The progress in wave energy conversion in Europe during the past ten years is reviewed and current activities and initiatives in the wave energy sector at National and Union level are described. Other important activities worldwide are summarized. The technical and econ

/pdf/wave-energy-in-europe-current-status-and-perspectives-29jovj6usk.pdf

Wave energy in Europe: current status and perspectives

1. Introduction 2. Mathematical description of oscillations 3. Interaction between oscillations and waves 4. Gravity waves on water 5. Wave-body interactions 6. Wave-energy absorption by oscillating bodies 7. Wave interactions with oscillating water columns Bibliography Index.

https://assets.cambridge.org/97805217/82111/copyright/9780521782111_copyright.pdf

Ocean waves and oscillating systems : linear interactions including wave-energy extraction

https://hal.archives-ouvertes.fr/hal-00463034/document

Comparison of latching control strategies for a heaving wave energy device in random sea

http://empslocal.ex.ac.uk/people/staff/mm411/documents/LiWeissMuellerTownleyBelmont12pp.pdf

Wave energy converter control by wave prediction and dynamic programming

Aiming at amplifying the energy productive motion of wave energy converters (WECs) in response to irregular sea waves, the strategies of discrete control presented here feature some major advantages over continuous control, which is known to require, for optimal operation, a bidirectional power take-off able to re-inject energy into the WEC system during parts of the oscillation cycles. Three different discrete control strategies are described: latching control, declutching control and the combination of both, which we term latched-operating-declutched control. It is shown that any of these methods can be applied with great benefit, not only to mono-resonant WEC oscillators, but also to bi-resonant and multi-resonant systems. For some of these applications, it is shown how these three discrete control strategies can be optimally defined, either by analytical solution for regular waves, or numerically, by applying the optimal command theory in irregular waves. Applied to a model of a seven degree-of-freedom system (the SEAREV WEC) to estimate its annual production on several production sites, the most efficient of these discrete control strategies was shown to double the energy production, regardless of the resource level of the site, which may be considered as a real breakthrough, rather than a marginal improvement.

https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2011.0132

Discrete control of resonant wave energy devices

Self adaptive control of a piston wave-absorber

An Oscillating Water Column wave-energy device is simulated in a 2D numerical wave tank. The fluid flow modelization is fully nonlinear. A new wave generation by spinning dipole is proposed; when coupled to a robust wave absorption technique, it permits long time simulations without energy accumulation in the tank. The turbine power take off mechanism is driven by a self-adaptive controller. The technique initially developed for active piston wave absorbers is applied successfully to OWC power plants. It is based on a Kalman filter frequency tracking algorithm. This control compares favourably with more conventional open loop systems.

G. Chatry

Papers

Self adaptive control of a piston wave-absorber

Simulation of a Self-Adaptively Controlled OWC In a Nonlinear Numerical Wave Tank