Sciences Academics Forum, LEAF 2019

作者： Aditya, R. Setiawan, I. Nugraheni, R.D. Sihombing, F.M.H. Indra, T.L. Universitas Indonesia Depok16424 Indonesia Bandung40135 Indonesia Geology Engineering Study Program Faculty of Earth and Energy Technology Universitas Trisakti Jakarta Barat11440 Indonesia

Bangka Island is an important tin producer in Indonesia, mostly from the secondary tin deposits. However, the secondary tin deposit is depleting, causing further exploration shifted to the primary tin mineral. The purpose of this study is to make a mineralization model of primary tin deposit in Bangka Island. Methods that implemented in this study are petrographic analysis, mineragraphic analysis, XRD (X-Ray Diffraction), and XRF (X-Ray Fluorescence) analysis. The studied rock samples that consisted of granite, meta-sandstone, and sandstone. Some of the rocks are altered rocks with varying intensity. Petrographic and mineragraphic analysis show the presence of minerals that indicate the primary tin deposits, such as cassiterite, tourmaline, topaz, sericite, pyrite, and sphalerite. XRF analysis shows data about the value of Sn elements so that they can be classified into two classes, very high grade (> 800 ppm), and low grade (100-200 ppm). XRD analysis is necessary to do to determine the type and intensity of alterations that occur in the study area. The results of each analysis will provide supporting information regarding the primary tin mineralization process in Bangka Island. © Published under licence by IOP Publishing Ltd.

关键词： Pyrites

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