以FAST+SIMPACK+MATLAB實現5MW浮動半潛式離岸風力發電機動態分析之研究

Abstract

本研究採用美國國家再生能源實驗室NREL所提供的5MW風力發電機做為主體，結合OC4半潛式浮動平台及錨碇系統進行探討，透過整合空氣動力、波浪力、風機系統動態及控制系統動態分析，發展浮動半潛式離岸風力發電機之全系統動態模擬與分析，並探討風力發電機組受不同風況及有義波高等影響下對發電功率的影響。本研究透過軟體FAST以及SIMPACK結合軟體MATLAB進行全系統動態模擬與分析，由SIMPACK建立浮動半潛式離岸風力發電機組動態模型，包含浮台、繫纜、塔架、機艙及葉片模型，並透過軟體AeroDyn及軟體HydroDyn進行風機氣動力分析(Aerodynamic Analysis)及水動力分析(Hydrodynamic Analysis)，浮動式平台的錨碇系統則使用軟體MAP++進行繫纜作用力分析，SIMPACK將上述力學分析以個別的力元(Force Element)作用在對應的風力發電機機組結構上，最後與MATLAB所建立的各項子系統，包含發電機系統的直驅式永磁同步發電機(Direct-Drive Permanent Magnet Synchronous Generator)結合磁場導向控制(Field-Oriented Control) 、電網側轉換器控制(Grid-Side Converter Control)及閥控液壓葉片變旋角系統進行數據交換，最終整合FAST、SIMPACK以及MATLAB完成浮動半潛式離岸風力發電機全系統動態模擬與控制，輸入不同有義波高及風況，分析浮動半潛式離岸風力發電機發電系統運動及其對發電功率之影響。

This research combined the NREL 5MW wind turbine model with the OC4-DeepCwind semi-submersible platform and mooring system to achieve the overall system dynamic simulation and control. Through the integration of aerodynamics, wave force, wind turbine mechanism dynamics and control system dynamic analysis, the dynamic simulation and analysis of semi-submersible floating offshore wind turbine can be achieved for investigate the impact of wind turbine control and generation power under the different wind and wave conditions. This research implements the dynamic simulation and analysis for the semi-submersible floating wind turbine by combining software FAST, SIMPACK and MATLAB. SIMPACK is used to create the model of semi-submersible floating offshore wind turbines, including floating platform, mooring line, tower, nacelle and blades. FAST is used to perform aerodynamic analysis and hydrodynamic analysis through AeroDyn and HydroDyn toolbox. The mooring system of the floating platform is analyzed by the software MAP++. SIMPACK is applied to implement the mechanism dynamic analysis of wind turbine structure and blades. MATLAB serves to model the subsystems, including the direct-drive permanent magnet synchronous generator, the grid-side converter control, the variable-pitch control system by hydraulic servo control. Through the co-simulation of FAST, SIMPACK and MATLAB, the overall system dynamic simulation of 5MW semi-submersible floating offshore wind turbine can be achieved. The impact of control and power generation can be analyzed under different wind and wave conditions.