Submerged wave energy converter for deep water operations

A wave energy converter apparatus, comprising:

• an absorber body having positive buoyancy when fully submerged;
• a power take-off unit embedded into the absorber body, the power take-off unit directly coupled to an angled mooring line, the angled mooring line to be anchored to a sea floor, the power take-off unit being operable to perform motion energy conversion based on displacement of the absorber body due to wave excitation,
• wherein the power take-off unit extracts net positive energy from surge, sway, heave, roll, and pitch motion of the absorber body;
• and
• a ballast system to control buoyancy of the absorber body.

A method for using a wave energy converter apparatus, comprising:

• submerging an absorber, the absorber having a body having an upper surface and a bottom surface, wherein the absorber has a positive buoyancy when fully submerged;
• extracting energy from incident ocean waves using a first power take-off unit embedded into the absorber body, the first power take-off unit being directly mechanically coupled to a first angled mooring connection, the first angled mooring connection anchored to a sea floor;
• and
• extracting energy from incident ocean waves using a second power take-off unit embedded into the absorber body, the second power take-off unit being directly mechanically coupled to a second angled mooring connection, the second angled mooring connection being anchored to the seafloor, wherein the first and second power take-off units perform motion energy conversion based on displacement of the absorber body due to wave excitation, and
• wherein the first power take-off unit and the second power take-off unit extract net positive energy from at least one of surge, sway, heave, roll, and pitch motion of the absorber body.