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Impacts of Grid Frequency Variation on Dynamic Performance of DFIG Based Wind Turbine

IOP Conference Series: Materials Science and engineering 2019年第1期619卷

作者： A. M. Shiddiq Yunus Energy Conversion Study Program Mechanical Engineering Department Politeknik Negeri Ujung Pandang Indonesia

Wind energy is one of popular sources of renewable energy that massively used to generate electric power nowadays. Among wind generator technologies, Doubly Fed Induction Generator (DFIG) is placed as the first dominant wind generator type that is installed worldwide since 2004. Its popularity is due to the advantages of its capability to extract more energy compare to the fixed speed type. Moreover, it uses only one-third converter size which reduced the total construction cost compared to its closest rival, Full Converter Wind Turbine Generator Type. Although DFIG widely installed worldwide, it is in fact, very sensitive to the grid disturbances such as frequency variation. Based on IEEE standard for 60 Hz system, a power system should not be allowed to work in less than 59.3 Hz or more than 60.5 Hz. In this paper, DFIG-grid connected is extensively simulated in the condition of frequency variation that is carried out using Matlab/Simulink. The results show that some important parameters such as power output of the generator, voltage at point of common coupling, voltage at DC link and generator speed are experiencing significant rise/drop which in turn might damage the wind turbine generator.

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The Analysis of The Use Calcium Oxide (Anadara Granosa) and Sodium Hydroxide Catalyst Reviewed on Yield of Biodiesel

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Journal of Physics: Conference Series 2020年第1期1500卷

作者： Sahrul Effendy Tahdid Lety Trisnaliani Sandy A Putra Alifah R Hefyani Study Program of Energy Engineering / Chemical Engineering Department State Polytechnic of sriwijaya Srijaya Negara Street Palembang 30139 Indonesia.

The energy crisis in Indonesia is caused by an increase in the need for fuel oil which has increased in the replacement of fossil energy reserves. It's the time to dependency of the petroleum by developing an alternative energy sources that can be renewable. One of the way to overcome this matter is developing the fuel production such as biodiesel which is made by waste cooking oil. The level of FFA is contained the waste cooking oil is used below 5%, namely 1.945% so that the transesterification process can be directly carried out. This research was conducted to determine the effect and the type of catalysts concentration (NaOH and CaO), ((0.5-2.5%) with 3000 ml of waste cooking oil) on the quality of biodiesel. The results of the study shows the effect and the type of catalysts concentration is affected of the quality of biodiesel is produced. The optimum point is using of NaOH catalyst with the amount of catalyst 1% w/w waste cooking oil is yield 84.65%, density 0.8540 gr/ml, viscosity 5.65 cSt, acid number 0.447 mgKOH/gr, water content 0.048%, point flame 167°C, and calorific value 9757.7096 cal/gr, these values have fulfilled the biodiesel quality standards in accordance with SNI-04-7182-2015. while the optimum point is used of CaO catalyst and the amount of catalyst is 2.5% w/w waste cooking oil is yield 58.57%, density 0.8740 gr / ml, viscosity 5.66 cSt, acid number 0.447 mgKOH / gr, water content 0.040 %, flash point 179.6°C, and heating value 9543.5214 cal/gr.

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Microhydo potential in Gunung Pasang plantation Panti Jember East Java

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IOP Conference Series: Earth and Environmental Science 2020年第1期411卷

作者： DE Rahmanto M J Wibowo Study Program of Renewable Energy Engineering Politeknik Negeri Jember PO Box 164 Jember Indonesia

Gunung Pasang plantation is located in Panti-Jember. The Gunung Pasang plantation actually already has a Francis type microhydro turbine with a power output of around 30 kW. However, this power is still too small when compared to energy needs in plantations which can reach 90 kW. The aim of this study is to find the potential of micro-hydro energy in the Gunung Pasang plantation as a reference for developing micro-hydro energy in the plantation. Potential studies are carried out by measuring the discharge using a current meter and measuring the difference of elevation using a automatic level and altimeter. The result of measurement of potential river flow discharge in the dry season is 0.202 cms. The difference in elevation measured at the first point is 54.19 meters and the second point is 113.09 meters. Microhydro power potential by taking a discharge 0.18 was calculated for the first point and the second as 69.61 kW and 145.27 kW, respectively. Utilisation of potential power in the second point was able to meet the electricity needs of the plantation. Economic feasibility analysis is needed if the micro hydro potential is to be developed.

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Dual template using P123-gelatin for synthesized large mesoporous silica for enhanced adsorption of dyes

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South African Journal of Chemical engineering 2023年 43卷 312-326页

作者： Safitri, Widiya Nur Habiddin, Habiddin Ulfa, Maria Trisunaryanti, Wega Bahruji, Hasliza Holilah, Holilah Rohmah, Alya Awinatul Sholeha, Novia Amalia Jalil, Aishah Abdul Santoso, Eko Prasetyoko, Didik Department of Chemistry Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember East Java Keputih Sukolilo Surabaya 60111 Indonesia Chemistry Education Study Program Faculty of Teacher Training and Education Universitas Sebelas Maret Jl. Ir. Sutami 36A Surakarta 57126 Indonesia Department of Chemistry Faculty of Science Universitas Gadjah Mada Sekip Utara Sleman Indonesia Centre for Advanced Material and Energy Sciences Universiti Brunei Darussalam Bandar Seri Begawan BE 1410 Brunei Darussalam Research Center for Biomass and Bioproducts National Research and Innovation Agency of Indonesia (BRIN) Cibinong 16911 Indonesia Department of Food Science and Technology Faculty of Agriculture Halu Oleo University Indonesia College of Vocational Studies Bogor Agricultural University (IPB University) Jalan Kumbang No. 14 Bogor 16151 Indonesia Department of Chemical Engineering Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia 81310 UTM Johor Skudai Johor Bahru Malaysia

Mesoporous Silica with a large mesopore channel was synthesized using the sol-gel method for dye adsorption. A dual template consisting of P123 and gelatin at different ratios was employed in the sol-gel synthesis to enhance surface area and mesopore diameter. Gelatin is a green pore directing agent that strengthens P123 thermal stability during the calcination of silicate gel. Optimization of P123:gelatin ratio to 1:0.02 increased the surface area of mesoporous silica to 561.9 m²/g and expanded the pore diameter to 10 nm. The large pore diameter and surface area enhanced methylene blue adsorption capacity to 363.63 mg/g. The adsorption of methylene blue on mesoporous silica follows the pseudo second-order kinetic and the Langmuir model. Regeneration studies using thermal and chemical treatments exhibited the potential of mesoporous silica as an adsorbent for multiple adsorption-desorption of dyes. © 2022 The Author(s)

关键词： Dual template Dye Gelatin Mesoporous silica Pluronic P123

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Techno-economic analysis of slip ring motor replaced by standard squirrel cage induction motor with VSD

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Journal of Physics: Conference Series 2019年第3期1402卷

作者： H Dewi F H Jufri C Hudaya Department of Electrical Engineering Faculty of Engineering Universitas Indonesia Depok 16424 Indonesia Energy System Engineering Master Study Program Faculty of Engineering Universitas Indonesia Depok 16424 Indonesia

Induction motor slip ring-type technology has been widely used in industrial as one of the crucial electrical components to convert energy mechanically. The construction of this motor is more complex than other standardized induction motors such as squirrel cage. The complexity lies in the connection between the rings and brushes which requires more maintenance. Meanwhile, Squirrel cage motor that is supported by a Variable Speed Drive allows its user to start motor smoothly and adjusts the speed more efficiently. In this study, we exclusively investigate the possibility of the outdated technology replacement by using squirrel cage standardized induction motor based on its compatibility and the financial perspective as well. To prevent any coming up problems, the selections of new motor and VSD must fulfil the requirement of the existing system. Technical data were collected from customer's SCADA and nameplates. While the financial calculation was made based on the payback period. In this case, the payback period is projected within two years and the energy saving could reach 69% that basically depends on operation patterns. According to our perspective, standard squirrel cage motor potentially replaces the slip ring motor in which it is not only having a simple operation but also less maintenance and energy cost.

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Inter-regional electricity system’s long term planning. Case study of Jawa-Sumatera

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AIP Conference Proceedings 2024年第1期2838卷

作者： Hery Affandi Nadilah Reyseliani Widodo Wahyu Purwanto Energy Systems Engineering Study Program Universitas Indonesia Depok 16424 Indonesia Sustainable Energy Systems and Policy Research Cluster Chemical Engineering Department Faculty of Engineering Universitas Indonesia Depok 16424 Indonesia

This study assesses Jawa-Sumatera interregional electricity system’s long-term planning until 2050. The planning is determined based on least-cost optimization in the TIMES model. The model considers a high disparity between regions such as electricity demand, power generation infrastructure, and energy resources. There are twenty-seven technology power generations and three energy storage technologies competing in this model, the modeling also reviews the pattern of generating operations and the role of energy storage on an hourly for each region. A trading scenario was applied to plan power generation with interconnected transmission between Jawa-Sumatera by HVDC transmission. The results show power generation portfolio for BAU and the trading scenario in Jawa and Sumatra is dominated by a gas-based power plant. The trading scenario results in an increase of 70% installed capacity in Sumatera and a decrease of 23% installed capacity in Jawa, an average of 1.96 TWh of electricity is exported every hour to Jawa, a decrease in electricity production cost for Jawa from 10.69 cUSD/ kWh to 9.15 cUSD/kWh and Sumatera from 6.77 cUSD/kWh to 4.88 cUSD/kWh, an increase in renewable energy penetration especially utility-scale PV in Sumatera 19% and a reduction in emissions to 322 gCO2/kWh and required transmission capacity 43.6 GW in 2050 to distribute electricity from Sumatera to Jawa.

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Catalytic cracking of polyethylene terephthalate (PET) plastic waste and palm fibre mixtures using Ni-USY zeolite catalyst

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Journal of Physics: Conference Series 2020年第2期1567卷

作者： Nazarudin N Jayanti O Alfernando I G Prabasari Ulyarti R Sarip Chemistry Engineering Study Program Faculty of Engineering Universitas Jambi Indonesia Center of Energy and Nanomaterial Study Universitas Jambi Indonesia Agricultural Product Technology Study Program Faculty of Agricultural Technology Universitas Jambi Indonesia Chemistry Department Faculty of Science University of Malaya Malaysia

This research was carried out to produce fuel (Oil Liquid Poduct/OLP) from catalytic cracking of a mixture of Polyethylene Terephthalate (PET) and fiber waste from palm oil. USY zeolite was previously ion-exchanged by three levels of Ni-metal concentration (1%, 2%, 3%) before used as catalyst in the cacking process. The catalytic cracking was carried out at rasio of sample to catalyst was 6:1, three levels of temperature (400°C, 425°C and 450°C) and three levels of reaction time (10, 20 and 30 minutes).The SEM images and EDX spectra of Ni-USY zeolite catalysts showed that all catalysts were in crystalline form of FAU framework. The highest of OLP percentage, 24.5%, was produced by catalytic cracking at 450°C for 10 minutes using Ni-USY prepared by ion-exchange using 2% concentration of Nickel Nitrate solution.

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Unlocking development of green hydrogen production through techno-economic assessment of wind energy by considering wind resource variability: A case study

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International Journal of Hydrogen energy 2024年

作者： Hesty, Nurry Widya Aminuddin Supriatna, Nina Konitat Cendrawati, Dian Galuh Nurliyanti, Vetri Nurrohim, Agus Fithri, Silvy Rahmah Niode, Nona Al Irsyad, Muhammad Indra Research Center for Energy Conversion and Conservation National Research and Innovation Agency KST Habibie Serpong Tangerang Selatan153432 Indonesia Research Center for Process and Manufacturing Industry Technology National Research and Innovation Agency KST Habibie Serpong Banten Tangerang Selatan153143 Indonesia Magister of Industrial Engineering University of Mercu Buana Jakarta11650 Indonesia Departement of Mechanical Engineering Universitas Indonesia 16424 Indonesia Survey and Testing Center for Electricity New Renewable Energy and Energy Conservation Technology Ministry of Energy and Mineral Resources Jakarta12230 Indonesia Study Program of Advanced Climatology Departement of Geophysics and Meteorologi IPB University Bogor16680 Indonesia Research Center for Behavioral and Circular Economics Jl. Gatot Subroto No.10 Jakarta12710 Indonesia

Generating hydrogen from renewable energy sources is widely recognized as an effective strategy for addressing critical challenges in the energy sector while contributing to the reduction of greenhouse gas emissions. This study aims to assess the wind energy potential for electricity and hydrogen production in five locations on Sumba Island using 10 years (2011–2020) of data from the NASA's POWER Project. A wind variability assessment was performed on five wind turbines ranging from 500 kW to 1.5 MW and using electrolysis technology. The results indicated a hydrogen production potential of 25–57 tons per year. Economic analysis of hydrogen production for Haharu reveals an attractive internal rate of return (IRR) of 43% with a payback period (PBP) of 2.25 years and a net present value (NPV) of 1.3 MM USD, the levelized cost of electricity (LCOE) of 0.0241 USD/kWh, and the levelized cost of Hydrogen (LCOH) of 1.01 USD/kg. Sensitivity analysis underscores the critical influence of investment and revenue on project profitability, highlighting their substantial impact on determining a project's success or failure. These findings emphasize the potential of Sumba Island as a hub for sustainable energy production to meet the growing demand for clean and renewable energy sources. © 2024 Hydrogen energy Publications LLC

关键词： Clean energy

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Effect of TiO 2 concentration in PVDF-TiO 2 -PVP mixed matrix membrane performance using ultrafiltration process

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Materials Today: Proceedings 2024年 96卷 1-5页

作者： Rianyza Gayatri Erna Yuliwati Ahmad Noor Syimir Fizal Muhamad Zulhilmi Zailani Juhana Jaafar Muzafar Zulkifli Wirach Taweepreda Ahmad Naim Ahmad Yahaya Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology Alor Gajah Melaka 78000 Malaysia Department of Material Science and Technology Faculty of Science Prince of Songkla University (PSU) Hat Yai Songkla 90110 Thailand Program Study of Chemical Engineering Faculty of Engineering Universitas Muhammadiyah Palembang Jalan A.Yani 13 Ulu Kota Palembang 30263 Indonesia Centre for Sustainability of Ecosystem & Earth Resources (Pusat ALAM) Universiti Malaysia Pahang Lebuh Persiaran Tun Khalil Yaakob 26300 Gambang Pahang Malaysia Advanced Membrane Technology Research Centre (AMTEC) Faculty of Chemical and Energy Engineering Universiti Teknologi

This study investigated how the addition of hydrophilic TiO 2 to a porous asymmetric polyvinylidene fluoride (PVDF) Ultrafiltration (UF) membrane altered its properties and performance. The hydrophilicity and flux of PVDF and polyvinylpyrrolidone (PVP) combinations will be lower, and TiO 2 will significantly impact raising those values. By mixing titanium dioxide (TiO 2 ) nanoparticles with a pore-forming agent in a dope solution, PVDF-TiO 2 -PVP membranes were prepared via non-solvent-induced phase inversion method. Experiments using PVDF membranes with varying concentrations of TiO 2 (0, 0.25, 0.5, 1, 1.5, and 2% wt) were applied to evaluate pure water flux and Bovine Serum Albumin (BSA) flux. The functional group composition of membranes was investigated by Fourier transform infrared spectroscopy. The wettability of porous membranes was determined by measuring contact angles. Results demonstrated that membranes constructed from PVDF/PVP/TiO 2 with a lower loading of TiO 2 nanoparticles had a smaller mean pore size, more apertures inside the membrane, and better membrane hydrophilicity. The highest flux of pure water (121 L/m 2 h) was achieved by the PVDF-TiO 2 -PVP mixed-matrix membrane at a TiO 2 concentration of 2 wt%.

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Cultivation of 'Botryococcus Braunii' Microalgae for Hydrocarbons Production and CO2 Bio-fixation

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IOP Conference Series: Materials Science and engineering 2021年第1期1143卷

作者： R G Dewi D Srikaton S Sitorus G N Sevie P Bunga S Permata Chemical Engineering Study Program Institut Teknologi Bandung Indonesia Center for Research on Energy Policy Institut Teknologi Bandung Indonesia

CO2 fixation for climate change mitigation actions through photosynthesis can be carried out by growing intensively managed microalgae. The capability of microalgae in the CO2 fixation is favourable compare to trees or crops, yielding three to five times more biomass per land area than typical plants. Another interesting feature of microalgae is microalgal farms can use arid, semi-arid land or highly saline water, which is practically not suitable for agriculture and other biomass production activities. In addition, algae biomass contains fibre, fatty acid, lipid, protein, polysaccharide, and hydrocarbon. These materials could be extracted for biofuels or biochemicals. Biofuels derived from microalgae are environmentally friendly and carbon neutral. However, microalgal farming seen only for producing biomass as sources of fuels and chemicals probably uneconomical. The yields of microalgal farm to produce fuels/chemicals are also low. Therefore, microalgal farm with the objective of solely producing fuels/chemicals is economically unfeasible. If it is designed for CO2 mitigation measures and all at once for fuels/chemicals production, such endeavour could be economically justifiable. This paper presents results of a research on microalgae cultivation for producing biomass and hydrocarbons for biofuels that simultaneously fixing the CO2 emissions from coal power plant effluent through photosynthesis process, which also for the implementation of circular economy concepts. A strain of 'Botryococcus Braunii' microalgae, which known can produce high hydrocarbons and lipids throughout its growth period has been used. The research identified and evaluated the effect of cultivation medium and CO2 concentration to the growth rate, biomass production, lipid and hydrocarbon content and type. The microalgae were cultivated in bioreactor supported with airlift system for supplying CO2/air and for mixing process. Results of the research show that modified Chu13 (MChu13) is appropr

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