experimental test site for small wind turbines of...

Experimental Test Site for Small Wind Turbines of Narbonne Test report n° 18.5 april, 28 2010

AirDolphin Z-1000-250 Grid connected page 1 / 54

Experimental Test Site for Small Wind Turbines of Narbonne

Test report n° 18 version 5 of April, 28 2010

AirDolphin Z-1000-250 Grid Connected

Manufacturer Zephyr Corporation

Reference AirDolphin Z-1000-250

Rotor shaft axe horizontal

Number of blades 3

Rotor diameter 1.80 m

Regulation type Electronic rotational speed control

+ aerodynamic stall

Nominal output 1100W at 12.5m/s

Grid connection SMA inverter : SunnyBoy 3800

Tower type guyed tubular

Importer Eden Importateur Zephyr Montpellier

Test period November 2008 – February , 8r 2010

Test duration November, 29 2009 - February, 8 2010



Summary

1 Manufacturer Data ................................................................ 4

2 Objectives ............................................................................. 6

3 Installations .......................................................................... 7

4 Test site environmental data ............................................... 11

5 Operation and safety test .................................................... 15

5.1 Test objectives ............................................................................. 15

5.2 Operation and safety tests ............................................................. 15

5.2.1 observation of yawing at various wind speeds ............................... 15

5.2.2 Start-up and stop test sequences following the protocols

recommended by the manufacturer ............................................. 15

5.2.3 Emergency stop by action on the main circuit breaker. .................. 15

5.2.4 Checking of the generated power compared to the manufacturer data15

5.2.5 Checking of the rotational speed limitation system ........................ 15

5.2.6 Simulations of grid loss network (micro cut and normal cut) ........... 16

5.2.7 Test of preventions against not authorized parameters system changes ................................................................................... 16

5.2.8 checks of equipment and safety procedures (mechanical, electrical) for installation and maintenance ................................................. 16

5.2.9 Checking of the grounding system and lightning protection. ........... 16

6 Reliability tests ................................................................... 17

6.1 Test objectives ............................................................................. 17

6.2 Reliability test .............................................................................. 17

6.2.1 Production for at least 1500 hours at unspecified wind speed ......... 17

6.2.2 Production lasting at least 250 hours at higher or equal wind speed of 1.2 times the wind speed corresponding to the nominal power output

(data manufacturer data) ........................................................... 17

6.2.3 Production lasting at least 25 hours at higher or equal wind speed of 1.8 times the wind speed corresponding to the nominal power output

(data manufacturer data) ........................................................... 17

6.2.4 Measured energy higher than 80% of expected energy (according to

data manufacturer) ................................................................... 17

6.2.5 Structural damage .................................................................... 20

7 Power curve measurement .................................................. 21

7.1 Measured power curve .................................................................. 23

7.2 Manufacturer power curve ............................................................. 26

7.3 Power coefficient .......................................................................... 27

8 Acoustic noise measurments ............................................... 28



8.1 Objectives ................................................................................... 29

8.2 Principle ...................................................................................... 29

8.3 Measurements ............................................................................. 30

8.4 Analysis ...................................................................................... 31

8.5 Point 1 (page 39) ......................................................................... 32

8.6 Point 3 (page 43). ........................................................................ 33

8.7 Point 5 (page 47). ........................................................................ 34

8.8 Point 7 (page 51). ........................................................................ 35

8.9 Conclusion. .................................................................................. 36

8.10 Measurement point implementation ................................................ 37

9 Annexe ................................................................................ 38

9.1 Point N°1 ..................................................................................... 39

9.2 Point N°3 ..................................................................................... 43

9.3 Point N°5 ..................................................................................... 47

9.4 Point N°7 ..................................................................................... 51



1 Manufacturer Data

SPECIFICATIONS Zephyr AirDolphin Z-1000-250

Model Number

Wind Turbine Type

Rotor Diameter

Mass

Tower Diameter

Number of Blades

Blade ConstructionBlade Mass (per

piece)

Blade Method

Body Material

Product Finish

Power Generator

Control System

(Built-in original

Intelligent Power

Management)

5. Data Communication

Synchronous-type, three-phase power generator with

permanent neodymium iron boron magnet

1. Power-Assist Function

2. Inverter Stand-by Function

3. Safety Control

4. Peak Power Management

Aluminum diecast

Body Construction

Bolt-less joints

(based on traditional Japanese craftmanship)

Powder coat finish

48.6mm (1-15/16")

3

Carbon fiber laminate over solid foam core

380g (13 oz)

Interlock hub mounting

Airdolphin GTO

Z-1000-250

Horizontal axis, up-wind

1,800mm (5'10-7/8")

19.5kg (38.5 lbs)



Protection Circuit

Data Logger

Yaw Control

Direction Control

Start-up Wind Speed

Cut-in Wind Speed

Peak PowerMaximum Rotor

Speed

Output Voltage

Braking SystemCommunication

System

(Signal Output)

Inverter type

Warranty

250VDC

Regenerative electromagnetic braking system

RS-485

PV Inverter (CV mode; Constant Voltage mode)

Five years

Original Swing-Rudder System

0m/s (Power-Assist Function)

2.5m/s, 5.6mph

4.0kW (20m/s, 44.7 mph)

1,280rpm (20m/s, 44.7 mph)

Built-in

Built-in (Total energy production)

Free yaw (360 degrees)

Source :

http://www.zephyreco.co.jp/en/products/product/air-dolphin_gto/index.html

http://www.zephyreco.co.jp/en/products/product/air-dolphin_gto/index.html



2 Objectives

The Experimental Test Site for Small Wind Turbines of Narbonne is intended

to observe the behaviour and the performances of small wind turbines with a rotor diameter smaller or equal to 7 meters (or generated power smaller than

approximately 10kVA) proposed to the test within the framework of a voluntary program by a manufacturer or an official distributor.

The following points are studied:

o evaluation of operation, safety, quality, reliability and integrity of the wind turbine and associated systems, according to the protocol of

measurements defined in this document and approaching as far as possible to the rules and procedures of the IEC WT01 and IEC61400-2 standards

o measurements of the power curve and production of electrical energy of the machine according to the wind resource, and according to the

protocol of measurements defined in this document and approaching as far as possible to the IEC61400-12 standard

o measurements of noise levels at audio frequencies (acoustic noise) near

the wind turbines

o evaluation of the quality of the electrical current produced, according to

a protocol of measurements of grid disturbances defined by EDF R&D Department

o measurements of environmental conditions at the test site (speed,

direction and turbulence of the wind, temperature, pressure and relative humidity)

o appreciation of the visual impact (investigation carried out with visitors of the experimental test site)

The recording and the process of the measurements were carried out on the

test site during the period of operation of the equipment installed.



3 Installations

The test site is equipped:

with a technical building where are gathered:

o equipment to accesses the grid for each wind turbine, with room

reserved for the installation of the manufacturer grid connection equipment for each machine

o safety equipments and energy meters:

safety equipment to disconnect the sources of energy in the event of disturbance on the grid

meters for generated and consumed energy measurement of the grid disturbances (LEM QWave

parameterized according to NF-EN-50160 standard)

o equipments for power measurement in grid connection systems:

power measurement transducers (single-phase or three-phase current balanced or not, Lumel N10A)

acquisition of current information by current transformers

output of power information by analog signal 4-20mA visualization of the grid parameters (tension, current, frequency,

active and reactive power …)

o equipment for power measurement of battery charging systems:

3 phase active power transducer (Load Controls Inc. UPC) variable voltage and variable frequency

frequency transducer (Lumel P12O) DC voltage transducer (Lumel P12U) Hall effect DC current transducer (NKT DT)

o equipments for measurement of environmental parameters:

ambient temperature transducer (Prosensor 700PT100) atmospheric pressure transducer (NRG BP20) relative humidity transducer (NRG RH5)

insulating transducers (Phoenix Contact MCR-C-UI-UI-DCI)

o equipments for data recording

dedicated desktop PC computer

USB data logger (IOTech Personal DAQ/56 and PDQ2 extension) remote access by ADSL modem on telephone line



with 4 positions for installations for the wind turbines:

o 1 concrete base which can accept a wind turbine with a 7m rotor

diameter maximum (approximately 10kVA), the wind turbine can be installed on guyed or free standing tower with a maximum

height of 18m

o 1 concrete base which can accept a wind turbine with a 5m rotor diameter maximum (approximately 5kVA), the wind turbine can be

installed on guyed or free standing tower with a maximum height of 18m

o 2 concrete bases which can accept a wind turbine with a 5m rotor diameter maximum (approximately 5kVA), the wind turbine can be installed on guyed tower only with a maximum height of 18m

o each concrete base is intended to receive a mechanical adaptation plate for each tower from each manufacturer

of a 20m guyed measurement tower, equipped with:

o 3 anemometers placed at 16, 18 and 20m (NRG # 40H including 1 calibrated)

o wind vanes placed at 16 and 20m (NRG # 200P)

o 5 signal transducers with 4-20mA output (Lumel P120 and P12U)

equipment for noise measurement (on site only during the noise measurement campaigns)



Unless otherwise specified for a particular test, the tests will follow the following procedures:

recording of all the data every 2 seconds

statistical processing on 1mn (average, standard deviation, min and

max values)

data recording in a computer file

periodic visual inspection of the test site (any anomaly will be recorded

and reported)

in the event of change of equipment (measurement equipment or

equipment under test) the test will be re-started

data recorded under particular operating conditions (heavy rain, snow,

ice…) will be validated in a special data base, the criteria of selection of the data will be specified in the measurement report

throughout the measurement campaign, the data will be checked

periodically to ensure the quality and the repetitiveness of the results



a logbook will be maintained up to date on all the important events which have occurred during the measurement period

all the data recorded during the periods of unavailability of the

equipment under test will be ignored



4 Test site environmental data

December

2004 à November

2005

Temperature

(°C)

Relative

Humidity(%)

Atmosph.

Pressure

(mBar)

Maximum 38.8 83 1029

Average (1mn)

14.9 67 1011

Minimum -6.3 33 988

December 2004 to March 2005

Wind speed at 19m (m/s)


Maximum gust 30.5 - 30.2

Max

Average(1mn)

24.3 - 22.9

Average on

the total duration

7.1 - 6.0

May 2005 to

November 2005

Wind speed at

20m (m/s)

Wind speed

at 18m (m/s)

Wind speed

at 16m (m/s)

Maximum gust 26.4 25.9 25.4

Max Average(1mn)

17.7 17.4 16.8

Average on the total duration

- 5.7 5.6



Jan, 1 2008 to

june, 30 2008



Wind speed at 16m

(m/s)

Max gust 29.7 30.0 29.9

Max average (10mn)

18.9 18.5 18.0


5.64 5.50 5.44

Mean turbulence intensity on the total duration

18.96 % 19.12 % 19.11 %

Jan, 1 2009 à

december, 31 2009

Wind speed at

20m (m/s)

Wind speed

at 18m (m/s)

Wind speed

at 16m (m/s)

Max gust * 39.60 39.0

Max average

(10mn)

* 24.57 23.98


* 5.48 5.42

Mean turbulence intensity on the

total duration

* 19.23 % 19.27 %

* anemometer anomaly



Exemple de Données Météo - Semaine du 10 au 16 Janvier 2005

-2

0

2

4

6

8

10

12

14

16

18

1

Pres Atm (mBar/100) Temp (°C) Humid (%/10) Vent (m/s)

Décomposition par secteur : V1 / D1

15 45 75 105 135 165 195 225 255 285 315 345 375

Direction (°)

2

4

6

8

10

12

14

16

18

Vit

esse

m/s



Distribution par secteur

0

20 %

40 %

60 % 30

60

90

120

150

180

210

240

270

300

330

VentEnergie

Distribution des Vitesses de Vent et Intensité de turbulence à 20m

0

5

10

15

20

25

0 2 4 6 8 10 12 14 16 18 20

Vitesse de Vent (m/s)

Vale

ur

en %

Distribution Brute Distribution Corrigée A=6.33 K=1.96 Intensité de turbulence



5 Operation and safety test

5.1 Test objectives

o to check that the wind turbine shows a operational behaviour in conformity with its design

o to check that provisions related to people safety are correctly put in practice

o to test that the control and protection systems are functioning with

satisfaction

o to check the good dynamic behaviour of the wind turbine with at

least 1.8 times the wind speed corresponding to its nominal power output (data from manufacturer)

5.2 Operation and safety tests

5.2.1 observation of yawing at various wind speeds

o Yawing is fluent for all wind speed.

5.2.2 Start-up and stop test sequences following the protocols recommended by the manufacturer

o validated operation

5.2.3 Emergency stop by action on the main circuit breaker.

o validated operation

5.2.4 Checking of the generated power compared to the manufacturer data

o The generated power is just below 80 % of the power given in the manufacturer data sheet for all the wind speed, but at 13 m/s this

generated power is equal to 81 % of the one given by the manufacturer. The performance data provided by the manufacturer

are taken directly from the DC output of the generator, the electrical losses caused by the inverter are not taken into account. This may explain partially or completely the discrepancy between

the data given by the manufacturer and the measurements made by SEPEN which take into account the inverter, however we have

no precise indication of the proportion of loss to put on the account of this inverter.

5.2.5 Checking of the rotational speed limitation system

o data not directly checked, but the instantaneous measures presented as a cloud of points shows clearly the two modes of

operation of the AirDolphin: normal operation and stall operation



for high wind speed. So we see, not directly, a control of the rotational speed by the electronic of the wind turbine.

5.2.6 Simulations of grid loss network (micro cut and normal cut)

o validated operation: the wind turbine stops very quickly thanks to the low inertia of the rotor. This wind turbine is equipped with a

smart electronic system, giving each minute a little spin to the rotor in order to test if the wind speed is high enough to allow power generation, if the wind is too low the rotor stop.

5.2.7 Test of preventions against not authorized parameters system changes

o The user isn't allowed to change the operational parameters of the

wind turbine

5.2.8 checks of equipment and safety procedures (mechanical, electrical) for installation and maintenance

o The guyed mast provided by the installer was not equipped with the traditional gin pole to tilt up the tower, without this gin pole

the operation is much less safe. The gin pole has been added since installation.

5.2.9 Checking of the grounding system and lightning protection.

o Not checked



6 Reliability tests

6.1 Test objectives

o to check structural integrity and temporal deterioration of the system, the components or the materials (cracks, deformations,

wears…)

o to check the quality of environmental protections (corrosion, paintings and joints …)

o to check the dynamic behaviour of the wind turbine and its grid connection system over the test period

6.2 Reliability test

Preliminary remark:

The first period of the Airdolphin test was disrupted by a series of technical

problems related to an act of vandalism that required the replacement of the machine and a malfunction of the measurement device. The measures of

performance selected for this report were conducted on the period from nov,24 2009 to feb, 8 2010. During this period the wind speed distribution has allowed a power curve, but this period being too short to confirm the

series of reliability test, they have been validated with the machine in operation during the year 2009.

6.2.1 Production for at least 1500 hours at unspecified wind speed

o Validated test

6.2.2 Production lasting at least 250 hours at higher or equal wind speed of

1.2 times the wind speed corresponding to the nominal power output (data manufacturer data)

o we considered testing for reliability, power 1100 W at 12.5 m/s.

not validated

6.2.3 Production lasting at least 25 hours at higher or equal wind speed of

1.8 times the wind speed corresponding to the nominal power output (data manufacturer data)

wind speed 22.5 m/s (12.5 x 1.8) : not validated.

6.2.4 Measured energy higher than 80% of expected energy (according to data manufacturer)

The calculation of the energy from the measured power curve and a Weibull distribution with a shape factor K = 2 (Rayleigh

distribution), is less than 80% of the expected energy. Energy



production depends directly on the performance of the installation, the remark made in § 5.2.4 also applies here.

0

1000

2000

3000

4000

5000

6000

3.0 4.0 5.0 6.0 7.0 8.0 9.0

An

nu

al o

utp

ut (

kWh

)

Annual average wind speed (m/s)

AirDolphin Z-1000-250 annual energy output

Output SEPEN measures

Output manufacturer data

Figure 6-1 Energy output SEPEN - manufacturer



Annual wind speed [m/s]Output SEPEN measures

[kWh/an]

Output manufacturer data

[kWh/an]

3.50 156.0 400

4.00 290.4 800

4.50 474.3 1000

5.00 706.3 1250

5.50 979.0 1600

6.00 1279.3 2100

6.50 1591.1 2550

7.00 1898.4 3100

7.50 2187.3 3800

8.00 2447.3 4600

8.50 2672.2 5200

9.00 2859.0 5900

Table 6-1 Annual energy output

Figure 6-2 Airdolphin energetic output (manufacturer data)



6.2.5 Structural damage

No structural damage observed, except the last machine tested in 2010

on which the gelcoat of a blade has been damaged on the pressure side. Only the coating (gelcoat) is affected by this problem, no damage of the

internal structure of the blade has been found

View 6-1 Damaged blade



7 Power curve measurement

The data were recorded uninterrupted, with a sampling rate of two seconds:

o wind speed at 16, 18 and 20m

o wind direction at 16 and 20m

o temperature on the ground

o atmospheric pressure on the ground

o relative humidity on the ground

o active power at grid connection point (technical building)

The data are sorted out by:

o validated values compared to the sensor range

o plausible values compared to the considered site

o incomplete series on the 1mn measurement averaging period (30 data)

o values outside the validated wind direction sector

To calculate validated wind direction sector for the measurement of each

machine, it is necessary to take into account the neighbouring obstacles, which can be: another wind turbine, trees, measurements mast … The

IEC61400-12 standard gives a calculation defining the disturbed sectors by neighbouring wind turbines according to their diameter and hub height.

Disturbed sector : α = 2Arctan (2Dn/Ln + 0.25)

where Dn is the diameter of the neighbouring machine

Ln is the distance between the 2 machines

This formula has been applied for each wind turbine tower position, the following table summarizes the characteristics of the obstacles taken into

account, and the limits of the disturbed sectors calculated.

The height and the width of the obstacles other than the close machines

(trees) not having been measured, the calculation was not applied for these obstacles. However, the final selected disturbed sectors are rather strongly penalizing, since they include in fact all the disturbed sectors of each

machine, as represented on the following diagram.

One can notice that, compared to the Northern direction, the 2 large

disturbed sectors correspond to the alignment of the 4 towers. The machines were installed so that they are facing undisturbed prevailing winds (wind of

the North-West and wind of south-east).

The data processing software eliminates all the data with wind direction inside one of the 2 disturbed sectors.



Site Obstacle Diameter

Dn

Distance

Ln Angle

Lower

limit

Higher

limit

1 Plot 2 2.9 m 23.4 m 52.6° 12.7° 65.3°

1 trees not calculated

not calculated

not calculated

not calculated

not calculated

2 Plot 1 6.4 m 23.4 m 77.1° 180.5° 257.6°

2 Plot 3 1.4 m 23.4 m 40.3° 41.8° 82.2°

3 Plot 2 2.9 m 23.4 m 52.6° 215.7° 268.3°

3 Plot 4 3.6 m 23.9 m 57.7 ° 44.1° 101.9°

4 Plot 3 1.4 m 23.9 m 40.1° 233° 273°

4 trees not calculated

not calculated

not calculated

not calculated

not calculated

Summary table of the characteristics of the obstacles for the calculation of the disturbed sectors.

Secteurs perturbés

101.85 °

180.45

273.04 °

Nord

12.69 °



The data are processed to extract the following information by 1mn steps:

o average value

o standard deviation

o maximum value

o minimum value

The data are corrected according to the wind gradient

The series are normalized for the average air density measured on the test site

The power curve:

o the normalized power curve is established according to the bin method (see standard IEC61400-12 §5.2)

o the 0.5m/s bins are contiguous and aligned on the multiple of 0.5m/s

o for each bin one records:

the number and values of the normalized wind speeds (representing the 1mn normalized averages)

the number and values of normalized active power (representing the 1mn normalized averages)

o for each bin one calculates:

the total average the wind speed on the interval (total number of values divided by their number)

the total average of the power on the interval (total number of the values divided by their number)

7.1 Measured power curve

in red the calculated points of the average power curve,

in green the dispersion indicators of the measures, the horizontal lines

indicates the limits at plus and minus one standard deviation .

en blue number of measures points



0

100

200

300

400

500

600

700

800

900

1000

1100

1200

1300

1400

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Act

ive

po

we

r (

W)

-d

ata/

bin

Wind speed (m/s)

AirDolphin Z-1000-250 from 12-24-2009 to 2-8-2010

Electrical power

data number per bin

Figure 7-1 Power curve o the AirDolphin Z-1000-250

o Calculation parameters for the power curve:

Sampling rate : 2 seconds

integration interval : 1 minute

Bin width: 0.5 m/s

Direction : from 180 to 360 °

Filtering range for vertical wind gradient: -0.0 à 0.10

Filtering range for turbulence intensity: from 0.0 to 15.0 %

Corrected power according to air density and brought to the standard density of 1.225 kg/m3



There is a wide dispersion of power for high speeds due to the low number of data, but we can see also the mode of regulation of the machine with the

cloud of points on the drawing below:

0

200

400

600

800

1000

1200

1400

1600

0 2 4 6 8 10 12 14 16 18 20

Pu

issa

nce

(W

)

Vitesse vent (m/s)

AirDolphin points mesure (2 secondes)

Figure 7-2 Instantaneous power data

We can see at 10 m/s the power curve is divided into two branches, one

growing until 1200 W at 14 m/s and the other one with a relatively constant power to 450 W up to 18 m / s



7.2 Manufacturer power curve

Figure 7-3 Manufacturer power curve Airdolphin Z-1000-250



7.3 Power coefficient

0%

5%

10%

15%

20%

25%

30%

35%

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Po

we

r co

eff

icie

nt

Wind speed (m/s)

AirDolphin power coefficient

Figure 7-4 AirDolphin Z-100-250 power coefficient

The power coefficient rises 30.7% at 11 m/s and remains within the range of 25 to 30% for the speed range from 8 to 14 m/s. This ratio remains above

20% for the speed range of 6 to 10 m/s considered the most productive for small wind energy.



8 Acoustic noise measurments

PHILIPPE ZULIANI

938, chemin des Dames Noires

82000 Montauban

Tél : 05 63 63 38 61

Portable : 06 07 14 76 61

Adresse électronique : [email protected]

Date: 28 September 2009

Réf: AnalysePhase3Mat3.doc

mailto:[email protected]



8.1 Objectives

Our intervention aims at specifying the acoustic impact of wind turbine on

the environment. The selected site is the small wind turbine test site of Montplaisir in Narbonne.

8.2 Principle

The Montplaisir site includes 4 masts to support 4 windmills simultaneously. The figure on Page 37, shows the relative arrangement of these structures.

The analysis of this noise impact is based on the law of 18 April 1995 , decree 95-408 "Combatting neighbourhood noise". It fixes the maximum

noise aggravation: 5 dB(A) during the day (7am - 10pm) and 3 dB(A) during the night (10pm - 7am). The aggravation is the difference in noise levels noted when the installation is operating (ambient noise) and when it is

stopped (background noise).

For each mast, and thus for each of the windmills fixed to them, we

considered 4 points, Points 1,3,5,7, respectively located at distances of 5m, 10m, 20m and 35m from the mast.

For each of these points, we measured the ambient noise, the background

noise and by subtraction determined the aggravation.

The reading, determination of the ambient or background noise for one

analysis point, consisted in taking five samples of 10 s during a period of 5 minutes.. These 10s measurements are made via frequency analysis based on one third octave.

The study is conducted mast by mast. With only one windmill in operation, for these 4 points, we measured the ambient noise, then stopped the

windmill being studied to measure the level of background noise for these 4 points. The approach was repeated for the three other windmills.

Associated with these acoustic measurements are wind speed measurements

determined using an anemometer placed on a weather mast located in the centre of the site.

In order to measure the variability of the windmills' noise emissions, we conducted 3 measurement campaigns. By campaign we mean a characterisation of ambient noise and background noise on all site points, for

a given wind speed.

Following the analysis by windmill, a summary sheet is inserted to give an

overall appreciation of its noise impact. For the three campaigns, its specifies the levels of ambient noise, of background noise, the corresponding

aggravation. All these characteristics are expressed in dB(A). A campaign, wind speed determined, may be accompanied by an index, indicating an occasional aggravation greater than 5 dB(A) in a specific third octave band:

if this band is located in the frequency field defined by the octaves 125 Hz and 250 Hz, this index is L,



if this band is located in the frequency field defined by the octaves 500 Hz and 1,000 Hz, this index is M,

if this band is located in the frequency field defined by the octaves

2,000 Hz and 4,000 Hz, this index is H,

This document only examines the acoustic impact of the windmill located on

site mast no. 1 on 06.06.09

8.3 Measurements

Equipment used: CESVA real time analyzer, type RC-401.

The table below specifies the characteristics of these arrangements indicating:

the windmill type, Windmill,

the installation mast, Mast,

the measurement campaigns conducted, by date, Campaign,

Wind turbine

Mast

Campaign

06/06/2009

7H30

06/06/2009

10H30

06/06/2009

13H00

AirDolphin Z-1000-250

3 X X X

All the results are presented in appendix.



8.4 Analysis

The first three campaigns correspond to three wind configurations: for the

first two campaigns, the wind was from the land (downwind of the windmill), for the third campaign it was from the sea (upwind of the windmill): for

campaigns 1 and 2, it may be considered weak. For the following campaign, it was average.

The force associated with the wind direction has an immediate impact on the

background noise perceived, depending on motorway traffic, surrounding vegetation, the presence of pines, scrub type vegetation, and the

topography.

It can be seen that the background noise varies from 49 dB(A) to 37 dB(A), higher at the crest, (points 1 and 3) than on the slope (points 5 and 7). This

is especially true when the wind is from the land (screen effect due to the topography in relation to the A61). During sea winds, the A9, and the

National Road, being the two main sources, the impact is not reduced by this phenomenon, as they are in direct line of the Montplaisir site. However, being further away, the atmospheric absorption, especially at high frequencies

(2,000 Hz and 4,000 Hz) is greater: characteristic curves obtained with a plateau reaching the 1,000 Hz octave, then a drastic drop for the higher

octaves.



8.5 Point 1 (page 39)

Wind turbine noise noticeable for the entire range of analyzed wind speed

and noise on the existing site, an impression reinforced by the occurence of an emergence in the order of 6 dB (A).

70

60

50

40

30

0

10

70

60

50

40

30

dB

(A)

dB

(A)

Niv

eau

so

no

reE

mer

gen

ce

-20 -10 0 +10 +20

Vitesse du vent

m/s

ambiant résiduel émergence

5

3

0

10

5

3

Fiche récapitulative

Mât N°3 / Point N°1

06/06/2009

LMHLMH



8.6 Point 3 (page 43).

As with the previous point, the perception of the wind turbine is clear.

Getting emergence up to 5 dB (A).

70

60

50

40

30

0

10

70

60

50

40

30

dB

(A)

dB

(A)

Niv

eau

so

no

reE

mer

gen

ce

-20 -10 0 +10 +20

Vitesse du vent

m/s


5

3

0

10

5

3



06/06/2009

MH LMH




The distance from the mast (measurement point 20 m from it), reduces the

perception of the wind turbine noise. This sensation is materialized through a reduction in emergence observed, the latter being about 2 dB (A).




The trend observed in the previous point is confirmed:

o Reduced perception. The spectral difference between the ambient noise and may explain,

o Low emergence, not exceeding 3 dB (A) with upwind (-6 m / s).

70

60

50

40

30

0

10

70

60

50

40

30

dB

(A)

dB

(A)

Niv

eau

so

no

reE

mer

gen

ce

-20 -10 0 +10 +20

Vitesse du vent

m/s


5

3

0

10

5

3



06/06/2009

HLMH LH



8.9 Conclusion.

This series of measurements validated the meteorological protocol

implemented specifying certain site characteristics which are interesting due to the many possible observation possibilities: upwind or downwind,

significant variation in background noise depending on direct or indirect exposure of the points to the motorway environment. . This type of investigation also enables the noise emissions of windmills to be examined

practically according to a wind range of configurations, for their impact on the environment.



8.10 Measurement point implementation

20 m20 m20 m

Au

toro

ute

5 m

10

m

20

m 35

m

1234

Position Mât

Point de référence

Point Distance

Implantation des points de mesure

Mer Méditerranée

Point 1

Point 3

Point 5

Point 7



9 Annexe

Characterization of noise dispersion of the AirDolphin Z-1000-250, mast 3.



9.1 Point N°1

20 m20 m20 m

Au

toro

ute

5 m

10

m

20

m

35

m

1234

Position Mât


Point Distance


Mer Méditerranée

Point 1

Point 3

Point 5

Point 7



9.2 Point N°3

20 m20 m20 m

Au

toro

ute

5 m

10

m

20

m

35

m

1234

Position Mât


Point Distance


Mer Méditerranée

Point 1

Point 3

Point 5

Point 7



9.3 Point N°5



9.4 Point N°7

20 m20 m20 m

Au

toro

ute

5 m

10

m

20

m

35

m

1234

Position Mât


Point Distance


Mer Méditerranée

Point 1

Point 3

Point 5

Point 7

experimental test site for small wind turbines of...

Documents