Optimal active control and optimization of a wave energy converter

Edo Abraham, Eric C. Kerrigan

Research output: Contribution to journalArticleScientificpeer-review

67 Citations (Scopus)

Abstract

This paper investigates optimal active control schemes applied to a point absorber wave energy converter within a receding horizon fashion. A variational formulation of the power maximization problem is adapted to solve the optimal control problem. The optimal control method is shown to be of a bang-bang type for a power takeoff mechanism that incorporates both linear dampers and active control elements. We also consider a direct transcription of the optimal control problem as a general nonlinear program. A variation of the projected gradient optimization scheme is formulated and shown to be feasible and computationally inexpensive compared to a standard NLP solver. Since the system model is bilinear and the cost function is not convex quadratic, the resulting optimization problem is not a quadratic program. Results will be compared with an optimal command latching method to demonstrate the improvement in absorbed power. All time domain simulations are generated under irregular sea conditions.

Original languageEnglish
Article number6353624
Pages (from-to)324-332
Number of pages9
JournalIEEE Transactions on Sustainable Energy
Volume4
Issue number2
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Optimal control
  • projected gradient method
  • wave energy

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