11 A.M. A 5 P.M. 11 A.M. 5 P.M. B 11 A.M. 5 P.M. C Example of Shadow Flicker Control System Operation: At 5:00 P.M. the shadow casted by wind turbine B reaches the nearby building. With light intensity measured to be above the established threshold, turbine B is temporarily paused to avoid the negative impact of shadow flicker. The remaining turbines in the wind farm continue to operate. Availability of Vestas’ Shadow Flicker Control System: V90-2.0 MW™ V100-2.0 MW® V110-2.0 MW® V120-2.2 MW™ V105-3.45 MW™ V112-3.45 MW® V117-3.45 MW® V117-4.2 MW™ V126-3.45 MW® V136-3.45 MW® V136-4.2 MW™ V136-4.5 MW™ V150-4.2 MW™ V150-4.5 MW™ V155-3.6 MW™ V150-6.0 MW™ V162-6.2 MW™ V162-7.2 MW™ V172-7.2 MW™ Vestas Shadow Flicker Control System is available for new turbine sales and retro- fitting to the existing installed base. For retrofitting, scope of deliverables may differ depending on turbine variants and the Vestas Power Plant Controller generation. Determining shadow flicker The Vestas Shadow Flicker Control System consists of a controller and a pair of light intensity sensors. A light intensity sensor is installed on either side of the turbine tower facing directly east and west. By measuring and comparing the light intensity of the two sensors, the system can determine if direct sunlight is present. Based on information about the location of the sun, the turbines, and the surroundings, the controller can determine if any turbines are causing shadow flicker onto inhabited areas. Wind Pro configuration files are used for the configuration of the system. Shadow flicker management To limit shadow flicker impact on the surroundings, the Vestas Shadow Flicker Control System will pause a turbine if it determines that the turbine is causing shadow flicker over an inhabited area. As soon as the period of shadow flicker ends, operation is resumed to continue production. To further maximise energy production where permitted in applicable regulations, the system can be configured to allow for a certain amount of accumulated shadow flicker per day or per year before pausing the turbines. The system will log whenever a turbine is temporarily stopped due to shadow flicker. Based on the log, reports can be generated, for example, to document lost energy production or as evidence of correct operations for compliance auditing purposes. Contact us Please contact your local Vestas service team for your specific requirements or market- specific availability. ©Vestas 201 2 5 2 This document was created by Vestas Wind Systems A/S and contains copyrighted material, trademarks and other proprietary information. All rights reserved. No part of the document may be reproduced or copied in any form or by any means such as graphic, electronic or mechanical, including photocopying, taping or information storage and retrieval systems, without the prior written permission of Vestas Wind Systems A/S. All specifica- tions are for information only and are subject to change without notice. Vestas does not make any representa- tions or extend any warranties, expressed or implied, as to the adequacy or accuracy of this information. Vestas Wind Systems A/S Hedeager 42 . 8200 Aarhus N . Danmark Tlf: +45 9730 0000 . Fax: +45 9730 0001 vestas@vestas.com . vestas.com 10/2022 – EN
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