Design And Analysis of an Array of Floating Wind Turbine Structures

Hong, Sa Young (Maritime and Ocean Engineering Research Institute (MOERI)) | Hong, Seok Won (Maritime and Ocean Engineering Research Institute (MOERI)) | Nam, Bo Woo (Maritime and Ocean Engineering Research Institute (MOERI)) | Kim, Yunho (Maritime and Ocean Engineering Research Institute (MOERI))

OnePetro 

ABSTRACT:

Global performance of an array of floating wind turbine structures is investigated through numerical analysis by using 9-node higher-order boundary element method. Multi-body hydrodynamic interaction between floating wind turbine structures is considered based on generalized mode approach. Connecting structures between floating wind turbines is devised and the performance evaluation was conducted considering elastic deformation of the connecting structures. Technical feasibility of such an array structures for floating wind farm is discussed based on global performance evaluations.



INTRODUCTION

It is widely understood that the needs of renewable energy resources will be rapidly increasing due to limited oil and gas reservoirs, the one of most popular energy sources so far. To achieve this challenging goal it is necessary to use offshore wind resources rather than those on land and onshore. Therefore the efforts to utilize offshore wind energy have led to floating wind turbine concept which makes it possible to install wind turbine tower structures in deeper water region where better wind quality is available compared with on land wind turbine. The concept of using offshore floating wind turbines was introduced by Professor William E. Heronemus(1972). As of 2003, existing offshore fixed-bottom wind turbine technology deployments had been limited to water depths of 30 meters. It has been well known that worldwide deep-water wind resources are extremely abundant in deep sea areas with depths up to 600 meters(Wikipedia,2012). Concerning to use of offshore wind, there have been a number of conceptual design studies on floating wind turbine structures, to name a few Jonkman(2010), Robertson et al.(2011), Myhr et al.(2011) and Shin(2011). Most of studies were on spar type structures like OC3- Hywind and variations of mooring system of spar platform, barge and semi-submersibles. Recently ‘Windfloat’ is emerging, which is based on semi-submersible design concept with high damping plate(Roddier et al., 2010).