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Title: Multiresonant Feedback Control of a Three-Degree-of-Freedom Wave Energy Converter

Journal Article · · IEEE Transactions on Sustainable Energy
 [1];  [1];  [1];  [2];  [2];  [2];  [1]
  1. Michigan Technological Univ., Houghton, MI (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
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For a three-degree-of-freedom wave energy converter (heave, pitch, and surge), the equations of motion could be coupled depending on the buoy shape. This paper presents a multiresonant feedback control, in a general framework, for this type of a wave energy converter that is modeled by linear time invariant dynamic systems. The proposed control strategy finds the optimal control in the sense that it computes the control based on the complex conjugate criteria. This control strategy is relatively easy to implement since it is a feedback control in the time domain that requires only measurements of the buoy motion. Numerical tests are presented for two different buoy shapes: a sphere and a cylinder. Regular, Bretschnieder, and Ochi-Hubble waves are tested. Simulation results show that the proposed controller harvests energy in the pitch-surge-heave modes that is about three times the energy that can be harvested using a heave-only device. In conclusion, this multiresonant control can also be used to shift the energy harvesting between the coupled modes, which can be exploited to eliminate one of the actuators while maintaining about the same level of energy harvesting.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1492375
Report Number(s):
SAND-2018-12236J; 669145
Journal Information:
IEEE Transactions on Sustainable Energy, Vol. 8, Issue 4; ISSN 1949-3029
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

Cited By (3)

Control of Three Degrees-of-Freedom Wave Energy Converters Using Pseudo-Spectral Methods journal January 2018
A Flower Pollination Method Based Global Maximum Power Point Tracking Strategy for Point-Absorbing Type Wave Energy Converters journal April 2019
Extending Complex Conjugate Control to Nonlinear Wave Energy Converters journal January 2020

Figures / Tables (13)

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Related Subjects

42 ENGINEERING
multi resonant control
three degrees of freedom WEC
wave energy conversion