Reduction of wave-induced pitch motion of a semi-sub wind platform by balancing heave excitation with pumping between floats

Abstract It is desirable to control pitch motion of semi-submersible wind platforms reduce turbine hub acceleration and increase structural fatigue life. This achieved by balancing the moment on platform due heave float excitation generating a differential internal head water between floats though pump. demonstrated with an experimentally validated linear diffraction-radiation-drag model idealised platform. Different scales are considered corresponding 5, 10 20 MW turbines. The angles accelerations generally as increase. Pumping reduces up about 40% for larger sea states. power required pumping would be small hybrid pump also operating store energy operation. Without storage requirement still relative capacity except very high speeds.