AU2005206866B2 – Active Impedance Matching Systems And Methods For Wave Energy Converter – Google Patents

20 According to a sixth aspect of the invention, there is provided a combination comprising a wave energy converter (WEC) having two elements intended to be placed in a body of water, the two elements being able to move relative to each other in response to forces applied to the WEC by the body of water; a power take off device (PTO) connected between the two elements, the 25 PTO being responsive to movement between the two elements to extract energy from the WEC and produce an output voltage and current which is a function of the relative movement between the two elements; and the PTO including means for sensing and determining selected ones of the displacement, velocity and acceleration of one of the two elements relative to the other for selectively and 30 actively supplying a force to the one of the two elements moving relative to the other, the PTO force being generated by a combination of a generator/motor and a four-quadrant power converter for controlling the current to/from the generator/motor, and a controller for continuously producing set-point signal commands to the four-quadrant power converter for driving the PTO to exert a 35 force between the two elements which is a function of at least one of (i) the relative position and speed of the two elements; and (ii) the relative acceleration and speed of the two elements.

Tratamiento para dolor de espalda baja - YouTube The above references to and descriptions of prior proposals or 20 products are not intended to be, and are not to be construed as, statements or admissions of common general knowledge in the art in Australia, SUMMARY OF THE INVENTION According to a first aspect of the invention, there is provided A combination comprising a wave energy converter (WEC) having two elements 25 intended to be placed in a body of water, the two elements being able to move relative to each other in response to forces applied to the WEC by the body of water; at least one of the two elements being a wave energy absorber; and means connected between the two elements for extracting energy from the WEC and for producing output electric energy as a function of the relative movement 30 between the two elements; and means connected between a source of energy and one of the two elements for sensing and determining selected ones of the displacement, velocity and acceleration of one of two elements relative to the other for selectively and actively supplying energy to one of the two elements for causing an increase in the displacement and velocity of one of the two elements 35 relative to the other, whereby the net amount of output electrical energy produced is increased.

Dolor Neuropático Central

3 According to a second aspect of the invention, there is provided a combination comprising a wave energy converter (WEC) having two elements intended to be placed in a body of water, the two elements being able to move relative to each other in response to forces applied to the WEC by the body of 5 water; at least one of the two elements being a wave energy absorber; a power take off device (PTO) connected between the two elements, the PTO being responsive to movement between the two elements to produce electric energy; said PTO being characterized in that it can also cause movement of one of the two elements relative to the other; and means connected between a source of 10 electric energy and the PTO including means for sensing and determining the displacement and velocity of one of the two elements relative to the other and, based on predetermined criteria, for selectively and actively supplying power to the PTO for causing the PTO to impart energy to one of the two elements for selectively causing an increase in the velocity of said one of the two elements in 15 order to increase the net power produced by the PTO.

As detailed below, for one condition of signals, power absorbed by the shell 5 drives the linear to rotary translator 103, 104, 105 and causes motor/generator 206 to function as a generator producing a desired electrical output voltage and current which is coupled via the 4-quadrant power converter in module 201 to supply an output load 110, which for ease of description is shown as a resistor, but which could be a complex load, as shown in the other figures. DETAILED DESCRIPTION OF THE INVENTION Figure 4 illustrates a system embodying the invention in which a WEC shell 5 is coupled to a power-take-off device (PTO) 170 at whose output is produced the desired electrical energy extracted from the WEC. In systems making use of a generator/motor device, at times, the generator functions as a load on the buoy (WEC) extracting energy from it, while at other times it expends energy and functions as a motor applying a force (and energy) to the buoy.

Maroa Portrait According to a fourth aspect of the invention, there is provided a method 30 for increasing the efficiency of a wave energy converter WEC in the production of an electric output where the WEC includes two elements intended to be placed in a body of water, the two elements being able to move relative to each other in response to forces applied to the WEC by the body of water; comprising the steps of sensing the displacement of one of the two elements as it moves up and 35 down relative to a null position; determining the speed of one of the two elements as it moves up and down relative to the null position; determining when the 3a speed of the one of the two elements is at or close to zero; and selectively and actively supplying power to one of the two elements for increasing its speed and displacement and thereby increasing the power generated by the WEC.

In systems embodying the invention a PTO coupled between the shell and shaft may be a generator (or an equivalent mechanical or hydraulic device) for converting the energy available from the WEC into electrical energy. Applicants’ invention resides, in part, in the use of apparatus and methods for increasing the displacement and velocity (and the acceleration) of the shell to increase the power available from the WEC and the electric output from its PTO. Applicants’ invention also includes a method to control the electrical load of the electrical generator driven by the WEC so as to match the impedance of the WEC load to the input so as to maximize conversion efficiency and power output. 4 or 5) for controlling when and how the motor 203 is driven. It also includes the selection of appropriate system signals (e.g., displacement, velocity, acceleration) to determine when and how energy should be supplied to the WEC-shell.

  • Uso de anticonceptivos orales
  • Ejercicios y estiramientos para el dolor en el cuello
  • Sus semillas son venenosas si se ingieren
  • Ease of deployment
  • Quality and Safety Monitoring

To begin with, there is a problem in converting wave energy to usable mechanical motion and force. Although energy is expended to move the shell, the movement is such that there is a significant net gain in the power generated by the WEC. In addition, there is a further problem of converting the mechanical energy into electrical energy in an efficient manner. Patent 6,731,019, based on Application Serial Number 09/922877 filed 8/6101 titled “Apparatus and Method for Optimizing the Power Transfer Produced by a Wave Energy Converter (WEC)” assigned to the assignee of the present 5 application and the teachings of which are incorporated herein by reference. This includes a computer based system to determine when the energy should be supplied to best achieve the desired results. According to one aspect of the invention, the displacement and the velocity of the WEC are increased by selectively applying energy to the WEC 10 WO 2005/069824 PCT/US2005/001100 during portions of a wave cycle.

3; Figures 4 through 6 illustrate various systems and methods to ‘tune’ the mechanical properties of a WEC for optimizing the extraction of energy from ocean waves, in accordance with the invention; 25 6 WO 2005/069824 PCT/US2005/001100 Figures 7A, 7B and 7C illustrate key elements of AIMS systems used to practice the invention; Figure 8 is a block diagram of an AIMS control system used to practice the invention; Figure 9 is a diagram depicting the functions performed by a 4-quadrant power converter used in practicing the invention; Figure 10 is a diagram of a portion of the electronics of a power converter; Figures 11 and 11A are highly simplified block diagrams of a system embodying the invention where the power take off device (PTO) is a linear electric generator (LEG); Figure 12 is a diagram of idealized waveforms associated with the operation of a WEC, with “strong” restoring positional forces, in accordance with the invention and in comparison to the prior art; and Figure 13 is a diagram of idealized waveforms associated with the operation of a WEC, with “weak” restoring positional forces, in accordance with the invention and in comparison to the prior art.