CN215333257U

CN215333257U - System for monitoring influence of earthquake on vibration of offshore wind turbine

Info

Publication number: CN215333257U
Application number: CN202121875715.3U
Authority: CN
Inventors: 陈建军; 李春晓; 邱旭; 张伟; 刘鑫; 范晓卫
Original assignee: Huaneng Yantai New Energy Co ltd; Huaneng Clean Energy Research Institute
Current assignee: Huaneng Yantai New Energy Co ltd; Huaneng Clean Energy Research Institute
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2021-12-28
Anticipated expiration: 2031-08-11

Abstract

The utility model discloses a system for monitoring the influence of an earthquake on the vibration of an offshore wind turbine, which comprises a submarine seismograph, an accelerometer, a first strain gauge and a second strain gauge; the ocean bottom seismograph is arranged on the ocean bottom of the wind power plant and used for measuring seismic parameters of an offshore wind single field area, and the accelerometer is arranged on the tower barrel and used for measuring the acceleration of the tower barrel; the utility model aims to solve the problem of accuracy of direct reference of the existing national standard because an offshore wind plant is far away from the land, and a submarine seismograph is arranged on the seabed of the wind power plant and is used for accurately monitoring seismic data of an offshore wind single-field area. The wind power generation method based on the optical fiber monitoring has the advantages that wind power data monitored in all weather are compared, dynamic analysis of wind loads and earthquake loads is integrated, influences of different earthquake motions on vibration of the wind power generation method based on the optical fiber monitoring is analyzed, and data support is provided for design and operation and maintenance of the wind power generation method based on the optical fiber monitoring.

Description

System for monitoring influence of earthquake on vibration of offshore wind turbine

Technical Field

The utility model belongs to the technical field of offshore wind power disaster monitoring, and particularly relates to analysis of influences of different seismic vibrations on vibration of an offshore wind turbine.

Background

Offshore wind power is one of the future development directions of the wind power industry, but from the current established and approved offshore wind power projects and future planning, a large proportion of offshore wind power sites are just positioned near the earthquake zone, and potentially have higher risk of earthquake damage. Therefore, the reasonable anti-seismic design is very important for ensuring the safety of the offshore wind power equipment and the supporting structure thereof and avoiding the design cost of the supporting structure from increasing obviously.

The problems that the large-scale development of offshore wind power, part of coastal areas are above earthquake zones, and clear offshore wind power earthquake-resistant design specifications and industry standards are lacked at present are solved. At present, the influence of earthquake on a fan is calculated by generally adopting the onshore GB50011 standard and a simple conversion relation from a II field to other fields III and IV, and the earthquake parameters obtained by adopting the method are inaccurate, so that the problems of design specification and potential safety hazard are caused.

Disclosure of Invention

The utility model provides a system for monitoring the influence of an earthquake on vibration of an offshore wind turbine, which aims to solve the problems of earthquake precision of coastal wind power plant areas and design specification and potential safety hazard caused by inaccurate earthquake parameter quote due to the fact that data quoted directly from the GB50011 range does not include offshore wind power areas.

In order to achieve the above object, the present invention provides a system for monitoring the influence of earthquake on the vibration of an offshore wind turbine, comprising a marine seismograph, an accelerometer, a first strain gauge and a second strain gauge; the ocean bottom seismograph is arranged on the ocean bottom of the wind power plant and used for measuring seismic parameters of an offshore wind single field area, and the accelerometer is arranged on the tower barrel and used for measuring the acceleration of the tower barrel; the first strain gauge is installed on a tower barrel and used for measuring the strain of the tower barrel, and the second strain gauge is installed on the blade and used for measuring the strain of the blade.

Further, the ocean bottom seismograph, the accelerometer, the first strain gauge and the second strain gauge are connected to a data analysis platform, and the data analysis platform is used for analyzing the relation between the seismic parameters and the fan vibration frequency, stress and strain value according to the data collected by the ocean bottom seismograph and the strain gauges.

Further, a plurality of first strain gauges are installed on the tower barrel.

Further, a first strain gauge of the plurality of strain gauges is connected by a sensing cable.

Further, the accelerometer is a fiber grating accelerometer.

Further, a plurality of rows of second strain gauges mounted on the tower are arranged.

Further, the multiple columns of second strain gauges are uniformly arranged.

Further, the wind turbine further comprises a third strain gauge arranged on the wind turbine foundation.

Compared with the prior art, the utility model has at least the following beneficial technical effects:

according to the device, the OBS ocean bottom seismograph is arranged on the sea and used for accurately collecting seismic parameters in a coastal wind power field, and meanwhile, stress and strain monitoring is carried out on a fan foundation and the whole fan through an optical fiber monitoring technology so as to distinguish the influence of different seismic motions on the fan safety.

Furthermore, a plurality of columns of second strain gauges installed on the tower barrel are uniformly arranged, strain in a plurality of directions can be monitored, collected data are more comprehensive, and follow-up analysis is more comprehensive.

Furthermore, the wind turbine further comprises a third strain gauge arranged on the wind turbine foundation, and the strain of the wind turbine foundation can be monitored, so that the strain data on the wind turbine and the tower drum can be supplemented or corrected.

Drawings

FIG. 1 is a diagram of an ocean bottom seismograph and safety monitoring arrangement;

FIG. 2 is a schematic diagram of the arrangement of strain gauges on a tower;

FIG. 3 is a schematic diagram of a comprehensive analysis of seismic loads and wind loads;

FIG. 4 is a flow chart of the integrated analysis system.

In the drawings: 1. the device comprises a submarine seismograph, 21, a first strain gauge, 22, a second strain gauge, 23, a third strain gauge, 3, a sensing optical cable, 4, an accelerometer, 5, blades, 6, a tower, 7 and a fan foundation.

Detailed Description

In order to make the objects and technical solutions of the present invention clearer and easier to understand. The present invention will be described in further detail with reference to the following drawings and examples, wherein the specific examples are provided for illustrative purposes only and are not intended to limit the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The utility model relates to offshore wind power disaster analysis and prevention by coastal area earthquake monitoring and earthquake factors, and fan vibration monitoring and analysis.

The utility model aims to solve the accuracy problem of direct reference of the existing national standard because an offshore wind farm is far away from the land, and a submarine seismograph 1 is arranged on the seabed of a wind farm and is used for accurately monitoring seismic data of an offshore wind single-field area. By comparing fan data monitored by all-weather optical fibers and combining the dynamic analysis of the wind load obtained by a fan system and the actual measurement seismic load of an installed seabed OBS seismograph, the influence of different seismic vibrations on the vibration of the fan is analyzed, and data support is provided for fan design and operation and maintenance. And obtaining the vibration rule of the fan under the result of the coupling action of the earth vibration and the wind motion in the offshore complex environment through the analysis of the earth vibration in different periods.

Referring to fig. 1 and 2, a system for monitoring the influence of earthquake on the vibration of an offshore wind turbine is characterized in that a cable type ocean bottom seismograph 1 is arranged in a wind power area and used for accurately monitoring earthquake parameters of an offshore wind single-field area and simultaneously sending the earthquake parameters to a wind power monitoring system platform. And analyzing the marine seismic monitoring data to obtain the period and frequency analysis result of the seismic data.

The utility model provides a system for be used for monitoring earthquake to offshore wind turbine vibration influence, includes optic fibre safety monitoring system and arranges a seabed OBS seismograph in wind-powered electricity generation region, and optic fibre safety monitoring system and seabed OBS seismograph all are connected to data analysis platform.

The fibre-optic safety monitoring system comprises an accelerometer 4 mounted on a tower 6, a first strain gauge 21 arranged on the tower 6, a second strain gauge 22 arranged on the blade 5 and a third strain gauge 23 on the wind turbine foundation 7, all connected by a sensing cable 3. The first, second and

third strain gauges

21, 22, 23 are used to measure the strain of the tower 6, blade 5 and wind turbine foundation 7, respectively. The accelerometer 4 is used for measuring the acceleration of the tower 6, and transmits the measured acceleration to the data analysis platform through the sensing optical cable 3, and the data analysis platform calculates the vibration frequency and the stress of the tower according to the acceleration.

Referring to fig. 3 and 4, a method of monitoring the effect of an earthquake on offshore wind turbine vibration, comprising the steps of:

measuring acceleration of a tower drum, fan basic strain stress, tower drum strain stress and blade strain stress, a fan basic strain value, a tower drum strain value and a blade strain value by using an optical fiber safety monitoring system; and transmitting to a data analysis platform;

monitoring earthquake parameters in the wind power plant by using a submarine seismograph, and transmitting the earthquake parameters to a data analysis platform;

performing time-lag analysis and data matching on the optical fiber safety monitoring data and the seismic parameters to obtain the correlation between the optical fiber monitoring data and the change of data mutation caused by the earthquake;

according to the change of the optical fiber monitoring data before and after the earthquake, the influence of the earthquake on the vibration of the fan, namely the relation between the earthquake parameter and the vibration frequency stress and strain value of the fan, is obtained.

Vibration and strain data of the fan are obtained through optical fiber monitoring data and a fiber bragg grating accelerometer (or a fan self-contained system), comparative analysis is carried out by combining seismic parameters, and the dynamic characteristics of the fan under the mixed action of earthquake and wind and the amplification effect of the earthquake on the fan vibration are analyzed. And through a long-term actually measured data analysis result, accurate data support is provided for further design of the offshore wind turbine.

Different periodic seismic oscillation is analyzed through long-term collection of seabed seismic data, and data and analysis support are further provided for offshore wind power station seismic design.

Through the comparison of the monitoring data of the ocean bottom seismograph and the real-time optical fiber monitoring data, the correlation of the earthquake to the safety monitoring data of the wind turbine is mined, and particularly the influence of long-period vibration on the offshore wind turbine is mined.

The method requires identifying the time lag between the earthquake measured data and the fan state change, and is used for coupling analysis of the earthquake data and the fan safety monitoring data.

And analyzing the influence of earthquake motion with different frequencies on the state of the fan by comparing the fan state monitoring data under the same wind load with the earthquake-caused monitoring data.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A system for monitoring the effect of an earthquake on offshore wind turbine vibration, comprising a marine seismograph (1), an accelerometer (4), a first strain gauge (21) and a second strain gauge (22); the ocean bottom seismograph (1) is arranged on the ocean bottom of a wind power plant and used for measuring seismic parameters of an offshore wind single field area, and the accelerometer (4) is installed on the tower drum (6) and used for measuring the acceleration of the tower drum (6); the first strain gauge (21) is mounted on the tower (6) and used for measuring the strain of the tower (6), and the second strain gauge (22) is mounted on the blade (5) and used for measuring the strain of the blade (5).

2. A system for monitoring the effect of earthquakes on offshore wind turbine vibrations, according to claim 1, characterized in that the seismometer (1), the accelerometer (4), and the first strain gauge (21) and the second strain gauge (22) are each connected to a data analysis platform for analyzing the relation between seismic parameters and the wind turbine vibration frequency, stress and strain values from the data collected by the seismometer (1), the strain gauges.

3. A system for monitoring the effect of earthquakes on offshore wind turbine vibrations, as set forth in claim 1, characterized in that a plurality of first strain gauges (21) are mounted on the tower (6).

4. A system for monitoring the effect of earthquakes on offshore wind turbine vibrations, according to claim 3, characterized in that a first strain gauge (21) of a plurality of strain gauges is connected by a sensing cable (3).

5. A system for monitoring the effect of earthquakes on offshore wind turbine vibrations, as set forth in claim 3, characterized in that the second strain gauges (22) mounted on the tower (6) are arranged in a plurality of rows.

6. A system for monitoring the effect of earthquakes on offshore wind turbine vibrations, according to claim 5, characterized in that the rows of second strain gauges (22) are arranged uniformly.

7. A system for monitoring the effect of earthquakes on offshore wind turbine vibrations, according to claim 1, characterized in that the accelerometer (4) is a fiber grating accelerometer.

8. A system for monitoring the effect of earthquakes on offshore wind turbine vibrations, according to claim 1, characterized in that it further comprises a third strain gauge (23) mounted on the wind turbine foundation (7).