Model predictive control of sea wave energy converters - Part I: A convex approach for the case of a single device

RENEWABLE ENERGY

卷:69

Article

Li, Guang¹  Belmont, Michael R.² 

[1] Univ London, Sch Engn & Mat Sci, London E1 4NS, England

[2] Univ Exeter, Coll Engn Math & Phys Sci, Exeter EX4 4QF, Devon, England

关键词: Wave energy;    Model predictive control;    Quadratic programming;   

DOI  :  10.1016/j.renene.2014.03.070

来源: Elsevier

【 摘 要 】

This paper investigates model predictive control (MPC) of a single sea wave energy converter (WEC). By using control schemes which constrain certain quantities, such as the maximum size of the feedback force, the energy storage for actuators and relative heave motion, it is possible for control to not only improve performance but to directly impact strongly on design and cost. Motivated by this fact, a novel objective function is adopted in the MPC design, which brings obvious benefits: First, the quadratic program (QP) derived from this objective function can be easily convexified, which facilitates the employment of existing efficient optimization algorithms. Second, this novel design can trade off the energy extraction, the energy consumed by the actuator and safe operation. Moreover, an alternative QP is also formulated with the input slew rate as optimization variable, so that the slew rate limit of an actuator can be explicitly incorporated into optimization. All these benefits promote the real-time application of MPC on a WEC and reduced cost of hardware. (C) 2014 Elsevier Ltd. All rights reserved.

【 授权许可】

Free