CN114151292A

CN114151292A - On-line monitoring system and method for foundation scouring of offshore wind generating set

Info

Publication number: CN114151292A
Application number: CN202111432712.7A
Authority: CN
Inventors: 林鹏; 王鑫; 刘溟江; 刘鑫; 黄浩东; 陈道想; 姚中原; 张宇; 胡皓; 邱旭
Original assignee: Huaneng Yancheng Dafeng New Energy Power Generation Co ltd; Tsinghua University; Huaneng Clean Energy Research Institute
Current assignee: Huaneng Yancheng Dafeng New Energy Power Generation Co ltd; Tsinghua University; Huaneng Clean Energy Research Institute
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-03-08

Abstract

The invention relates to an offshore wind generating set foundation scouring on-line monitoring system and a method thereof, wherein the system comprises: the low-frequency vibration sensors are arranged at the bottom of the fan tower cylinder and used for acquiring monitoring data at the installation positions of the fan tower cylinder; the information acquisition and storage unit is used for storing the monitoring data and uploading the monitoring data to the state information management terminal; the state information management terminal is used for storing design parameter information corresponding to each fan foundation, determining output information according to the design parameter information and the monitoring data, and outputting the output information to the cloud server; and the cloud server is used for outputting the corresponding basic state report to the appointed user terminal according to the output information.

Description

On-line monitoring system and method for foundation scouring of offshore wind generating set

Technical Field

The disclosure relates to the technical field of wind power plant monitoring, in particular to an offshore wind turbine generator system foundation scouring online monitoring system and method.

Background

In various foundation forms commonly used in offshore wind power plants at present, single-pile foundations are most widely applied. The installation of the single-pile foundation changes the local water-sand environment of the seabed, so that the original sand balance around the foundation is damaged, and the sand around the foundation is started and transported to form a scouring pit. The larger scouring pit can reduce the burial depth of the foundation, the overall rigidity of the fan structure is correspondingly reduced, on one hand, the bearing capacity of the foundation is reduced, and on the other hand, the reduction of the structural rigidity can cause the vibration frequency of the foundation to be close to the vibration frequency of the fan to induce structural resonance; and at the same time, the submarine cable buried in the seabed around the foundation can be exposed, and the fatigue load borne by the submarine cable is increased. Therefore, the foundation scour seriously threatens the safe operation of the offshore wind farm, and once the foundation is damaged, the foundation is greatly damaged, so that the economic loss is caused.

At present, a method for monitoring foundation scouring of an offshore wind turbine mainly depends on a ship-borne multi-beam sounding system, sails on a specified measuring line by using a window period sea, forms strip-type high-density water depth data in a vertical plane perpendicular to sailing through wide-angle directional transmitting and receiving of sound waves, can accurately map and draw submarine topography in a strip band with a certain width along a course line, and visually judges scouring conditions around the foundation through a submarine topography map.

The prior art has the following defects:

(1) the shipborne multi-beam sounding method has high requirement on operation conditions and high sea-going cost, and needs to rely on the sea-going in a window period for operation, the requirement on the sea-going operation can not be met frequently due to severe marine weather conditions, and meanwhile, the most serious scouring often occurs in extreme weather, and the actual maximum scouring depth of a site can not be measured by the method.

(2) The ship-borne multi-beam sounding method has the advantages that a flight path is limited by operation time and submarine topography, and measurement operation cannot be carried out on the foundation scouring condition of a wind turbine of the whole offshore wind farm;

(3) the multi-beam sounding system needs to transmit and receive sound waves underwater, is very easy to lose effectiveness due to seawater corrosion, has high difficulty in long-term operation and maintenance if being installed on site, and is high in cost and lack of economy.

Disclosure of Invention

In order to overcome the problems in the related art, the invention provides an offshore wind turbine generator system foundation scouring on-line monitoring system and method, which improve the traditional discontinuous scouring monitoring mode, can monitor the scouring state around the foundation continuously in real time and feed back the health state of the foundation.

According to a first aspect of the embodiments of the present disclosure, an offshore wind turbine generator system foundation scouring online monitoring system is provided, the system includes:

the low-frequency vibration sensors are arranged at the bottom of the fan tower cylinder and used for acquiring monitoring data at the installation positions of the fan tower cylinder;

the information acquisition and storage unit is used for storing the monitoring data and uploading the monitoring data to the state information management terminal;

the state information management terminal is used for storing design parameter information corresponding to each fan foundation, determining output information according to the design parameter information and the monitoring data, and outputting the output information to the cloud server;

and the cloud server is used for outputting the corresponding basic state report to the appointed user terminal according to the output information.

In one embodiment, preferably, the state information management terminal is specifically configured to:

calculating to obtain a control element of each fan foundation according to the design parameter information, and setting the control element as an early warning value, wherein the early warning value comprises the maximum scouring depth allowed by the pile foundation and the minimum natural frequency allowed by the fan;

calculating to obtain real-time natural frequency of the fan structure and basic scouring depth of the fan according to the monitoring data;

comparing the real-time inherent frequency of the fan structure and the basic scouring depth of the fan with the early warning value to obtain a comparison result;

and determining and outputting corresponding output information according to the comparison result.

In one embodiment, preferably, the monitoring data comprises acceleration data;

the design parameter information comprises a fan structure parameter, a machine position geological parameter, a machine position environmental parameter and a fan operation information parameter;

the output information comprises a basic flushing state and a basic safety state of the fan;

the basic scouring state comprises normal basic scouring and serious basic scouring, and the basic safety state comprises basic safety and basic danger.

In one embodiment, preferably, calculating the real-time natural frequency of the wind turbine structure and the base scouring depth of the wind turbine according to the monitoring data includes:

calculating the time domain to the frequency domain of the design parameter information through fast Fourier transform, and determining the natural frequency of the fan structure according to a frequency domain calculation structure;

establishing a correlation between the natural frequency of the fan structure and the basic scouring depth of the fan through simulation analysis, wherein a correlation formula comprises the following steps:

S(t)＝a[bf(t)]+c

s (t) represents the basic scouring depth of the fan, f (t) represents the natural frequency of the fan structure, and a, b and c are influence parameters determined by different fan structure parameters and determined through simulation calculation.

In an embodiment, preferably, the cloud server is specifically configured to:

when the output information is normal flushing based on the basic information and the basic information is safe, outputting a corresponding first basic state report and prompting the user that no measures need to be taken;

when the output information is basic and the scour is serious and the foundation is dangerous, outputting a corresponding second basic state report, and prompting a user to measure the basic terrain by recently going to the sea so as to determine whether basic protective measures are needed;

when the output information is normal flushing based on basic danger, outputting a corresponding third basic state report, prompting a user to stop the machine for maintenance, and determining whether the flushing causes the basic protective measures or not;

and when the output information is basic and the flushing is serious and the foundation is dangerous, outputting a corresponding fourth basic state report and prompting a user to adopt basic protection measures recently.

According to a second aspect of embodiments of the present disclosure, there is provided an offshore wind turbine generator system base scour online monitoring method employing the offshore wind turbine generator system base scour online monitoring system according to any one of the embodiments of the first aspect, the method comprising:

acquiring monitoring data of the installation position of the low-frequency vibration sensor through the plurality of low-frequency vibration sensors, wherein the plurality of low-frequency vibration sensors are installed at the bottom of the fan tower cylinder;

storing the monitoring data;

storing design parameter information corresponding to each fan foundation, and determining output information according to the design parameter information and the monitoring data;

and outputting the corresponding basic state report to the appointed user terminal according to the output information.

In one embodiment, preferably, storing design parameter information corresponding to each wind turbine foundation, and determining output information according to the design parameter information and the monitoring data includes:

In one embodiment, preferably, the monitoring data comprises acceleration data;

S(t)＝a[bf(t)]+c

In one embodiment, preferably, outputting the corresponding basic status report to the specified ue according to the output information includes:

According to a third aspect of embodiments of the present disclosure, there is provided a computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement the steps of the method according to any one of the embodiments of the second aspect.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

the method establishes the correlation between the inherent frequency of the structure and the scouring depth, utilizes the high-precision low-frequency vibration sensor to acquire the low-frequency vibration signal of the single-pile foundation of the offshore wind generating set in real time, and filters and analyzes the data through the signal acquisition and algorithm unit to realize the real-time monitoring and early warning of the scouring state and the safety state of the single-pile foundation of the offshore wind generating set. Therefore, the traditional discontinuous scouring monitoring mode is improved, the scouring state around the foundation can be continuously monitored in real time, and the health state of the foundation can be fed back. The system is different from the traditional scouring monitoring mode, can be installed above the water surface, has good sensor durability and can ensure long-term operation on the sea. Meanwhile, the system is low in cost, the installation position is not limited, the system can be popularized and used in the whole wind power plant, and data support is provided for intelligent management of the wind power plant.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a block diagram illustrating an offshore wind turbine foundation scour online monitoring system according to an exemplary embodiment.

FIG. 2 is a schematic diagram of a sensor arrangement shown in accordance with an exemplary embodiment.

FIG. 3 is a frequency-time domain diagram illustrating monitoring data according to an example embodiment.

FIG. 4 is a frequency domain plot of the mechanism frequency after fast Fourier transform of the monitored data, according to an exemplary embodiment.

FIG. 5 is a graphical illustration of a correlation of a natural frequency of a wind turbine structure to a base wash depth of the wind turbine, according to an exemplary embodiment.

FIG. 6 is a flowchart illustrating an offshore wind turbine foundation scour online monitoring method according to an exemplary embodiment.

Fig. 7 is a specific flowchart illustrating an offshore wind turbine foundation scour online monitoring method according to an exemplary embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

As shown in fig. 1, according to a first aspect of the embodiments of the present disclosure, there is provided an offshore wind turbine generator system foundation scour online monitoring system, the system including:

the low-frequency vibration sensors 11 are mounted at the bottom of the fan tower and used for acquiring monitoring data at the mounting positions of the fan tower; by using the low-frequency vibration measuring sensor, the acceleration a in the X-axis direction and the Y-axis direction at the installation position of the sensor can be measured_x、a_y. Wherein, the schematic diagram of the sensor arrangement is shown in fig. 2.

The information acquisition and storage unit 12 is used for storing the monitoring data and uploading the monitoring data to the state information management terminal;

the state information management terminal 13 is configured to store design parameter information corresponding to each fan base, determine output information according to the design parameter information and the monitoring data, and output the output information to a cloud server;

the cloud server 14 is configured to output a corresponding basic status report to a specified user terminal according to the output information.

The basic scouring monitoring system comprises a low-frequency vibration sensor, an information acquisition and storage unit, a state information management computer, a cloud server and a user side. The information acquisition and storage unit acquires, processes and stores data in real time through a low-frequency vibration sensor arranged at the bottom of the fan tower drum, and transmits the data to a state information management and calculation terminal to analyze and diagnose the data; the data are remotely uploaded to a cloud server through an offshore wind farm local area network, and the cloud server manages the data and appoints and pushes early warning information to relevant users; the user can check historical data in a database of the cloud server, or can make a decision on whether the offshore wind power foundation needs reinforcement or not based on report contents when a basic security status report appointed to be pushed by the cloud server is received. The system uses a wind field power supply, is provided with a standby power supply and a power-off restarting system to adapt to a severe marine operating environment.

In one embodiment, preferably, the state information management terminal 13 is specifically configured to:

In one embodiment, preferably, the monitoring data comprises acceleration data;

calculating the time domain to the frequency domain of the design parameter information through fast Fourier transform, as shown in fig. 3 and 4, and determining the natural frequency of the fan structure according to a frequency domain calculation structure;

the correlation between the natural frequency of the fan structure and the basic scouring depth of the fan is established through simulation analysis, and as shown in fig. 5, a correlation formula comprises:

S(t)＝a[bf(t)]+c

In an embodiment, preferably, the cloud server 14 is specifically configured to:

As shown in fig. 6, according to a second aspect of the embodiments of the present disclosure, there is provided an offshore wind turbine generator system base scour online monitoring method using the offshore wind turbine generator system base scour online monitoring system according to any one of the embodiments of the first aspect, the method including:

step S601, acquiring monitoring data of the installation position of a plurality of low-frequency vibration sensors, wherein the low-frequency vibration sensors are installed at the bottom of a fan tower cylinder;

step S602, the monitoring data is stored through an information acquisition and storage unit and uploaded to a state information management and calculation terminal;

step S603, storing design parameter information corresponding to each fan foundation, and determining output information according to the design parameter information and the monitoring data;

step S604, outputting the corresponding basic state report to the appointed user terminal according to the output information.

Specifically, as shown in fig. 7, in an embodiment, preferably, the storing design parameter information corresponding to each wind turbine foundation, and determining output information according to the design parameter information and the monitoring data includes:

comparing the real-time inherent frequency of the fan structure and the basic scouring depth of the fan with the early warning value to obtain a comparison result; namely, whether the basic scouring is normal or not is judged, and whether the foundation is in a safe state or not is judged;

In one embodiment, preferably, the monitoring data comprises acceleration data;

S(t)＝a[bf(t)]+c

It is further understood that the use of "a plurality" in this disclosure means two or more, as other terms are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.

It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An offshore wind turbine foundation scouring on-line monitoring system, characterized in that the system comprises:

2. The system of claim 1, wherein the state information management terminal is specifically configured to:

3. The system of claim 1, wherein the monitoring data comprises acceleration data;

4. The system of claim 3, wherein calculating real-time natural frequency of the wind turbine structure and base scour depth of the wind turbine from the monitored data comprises:

S(t)＝a[bf(t)]+c

5. The system of claim 4, wherein the cloud server is specifically configured to:

6. An on-line monitoring method for foundation scouring of an offshore wind generating set, which is characterized by comprising the following steps:

storing the monitoring data;

7. The method of claim 6, wherein storing design parameter information corresponding to each wind turbine foundation and determining output information based on the design parameter information and the monitoring data comprises:

8. The method of claim 6, wherein the monitoring data comprises acceleration data;

9. The method of claim 8, wherein calculating real-time natural frequency of the wind turbine structure and base wash depth of the wind turbine from the monitored data comprises:

S(t)＝a[bf(t)]+c

10. The method of claim 9, wherein outputting the corresponding basic status report to the specified ue according to the output information comprises: