Wave Energy Converter Buoy with Variable Geometry that Improves Energy and Power Capture for Changing Sea States

Document Type

Conference Proceeding

Publication Date



Department of Mechanical Engineering-Engineering Mechanics


This paper presents a nonlinear control design technique that capitalizes on an hour glass (HG) variable geometry wave energy converter (WEC). The HG buoy is assumed to operate in the heave motion of the wave. The unique interaction between the HG buoy and the wave creates a nonlinear cubic storage effect that produces actual energy storage or reactive power during operation. A multi-frequency Bretschneider spectrum wave excitation input is reviewed for the HG design both with constant and varying steepness angle profiles which demonstrates further increased power generation. Numerical simulations are performed to demonstrate the increase in power generation with changing sea states. The objective is to increase the power generation from multi-frequency nonlinear dynamic sources.

Publication Title

2022 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2022