研究目的
To develop and apply a real-time latching controller with wave force prediction to maximize energy absorption in a heaving point-absorber wave energy converter.
研究成果
The developed real-time controller effectively increases energy absorption by over 40% in irregular waves by tuning the velocity phase to align with wave forces. However, prediction deviation negatively impacts control efficiency, and further investigation is needed for high-frequency applications and mechanical integrity.
研究不足
The control efficiency is reduced in the presence of prediction deviation. The controller is less effective in high-frequency waves, and the power output becomes less stable due to intermittent locking, which may affect PTO system integrity.
1：Experimental Design and Method Selection:
The study uses a combination of optimal command theory and the first order-one variable grey model GM(1,1) for real-time control. The control scheme involves predicting wave forces and deducing control actions to maximize energy absorption.
2：Sample Selection and Data Sources:
A heaving point-absorber with a 5m hemisphere floater is modeled. Wave conditions include regular and irregular waves, with parameters such as wave height and period specified.
3：List of Experimental Equipment and Materials:
The setup includes a numerical model of the point-absorber, PTO system modeled as a spring-damper system with specified stiffness and damping coefficients, and simulation tools like the 4th Runge-Kutta method for solving equations.
4：Experimental Procedures and Operational Workflow:
At each time step, wave forces are predicted using GM(1,1), optimal control sequence is deduced using Pontryagin's maximum principle, and the control action is applied. The process is repeated in a receding horizon manner.
5：Data Analysis Methods:
Energy absorption is calculated using integrals of velocity and damping forces. Results are compared with frequency-domain analysis from Wadam software for validation.
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