KR20130073410A - Noise monitoring and control system on wind farm using noise map - Google Patents

Abstract

PURPOSE: A system using a noise map for monitoring and controlling noise in a wind power generation complex is provided to determine a noise level which becomes different in the day and night times and output in a real time basis qualitatively and quantitatively and to correspond possessively to the noise limit which becomes different in the day and night times. CONSTITUTION: A system using a noise map (301) for monitoring and controlling noise in a wind power generation complex comprises a wind power generator (100), a W-ENPRO (300), and a control unit (200). The W-ENPRO is a noise propagation predicting program. The control unit transmits and feedbacks signals to the wind power generator and the W-ENPRO. A separate operation motor is installed in the inside of the wind power generator when installing the control unit of the wind power generator. The wind power generator transmits the information of the output, a wind speed, a pitch angle, and RPM. The control unit transmits the information to the W-ENPRO. The W-ENPRO generates noise data by using a predetermined equation based on the information.

Description

Noise monitoring and control system for wind farm using noise map {NOISE MONITORING AND CONTROL SYSTEM ON WIND FARM USING NOISE MAP}

 The present invention aims at real-time monitoring and real-time control system of noise generated from wind farms, and has developed W-ENPRO, a noise propagation prediction program. The noise map resulting from this program enables real-time monitoring of the noise generated by the wind farm, and also allows for the prediction of wind farm noise at any location and blade rotation speed (RPM) and By controlling the pitch angle, the amount of propagation of noise is reduced.

 Due to economic and technical factors among renewable energy sources, the wind power generation industry has been greatly developed. The wind energy market has grown by more than 20% annually over the last decade, proving this. It is the emergence of large wind farms that has made this increase possible. However, the turbines installed in these wind farms can run for up to 24 hours as long as the wind permits, so residents around the park complain about noise.

 The most important factor in the construction of existing wind farms was annual power generation, which was installed in an area with good wind resources and easy system maintenance. Therefore, in order to solve the sources of complaints caused by the residents around the existing wind farms, noise reduction efforts should be made, but it is very difficult to achieve the noise reduction of the existing wind generators. It is difficult to achieve this because it does not take into consideration the low-noise blade or the design that is far away from the residence. Can be.

The sound power level of a single generator can be determined by the following equation using the output of each wind generator or the wind speed and blade rotation speed. [1], [2]

[Equation 1]

&Quot; (2) "

는 발전기 정격 출력량을 나타내며, 단위는 W(Watt)이다.

은 블레이드 끝단에 유입되는 상대 속도이며 이는 다음 수식으로 나타낸다.
here

Denotes generator rated power output and unit is W (Watt).

Is the relative velocity entering the tip of the blade, which is given by

&Quot; (3) "

는 유입류 속도이며,

는 블레이드 끝단의 회전 속도 대 유입류 속도비를 뜻한다.here

Is the inflow velocity,

Is the ratio of rotational speed to inflow velocity at the blade tip.

Using the sound power information of a given wind turbine, the noise propagation theory can predict the noise level at the receiver location in real time.

&Quot; (4) "

)를 구할 수 있다. 여기서

는 거리에 따른 감쇠량,

는 각각 지형과 대기에 의한 감쇠량을 나타낸다. 풍력 단지에서 임의의 위치에 도달하는 소음도는 수학식 5처럼 계산 할 수 있다.
Using Equation 4, the noise level at the receiver position (

) Can be obtained. here

Is the amount of attenuation over distance,

Represent the amount of attenuation caused by the terrain and the atmosphere, respectively. The noise level reaching an arbitrary position in the wind farm can be calculated as Equation 5.

&Quot; (5) "

[1] Lowson, M. V., 'Assessment and Prediction of Wind Turbine Noise'. Flow Solutions Report 92/19, ETSU W / 13/00284 / REP, 1992

[2] Hagg, F. van der Borg, NJCM, Bruggeman, JC et al, 'Definite AeroGeluidonderzoek Twin.', Stork Product Engineering BV, SPE 92-025, 1992

 The present invention is a system for reducing wind noise reaching an arbitrary position by adjusting the blade rotation speed and pitch angle of an individual wind generator using a real-time noise prediction map of a wind farm. It is very easy to apply to existing wind farms and individual wind generators. In order to reduce the noise of wind turbines already installed, it is necessary to redesign the blade, attach a noise reduction device, or install a soundproof wall.However, the method of controlling the rotation speed and pitch angle of the system can reduce the cost and provide real-time noise map. As a result, it can be used as a quantitative and qualitative indicator.

In order to achieve the above object, the present invention sets the entire system as shown in FIG. Individual wind generator 100, the noise propagation prediction program W-ENPRO (300) and the wind generator and the W-ENPRO signal transmission and feedback control unit 200 is composed of. The 200 can be installed inside or outside the 100, but when it is installed outside, a separate operating motor must be installed inside the 100.

When the 100 is running, the 200 sends the wind speed, rated power output, blade rotation speed and pitch angle information to the 300. Here, 300 calculates the sound power of the individual wind generators using Equation 1 or Equation 2 using the signal received from 200, and derives the noise map 301 according to the terrain information. After that, if the noise level in the desired area exceeds the reference value or the noise tolerance, the blade rotation speed or pitch angle adjustment amount is calculated and sent back to 200, and then the signal is sent to the corresponding 100 to adjust the blade rotation speed or pitch angle.

As the pitch angle 1 of the blades decreases, the turbine noise level decreases by 1 dBA. In addition, the reduction of the noise level according to the rotational speed (RPM) of the blade can be predicted from FIG. In addition, it is possible to quantitatively and qualitatively determine the noise level that changes day / night from the 301 output in real time, and actively respond to the noise tolerance applied differently for day / night.

[3] Klug, H., Osten, T., Jakobsen J., Andersen B. et al, 'Aerodynamic Noise from Wind Turbines and Rotor Blade Modification.', JOULE II, Project JOU2-CT92-0233, Final Report, DEWI-V-950006, 1995

1 is a schematic diagram of a noise monitoring and control system in a wind farm using a noise map.
2 is a noise graph of the 3MW wind turbine according to the blade rotation speed (RPM) change
3 is a schematic diagram of a wind generator including a wind vane and a control unit including a GPS receiver.
Figure 4 is a schematic diagram of a control unit for controlling the input and output information of the wind generator and adjusting the blade through the operating motor
5 is a schematic diagram of a numerical analysis program for creating a noise map by inputting a start condition of a wind generator;

 Figure 1 shows the overall flow of the invention system. First, output power, wind speed, pitch angle, and RPM information from the wind generator 100 are transmitted to the controller 200, and 200 transmits these values to the W-ENPRO 300, and 300 based on the information is expressed by Equations 1 to 5 below. Generate a noise map 301 using. Here, a value is set to 200 by resetting the blade rotation speed and pitch angle based on Equation 2 and FIG. 2 in an area where a noise level is higher than the allowable noise level or a noise level may be affected by residents at a certain arbitrary position. Based on this signal, the 200 runs an internal motor to adjust the blade rotation and pitch angle of 100, which in turn reduces noise levels.

 When the wind blows to 100 of FIG. 3, an aerodynamic load is generated on the blade 101 and 101 starts to rotate. In this case, the anemometer 104 measures wind speed and wind direction and transmits the measured wind speed to the controller 200. In addition, it transmits the torque generated every time 101 rotates and the output information of 100 generated by it to 200. As shown in FIG. 4, the control unit 200 transmits GPS reception information embedded in 104 to the internal chip 1 202 through the data cable 208, and extracts latitude, longitude, and height information from 202. In chip 2 203, the output value of 100, the rotational speed, the pitch angle, and the like are stored in 203 as a place for storing information on which 100 operates. Chip 3 205 is a part in charge of the input value / output value of the control unit. The 205 transmits an output value of 100, a rotation speed, a pitch angle, wind speed, latitude, longitude, height information, and the like to 300. 205 also receives the changed rotation speed and pitch angle of 100 and transmits it to chip 4 206, which receives the command to drive the RPM and pitch angle adjustment motor 207. 207 drives 101 with the RPM and pitch angle received.

 Numerical analysis is performed in the W-ENPRO 300 described in FIG. 5 based on the wind speed, rotation speed, and turbine position information received from 205. The data received at 205 is used as an input value of 300, and the GIS module 304 calculates the position of each turbine 100 after numerical lattice of GIS geographic information. Thereafter, 100 acoustic powers from the noise source module 305 are substituted into the propagation module 306. In 306, as described in the background art, the noise map 301 is completed in consideration of the influence of the terrain and the influence of the atmosphere. The control module 302 performs the task of comparing the noise level value with the allowable value at any position from 301. If the noise level is higher than the allowable value, the position of the corresponding 100 is searched, and the value 303 which readjusts the rotational speed or pitch angle of the blade corresponding to the position is transmitted to 205 to change the driving condition of 101. .

 Specific embodiments and effects of the present invention have been described, and further modifications are possible starting from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the embodiments, but should be determined not only by the claims below but also by those equivalent to the claims.

Claims (6)

Noise monitoring and control system for wind farm using noise map The method according to claim 1,
Monitoring system for noise reduction of individual wind generators as well as wind farms The method according to claim 1,
System that changes the driving conditions of the wind turbine blades for noise reduction in parallel with noise monitoring The method according to claim 1,
Program for calculating numerical value by separating noise source module and radio wave module in making noise map The method according to claim 1,
System that individually adjusts the entire system individually or wind farm for noise reduction The method according to claim 1,
Analysis program that connects the GPS receiver to the wind turbine, inputs the location of the wind generator on the GIS numerical map, and utilizes it as noise source information.

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