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"Danish Wavestar" a wave energy device that converts the rising and falling movement of the floats to produce electricity.


Danish Wavestar is a wave energy device that converts the rising and falling movement of the floats to produce electricity.

Wavestar A/S, the company behind Wavestar wave energy device, aims to develop a commercial wave energy device that would have the capacity of 600 kW, and would consist of 20 floats, each 5 m in diameter. The device would weigh 1600 t.

The Wavestar device draws energy from wave power with floats that rise and fall with the up and down motion of waves.

The floats are attached by arms to a platform that stands on legs secured to the sea floor.

The motion of the floats is transferred via hydraulics into the rotation of a generator, producing electricity.

The company has installed the test section of the 600 kW machine at Hanstholm, Denmark in 2009. The prototype was made up of 2 floats, and its capacity was 110 KW.

A bridge was built to access the machine, and the device was connected to the grid in February, 2010.

In 2013, Wavestar device was moved to the harbor of Hanstholm in order to expand the device and implement new digital hydraulic system to increase the device’s efficiency, and to add two more floats.

Late in 2014, the company announced that it is testing the new PTO (power take-off) system at Aalborg University, which is expected to increase the efficiency of Wavestar wave energy device.

The Wavestar C6-600kW WEC is designed to deliver maximum 600kW in electrical power to the
grid. This power level is reached at approximately 2.3msignificant wave height. The WEC is planned for unmanned operation with remote data monitoring. TheWEC is considered to be installed at a maximum water depth of 20m including storm surge and is designed to be in operation for a minimum of 20 years. The WEC is equipped with 20 floats, each float having a diameter of 6m. The individual float is mounted on a 12m long steel arm which is hinged on the main tube. 10 arms are placed on each side of the tube. When the waves move a float up and down, power is transferred by a hydraulic cylinder to the Power Take Off (PTO) which produces the power to
the electrical grid. The main tube contains all technological equipment,such as PTO, and the control systems in a dry air environment. This makes it possible to use standard components, which are less expensive than offshore equipment, and still ensure a long life time and minimum maintenance. The main tube is connected to two jacking sections,one at each end. These jacking sections contain the
jacking mechanisms, which can keep the main tube at production level above the sea, and lift the main structure and floats up to a storm protection level, when
necessary.The WEC is designed to produce energy in waveswith a maximum wave height Hmax = 8m which corresponds to a site-specific, significant wave height which is normally close to 4m (i.e. Hmax/2). At higher wave conditions, the floats are automatically lifted outof the water, and the WEC is jacked up to storm protection level. Storm protection involvesun-ballasting the floats and retracting the hydraulic cylinders thereby pulling the floats out of the water.

The electricity production by a single Wavestar C6-600kW placed at Horns Rev 2 is expected
to be 1.4 GWh/year.

Content Courtsey:
4th International Conference on Ocean Energy, 17 October, Dublin
Introduction of Wavestar Wave Energy Converters at the Danish offshore wind power plant Horns Rev 2.

Find out he working videos below:-











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