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Technical information on radio interference from Wind turbine

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[member was deleted] 09/05/14 11:12

This post is created to invite administrations to share there experience with respect to wind turbines interfering to any radio services (e.g. fixed service, radar or broadcasting, etc..). Technical information are welcome.

Nicholas Woollard 11/06/14 12:05

Dear David and all,

The Joint Radio Company (UK) manages approximately 8000 UHF fixed links, and also approximately 1000 1.4 GHz / microwave fixed links, on behalf of the UK gas and electricity industries.

Interruption to the reliable operation of these links compromises the integrity of the UK energy generation, transmission and distribution systems.

During the design phase, therefore, each proposed fixed link is checked to see whether there may be any problems with existing or proposed wind turbines / wind farms.

For more wind turbine / windfarm co-ordination information, please see:

http://www.jrc.co.uk/wind-farms and

http://www.jrc.co.uk/sites/default/files/CalculationOfTheClearanceZone3.1.pdf (also attached).

 

The JRC is therefore very interested in participating in this WP6A work.

 

Best wishes

Nick Woollard (JRC)

 

Axel Jessner 20/08/14 14:46

Dear Colleagues,

CRAF greatly welcomes the establishment of this forum. We are of the opinion that an expert discussion of the subject is overdue.

Radio interference from industrial sources is  and has been a permanent concern for radio astronomy. Large observatories have been built in remote rural areas in order to provide terrain and distance shielding from industrial radio noise. Hence the idea of siting wind parks with fast switching  power converters close to RAS stations goes against this initial protective measure and can be a direct threat to the operation of the stations.

Interference can have different origins:

1 Emissions  from the equipment

2 Reflections of  emissions from other stations (e.g. FS, Broadcasting, radio location) by wind power devices on shared bands overcoming current topographical shielding between the emitter and the RAS station.

3 at close range: modulation of the sky background temperature by the moving vanes of the rotor. Note that the sky background is at a noise temperature of a few Kelvin whereas the rotorblades emit at 300 K. Radio astronomy routinely  measures noise temperature differences of the order of milli-Kelvins or less.

CRAF has been studying this problem for many years and there has been a workshop in Onsala (Sweden) on the subject. Please see [dead link removed]  for this. We have also published a document explaining the background and proposing a guideline for case by case compatibility studies (http://www.craf.eu/CRAF-11-01.pdf and attached). Last but not least, we have presented a paper to radio scientists and engineers at the German U.R.S.I. Forum in 2012 . The peer reviewed article is also attached for your convenience.

Let me again emphasise, that we are extremely grateful for the opportunity to discuss these problems affecting nearly all RAS stations in the CEPT area and elsewhere. It will be my pleasure to participate in the new forum and I look forward to our future discussions.

Sincerely yours

Axel Jessner

Max-Planck-Institute for Radio Astronomy

(Germany)

 

 

David de la Vega 12/12/14 11:12

Dear colleagues,

First of all, let me introduce our research group in the University of the Basque Country (UPV/EHU) regarding our expertise in analyzing the impact of wind farms on radiocommunication services.

Our main outcomes in this area are:

  • A theoretical analysis and field trials to register scattered signals from wind turbines
  • A propagation channel model for reception in the presence of wind turbines at UHF band. The model has a theoretical basis and it is completed with results from field trials
  • A software tool to develop impact studies of wind farms before they are installed. Services under analysis are weather radars, ATC radars, radionavigation aids, terrestrial television and radio links. International and European guidelines are applied to determine the potential impact.

 

We have published several articles related to empirical and theoretical analysis of scattering from wind turbines and the impact on TV services. A selection of the results has been submitted to ITU-R Study Group 6, and my colleague David Guerra has recently chaired a correspondence group on this topic.

Additional information of our work can be found at:

http://www.ehu.eus/tsr_radio/index.php/research-areas/impact-of-windfarms-on-wireless-systems [edit: link updated]

http://www.ehu.es/tsr_radio/images/stories/Events/wind_turbines.pdf

 

We see this forum as an excellent opportunity to discuss on this subject from an unbiased perspective. Contributions will help for sure to develop analysis methodologies and to determine well justified criteria for evaluating the potential impact on different services. We will be willing to participate with our results.

 

David de la Vega

University of the Basque Country (UPV/EHU)

Spain

 

Dietmar GAUL 13/01/16 15:37

Dear Hans, dear Colleagues,

documet WTFG(16)001 has a extremely large file size of 53 MB, because of a lot of pictures. This file could be now compressed to a size of 18 MB.

This document is a measurement protocol of an investigation of the effects of wind turbines on fixed Radio direction Finders. The measurements were made from the Radio Monitoring Service of the Federal Network Agency (BNetzA) at Rheurdt near Cologne (Germany).

Kind regards

Dietmar Gaul

Federal Network Agency (BNetzA)

Germany