| Budget Amount *help |
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2013: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2012: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2011: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
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| Research Abstract |
Wind turbines are usually controlled with the pitch control to keep the rotor speed stable and to avoid the overload. However, the control causes some troubles for the operation of floating offshore wind turbine. Specifically, the tower oscillating motion is increased, which is called as the negative damping of floating wind turbine. Negative damping problem induces the increasing of tower fatigue load. This study describes an original concept, named as RTS control, of pitch control system for floating wind turbine to control turbine rotation and tower movement. The concept of RTS is to control the blade pitch with rotor speed and tower pitch angler velocity. Simulation results are well matched to tank test. Simulations in steady wind and regular wave condition show that RTS control has the ability to avoid negative damping. It is also confirmed that RTS control avoids negative damping and reduces fatigue load of tower maintaining the power in the fluctuating wind and irregular wave.
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