Wave excitation force estimation of wave energy floats using extended Kalman filters

OCEAN ENGINEERING

卷:198

Article

Davis, Andrew F.^1,2  Fabien, Brian C.² 

[1] LeTourneau Univ, Dept Mech Engn, Longview, TX 75602 USA

[2] Univ Washington, Dept Mech Engn, Seattle, WA 98195 USA

关键词: Wave energy converter;    Nonlinear model;    Excitation force;    Estimation;    Extended Kalman filter;   

DOI  :  10.1016/j.oceaneng.2020.106970

来源: Elsevier

【 摘 要 】

In many advanced control strategies the wave excitation force is key to determining the control input. However, it is often difficult to measure the excitation force on a Wave Energy Converter (WEC). The use of Kalman filters to estimate the wave excitation force based on readily available measurement data can potentially fill the gap between the development of WEC control strategies and the data that is available. Two different estimation methods using an nonlinear Extended Kalman Filter are tested on experimental wave tank data for a heaving semi-submerged float. The first method relies on directly including the excitation force as a state in the first order dynamics-which allows the random walk of the Kalman filter to identify an estimate of the excitation force. The second method of estimation involves modeling the wave excitation force as a harmonic oscillator comprised of sinusoidal components. Both methods are evaluated for a variety of incident waves and additional sensitivity analyses are performed to investigate the susceptibility of these estimation methods to changes in the model, measurement noise, and sampling rate.

【 授权许可】

Free