Abstract
The installation of fixed offshore wind power systems at greater water depths requires a floating body at the foundation of the system. However, this presents various issues. This study analyzes the characteristics of the platform motion of a floating offshore wind turbine system based on the performance of the pitch controller. The motion characteristics of the platform in a floating offshore wind power generation system, change according to the response speed of the blade pitch controller since the wind turbine is installed on a floating platform unlike the existing onshore wind power generation system. Therefore, this study analyzes the platform motion characteristics of a floating offshore wind turbine system using various pitch controllers that have been applied in previous studies. Consequently, an appropriate pitch controller is proposed for the floating offshore wind turbine system. The floating offshore wind turbine system developed in this study consists of an NREL 5-MW class wind turbine and an OC4 semi-submersible floating platform; the pitch controller is evaluated using FAST-v8 developed by NREL. The results of this study demonstrate that the pitch controller reduces the platform motion of the floating offshore wind power generation system, considering both the individual pitch control and the negative damping phenomenon. Additionally, it is confirmed that the output increases by approximately 0.42%, while the output variability decreases by 19.3% through the reduction of the platform movement.
Highlights
There has been an increasing demand in recent years for the reduction of greenhouse gas emissions from renewable energy sources
The pitch controllers implemented for both land and offshore applications are composed of a collective pitch controller (CPC)
In the floating offshore wind turbine system, the power generation performance and the floating body movement are changed according to each pitch controller
Summary
There has been an increasing demand in recent years for the reduction of greenhouse gas emissions from renewable energy sources. Extensive research is being conducted on the development of technology in offshore wind power generation, which is one of the main forms of marine energy [1]. The early offshore wind power generation system generally consisted of a foundation formed by a monopile fixed to the seabed at a depth of 50 m or less, a gravity-based structure, a jacket, and a wind turbine at the top [3]. A floating body is required at the bottom of the fixed offshore wind power system foundation for installation at a greater water depth [4]. Several studies have been actively conducted in recent years on floating offshore wind power generation systems while considering the practical offshore conditions [5]
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