专利汇可以提供INDIVIDUAL BLADE NOISE MEASUREMENT SYSTEM AND METHOD FOR WIND TURBINES专利检索,专利查询,专利分析的服务。并且A method for configuring blades of a wind turbine for low noise generation. The method includes providing at least one noise measuring device. The noise measuring device is arranged and disposed in a position to measure noise of the blades during rotation. The wind turbine is configured to include a rotational trigger, the rotational trigger being arranged to provide a signal at a predetermined rotational position of the wind turbine blades. One or more of the blades is configured with an aerodynamic modifying device. Noise level is measured with the noise measuring device during wind turbine operation. The noise produced by each of the blades is determined. The blades are configured in response to the noise determined for each of the blades. A method for measuring the noise level generated by an individual blade and a wind turbine configured for desired noise level are also disclosed.,下面是INDIVIDUAL BLADE NOISE MEASUREMENT SYSTEM AND METHOD FOR WIND TURBINES专利的具体信息内容。
The present invention is directed to methods for installing and/or configuring wind turbines. In particular, the present invention is directed to measuring, analyzing and configuring wind turbines for operation based upon noise level generated by the wind turbine blades.
Recently, wind turbines have received increased attention as environmentally safe and relatively inexpensive alternative energy sources. With this growing interest, considerable efforts have been made to develop wind turbines that are reliable and efficient.
Generally, a wind turbine includes a rotor having multiple blades. The rotor is mounted to a housing or nacelle, which is positioned on top of a truss or tubular tower. Utility grade wind turbines (i.e., wind turbines designed to provide electrical power to a utility grid) can have large rotors (e.g., 30 or more meters in length). In addition, the wind turbines are typically mounted on towers that are at least 60 meters in height. Blades on these rotors transform wind energy into a rotational torque or force that drives one or more generators. As the blades are rotated by the wind, noise is inherently generated.
International standards exist to measure noise level produced by wind turbines. The existing system and standards measure an overall noise level produced by the wind turbine, typically from a fixed point. This overall noise level is utilized to configure the wind turbine with noise reduction equipment. Configuring of wind turbine blades for noise levels requires long and costly steps including outfitting of the blades, evaluating the blade set over a testing period wherein the process is then repeated for new blade arrangement. Such steps require multiple iterations, each iteration requires rigging of all of the blades. The rigging of these blades may require lifting equipment, personnel and time. Wind turbine blades and associated equipment may be large or heavy, requiring specialized equipment that is expensive to operate. Further, wind turbines may be installed on uneven terrain and/or on very high towers (e.g., towers that are at least 60 meters in height) that are inaccessible to mobile land-based cranes. The installation, servicing and configuration may be very expensive and time consuming.
What is needed is a method and system for configuring and/or analyzing wind turbine blade noise level that permits configuration of the wind turbine and provides individual blade noise levels for configuration and operation of the wind turbine, wherein the process does not require the expensive and labor-intensive processes of the known noise level measurement and configuration systems.
One aspect of the present invention includes a method for configuring blades of a wind turbine for low noise level generation. The method includes providing at least one noise measuring device. The noise measuring device is arranged and disposed in a position to measure noise of the blades during rotation. The wind turbine is configured to include a rotational trigger, the rotational trigger being arranged to provide a signal at a predetermined rotational position of the wind turbine blades. One or more of the blades is configured with an aerodynamic modifying device. Noise level is measured with the noise measuring device during wind turbine operation. The noise level produced by each of the blades is determined. The blades are configured in response to the noise level determined for each of the blades.
Another aspect of the present disclosure includes a method for determining the noise level generated by a wind turbine blade. The method includes providing at least one noise measuring device and arranging and disposing the noise measuring device in a position to measure noise level of the blades during rotation. The wind turbine is configured to include a rotational trigger, the rotational trigger being arranged to provide a signal at a predetermined rotational position. Noise level is measured with the noise measuring device during wind turbine operation. Time between signals generated by the rotational trigger is measured. The noise level measured by the noise measuring device is correlated to the time between signals to determine the noise level generated by each blade during operation. The noise level produced by each of the blades is thereby determined.
Still another aspect of the present disclosure includes a wind turbine configured for desired noise production. The wind turbine includes a plurality of wind turbine blades. In addition, a rotational trigger is arranged and disposed to provide a signal at a predetermined rotational position of the blades. Each of the blades is individually configured for noise reduction and the configuration including one or more the blades having aerodynamic modification devices, the arrangement of the aerodynamic modification devices is determined in response to noise level measured on each individual blade.
Advantages to an embodiment of the disclosure include the ability for different noise reduction measures to be tested simultaneously at one turbine. In addition, the noise measurement and analysis procedure permit the determination of individual noise level and noise level spectra of wind turbine blades.
The ability to measure noise level at individual blades allows time and cost reduction due to fewer measurements, crane actions and reduced blade preparation. Furthermore, the method of the present disclosure has lower uncertainty and greater noise level measurement detail than standard International Standard measurements.
The method also allows consistent and reliable noise level measurements at various dissimilar locations substantially independent of the environmental and site conditions.
Other features and advantages of the present invention will be apparent from the following more detailed description of the preferred embodiment, taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the invention.
Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
As shown in
As the individual blade 108 noise level measurements are determinable by the noise-measuring device 209 correlated to blade position between rotational trigger activations, these magnitudes may be compared to determine the blade 108 and the blade configuration that is creating, for example, the greatest amount of noise.
At least one of the blades 108, preferably two, are removed from the wind turbine and outfitted with noise reduction devices, step 613. Noise reduction devices may include, but are not limited to aerodynamic modification devices. Aerodynamic modification devices may be arranged and disposed on the blades 108. In other embodiments, blades 108 configured with differing aerodynamic profiles (e.g., varied airfoil geometries) may also be substituted for the blades 108 to determine the noise generated. The aerodynamic modification devices may include, but are not limited to turbulator holes, zig-zag (ZZ) turbulator tape, stall strips, vortex generators, Gurney flaps, acoustical flaps, any combinations thereof, or any other device or configuration capable of manipulating the aeorodynamic flow over the blade 108. The arrangement of noise reduction devices selected may be based on any criteria. For example, the arrangement may be a random arrangement, a preselected arrangement or an arrangement in response to historical data of configurations for a particular wind turbine or environment. Noise level is measured as a function of power, rpm and/or pitch of the blades 108, step 615. The noise level is then averaged against stable operating conditions to determine the absolute noise level and optimum noise levels for the individual blades, step 615. The data obtained in compared for each blade with respect to each other, step 615. The data is analyzed to determine the stability of the data and to determine whether the stability is sufficient to determine the absolute noise level desired by the individual blades 108, step 615. Thereafter, a determination is made whether all of the desired combinations of configurations of blades has been measured, step 617. If the combinations are insufficient, the blades 108 are reconfigured and the measurements are continued in step 615. However, if all of the combinations have been measured and recorded, the noise levels desired are determined and the configuration associated with the desired noise level is determined, step 619. While not so limited, the desired noise levels may be a minimum amount of noise, may be a noise level established by local ordinance or statute, or may be an optimal noise level with respect to cost or turbine efficiency. The blades 108 are provided with the configuration associated with the desired noise level and the wind turbine is permitted to operate, step 621.
In order to determine the optimal configurations of noise reduction devices, the present method of measuring noise level permits the analyzing of many different wind turbine parameters, including, but not limited to wind speed, turbine output, rpm, pitch of the blades 108 or a variety of other wind turbine parameters. For example,
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.
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