Tag Archives: instant force control

InfinityWEC to demonstrate performance with enhanced model-based predictive control in scale 1:3 sea trials

Ocean Harvesting is collaborating with experts in model-based predictive control to implement recent research and increase the performance of InfinityWEC in the upcoming scale 1:3 sea trials.

Use of predictive control strategies in a point-absorbing wave energy converter (WEC) greatly increases the annual energy production (AEP) compared to non-predictive reactive control. OHT has shown up to 30% improvement with model predictive control (MPC) in simulations, and similar results have been shown by other WEC developers and in academic research.

InfinityWEC is unique in its capability to host and benefit from predictive control strategies, designed to provide highly efficient instant force control through a combination of ball screw actuators and hydrostatic pre-tension. Ocean Harvesting is collaborating with leading researchers to implement a new type of controller called a nonlinear moment-based MPC, developed at COER, Maynooth University, Ireland. This controller substantially improves energy output and is fast enough to run on a real-time control system.

Ocean Harvesting is also collaborating with AI experts to implement machine learning techniques which will improve the accuracy of the system model in the controller.

“Following the recent update with hydrostatic pre-tension, reducing the weight of InfinityWEC’s PTO by forty percent, the new controller is another step change in Technology Performance Level, or TPL, and material efficiency,” says CEO Mikael Sidenmark.

During 2023 Ocean Harvesting will implement the new controller and optimize InfinityWEC’s performance through numerical simulations. The controller will then be implemented in a high-fidelity simulation environment, and in the real-time control system in our scale 1:10 PTO test rig, in preparation for the scale 1:3 sea trial project planned to start in January 2024.

Ocean Harvesting is raising 3 MEUR to finance the 1:3 scale sea trial in 2024-25. The project has already received a 2 MEUR grant from the Swedish Energy Agency.