SPAR-TYPE FLOATING OFFSHORE WIND TURBINE HYDRODYNAMIC DESIGN AND FIELD PLANNING IN INDONESIA: CASE STUDY IN SOUTH SULAWESI OFFSHORE

• Main Author: Vito Nabasa, Duncan
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61818
• Institution: Institut Teknologi Bandung

Indonesia has a potential for application of offshore wind generated power production to meet electricity demand for human daily activities. In this study, floating offshore wind turbine (FOWT) as one of the offshore wind power generators will be analyzed for Indonesia’s potential offshore wind power. One of the existing wind turbine designs is a 5 MW wind turbine by NREL that used a spar type foundation and concrete ballast as its main stabilizer with the additional mooring line system to hold the structure movement. Therefore, the wind turbine will be analyzed with the environmental load data of Indonesia’s sea on the potential location for wind power production. The study is conducted for the static stability and the movement of the structure, and the mooring tension analysis for the mooring lines. The design criteria are based on the DNVGL and API standards for spar structure and mooring lines. The process will include modelling the overall structure with hydrodynamic software to generate the hydrostatic parameter and structural response to the designed environmental condition. Later, the designed structure will be combined with a mooring line system for seakeeping analysis. The environmental condition is checked for 0o and 180o heading while the mooring system will be variate based on the pretension given to the mooring line by moving the anchor position. The result shows that the existing structure will meet the criteria for static stability with GM greater than 1 m, offset lower than 32 m, and mooring tension less than 80% from the minimum breaking load. Afterwards, the field planning for the wind farm that consists of several wind turbines will be performed. This is to predict the levelized cost of energy or LCOE produced by the planned wind farms. The result for 150 MW wind farm capacity could generate 5189.5 GW power for 27 years of life-cycle, equal to 22.64% of its original capacity. Affected by the power generation and investment cost, the LCOE for the planned wind farm is 1674.79 IDR per kWh which is higher than the conventional tariff. Therefore, the evaluation was also conducted to generate a more compatible tariff for wind power production in Indonesia. The study also includes the additional discussion for future works which include the various pretension mooring analysis to increase the efficiency of financial and field planning aspects of the project, and the wind farm layout configuration evaluation for project area optimization.