With the increasing use of the present social resources, fossil energy resource is at risk. So it’s imperative to tap the renewable resource. The ocean resource is a kind of reproducible
green resource. Oscillating-buoy becomes a main kind of wave energy converter (WEC) which could extract wave energy from its oscillating motion. In this paper，a hydraulic power take-off
device for oscillating buoy wave energy converter on artificial breakwater is designed, the hydrodynamic analysis of the oscillating-buoy is performed with ANSYS-AQWA, including
added mass and radiation damping coefficient. The mathematical model of linear PTO is established and simulated with SIMULINK to get the power generating ability of the oscillating-buoy with the linear PTO. In addition, a hydraulic PTO system is designed and the its dynamics is simulated with AMESim. Finally, the control strategy of constrained motion of PTO is proposed to ensure safe operation under high sea states.