Optimal Control for AWS-Based Wave Energy Conversion System

Archimedes wave swing (AWS)-based wave energy conversion (WEC) is the first device adopting the direct-drive power takeoff. The linear permanent magnet generator (LPMG) is employed to convert the wave energy to electric power. In this paper, the power characteristics of the LPMG are discussed in det...

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Bibliographic Details
Published in:IEEE transactions on power systems 2009-11, Vol.24 (4), p.1747-1755
Main Authors: Feng Wu, Xiao Ping Zhang, Ping Ju, Sterling, M.J.H.
Format: Article
Language:English
Subjects:
Archimedes wave swing
control systems
Converters
Damping
Direct power generation
Electric potential
Electric power generation
Energy conversion
Generators
linear synchronous motors
Mechanical variables control
modeling
Motors
Optimal control
permanent magnet generators
Permanent magnets
Power electronics
Power generation
Power system modeling
Resonance
Stiffness
Studies
Voltage
Voltage control
wave energy
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Description
Summary:Archimedes wave swing (AWS)-based wave energy conversion (WEC) is the first device adopting the direct-drive power takeoff. The linear permanent magnet generator (LPMG) is employed to convert the wave energy to electric power. In this paper, the power characteristics of the LPMG are discussed in detail using the model in the dq 0 reference frame established by the authors in a previous work and the forces acting on the translator of the AWS from the LPMG are analyzed. Then based on the two resonance conditions in the dq 0 coordinates, an optimal control strategy for both stiffness and damping, fully using the generator side power electronic converter, is proposed to regulate the AWS in resonance with the wave, so as to extract the maximum power. In contrast to the mechanical resonance regulation approach for stiffness control, the resonance regulation approach for both stiffness and damping control proposed is much easier to implement and much faster. A supplementary DC voltage control for the grid side converter controller is proposed to maintain the voltage level of the DC-Link. Simulations are performed to evaluate the effectiveness of the controllers proposed and to demonstrate the control capability of the controllers under constant waves as well as variable waves.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2009.2030294