DELTAWind and Energy Consultancy

Niels Stengaard Hansen

Planning for new windfarms

• Many aspects to consider, such as

– Initial cost and maintenance cost

– Wind resources and expected output

– Power quality and grid requirements

– Noise impact

– Shadow impact

– Supplier and Technology

– Local subsidies

– Will I make it a core competence or use consultants

The Knowledge Centre DELTA

DELTA is one of Europe's leading test-, design-, service-,

consulting- and educational organisations within electronics,

software, optics and acoustics.

• More than 60 years of experience

• 270 employees out of which 50% are engineers

• Annual turnover 31,5 Mill Euro

• 50% export

• 2,500 customer assignments annually

• Headquarters in DK

• Locations in DK, UK and SE

DELTAKey competencies

• Manufacturers and

suppliers

– Testing and validation

(EMC, Reliability, noise

and vibration)

– Specification of

components

– Certifications and

approvals

• Windfarm owners and

developers

– Noise impacts

– Power quality and grid

requirements

– Troubleshooting

Special CasesAcoustics

Principle of Auralisation (simulation of WT sound)

• Record the windturbine (using HATS or single microphone)

Plate

Free field

HATS

Nord2000

Pos. B

• calculate the Propagation Path to the sound source and

manipulate the recorded signal

180 m

180 m

Auralised Position 3Wind Speed: 6 m/s (10m)Wind turbines Hub height: 60 m

STOP

Play manipulated sound in calibrated surrounding

Case: 2007 Low Frequency Disturbance by wind turbines

Masking

Background noise

Sound transmission

How does meteorology affect sound propagation

Listening test

Litterature study

Measuring

• Samples for listening test

Noise generation

DELTA advantage

• Grown with the industry since the early days

• Independent

• Combines experience with ongoing research to support our

customers

For more info:

www.delta.dk

customercentre@delta.dk

nsh@delta.dk