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External illuminator radar-based blade state monitoring method for wind turbines

An external radiation source radar, wind turbine technology, applied in the direction of using re-radiation, radio wave measurement system, radio wave reflection/re-radiation, etc., can solve the problem of time-consuming and laborious sensor installation and replacement, high wind turbine height, and sensor monitoring range limited issues

Active Publication Date: 2020-01-07
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These are all contact monitoring methods, and the monitoring range of each sensor is limited, and it may be necessary to combine multiple sensors to achieve effective monitoring
Moreover, the height of wind turbines is often high, making the installation and replacement of sensors time-consuming and laborious

Method used

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  • External illuminator radar-based blade state monitoring method for wind turbines
  • External illuminator radar-based blade state monitoring method for wind turbines
  • External illuminator radar-based blade state monitoring method for wind turbines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] This example is a simulation example. An external radiation source radar system is used to monitor the status of two wind turbine blades. The center frequency of the irradiation source signal used in the simulation process is 722MHz, and the coherent accumulation time is set to 6s during the processing process. Other detailed simulation parameters As shown in the table below:

[0073] Table 1 The parameters of the embodiment simulation

[0074]

[0075] Utilize the present invention to monitor the status of wind turbine blades, the basic signal processing flow is as follows figure 2 As shown, it specifically includes the following steps:

[0076] Step 1: Point the reference antenna of the external radiation source radar system to the transmitting station to receive the direct wave signal, point its monitoring antenna to the wind turbine to receive the radar echo signal, and pre-empt the direct wave signal and the radar echo signal. Process and obtain distance spec...

Embodiment 2

[0115] This embodiment verifies the effectiveness of the present invention through field experiments. The external radiation source radar system used in this embodiment uses the terrestrial digital multimedia broadcasting signal (DTMB) as the source of opportunity radiation, the signal center frequency is 722MHz, and the bandwidth is 7.56MHz. The wind turbines used are located in Luoyang, Henan, and there are 10 wind turbines within the radar detection range. Figure 7 is the range-Doppler spectrum of the radar echo. From the figure, we can clearly see the Doppler dimension expansion caused by the micro-Doppler effect of the echo of each wind turbine blade. It shows that the wide-area monitoring of wind turbine blade status by external radiation source radar has great potential. Not generally, this embodiment takes blade condition monitoring of one of the wind turbines as an example to illustrate the specific implementation process of the present invention. The following tab...

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Abstract

The invention discloses an external illuminator radar-based blade state monitoring method for wind turbines. The method comprises the steps of firstly, preprocessing a direct wave signal and a radar echo signal received by an external illuminator radar and obtaining range spectrum data; obtaining the range spectrum data of the wind turbines on a range cell by combining prior information, such as positions of a transceiver station and the wind turbines; carrying out time-domain autocorrelation, FFT transformation and short-time Fourier transformation processing on the data in sequence and obtaining an autocorrelation spectrum, a Doppler spectrum and a time-frequency diagram of blade echoes separately; estimating a rotating speed of the blades according to a spectral peak time interval of the autocorrelation spectrum; estimating orientation of the blade surfaces by using a Doppler expansion frequency of the blade echoes in the Doppler spectrum; and judging the breakage condition of the blades according to the Doppler expansion frequencies of the blades in the time-frequency diagram. The external illuminator radar-based blade state monitoring method for the wind turbines is a wide-area non-contact monitoring method, and multiple parameters of the blades of multiple groups of wind turbines can be monitored at the same time.

Description

technical field [0001] The invention relates to the field of external radiation source radar signal processing and the field of wind power monitoring, in particular to a wind turbine blade state monitoring method based on external radiation source radar. Background technique [0002] As a clean and efficient new energy source, wind power has developed rapidly in recent years. Wind power equipment is often erected in remote areas with harsh environments and is prone to operational failures. Among them, blades are one of the most fault-prone components in wind power equipment, and blade damage repair costs are high and time-consuming. In addition, if the damaged blades are not repaired in time, it will cause unbalanced rotation, which may cause serious secondary damage to the fan system, and even cause the entire fan to collapse. The operation status and structural health of fan blades have received extensive attention. Condition monitoring methods are of great significance....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88G01S7/41
CPCG01S7/41G01S13/88
Inventor 万显荣占伟杰易建新谢德强
Owner WUHAN UNIV
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