a “point absorber” system
for water depth from 20m to 50m
another version will be derived
later for deeper horizons
A buoy absorbs the vertical motion of ocean waves. It floats around a column fixed to the seabed, captures and transfers the kinetic energy of the waves to linear electric generators. The modular nature of the system emphasizes safety and reliability, maintenance and performance, as well as survivability in extreme weather.
A 1:20th scaled model of the device has been tested in a wave tank at DGA Hydrodynamics (Rouen, France), confirming previous CFD yield calculation by independant hydrodynamics experts in sea state conditions typical of the french atlantic arc. The load factor can be enhanced further by means of proprietary « latching » system. The new generation of linear generators should improve the performance even more.
Beyond the usual electricity production towards a shore base sub-station, the platform allows the on-site conversion of this energy into “clean hydrogen« for new emerging market applications, particularly in the mobile sector (ground and marine transportation).
Seacap has been thru extensive virtual simulation and tank testing. It is presently studying, within the H2020 EC funded program SeaTitan, a 2nd generation of linear generators to be used on its future WEC’s.
It is now ready to go a step further with an ocean size demonstrator. Various sites have been selected to carry series of experimental real condition on-site production tests.
To this effect Hydrocap is seeking the participation of marine renewable energies interested investors
state of the art
The economic viability of a wave energy converter (WEC) depends largely on its power take-off system (PTO). Active control of the PTO is necessary in order to maximize power capture across the wide range of sea-states encountered offshore and, can also improve survivability.
As developer of an innovative WEC design made of several proven modular components and, ultimately integrator of a complete marine energy WEC, Hydrocap has made its primary goal to design SEACAP around the most reliable and efficient modules, contributing to bring to market a new step change generation of PTO. The economics of the system are directly proportional to the efficiency of the conversion process and the type of generators used (see below).
schematic of energy conversion
After analysis of numerous options, available, or in development, the solution retained by Hydrocap team has been a new type of direct-drive linear azymutal switch-reluctance electric generator.
The second generation is currently developed within SEA-TITAN, a European H2020 funded project started in april 2018, in which Hydrocap is a collaborative partner, together with leading European actors of the electrical and marine energy sector.
The overall objective of SEA-TITAN aims at achieving high and continuous peak force densities, using advanced control strategies, in order to significantly reduce the levelized cost of energy (LCOE) and also the capital expenditures (CAPEX), simultaneously increasing the float to wire efficiency (FtWE), defined as the ratio between the mechanical wave energy absorbed by the system and, the electricity output of the Seacap WEC.