A distributed measurement system and method for high synchronization accuracy of wind turbines

Abstract

The present invention provides a high-synchronization-precision distributed measurement system and method for wind turbines. Compared with expensive foreign distributed synchronous measurement systems for wind turbines based on field bus protocol transmission, the present invention is a new type of high-precision distributed measurement system with simple structure and low price. By recording a unique timestamp and redundant transmission of collected data, and eliminating redundant data in the background of the server, it ensures that the measurement data of each position of the unit is obtained under a unique and identical timestamp, thereby realizing high-synchronization-precision distributed measurement of the wind turbine, reducing the cost of all-round and full-coverage status monitoring of the wind turbine, and facilitating the promotion of comprehensive status monitoring of the unit.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and relates to a distributed measurement system and method for a wind turbine with high synchronization accuracy. Background Art

[0002] Wind turbines operate in harsh conditions, and the reliability of the equipment severely restricts the availability and power generation of wind turbines. Online monitoring of the operating status of wind turbines can timely detect abnormal operation of the equipment and provide early warning, so that preventive maintenance can effectively improve the operating efficiency of wind turbines.

[0003] At present, the transmission chain vibration monitoring system (CMS) has been widely used in wind turbines, but the condition monitoring of key equipment at various positions of the wind turbine and the overall operation status analysis and evaluation methods need to be improved. Establishing a distributed measurement system with high synchronization accuracy for wind turbines is the basic condition for overall analysis and evaluation. Only by obtaining synchronous measurement data at different positions of the unit can we combine the unit's operating status and the measurement data at various positions for comprehensive analysis and evaluation. There are distributed synchronous measurement systems for wind turbines abroad, which generally use fieldbus communication and are expensive. They are generally used for formal experiments and tests of wind turbine prototypes, which seriously restricts the promotion and application of comprehensive condition monitoring of wind turbines and comprehensive analysis and evaluation technology of the unit's operating status. Summary of the invention

[0004] The purpose of the present invention is to provide a distributed measurement system and method for wind turbines with high synchronization accuracy, which solves the problem that the existing online monitoring of the operating status of wind turbines cannot reflect the operating status of the entire unit and cannot timely discover the safety risks of the unit during the operation stage.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The present invention provides a high-synchronization-precision distributed measurement system for a wind turbine, comprising a server, wherein the server is connected to a plurality of data acquisition modules, wherein the plurality of data acquisition modules are respectively a high-frequency acquisition module in a hub, a high-frequency acquisition module in a cabin, a high-frequency data acquisition module at a tower top, and a high-frequency data acquisition module at a tower bottom, wherein the high-frequency acquisition module in the hub is used to acquire blade root load strain data, blade vibration data, and hub posture data, and packages the acquired data with a time tag; the high-frequency acquisition module in the cabin is used to acquire cabin vibration data and operation data in a unit control system, and packages the acquired data with a time tag; the high-frequency data acquisition module at the tower top is used to acquire tower top load strain data and tower top inclination data, and packages the acquired data with a time tag; the high-frequency data acquisition module at the tower bottom is used to acquire tower bottom load strain data and tower bottom dynamic inclination data, and packages the acquired data with a time tag; the server is used to screen and filter the received data according to the time tag, and store the processed data.

[0007] Preferably, the input end of the high-frequency acquisition module in the wheel hub is respectively connected to the first strain sensor, the first vibration sensor and the first attitude sensor; wherein the first strain sensor is placed at the root of the blade to collect load strain data information at the root of the blade; the first vibration sensor is placed at 1 / 3 of the blade to collect vibration data of the blade; the first attitude sensor is placed in the wheel hub to collect attitude data of the hub.

[0008] Preferably, the input end of the high-frequency acquisition module in the cabin is respectively connected to the biaxial vibration sensor and the IO card in the cabin control cabinet; the biaxial vibration sensor is arranged on the unit tower to collect the vibration data of the cabin; the IO card in the cabin control cabinet is arranged in the cabin control cabinet to collect the operation data of the unit control system.

[0009] Preferably, the input end of the tower top high-frequency data acquisition module is respectively connected to the second strain sensor and the first inclination sensor; wherein the second strain sensor is arranged on the tower top to collect the load strain data of the tower top; the first inclination sensor is arranged on the tower top to collect the inclination data of the tower top.

[0010] Preferably, the input end of the tower bottom high-frequency data acquisition module is respectively connected to a third strain sensor and a second inclination sensor; wherein the third strain sensor is arranged at the bottom of the tower to collect load strain data of the tower bottom; and the second inclination sensor is arranged at the bottom of the tower to collect inclination data of the tower bottom.

[0011] Preferably, the high-frequency data acquisition module in the hub, the high-frequency data acquisition module in the cabin, the high-frequency data acquisition module on the tower top and the high-frequency data acquisition module on the tower bottom are all connected to the server via a switch in the unit.

[0012] Preferably, the high-frequency acquisition module in the wheel hub is wirelessly connected to the switch in the unit via a wireless data receiving module in the cabin.

[0013] Preferably, the high-frequency data acquisition module in the hub, the high-frequency data acquisition module in the nacelle, the high-frequency data acquisition module on the tower top and the high-frequency data acquisition module on the tower bottom are all connected to a high-precision time synchronization module master station.

[0014] Preferably, the high-frequency acquisition module in the wheel hub is wirelessly connected to the high-precision time synchronization module master station via a high-precision time synchronization module slave station.

[0015] A distributed measurement method for wind turbines with high synchronization accuracy, based on the distributed measurement system for wind turbines with high synchronization accuracy, comprises the following steps:

[0016] The data acquisition module obtains the current standard time, wherein if the format of the current standard time is correct, the error value between the current standard time and the system time in the current data acquisition module is calculated, and if the error value is within a preset range, the system time in the data acquisition module is set to the current standard time, otherwise, the system time in the data acquisition module remains unchanged; if the format of the current standard time is incorrect, or the current standard time is not received within the preset time, the system time in the data acquisition module remains unchanged;

[0017] The multiple data acquisition modules respectively collect the measurement data of sensors placed on the hub, nacelle, tower top and tower bottom of the wind turbine and the operation data of the turbine in real time, and pack the collected data with the system time of the data acquisition module with a timestamp label to obtain a data packet;

[0018] Afterwards, the obtained data packets are transmitted to the server using HTTP protocol according to the set time interval and redundant time amount;

[0019] Afterwards, the server screens and filters each received data packet according to the unique timestamp label to ensure that there is only one set of valid measurement data under the same timestamp label;

[0020] Finally, the processed data packets are stored

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides a high-synchronization-precision distributed measurement system and method for wind turbines. Compared with expensive foreign distributed synchronous measurement systems for wind turbines based on field bus protocol transmission, the present invention is a new type of high-precision distributed measurement system with simple structure and low price. By recording a unique timestamp and redundant transmission of collected data, and eliminating redundant data in the background of the server, it ensures that the measurement data of each position of the unit is obtained under a unique and identical timestamp, thereby realizing high-synchronization-precision distributed measurement of the wind turbine, reducing the cost of all-round and full-coverage status monitoring of the wind turbine, and facilitating the promotion of comprehensive status monitoring of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the system composition and connection of the present invention;

[0024] Figure 2 is a flow chart of the method of the present invention;

[0025] Among them, 1. High-frequency data acquisition module in the hub 2. High-precision time synchronization module slave station 3. Attitude sensor in the hub 4. Load strain sensor at the root of the blade 5. Vibration sensor at 1 / 3 of the blade 6. High-frequency acquisition module in the cabin 7. Biaxial vibration sensor on the tower 8. High-precision time synchronization module master station 9. Wireless data receiving module in the cabin 10. IO card in the cabin control cabinet 11. High-frequency data acquisition module at the top of the tower 12. Load strain sensor at the top of the tower 13. Dynamic inclination sensor at the top of the tower 14. High-frequency data acquisition module at the bottom of the tower 15. Load strain sensor at the bottom of the tower 16. Dynamic inclination sensor at the bottom of the tower 17. Switch in the unit 18. Data storage and analysis server at the station end DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] like Figure 1 As shown, the present invention provides a distributed measurement system for wind turbines with high synchronization accuracy, including multiple high-frequency data acquisition modules, a high-precision time synchronization module 2, multiple attitude sensors, multiple strain sensors, multiple vibration sensors, a wireless data receiving module, a cabin control cabinet IO card 10, a switch 17 and a server 18 in the unit, wherein the multiple high-frequency data acquisition modules are respectively arranged at the hub, the cabin, the tower top, the tower bottom and other key positions required for measurement or connected to the unit's own control system.

[0028] The multiple high-frequency data acquisition modules all adopt an embedded system developed based on FPGA, the system platform is LINUX, and the program development language is JAVA.

[0029] Specifically, the multiple high-frequency data acquisition modules are a high-frequency data acquisition module 1 in the hub, a high-frequency data acquisition module 6 in the nacelle, a tower top high-frequency data acquisition module 11 and a tower bottom high-frequency data acquisition module 14 .

[0030] The input end of the high-frequency acquisition module 1 in the hub is respectively connected to the first strain sensor 4, the first vibration sensor 5 and the first attitude sensor 3; and is used to collect blade root load strain data, blade vibration data and impeller azimuth at a millisecond rate.

[0031] The first strain sensor 4 is placed at the root of the blade and is used to collect load strain data information of the root of the blade.

[0032] The first vibration sensor is placed at 1 / 3 of the blade and is used to collect vibration data of the blade.

[0033] The first attitude sensor 3 is placed in the wheel hub and is used to collect impeller azimuth angle data.

[0034] The high-frequency acquisition module 1 in the wheel hub is respectively connected to the high-precision time synchronization module slave station 2 and the wireless data receiving module 9 in the cabin, wherein the high-precision time synchronization module slave station 2 is connected to the high-precision time synchronization module master station 8 by wireless means; the wireless data receiving module 9 in the cabin is connected to the switch 17 in the unit by wireless means.

[0035] The input end of the high-frequency acquisition module 6 in the cabin is respectively connected to the biaxial vibration sensor 7, the cabin control cabinet IO card 10, and the wind speed and direction recorder 19 arranged on the top of the cabin, and is used to collect cabin vibration data, operation data in the unit control system, and wind speed and direction data outside the cabin at a millisecond rate.

[0036] The biaxial vibration sensor 7 is arranged on the cabin bracket and is used to collect bidirectional vibration data of the cabin.

[0037] The cabin control cabinet IO card 10 is arranged in the cabin control cabinet and is used to collect the operating data of the unit control system.

[0038] The input end of the tower top high frequency data acquisition module 11 is respectively connected to the second strain sensor 12 and the first inclination sensor 13, and is used to acquire the tower top load strain data and the tower top inclination data at a millisecond rate.

[0039] The second strain sensor 12 is arranged on the tower top to collect load strain data of the tower top.

[0040] The first inclination sensor 13 is arranged on the tower top and is used to collect inclination data of the tower top.

[0041] The input end of the tower bottom high-frequency data acquisition module 14 is respectively connected to the third strain sensor 15 and the second inclination sensor 16 for acquiring load strain data and dynamic inclination data of the tower bottom at a millisecond rate.

[0042] The third strain sensor 15 is arranged at the bottom of the tower to collect load strain data of the bottom of the tower.

[0043] The second inclination sensor 16 is arranged at the bottom of the tower and is used to collect inclination data of the bottom of the tower.

[0044] The high-frequency data acquisition module 6 in the cabin, the high-frequency data acquisition module 11 at the top of the tower and the high-frequency data acquisition module 14 at the bottom of the tower are also connected to a high-precision time synchronization module master station 8 .

[0045] Among them, the high-precision time synchronization module master station 8 is arranged in the cabin, and is used to obtain standard time through the communication network, and transmit the acquired standard time to the high-precision time synchronization module slave station 2 wirelessly at a set fixed time interval, and at the same time transmit it to the high-frequency acquisition module 6 in the cabin, the tower top high-frequency data acquisition module 11 and the tower bottom high-frequency data acquisition module 14 at a set fixed time interval through RS485 cable and serial port.

[0046] The high-precision time synchronization module slave station 2 is arranged at the wheel hub; it is used to transmit the standard time to the wheel hub high-frequency data acquisition module 1 at a set fixed time interval through the RS485 cable and serial port.

[0047] The high-frequency data acquisition module 1 in the hub, the high-frequency data acquisition module 6 in the cabin, the high-frequency data acquisition module 11 at the top of the tower, and the high-frequency data acquisition module 14 at the bottom of the tower are all connected to the switch 17 in the unit; the output end of the switch 17 in the unit is connected to the server 18 arranged at the station end.

[0048] The server 18 is used to store the received data, filter the received data according to the time tag, and then analyze the processed unit measurement data and operation data.

[0049] like Figure 2 As shown, the workflow is:

[0050] The high-precision time synchronization module master station 8 deployed in the cabin regularly obtains the current standard time through the communication network or satellite timing method. If the signal is normal and the time can be obtained, the standard time is transmitted wirelessly at a set fixed time interval through the high-precision time synchronization module slave station 2 located at the hub to the high-frequency acquisition module 1 in the hub; at the same time, the standard time is transmitted to the high-frequency acquisition module 6 in the cabin, the high-frequency data acquisition module 11 at the top of the tower and the high-frequency data acquisition module 14 at the bottom of the tower through the RS485 cable and serial port at a set fixed time interval. If the signal time cannot be obtained due to signal reasons, a non-standard time format is output, indicating that the standard time cannot be obtained due to signal reasons.

[0051] The standard time source of the high-precision time synchronization module master station can be in the form of communication network timing such as CMDA, 4G, or in the form of satellite timing such as GPS, Beidou, etc.

[0052] The high-frequency data acquisition frequency is greater than or equal to 50 Hz.

[0053] After the high-precision data acquisition module receives the system time of the time synchronization module, if it is in a normal time format, it will compare the system time of the acquisition module. When the error between the received standard time and its own system time is within the set range, its own system time will be set to the received standard time; when the error between the received standard time and its own system time is outside the set range, an alarm will be issued; when the received time information is in an abnormal standard time format, it will be recorded. If the valid standard time cannot be received within the set time length, an alarm will be issued.

[0054] The setting range of time error is less than or equal to 5ms.

[0055] The plurality of high-frequency data acquisition modules at the wind turbine end respectively collect the measurement data of the wind turbine hub, nacelle, tower top and tower bottom sensors and the unit operation data in real time at a rate of milliseconds, and package the collected data within a set time period together with the system time tag of the collection module, and respectively adopt wireless sending and receiving mode and wired connection mode, and use HTTP protocol to actively upload the data packets to the server 18 at the set time interval.

[0056] The wind turbine segment high-frequency data acquisition module performs high-frequency data acquisition by setting the data acquisition frequency by itself; by setting the data upload time interval T and the redundant time Δt, the data collected within the time period [(t-1)*T-Δt, t*T+Δt] is collected, where t is the time period number for data upload, and the time length of each uploaded data packet is (T+2Δt,) to prevent data loss that may occur at the connection position of adjacent data packets.

[0057] The server 18 is used to receive data packets uploaded by multiple high-frequency data acquisition modules, filter them from each data packet according to a unified time tag, extract all measurement data and unit operation data under the same time tag, and store them in a relational database, so as to provide a data basis for subsequent comprehensive data analysis and evaluation of the unit operation status and prompt abnormal operation status of the unit.

[0058] The above description is only a preferred guiding implementation mode of the present invention, and the protection scope of the present invention is not limited thereto. Any replacement of the parts of the three main units that can be easily thought of by any technician familiar with the technical field within the technical scope of the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A distributed measurement method for wind turbines with high synchronization accuracy, characterized in that: A distributed measurement system for wind turbines with high synchronization accuracy comprises a server, the server being connected to a plurality of data acquisition modules, the plurality of data acquisition modules being respectively a hub high-frequency acquisition module (1), a cabin high-frequency acquisition module (6), a tower top high-frequency data acquisition module (11) and a tower bottom high-frequency data acquisition module (14), wherein the hub high-frequency acquisition module (1) is used to acquire blade root load strain data, blade vibration data and hub attitude data, and packages the acquired data with a time tag; the cabin high-frequency acquisition module (6) is used to acquire cabin vibration data and operation data in a unit control system, and packages the acquired data with a time tag; the tower top high-frequency data acquisition module (11) is used to acquire tower top load strain data and tower top inclination data, and packages the acquired data with a time tag; the tower bottom high-frequency data acquisition module (14) is used to acquire tower bottom load strain data and tower bottom dynamic inclination data, and packages the acquired data with a time tag; the server is used to screen and filter the received data according to the time tag, and store the processed data; The input end of the high-frequency acquisition module (1) in the wheel hub is respectively connected to a first strain sensor (4), a first vibration sensor (5) and a first attitude sensor (3); wherein the first strain sensor (4) is placed at the root of the blade and is used to collect load strain data information at the root of the blade; the first vibration sensor is placed at 1 / 3 of the blade and is used to collect vibration data of the blade; the first attitude sensor (3) is placed in the wheel hub and is used to collect attitude data of the wheel hub; The input end of the high-frequency acquisition module (6) in the cabin is respectively connected to the biaxial vibration sensor (7) and the IO card in the cabin control cabinet; the biaxial vibration sensor (7) is arranged on the unit tower and is used to collect vibration data of the cabin; the IO card in the cabin control cabinet is arranged in the cabin control cabinet and is used to collect operation data of the unit control system; The input end of the tower top high-frequency data acquisition module (11) is respectively connected to a second strain sensor (12) and a first inclination sensor (13); wherein the second strain sensor is arranged on the tower top and is used to collect load strain data of the tower top; and the first inclination sensor is arranged on the tower top and is used to collect inclination data of the tower top; The input end of the tower bottom high-frequency data acquisition module (14) is respectively connected to a third strain sensor (15) and a second inclination sensor (16); wherein the third strain sensor (15) is arranged at the tower bottom and is used to collect load strain data of the tower bottom; and the second inclination sensor is arranged at the tower bottom and is used to collect inclination data of the tower bottom; The method comprises the following steps: The data acquisition module obtains the current standard time, wherein if the format of the current standard time is correct, the error value between the current standard time and the system time in the current data acquisition module is calculated, and if the error value is within a preset range, the system time in the data acquisition module is set to the current standard time, otherwise, the system time in the data acquisition module remains unchanged; if the format of the current standard time is incorrect, or the current standard time is not received within the preset time, the system time in the data acquisition module remains unchanged; The multiple data acquisition modules respectively collect the measurement data of sensors placed on the hub, nacelle, tower top and tower bottom of the wind turbine and the operation data of the turbine in real time, and pack the collected data with the system time of the data acquisition module with a timestamp label to obtain a data packet; Afterwards, the obtained data packets are transmitted to the server using HTTP protocol according to the set time interval and redundant time amount; Afterwards, the server screens and filters each received data packet according to the unique timestamp label to ensure that there is only one set of valid measurement data under the same timestamp label; Finally, the processed data packets are stored.

2. A distributed measurement method for wind turbines with high synchronization accuracy according to claim 1, characterized in that: The hub internal high-frequency data acquisition module (1), the cabin internal high-frequency data acquisition module (6), the tower top high-frequency data acquisition module (11), and the tower bottom high-frequency data acquisition module (14) are all connected to the server (18) via an internal switch (17) of the unit.

3. A distributed measurement method for wind turbines with high synchronization accuracy according to claim 2, characterized in that: The high-frequency acquisition module (1) in the wheel hub is wirelessly connected to the switch (17) in the unit via a wireless data receiving module (9) in the cabin.

4. A distributed measurement method for wind turbines with high synchronization accuracy according to claim 1, characterized in that: The hub internal high-frequency acquisition module (1), the cabin internal high-frequency acquisition module (6), the tower top high-frequency data acquisition module (11) and the tower bottom high-frequency data acquisition module (14) are all connected to a high-precision time synchronization module master station (8).

5. A distributed measurement method for wind turbines with high synchronization accuracy according to claim 4, characterized in that: The high-frequency acquisition module (1) in the wheel hub is wirelessly connected to the high-precision time synchronization module master station (8) via the high-precision time synchronization module slave station (2).

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