Offshore wind turbine system and offshore platform

An offshore wind turbine system comprising a wind turbine in combination with a floating platform, the platform comprising a tower support that carries a tower of the wind turbine, the tower carrying a wind rotor:

• wherein the platform comprises three buoyancy modules providing buoyancy to the platform when in water, the three buoyancy modules being arranged in an triangular configuration in corners of an equilateral triangle, in the center of which the tower support is located:
• wherein the tower support includes a centerline coinciding with a centerline of the tower and being located in the center of the triangle:
• wherein the tower support is fixed in a frame includes three radial braces, each of the radial braces rigidly connecting the tower support with one of the three buoyancy modules:
• wherein each radial brace has a brace centerline, the brace centerline having an angle α with the tower support centerline;
• and that the radial braces are inclined upwards from the tower support towards the buoyancy modules, wherein the angle α is in the range of 80° to 87° and wherein the buoyancy modules have a height H, and wherein the radial braces are connected to the buoyancy modules at a position between 0.4 and 0.6 of the height H, wherein the buoyancy modules comprises buoyancy members such as buoyancy tanks, which are interconnected by connecting rods to the rigid frame, wherein the connecting rods extend through the buoyancy members and fasten the radial braces to the buoyancy modules, wherein the level of the connecting rods under normal conditions is at the water surface, and wherein the system in water is dimensioned for floating at a level in the water where at least 80% of the radial braces are under water for contributing to the buoyancy.

An offshore platform for a wind turbine that comprises a tower with a rotor;

• wherein the offshore platform comprises:
• three buoyancy modules providing buoyancy to the platform when in water, the three buoyancy modules being arranged in an triangular configuration in corners of an equilateral triangle, in the center of which a tower support is located for carrying the tower;
• wherein the tower support includes a centerline coinciding with a centerline of the tower when mounted on the platform and being located in the center of the triangle;
• wherein the tower support is fixed in a frame comprising three radial braces, each of the radial braces rigidly connecting the tower support with one of the three buoyancy modules;
• wherein each radial brace has a brace centerline, the brace centerline having an angle α with the tower support centerline;
• and the radial braces being inclined upwards from the tower support towards the buoyancy modules, wherein the angle α is in the range of 80° to 87° and wherein the buoyancy modules have a height H, and wherein the radial braces are connected to the buoyancy modules at a position between 0.4 and 0.6 of H;
• wherein the buoyancy modules include buoyancy members such as buoyancy tanks, which are interconnected by connecting rods to the rigid frame, wherein the connecting rods extend through the buoyancy members and fasten the radial braces to the buoyancy modules, wherein the level of the connecting rods under normal conditions is at the water surface;
• and
• wherein the system in water is dimensioned for floating at a level in the water where at least 80% of the radial braces are under water for contributing to the buoyancy.