Purwasito, Purwasito (2020) Penentuan Prioritas Start Gas Turbine pada Sistem Blok PLTGU (Studi Kasus : PT PJB Unit Pembangkitan Gresik). Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Sistem Jawa Bali (SJB) adalah sistem kelistrikan yang terintegrasi antara berbagai pembangkit listrik dengan konsumen listrik di Pulau Jawa, Madura dan Bali. Penjadwalan pembangkit pada SJB berdasarkan merit order dari pembangkit yang paling murah ke yang paling mahal. PT PJB Unit Pembangkitan Gresik merupakan salah satu unit yang terhubung dalam SJB. PT PJB UP Gresik mempunyai 3 Blok Sistem Pembangkit Listrik Tenaga Gas Uap (PLTGU). Dalam 1 Blok PLTGU terdiri atas 3 Gas Turbine. Merit Order dari SJB untuk PLTGU ditentukan dalam entitas blok. Karena PT PJB UP Gresik mempunyai 9 Gas Turbine maka muncul permasalahan dalam menentukan prioritas start. Secara umum, Gas Turbine dengan performa operasional terbaik harus diprioritaskan start terlebih dahulu. PT PJB UP Gresik mempunyai Key Performance Indicator (KPI) di Kontrak Kinerja perusahaan yang dipengaruhi oleh performa operasional Gas Turbine. Dua kriteria paling berpengaruh terhadap performa operasional adalah efisiensi dan keandalan. Dalam operasional harian SJB ada probabilitas Gas Turbine berada dalam kondisi beroperasi, kondisi stop dan kondisi start/stop. Oleh karena itu diperlukan metode penentuan prioritas start Gas Turbine berdasarkan perpaduan nilai efisiensi dan keandalan untuk memenuhi permintaan SJB sekaligus mencapai KPI di Kontrak Kinerja perusahaan. Pada penelitian ini, penentuan prioritas start dilakukan melalui tahapan berikut : Metode Analytical Hierarchy Process (AHP) untuk menentukan perbandingan bobot efisiensi dan keandalan, metode Reliability Block Diagram (RBD) untuk menentukan nilai keandalan dan probabilitas kegagalan Gas Turbine dan metode perhitungan heat rate untuk menentukan jumlah energi bahan bakar Gas Turbine. Bobot keandalan dari AHP dengan probabilitas kegagalan dikonversikan sebagai nilai potensial losses produksi Gas Turbine. Sedangkan bobot efisiensi dengan heat rate dikonversikan sebagai biaya bahan bakar. Prioritas start Gas Turbine ditentukan berdasarkan perpaduan nilai potensial losses produksi dan biaya bahan bakar. Dimulai dari Gas Turbine dengan perpaduan biaya terendah sampai tertinggi. Dari penelitian ini dapat diketahui performa operasional Gas Turbine berdasarkan kriteria efisiensi dan keandalan yang kemudian digunakan untuk menentukan prioritas start Gas Turbine. Penerapan metode penentuan prioritas start Gas Turbine meningkatkan pencapaian KPI di Kontrak Kinerja perusahaan.
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Jawa Bali System (SJB) is an intregated electrical system between various power plants with electricity consumers around Jawa, Madura and Bali islands. Power plant scheduling in SJB is based on merit order from the cheapest power plant to the most expensive power plant. PT PJB Unit Pembangkitan Gresik is one of the units connected to SJB. PT PJB UP Gresik has 3 blocks of Combine Cycle Power Plant (CCPP). Each block has 3 units of Gas Turbine. Merit Order from SJB for CCPP is determine in block entity. Because PT PJB UP Gresik has 9 units of Gas Turbine, problem arise in determining start priority of Gas Turbine. In general, Gas Turbine with the best operational performance should be prioritized. PT PJB UP Gresik has a Key Performance Indicator (KPI) on the company’s Performance Contract which is affected by the Gas Turbine operational performance. The two most influential criteria for operational performance are efficiency and reliability. In the daily operations of SJB, there is a probability that the Gas Turbine is in an operating condition, a stop condition and a start/stop condition. Therefore a Gas Turbine start priority determination method is needed based on a combination of efficiency and reliability values to meet the demand of SJB while achieving the KPIs in the company’s Performance Contract. In this research, start priority determination is conducted by phase as follows : Analytical Hierarchy Process (AHP) method to determine the priority value of efficiency and reliability. Reliability Block Diagram (RBD) method to determine the reliability and failure probability of Gas Turbine and heat rate calculation method to determine the amount of fuel energy of Gas Turbine. The priority value of reliability from AHP with failure probability are convert as potensial losses production of Gas Turbine. While the priority value of efficiency from AHP with heat rate value are convert as fuel cost. Start priority of Gas Turbine is determine by the combination value of potensial losses of production and fuel cost of Gas Turbine. Starting from the Gas Turbine with the lowest combination cost to the highest combination cost. From this research, it can be seen the operational performance of Gas Turbine based on efficiency and reliability criteria which are then used to determine the start priority of Gas Turbine. Implementation of start priority determination method increase KPI achievement of company Performance Contract.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTMT 658.403 Pur p-1 2020 |
| Uncontrolled Keywords: | Gas Turbine, efisiensi, keandalan, prioritas start, Analytical Hierarchy Process (AHP), Reliability Block Diagram (RBD) |
| Subjects: | T Technology > T Technology (General) > T58.8 Productivity. Efficiency T Technology > TJ Mechanical engineering and machinery > TJ778 Gas turbines |
| Divisions: | Faculty of Creative Design and Digital Business (CREABIZ) > Technology Management > 61101-(S2) Master Thesis |
| Depositing User: | Purwasito Purwasito |
| Date Deposited: | 04 Dec 2024 01:03 |
| Last Modified: | 04 Dec 2024 01:03 |
| URI: | http://repository.its.ac.id/id/eprint/74002 |
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