WaveRoller - Panel Moves and Absorbs
The back and forth movement of water driven by wave surge puts the WaveRoller panel into motion. To maximize the energy that the WaveRoller panel can absorb from the waves, the device is installed underwater at depths of approximately 8 – 20 meters, where the wave surge is most powerful. A single panel absorbs 1.5-2 MW of power from the wave surge. The panel spans essentially the entire depth of the water column from the seabed up to the water surface level.
Details
As the WaveRoller panel moves and absorbs the energy from ocean waves, hydraulic piston pumps attached to the panel pump hydraulic fluids inside a closed hydraulic circuit. All the elements of the hydraulic circuit are enclosed inside a hermetic structure inside the device and are not exposed to the marine environment. Consequently, there is no risk of leakage into the ocean. The high-pressure fluids are fed into a power storage and smoothing system, which connects to a hydraulic motor that drives an electricity generator. The electrical output from this renewable wave energy power plant is then connected to the electric grid via a subsea cable.
The WaveRoller technology provides three unique empirically validated benefits:
- It is installed and operating in the nearshore area – easy access to site, protected from extreme conditions and minimized balance of plant infrastructure cost
- It captures power with a bottom fixed panel (oscillating wave surge converter) – highly efficient power capture, can operate in low-, mid- and high-sea states with no cut-off and with only one moving part
- It converts movement to electricity using an onboard power storage and hydraulic system – smooth and grid-compatible power output, ability to establish and support grid and low maintenance design with inverters on shore.
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