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FEATURE SPONSOR


SPOTLIGHT ON SWEDEN


DEVELOPING THE FUTURE OF WAVEFARM INFRASTRUCTURE


Ocean Harvesting Technologies (OHT) are not your average wave energy technology developer: “We know a lot about wave energy conversion from ten years of development, spanning across the whole system from wave energy converter to grid integration. But what we are focused on is array infrastructure, power take-off and how energy storage technologies can be used in different places in the system to reduce cost without degrading the power capture performance,” explains CEO Mikael Sidenmark.


Flexible power production plant Mikael launched OHT in 2007 to develop a wave energy converter (WEC) with a weight suspended in a winch to smooth power. Today, this gravitational energy storage device is found on a central platform to smooth captured power from an array of WEC´s and


provides short term time shifting and grid storage services. “Our technology turns a wavefarm into a flexible power production plant, capable of revenue stacking from a variety of grid services to the real time market,” Mikael explained.


WORKING TOGETHER


Over the past years, OHT has been working with Sigma Energy and Marine (SEM) on system integration and design for a 10MW demonstration array with hydraulic collection of power from the WEC´s to a central platform. SEM originates from Aker Solutions, offering specialist engineering services for the offshore oil & gas industry.


OHT is also working with Bosch Rexroth on hydraulic systems integrated with the WEC and the collection tower. The radial piston motor technology offered by Bosch Rexroth is key to making this hydraulic link between WEC´s and the central platform viable: “The system design process has helped bring in the right supply chain partners and replace custom solutions with proven technologies, a crucial step in the innovation process to de-risk and reduce cost,” added Mikael.


EXCITING NEW OPTIONS This process has opened up exciting new options for Ocean Harvesting. For example, the storage capacity in the central platform can now be up-scaled considerably as a result of the system design process, Mikael further explained: “We started with an idea of a 70 metre high wind turbine foundation with a 500 ton weight suspended in a custom gear rack inside. We are now using a jack-up platform design with the accumulator mass integrated in a rack leg. Existing jack-up platforms can hold up to 15,000 ton variable load elevated 200 metres above the seabed, which could store 8MWh of energy.”


With the system design phase now completed, the next development stage is to build a 100kW dry test-rig of the central collection platform and gravitational energy storage device. This will be followed by sea trials of a small array of WEC´s connected to the same platform at an offshore test site.


Ocean Harvesting Technologies


www.wavetidalenergynetwork.co.uk


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