Maximising power conversion for heaving point absorbers using a reference-based control technique

Addy Wahyudie; Omsalama Saeed; Mohammed Jama; Hassan Noura; Khalifa Harib

Maximising power conversion for heaving point absorbers using a reference-based control technique

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Author(s): Addy Wahyudie ¹ ; Omsalama Saeed ¹ ; Mohammed Jama ¹ ; Hassan Noura ¹ ; Khalifa Harib ²
- Affiliations: 1: Electrical Engineering Department, United Arab Emirates University (UAE-U), F1 Building, PO Box 15551, UAE ;
  2: Mechanical Engineering Department, UAE-U, F1 Building, PO Box 15551, UAE
Source: Volume 11, Issue 3, 22 February 2017, p. 271 – 280
DOI: 10.1049/iet-rpg.2016.0255 , Print ISSN 1752-1416, Online ISSN 1752-1424

Received 06/04/2016, Accepted 08/09/2016, Revised 06/08/2016, Published 11/09/2016

This study considers maximising conversion between the mechanical and electrical powers for heaving point absorbers (HPAs). The objective is implemented by generating the buoy's velocity reference by designing the intrinsic resistance. The authors designed the intrinsic resistance using a rapid procedure involving the mechanical and electrical models of HPAs. The electrical power conversion can be improved by tuning a weighting constant with the constraints on the maximum value of the control force and the power take-off utilisation index. The value of the intrinsic resistance is varied based on irregular sea states, which are characterised by their significant heights and peak angular frequencies. A simple robust proportional-integral-derivative (PID) controller is utilised in the servo feedback control system to follow the velocity reference. The PID controller is designed using the complex polynomial stabilisation to convert the robust performance into a set of linear programming problems. A set of admissible PID controller is obtained to satisfy the robust performance specifications. The authors tested the proposed method in various nominal and perturbation scenarios, and its performance was compared with existing reference and non-reference based HPA control strategies.

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Maximising power conversion for heaving point absorbers using a reference-based control technique

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