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A wind turbine blade condition monitoring method based on external radiation source radar

A technology of external radiation source radar and wind turbines, which is applied in the field of external radiation source radar signal processing and wind power monitoring, and can solve the problems of limited sensor monitoring range, high wind turbine height, time-consuming and laborious installation and replacement of sensors, etc.

Active Publication Date: 2021-09-03
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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  • A wind turbine blade condition monitoring method based on external radiation source radar
  • A wind turbine blade condition monitoring method based on external radiation source radar
  • A wind turbine blade condition monitoring method based on external radiation source radar

Examples

Experimental program
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Effect test

Embodiment 1

[0072] This embodiment is an embodiment simulated using a passive radar system for monitoring the state of two wind turbine blades, the simulation process of the illumination source signal center frequency used is 722MHz, the process of the coherent accumulation time is set to 6s, other detailed simulation parameters following table:

[0073] The simulation parameters of Table 1 Embodiment

[0074]

[0075] With the present invention the state monitoring wind turbine blade, as the basic signal processing flow figure 2 As shown in particular comprising the steps of:

[0076] Step 1: Reference antennas of the radiation source radar system point to the transmitting station, used to receive direct reach signal, monitor the antenna to point to the wind turbine, for receiving radar echo signals, pre-passing the direct wave signal and radar echo signal Processing, getting distance spectrum data;

[0077] In this embodiment the direct wave signal is a signal free of echo wind turbine bl...

Embodiment 2

[0115] This embodiment verifies the effectiveness of the present invention by an external field experiment. The external radiation source radar system used in this embodiment is a ground digital multimedia broadcast signal (DTMB) as an opportunity to illuminate the source, the signal center frequency is 722 MHz, with a bandwidth of 7.56 MHz. The wind turbines used are located in Luoyang, Henan, and there are 10 wind turbines in the range of radar detection. Figure 7 For the distance of the radar echo, Dopplerian exhibition caused by Micro Doppler effects of various windmill unit blade echoes can be clearly seen from the figure. Note Wide area monitoring of wind turbine blade status by using an external radiation source has great potential. Insure, the present embodiment is described as an example of the blade state monitoring of one of the wind and electromechanics, and the specific implementation flow of the present invention will be described. The following table gives the prior...

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Abstract

The invention discloses a state monitoring method for wind turbine blades based on external radiation source radar. Firstly, the direct wave signal and radar echo signal received by the external radiation source radar are preprocessed to obtain the distance spectrum data, and then combined with the prior information such as the transceiver station and the location of the wind turbine, the distance spectrum data of the distance unit where the wind turbine is located is obtained; The data is processed by time-domain autocorrelation, FFT transform and short-time Fourier transform in turn, and the autocorrelation spectrum, Doppler spectrum and time-frequency diagram of the leaf echo are obtained respectively; The rotation speed is estimated by using the Doppler extension frequency of the blade echo in the Doppler spectrum, and the blade damage is judged according to the Doppler extension frequency of each blade in the time-frequency diagram. The invention is a wide-area, non-contact monitoring means, which can monitor multiple parameters of the blades of multiple groups of wind turbines at the same time.

Description

Technical field [0001] The present invention relates to radar signal processing and monitoring of electrical field radiation outside air, particularly to a blade wind turbine condition monitoring method based on passive radar. Background technique [0002] Wind power as a clean and efficient new energy in recent years, rapid development. Wind power equipment are often set up in the harsh environment in remote areas, prone to operational failure. Among them, the blades of wind power equipment is one of the components most prone to failure, and higher leaf damage repair costs, time-consuming. In addition, if the injury leaves do not get timely maintenance, will cause rotation of the imbalance may cause serious secondary damage to the fan system, and even lead to the collapse of the entire fan. Operational status and structure of the fan blades of health received extensive attention, Effective fan blades condition monitoring method is important. [0003] Currently, usually collected...

Claims

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Application Information

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Patent Type & Authority Patents(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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