Pemodelan Dan Simulasi Sistem Pengontrolan Tegangan Dan Frekuensi Generator Induksi Tipe Doubly Fed Aplikasi Pada Pembangkit Listrik Tenaga Angin

Simulasi ini menghasilkan suatu keluaran berupa tegangan, arus, daya, dan kecepatan angin per detik. Hasil dari keluaran simulasi ini dapat digunakan untuk menganalisa karakteristik suatu turbin angin yang sedang dirancang atuapun turbin angin yang akan dipasang di suatu daerah yang telah diketahui kecepatan angin rata-ratanya. Masing-masing bagian dibangun dalam bentuk blok-blok tersendiri dan data-data dari bagian tersebut dapat dimasukkan secara terpisah dari sistem. Persamaan rotor turbin yang diperoleh dari literatur dikonversikan kedalam bahasa matlab/simulink sehingga diperoleh satu blok rotor turbin dimana data-datanya dimasukan melalui dialog box yang lebih dikenal dengan grafik user interface (GUI) yang merupakan fasilitas dari matlab simulink.Demikian juga untuk bagian-bagian yang lain seperti : transmisi mekanik (gear box), generator, pengaturan tegangan dan frequensi, beban dan kapasitor. Setelah semua blok terbentuk dan telah diuji sesuai dengan karakteristik masing-masing, maka selanjutnya blok-blok tersebut dirangkai sesuai dengan turbin angin sesungguhnya dan simulasi turbin angin siap dijalankan. Hasil simulasi menunjukan tegangan yang dihasilkan sesusai dengan yang diharapkan yang berarti pengaturan tegangan frekuensi bekerja dengan bai

Pengaruh Partikel Nanosilika Terhadap Sifat Tolak Air Bahan Isolasi Bionanokomposit

The nature of hydropobicity plays an important role of an insulator, especially the outdoor insolator which is always exposed to hot, cold, humid weather and rain water. In the long run, the surface of the insulator can be damaged and its hydropobicity properties will be reduced or even lost so that surface discharge events will be easier to occur, especially in the rainy season. As a new material being developed, bionanocomposite insulation materials from LDPE, natural rubber and nanosilica fillers have passed several dielectric properties such as partial discharge characteristics under normal conditions and at higher temperature conditions. To complete the assessment of dielectric properties, a new bionanocomposite material hydropobicity was tested. There were 4 types of samples tested with the weight of the nanosilica material 1.5%, 3.0%, 4.5% and 6% of the total weight of the biocomposite sample. The test was carried out using a high-resolution camera to take pictures of the surface of the insulator sample that was dripped with water. The results show that nanosilica can increase the angle of contact of water with the bionanocomposite surface. This increase indicates an increase in the hydropobicity of bionanocomposite materialKeywords : LDPE, Karet Alam, Natural Rubber, nanosilica, hydrophobisity AbstrakSifat hidropobisitas memainkan peran penting dari sebuah isolator, terutama isolator pasang luar yang selalu terpapar oleh perubahan cuaca panas, dingin, lembab dan air hujan. Dalam jangka panjang, permukaan isolator bisa rusak dan sifat hidropobisitasnya akan berkurang bahkan hilang sehingga peristiwa peluahan permukaan akan lebih mudah terjadi, terutama pada musim hujan. Sebagai material baru yang sedang dikembangkan, bahan isolasi bionanokomposit dari polietilena berkerapatan rendah (LDPE), karet alam (NR) dan pengisi nanosilika telah melewati beberapa pengujian sifat dielektrik seperti karakteristik peluahan sebagian pada kondisi normal dan pada kondisi suhu yang lebih tinggi. Untuk melengkapi pengkajian sifat dielektrik, maka dilakukan pengujian sifat hidropobisitas bahan bionanokomposit yang baru tersebut. Sampel yang diuji ada 4 jenis dengan kada berat bahan nanosilika 1,5%, 3,0%, 4,5% dan 6% dari berat total sampel biokomposit. Pengujian dilakukan dengan menggunakan kamera beresolusi tinggi untuk mengambil gambar permukaan sampel isolator yang ditetesi air. Hasil menunjukan bahwa nanosilika dapat memperbesar sudut kontak air dengan permukaan bionanokomposit. Peningkatan ini mengindikasikan meningkatnya sifat hidropobisitas material bionanokomposit.Kata Kunci : Biokomposit, Hidropobisitas, Karet Alam, LDP

Feasibility Study of Rooftop Grid Connected PV System for Peak Load Reduction

This paper presented the economic feasibility analysis of grid-connected photovoltaic on the roof of building, to reduce peak electrical demand. The Engineering Faculty electrical system is used as case study of PV system economic feasibility. The economic calculation assumptions used are: electricity tariff IDR 1114.74 per kWh based on electricity tariff for medium voltage load, estimated annual module degradation 0.5% and the life expectancy of the solar panels 25 years. The interest rate using of Bank Indonesia (BI) rate for 2018 i.e. 4.25% and inflation rate 3% also considered. The initial investment required to build 117.5 kWp PV system is IDR 2,413 million. The operational and maintenance costs are estimated 1% of initial investment per year. The result of cash flow rate shows that a positive NPV is achievable and payback period less then solar panels life expectancy. The simple payback period is 11 years and discounted payback period calculated by consider multiple parameters to be 14 years. The result of economic analysis using current rate value indicate that the project is profitable

Sistem Pengatur Tegangan Otomatis : Analisa Peralihan Dengan Pengendali Tunggal Dan Kaskade

This journal describes the design and analysis of the response of a single controller and cascade direct current type of Automatic Voltage Regulator (AVR) system. The direct current AVR system is represented form of a transfer function. For single and cascade controllers, it is designed using a parallel architecture using MATLAB software with predetermined design criteria. The types of controllers used consist of Proportional Differential (PD), Proportional Integral (PI), Proportional Integral Differential (PID), Proportional Differential with First Order Filters in the Differential Section (PDF) and Proportional Integral Differentials with First Order Filters in the Differential Section(PIDF). For the transition analysis, the observed parameters consist of rise time, peak time, steady state time, maximum pass value and peak value. The results of the analysis show that the controllers that meet the design criteria are Proportional Differential (PD) controllers and Proportional Differential controllers with First Order Filters in Differential Sections (PDF) for single controllers and cascade controllers. For a single controller, the value of the Proportional constant (Kp) is 0.6280 and the value of the Differential constant (KD) is 0.1710 for the Proportional Differential (PD) controller. Proportional constant value (Kp) is 0.6130, Differential constant value (KD) is 0.1710 and filter constant value (Tf) is 0.0009 for Proportional Differential controller with First Order Filter in Differential Section (PDF). Cascade controllers and Proportional Differential (PD) controllers, the Proportional constant (Kp) is 1.7300 and the Differential constant (KD) is 0.0242 for the inner circle (C2). Outer ring controller (C1), the proportional constant (Kp) is 179,000 and the Differential constant (KD) is 2.4600. Cascade controllers and Proportional Differential controller types with First Order Filters in the Differential Section (PDF), the Proportional constant (Kp) value is 1.5900, the Differential constant (KD) value is 0.0246, the filter constant value (Tf) is 0.0018 for the inner circumference (C2 ). For the outer ring controller (C1), the Proportional constant (Kp) value is 134,0000, the Differential constant (KD) value is 2.2900 and the filter constant value (Tf) is 0.00008

Optimal Sizing of Micro Hydropower to Improve Hybrid Renewable Power System

This paper presents an analysis of optimal micro hydropower (MH) capacity of hybrid systems to improve renewable energy based power systems. The electricity system was designed by considering river water flow data and solar radiation data at the research location, Andalas University. Optimal results obtained for the configuration of the Grid, MH, and PV with a head height of 30 m and a flow rate of 800 L/s with the lowest COE value of $ 0.065. As an optimal sizing system has been able to increase the composition of renewable energy generation in the Unand electrical network. The renewable energy fraction has increased from 26.4% to 36.5%. Therefore, determining the optimal capacity will increase the use of renewable energy generation. Conversely, an increase in electricity supply from renewable energy plants will reduce electricity consumption from the PLN grid. The latest excess power generation at a low load can be sold to the PLN gri

Karakteristik Medan Listrik-Dekat Petir Positive Cloud to Ground

This study was conducted on 19 electric field data near positive lightning cloud to ground (+CG). The electric field change of +CG lightning consist of preliminary breakdown (PB) and return stroke (RS). The analysis conducted in this research are: PB/RS ratio, PB-RS separation, pre-return stroke duration, pulse train duration, and individual pulse duration. Furthermore, the relationship between +CG lightning and cloud image satellite was observed the average value of PB/RS ratio, PB-RS separation, prereturn stroke duration, pulse train duration and individual pulse duration were 13,89%, 91,53 ms, 102,23 ms, 1,20 ms,150,31 μs, respectively

Peningkatan Faktor Penuaan Arester Tanpa Sela Isolasi Polymer Akibat Kontaminan Kalsium Karbonat

Gapless arester leakage current can be used as an indicator to determine the aging level of the arester. Leakage current is influenced by contaminants present in the arester insulation. This paper analyzes the effect of contamination on arester leakage currents as an indicator of arester aging. Contaminants used are calcium carbonate plus kaolin dissolved into water, to determine the level of calcium carbonate contaminants, the ESDD (Equivalent Salt Deposit Density) method is used. Contaminated aresters are measured as leakage currents flowing to the block elements and to the arester insulation. Based on experiments that have been carried out, the increase in leakage current of the arester on the block element that increases the leakage current to the level of light, medium and heavy contamination rises by an average of 17.5% for the voltage of all test voltages. While at low and moderate contamination the leakage current that occurs in the polymer arester insulation does not significantly change, the leakage current generated is linear with the level of contaminants in the arester body. It can clearly be concluded that the effect of contamination is very significant in changes in leakage currents. Keywords : Gapless arester, Leakage current, Kontamination, Aging, Abstrak Arus bocor arester tanpa sela dapat digunakan sebagai indikator untuk menentukan tingkat penuaan arester. Arus bocor dipengaruhi oleh kontaminan yang ada pada isolasi arester. Paper ini menganalisa pengaruh kontaminasi terhadap arus bocor arester sebagi indikator penuaan arester. Kontaminan yang digunakan adalah kalsium karbonat di tambah kaolin yang di larutkan kedalam air, untuk menentukan tingkat kontaminan kalsium karbonat maka digunakan metode ESDD (Equivalent Salt Deposit Density). Arester yang sudah berkontaminasi diukur arus bocor yang mengalir pada elemen blok dan pada isolasi arester. Berdasarkan percobaan yang telah dilakukan, kenaikan arus bocor arester pada elemen blok bahwa kenaikan arus bocor untuk tingkat kontaminasi ringan,sedang dan berat naik rata-rata 17.5 % untuk semua tegangan uji. Sementara pada kontaminasi rendah dan sedang arus bocor yang terjadi pada isolasi polimer arester tidak. singnifikan perubahannya,Arus bocor yang dihasilkan linier dengan tingkat kontaminan pada badan arester. Secara jelas dapat disimpulkan bahwa pengaruh kontaminasi sangat signifikan dalam perubahan arus bocor. Kata Kunci : Arester tanpa sela, Arus bocor, Kontaminasi, Penuaan

PENGEMBANGAN SIMULASI KOMPUTER UNTUK MENENTUKAN KARAKTERISTIK PEMBANGKIT LISTRIK TENAGA ANGIN

Simulasi ini menghasilkan suatu keluaran berupa tegangan, arus, daya, dan kecepatan angin per detik. Hasil dari keluaran simulasi ini dapat digunakan untuk menganalisa karakteristik suatu turbin angin yang sedang dirancang atuapun turbin angin yang akan dipasang di suatu daerah yang telah diketahui kecepatan angin rata-ratanya. Masingmasing bagian dibangun dalam bentuk blok-blok tersendiri dan data-data dari bagian tersebut dapat dimasukkan secara terpisah dari sistem. Persamaan rotor turbin yang diperoleh dari literatur dikonversikan kedalam bahasa matlab/simulink sehingga diperoleh satu blok rotor turbin dimana data-datanya dimasukan melalui dialog box yang lebih dikenal dengan grafik user interface (GUI) yang merupakan fasilitas dari matlab simulink.Demikian juga untuk bagian-bagian yang lain seperti : transmisi mekanik (gear box), generator, beban dan kapasitor. Setelah semua blok terbentuk dan telah diuji sesuai dengan karakteristik masing-masing, maka selanjutnya blok-blok tersebut dirangkai sesuai dengan turbin angin sesungguhnya dan simulasi turbin angin siap dijalankan.Dengan mengambil data dari salah satu turbin angin komersial dengan daya nominal 60 kW disimulasikan dengan kecepatan angin rata-rat 10 m/det. Hasil simulasi menunjukan tegangan yang dihasilkan 380 volt puncak ke puncak dan daya aktif 60 kW dan daya reaktif sekitar 50 kVar

Disturbance Modeling on Transmission Lines Using Wavelet Transform Method: A Review

This paper introduces a number of methods for identifying disturbances on transmission lines and provides algorithms for classifying various disturbance types. working with the discrete wavelets transform (DWT) and various embedded systems techniques using a simulator to carry out digital simulations of system trials using the controlled technique, the nature of disturbance in distinct sub-systems is determined. The analysis of transmission lines using the wavelet transform is the main topic of this study, along with techniques for transmission line protection. These factors include channel capacity, channel length, simulation software, mother wavelet type, parameters, sampling frequency, and type of disturbance analysis

Perencanaan Pengembangan Modul Pembelajaran Matematika Untuk Warga Belajar Paket C Berbasis Open Source (Scilab) di Pusat Kegiatan Belajar Masyarakat (PKBM) Karang Putih

The planning for the development of a mathematics learning module for residents studying package C based on the open-source platform Scilab at the Community Learning Center (PKBM) Karang Putih is one of the solutions to address the lack of facilities, especially open-source learning media. The activity plan started with discussions and information sharing. In this stage, discussions and experiences were shared regarding the Scilab-based mathematics learning module for package C learners. The second activity is the analysis of the module's needs. Based on the discussion's outcomes, decisions will be made about the type of module to be created, the required features, potential challenges, necessary resources for the development process, and so on. The third activity is the design of the learning module. During this phase, the interface and layout of the open-source Scilab-based mathematics learning module are designed. The final activity is the development of the learning module. This stage involves implementing the outcomes of the analysis and design of the mathematics learning module. It also includes testing to ensure that all functions work as intended. By following this planned process, the development of the mathematics learning module for package C learners using Scilab will be expected to provide a valuable open-source learning resource at the Community Learning Center (PKBM) Karang Putih