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INTERFACE MODULE FOR A TETHERED WIND TURBINE TOWER

IP.com Disclosure Number: IPCOM000248830D
Publication Date: 2017-Jan-16
Document File: 12 page(s) / 81K

Publishing Venue

The IP.com Prior Art Database

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 12% of the total text.

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INTERFACE MODULE FOR A TETHERED WIND TURBINE TOWER

FIELD OF THE INVENTION

The present invention relates to an interface module for a wind turbine tower wherein

the tower is tethered by a number of cables extending between anchoring elements 5

on anchor blocks and the interface module at the tower.

BACKGROUND OF THE INVENTION

A traditional tower for a wind turbine is a tubular steel tower with tower sections

placed on top of each other fixed to a concrete foundation. Due to transport and 10

production restrictions, the external diameter has a limited size. Therefore, often the

shell thickness is seen as the primary dimensioning parameter when increasing the

tower height.

Simply increasing the tower shell thickness is however a very ineffective way of 15

achieving increased bearing capacity and stiffness as these parameters only grow

linear with the shell thickness. In comparison, increasing the diameter of the tower

yields an increased bearing capacity with the diameter in the power of two, and a

stiffness growing with the diameter in three.

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To overcome such size limitation problem different solutions have been used. For

instance, the bearing capacity of a tower such as a wind turbine tower can be

increased and the stresses reduced in parts of the tower by installing a number of

cables or wires from a number of anchors or foundations to attachment points on the

tower. The cables may provide stability to the tower to reduce oscillations from wind 25

and may reduce the loads in the part of the tower below the cables considerably.

This so-called guyed or tethered tower will to some extent be de-loaded by the wire

reactions and may thereby potentially be constructed by fewer long sections with a

relatively smaller and thereby more transportable diameters.

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Typically the wires are equally spaced around the tower, with one of their ends being

attached to the tower, via e.g. eyes in plates mounted to the tower, and the other

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ends to anchor blocks at ground level. In e.g. US4266911 a separate ring is

mounted around and movable along the tower and the wires may be mounted.

It is an object of the present invention to provide improvements to tethered wind

turbine towers.5

SUMMARY OF THE INVENTION

The invention relates to a tower section for a tethered tower, such as a tethered wind

turbine tower. The tower section has a generally cylindrical wall and extends in a

longitudinal direction along and about a central longitudinal axis from a lower end to 10

an upper end of said tower section. The tower section comprises a plurality of tubes

distributed around the central longitudinal axis, and each of the plurality of tubes has

a generally cylindrical shape and extends through the cylindrical wall from an inner

tube end on an inner side of the cylindrical wall to an outer tube end on an outer side

of the cylindrical wall. Further, each of the plurality of tubes has a tube center line, 15

and each of the plurality of tubes is adapted for receiving a ca...