Unlock instant, AI-driven research and patent intelligence for your innovation.

Cabin type wind lidar adaptive beam scanning method

A technology of wind measurement laser radar and beam scanning, which is applied in the direction of ICT adaptation, measurement equipment, radio wave measurement system, etc., can solve the problems that affect the efficiency of radar measurement data and the inability to measure effective data.

Active Publication Date: 2019-09-13
NANJING MOVELASER TECH CO LTD
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the existing scheme, the lidar beam will be blocked by the fan impeller during emission, resulting in invalid data and affecting the effectiveness of radar measurement data
When the rotation speed of the fan just satisfies the multiple relationship with the beam switching period, one or more beams will be completely blocked, and no valid data can be measured

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cabin type wind lidar adaptive beam scanning method
  • Cabin type wind lidar adaptive beam scanning method
  • Cabin type wind lidar adaptive beam scanning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Embodiment 1: A nacelle-type wind-measuring lidar adaptive beam scanning method:

[0092] In the embodiment, the number of light beams is 2, and in this embodiment, the shading position is predicted based on the fan speed.

[0093] S1. Radar signal processing steps: Obtain the laser radar return light signal CNR, and the method for obtaining the laser radar return light signal CNR is:

[0094]

[0095] In the formula, S(f) is the signal power spectrum after noise elimination, and N(f) is the background noise power spectrum;

[0096] S2. Impeller occlusion detection step: judge whether the impeller is occluded based on the laser radar return light signal CNR. Before the impeller occlusion detection, store the CNR in chronological order as follows:

[0097] Beam 1

[0098] t 0.02 1.02 2.02 3.02 4.02 5.02 6.02 7.02 8.02 9.02 10.02 CNR 5.30 0.94 4.78 0.80 6.14 0.60 7.13 0.42 5.17 0.2 4.26

[0099] Beam 2

[0100] t 0....

Embodiment 2

[0132] Embodiment 2: A nacelle-type wind-measuring lidar adaptive beam scanning method:

[0133] In the embodiment, the number of light beams is 2, and in this embodiment, the occlusion position is predicted based on the radar CNR.

[0134] S1, the radar signal processing steps are exactly the same as in Embodiment 1;

[0135] S2, the impeller blocking detection step is exactly the same as that of Embodiment 1;

[0136] S3. Blocking position prediction steps:

[0137] In Example 2, the main control of the fan does not provide the fan speed M, at this time γ 1 =0; Predict the occlusion position according to CNR:

[0138] a) Parameter initialization

[0139] According to the number of beams 2, the next period is divided into 2 equal parts, and the occlusion weight w of the first beam is initialized 1j =0, 1≤j≤2; w 1jIndicates the occlusion weight of the first beam in the jth sub-period;

[0140] b) Predict occlusion position based on CNR

[0141] The steps of occlusion p...

Embodiment 3

[0155] Example 3: Binding image 3 , an adaptive beam scanning method for nacelle-type wind lidar:

[0156] In the embodiment, the number of light beams is 2, and in this embodiment, the occlusion position is predicted based on the weighted fan speed and radar CNR.

[0157] S1, the radar signal processing steps are exactly the same as Embodiment 1 / 2;

[0158] S2, the impeller blockage detection step is exactly the same as embodiment 1 / 2;

[0159] S3. Blocking position prediction steps:

[0160] - Calculate the fan speed weight matrix W`:

[0161] This step is basically consistent with the S3 step in Example 1, only in the S3 → b) → ii step of Example 1, r 1 In Example 3, it is expressed as the wind turbine prediction weighted value, r 1 The acquisition method: first r 1 Set it to 0, then gradually increase it, and observe the radar data effective rate AVL (radar beam not blocked rate), until the data effective rate no longer increases to get r 1 parameter value. This p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention discloses a cabin type wind lidar adaptive beam scanning method. The method provided by the present invention comprises: automatically predicting the probability that the beam inthe next period is occluded according to the CNR calculated by the radar or the speed information sent by the fan main control, and generating the optimal beam control strategy for the next period byusing the weight calculation method, so that beam control can be realized. By using the method provided by the present invention, the probability that the beam is occluded by the fan impeller can bereduced by using the radar, so that the data efficiency can be improved, and real-time data is provided for the main control.

Description

technical field [0001] The invention belongs to the field of laser radar wind measurement, in particular to a nacelle-type wind measurement laser radar self-adaptive light beam scanning method. Background technique [0002] The nacelle-type wind-measuring lidar is installed on the top of the fan nacelle to measure the wind speed directly in front of the fan impeller. Compared with the cup-type anemometer, its measurement results are not disturbed by the wake of the fan, and can be effectively applied to the load reduction and yaw correction of the fan. [0003] The principle of radar wind measurement is as follows: figure 1 As shown (taking the two-beam radar as an example), on the windward side of the wind turbine, the radar sequentially emits beam 1 (LOS1) and beam 2 (LOS2), so as to measure the radial wind speed v_1 and v_2 of the wind speed vector v in the direction of the two beams. According to the geometric relationship, the actual wind speed component can be invert...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/95
CPCG01S17/95Y02A90/10
Inventor 朱海龙肖增利罗浩唐安庆
Owner NANJING MOVELASER TECH CO LTD