Multi-resonant feedback control of a single degree-of-freedom wave energy converter

Patent · Tue Sep 24 04:00:00 EDT 2019

OSTI ID:1576282

Wilson, David G.; Robinett, III, Rush D.; Abdelkhalik, Ossama; Song, Jiajun; Bacelli, Giorgio

A multi-resonant wide band controller decomposes the wave energy converter control problem into sub-problems; an independent single-frequency controller is used for each sub-problem. Thus, each sub-problem controller can be optimized independently. The feedback control enables actual time-domain realization of multi-frequency complex conjugate control. The feedback strategy requires only measurements of the buoy position and velocity. No knowledge of excitation force, wave measurements, nor wave prediction is needed. As an example, the feedback signal processing can be carried out using Fast Fourier Transform with Hanning windows and optimization of amplitudes and phases. Given that the output signal is decomposed into individual frequencies, the implementation of the control is very simple, yet generates energy similar to the complex conjugate control.

• Research Organization: National Technology & Engineering Solutions of Sandia, LLC, Albuquerque, NM (United States); Michigan Technological Univ., Houghton, MI (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: NA0003525
• Assignee: National Technology & Engineering Solutions of Sandia, LLC (Albuquerque, NM); Michigan Technological University (Houghton, MI)
• Patent Number(s): 10,423,126
• Application Number: 15/830,752
• OSTI ID: 1576282
• Country of Publication: United States
• Language: English