Design and Analysis of a Novel Wave Energy Converter With a Tension Leg Platform and Oscillating Proof Masses
Name
Zhang-nilknarf-meng-eecs-2022-thesis.pdf
Description
Thesis PDF
Size
2.84 MB
Format
Adobe PDF
Checksum (MD5)
c76845a49a9be2d457ebc7e18ef5701d
Author(s)
Zhang, Franklin
Advisor(s)
Sclavounos, Paul
Date Issued
February 2022
Publisher
Massachusetts Institute of Technology
Abstract
A design of novel wave energy converter with an oscillating proof mass and an electromagnetic power takeoff mechanism was considered. The wave energy converter has two parts, a tension leg platform connected by tether lines to the sea floor and inside of it, proof mass oscillators with motions which are coupled to those of the tension leg platform. In order to simplify the analysis, the system was constrained to only oscillate in the direction of surge. Complex hydrodynamic forces caused by ocean waves will excite the system and the surge motion of the proof mass relative to the tension leg platform will generate power via the electromagnetic power takeoff mechanism. First a model of the system with a linear restoring force exerted on the proof mass is analyzed using linear theory. Following the development of the linear theory, a more complex model with a nonlinear restoring force was considered. Using both a frequency-domain approach and a time-domain simulation, the average power of these systems were calculated. To further maximize power, a control circuit and control law are introduced which increase the average power by multiple factors. By introducing nonlinear restoring force and a control law, the performance of the system was shown to be further improved.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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