Kinetic energy recovery wind-wave integrated system

Patent metadata

Field	Value
Publication number	US-2025172119-A1
Application number	US-202418418361-A
Country	US
Kind code	A1
Filing date	Jan 22, 2024
Priority date	Nov 27, 2023
Publication date	May 29, 2025
Grant date	—

Abstract

This invention introduces a kinetic energy recovery wind-wave integrated system for offshore wind power generation. The system consists of a semi-submersible platform equipped with a fan and an internal wave energy device. The device includes a shell housing a Power Take-Off (PTO) system, featuring a permanent magnet synchronous linear motor and an active controller. The motor's stator is fixed inside the shell, while its mover is connected to a counterweight block outside the stator, linked to the shell's top via a spring. Limiters are installed at both ends of the shell to restrict the counterweight block's movement. This system utilizes the wave energy device to absorb kinetic energy, which otherwise affects wind turbine stability, and converts it into usable electrical energy via the PTO system. This enhances the stability and safety of offshore wind turbine power generation.

First claim

1 . A kinetic energy recovery wind-wave integrated system comprising:
a semi-submersible platform; a fan arranged on the semi-submersible platform; and a wave energy device arranged inside the semi-submersible platform, wherein the wave energy device comprises a shell, wherein an inner part of the shell is equipped with a PTO system, wherein the PTO system comprises a permanent magnet synchronous linear motor and an active controller, wherein the permanent magnet synchronous linear motor comprises:
a stator fixed inside the shell;
a sliding rod provided with at least two counterweight blocks wherein the sliding rod is slidingly connected to the shell through the at least two counterweight blocks: a mover is fixed on the sliding rod such that the mover is rigidly connected to the at least two counterweight blocks disposed outside the permanent magnet synchronous linear motor through the sliding rod, wherein the counterweight block in an upper art of the shell is connected to a top of the shell through a spring and the other counterweight block is connected to the sliding rod in a bottom part of the shell below the permanent magnet synchronous linear motor; and
limiters are set on the top and bottom of the shell to limit the the at least two counterweight blocks, wherein the limiters are controlled by the active controller that is electrically connected to the limiters.

2 . The kinetic energy recovery wind-wave integrated system according to claim 1 , wherein:
the semi-submersible platform comprises at least three pontoon structures and an installation rod wherein each pontoon structure comprises:
a lower pontoon wherein an inner part of the lower pontoon comprises an installation groove for installing the wave energy device;
an upper pontoon disposed on an upper part of the lower pontoon; and
a base disposed towards a bottom portion of the lower pontoon;
the fan is arranged on the installation rod; at least one upper intermediate rod connects each of the upper pontoons of the at least three pontoon structures to an upper part of the installation rod; at least one lower intermediate rod connects a first portion of the base of each of the at least three pontoon structures to a lower part of the installation rod; at least one upper connecting rod connects adjacent upper pontoons of each of the at least three pontoon structures; at least one lower connecting rod connects a second portion of each of the adjacent bases of the at least three pontoon structures; and at least one slant beam connects a lower part of the installation rod to the upper pontoon of each of the at least three pontoon structures.

3 . (canceled)

4 . The kinetic energy recovery wind-wave integrated system according to claim 2 , wherein each pontoon structure comprises a multi-resonance system formed by the at least two counterweight blocks and the shell, wherein,
a mass of the shell and a damping of the shell within water form one set of resonant system, and a damping provided by the at least one counterweight block and a damping of the spring forms another set of resonant system; and the multi-resonance system comprises a plurality of means to obtain a mass of the wave energy device, a force of the shell in water and a force between the PTO system and the shell, wherein the multi-resonance system is configured to provide a measure of the motion of the multi-resonance system as follows:

{

(

M
-
m
+
A

)

⁢

x
¨

outer

=

F
water

-

F
PTO

m
⁢

x
¨

inner

=

F
PTO

}

where M is the mass of the wave energy device, m is a mass of the counterweight block, and A is an additional mass, {umlaut over (x)} inner is a motion acceleration of each of the at least two counterweight blocks, {umlaut over (x)} outer is a motion acceleration of the shell, F water is the force of the shell in the water, and F PTO is the force between the PTO system and the shell.

5 . The kinetic energy recovery wind-wave integrated system according to claim 1 , wherein the system comprises a wave sensor to enable the wave energy device to operate in any one of a working mode and a survival mode; wherein:
the active controller is configured to turn ON the wave energy device to enable the device to operate in the working mode when the wave sensor senses an effective wave height H s of a sea wave, thereby enabling the wave energy device to generate electricity; and the wave energy device is configured to be turned off in the survival mode, such that the permanent magnet synchronous linear motor is shut down and the limiter is started to protect the wave energy device.

6 . The kinetic energy recovery wind-wave integrated system according to claim 5 , wherein the wave energy device is configured to operate in survival mode upon detection of a freak wave, wherein the freak wave is detected by the wave sensor when a maximum wave height H m is two times larger than the effective wave height H s .

Assignees

• Univ South China Tech

Inventors

• Zhou Binzhen
• Huang Xu
• Jin Peng
• Zheng Zhi
• Xiao Yi
• Wang Zedong
• Hu Jianjian
• Zhang Hengming
• Wang Lei
• Yuan Yuming

Classifications

• F03B13/1845

  and the wom slides relative to the rem · CPC title

• B63B1/107

  Semi-submersibles; Small waterline area multiple hull vessels and the like, e.g. SWATH · CPC title

• F03B13/20

  wherein both members {, i.e. wom and rem} are movable relative to the sea bed or shore · CPC title

• F03B13/22 Primary

  using the flow of water resulting from wave movements to drive a motor or turbine {(F03B13/144 takes precedence)} · CPC title

• B63B2035/446

  for converting wind energy into electric energy · CPC title