ABSTRACT:

When analyzing the aerodynamic loads of floating wind turbines, most professional programs didn_t consider the motions of foundation. Therefore, deviation is present inevitably. This paper is mainly focused on the effect of pitch motion on the aerodynamic loads and output power performance of the floating wind turbine. Pitching response of the floating foundation was figured out and a comparison was made between aerodynamic loads calculated under pitch motion and the calculation results of fixed wind turbines. The results show that the generator power fluctuates more widely and the flap of the blades is more acute due to pitch motion.

INTRODUCTION

There is a large reserve of wind energy on earth. Wind energy is a kind of clean energy which is renewable and friendly to the environment. The exploitation and utilization of wind energy is of great importance to the sustainable development of our human society. For the purpose of reducing the cost and commerce application of wind power generation, high power generator is used more and more widely. Considering the effects on environment and the quality of wind energy, installing high power generator in the deep sea has become the general trend. As the water depth increases, the cost of construction, installation and maintaining of the fixed foundation such as jacket platform and gravity platform rises sharply. There are several types of floating foundations, including TLP, SPAR, semisubmersible, etc (Jonkman, 2007). When aerodynamics of the wind generator is researched, the flow field is usually considered as a steady flow which is vertical to the rotor plane. However, the flow of wind is actually very complicated, containing both periodic components, such as mean wind speed, yaw control, influence by the tower shadow, etc, and non-periodic components, such as turbulence and wake.

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