Multi-resonant feedback control of a single degree-of-freedom wave energy converter
US-2018164754-A1 · Jun 14, 2018 · US
Nonlinear controller for nonlinear wave energy converters
US10823134B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10823134-B2 |
| Application number | US-201916534746-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 7, 2019 |
| Priority date | Sep 13, 2018 |
| Publication date | Nov 3, 2020 |
| Grant date | Nov 3, 2020 |
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Abstract
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The present invention is directed to a nonlinear controller for nonlinear wave energy converters (WECs). As an example of the invention, a nonlinear dynamic model is developed for a geometrically right-circular cylinder WEC design for the heave-only motion, or a single degree-of-freedom (DOF). The linear stiffness term is replaced by a nonlinear cubic hardening spring term to demonstrate the performance of a nonlinear WEC as compared to an optimized linear WEC. By exploiting the nonlinear physics in the nonlinear controller, equivalent power and energy capture, as well as simplified operational performance is observed for the nonlinear cubic hardening spring controller when compared to an optimized linear controller.
First claim
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We claim: 1. A nonlinear wave energy converter, comprising: a buoy in a body of water having a wave motion, wherein the waves impacting the buoy exert an excitation force with a plurality of excitation frequencies that causes a buoy motion in a heave direction relative to a reference, an actuator that is configured to apply a control force in the heave direction to the buoy, and a nonlinear feedback controller that computes the control force to be applied by the actuator, wherein the controller comprises a feedback loop comprising a nonlinear cubic spring. 2. The nonlinear wave energy converter of claim 1 , wherein the nonlinear cubic spring comprises a mechanical cubic hardening spring. 3. The nonlinear wave energy converter of claim 1 , wherein the nonlinear cubic spring comprises power electronics that control an energy storage system to match a nonlinear spring effect. 4. The nonlinear wave energy converter of claim 3 , wherein the energy storage system comprises a flywheel, capacitor, or battery. 5. The nonlinear wave energy converter of claim 1 , wherein the nonlinear cubic spring comprises shaping the buoy geometry to produce reactive power from the water. 6. The nonlinear wave energy converter of claim 5 , wherein the buoy comprises as hour-glass mirrored cone.
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in the form of rotational kinetic energy, e.g. in flywheels · CPC title
Energy from the sea, e.g. using wave energy or salinity gradient · CPC title
- F03B13/20Primary
wherein both members {, i.e. wom and rem} are movable relative to the sea bed or shore · CPC title
by power output · CPC title
- F03B13/14Primary
using wave energy · CPC title
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- What does patent US10823134B2 cover?
- The present invention is directed to a nonlinear controller for nonlinear wave energy converters (WECs). As an example of the invention, a nonlinear dynamic model is developed for a geometrically right-circular cylinder WEC design for the heave-only motion, or a single degree-of-freedom (DOF). The linear stiffness term is replaced by a nonlinear cubic hardening spring term to demonstrate the pe…
- Who is the assignee on this patent?
- Nat Tech & Eng Solutions Sandia Llc, Univ Michigan Tech
- What technology area does this patent fall under?
- Primary CPC classification F03B13/20. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Nov 03 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).