Optimal control of wave energy converters

RENEWABLE ENERGY

卷:103

Article

Zou, Shangyan¹  Abdelkhalik, Ossama¹  Robinett, Rush¹  Bacelli, Giorgio²  Wilson, David² 

[1] Michigan Technol Univ, Mech Engn Engn Mech Dept, Houghton, MI 49931 USA

[2] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA

关键词: Wave energy conversion;    Singular arc control;    Optimal control;    Bang-bang control;   

DOI  :  10.1016/j.renene.2016.11.036

来源: Elsevier

【 摘 要 】

Optimal control theory is applied to compute control for a single-degree-of-freedom heave wave energy converter. The goal is to maximize the energy extraction per cycle. Both constrained and unconstrained optimal control problems are presented. Both periodic and non-periodic excitation forces are considered. In contrast to prior work, it is shown that for this non-autonomous system, the optimal control, in general, includes both singular arc and bang-bang modes. Conditions that determine the switching times to/from the singular arc are derived. Simulation results show that the proposed optimal control solution matches the solution obtained using the complex conjugate control. A generic linear dynamic model is used in the simulations. The main advantage of the proposed control is that it finds the optimal control without the need for wave prediction; it only requires the knowledge of the excitation force and its derivatives at the current time. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free