Connection substation for wave energy converters in a wave power station

A connection substation (100) for a plurality of wave energy converters (WEC1, WEC2) being part of a wave power station (101), said connection substation (100) comprising at least one transformer (102) and at least one connecting device (103) for electrically connecting a plurality of input power cables (C1, C2), for transmission of generated electric power from said wave energy converters (WEC1, WEC2), to a common output cable (C3), for transmission of electric power from the wave power station (101) to an electrical grid, wherein said connection substation (100) is provided with at least one buoyant body portion (104) for providing a buoyancy force and at least one fastening device (105) for securing at least one mooring line (106) connected to an anchor (107),

• wherein the connection substation (100) exhibits an elongated shape having an upper rod portion (108) exhibiting a top end (109), and furthermore exhibits a bottom end (111), wherein said buoyant body portion (104) is disposed between said upper rod portion (108) and said bottom end (111),
• that the upper rod portion (108) is designed with a greater length in the longitudinal direction of the connection substation (100) and a smaller circumference in a plane perpendicular to the longitudinal direction than said buoyant body portion (104),
• that the length of the upper rod portion (108) and the buoyancy force of said buoyant body portion (104) are chosen taking into account expected water level and wave conditions and weight of the anchor (107) so that, after adjusting the length of the mooring line (106) to actual water depth, securing the mooring line (106) to the fastening device (105) and dropping the anchor (107), the mooring line (106) and the connection substation (100) into a body of water (112), the bottom end (111) and at least the major portion of the buoyant body portion (104) will be held down under the water surface (112) by the mooring line (106) in all water levels and wave conditions and so that the top end (109) of the upper rod portion (108) will be located above a mean water level of the body of water (112), which also corresponds to a design waterline (A) of the connection substation (100),
• that said at least one fastening device (105) is disposed in the vicinity of the bottom end (111) at a distance from an upper end (113) of the buoyant body portion (104),
• that said at least one connecting device (103) is disposed in a waterproof compartment in the connection substation (100), and
• that each of said plurality of input power cables (C1, C2) are run so that at least a portion of the cable extends up to a level at least 2 meters above said design waterline (A).