V66-1,75 MW. Pitch regulated wind turbine with OptiTip and OptiSpeed

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1 V66-1,75 MW Pitch regulated wind turbine with OptiTip and OptiSpeed

2 Optimised energy generation Vestas has developed the V MW turbine in order to optimise energy production and to accommodate requirements for noise levels and efficiency. In the same way as the other turbines in the Vestas product range, this model is based on thoroughly tried and tested technology. The V MW turbine has a rotor diameter of 66 metres and a hub height of 6-78 metres. The external dimensions are thus the same as those of its predecessor. The new initiatives are to be found in the nacelle, where the greatest improvements have been made in the area of electricity generation. The V MW turbine is fitted with OptiSpeed, a system that allows variable speed regulation. Vestas OptiSpeed * OptiSpeed is a further development of the OptiSlip system, which allowed the revolution speed of both the rotor and the generator to vary by as much as 1%. With OptiSpeed, the revolution speed can now vary by up to approximately 6%. OptiSpeed is an efficient solution because the converter only transforms the energy from the generator rotor, which is only a small part of the total energy generated by the system. The energy generated by the generator rotor is converted back into electricity suitable for the grid by the converter. Thanks to the converter, the need to consume reactive power from the electricity grid is eliminated. However, it is possible to adjust the turbine to supply or consume reactive power, if required. Optimal pitch with OptiTip As with all other Vestas turbines, the V66 turbine is equipped with microprocessorcontrolled OptiTip pitch regulation, which ensures continuous and optimal adjustment of the angles of the blades in relation to the prevailing wind. The OptiTip and OptiSpeed systems make it possible to optimise the solution to the often contradictory requirements for high output and low sound levels, depending on the location. On the V66 turbine, the pitch mechanism is fitted in the blade hub itself and contains a separate hydraulic pitch cylinder for each blade. These separate pitch cylinders also ensure triple braking safety, because one feathered blade is sufficient to stop the turbine. Lightning protection Naturally, the new turbines are equipped with Vestas Lightning Protection, which protects the entire turbine from the tips of the blades to the foundations. The system conducts almost all lightning strikes harmlessly past the sensitive parts of the nacelle and down into the earth. As an extra safety measure, the delicate control units and processors in the nacelle are also protected by an efficient shielding system. The lightning protection system is an improvement of the system used on earlier Vestas turbines. Naturally, it has been thoroughly tested and conforms to both the DEFU recommendation and the applicable IEC standards. Proven Performance We spend many months testing and documenting the performance of the Vestas turbines. When we are finally satisfied, we run one last check by allowing an independent organisation to verify the results. This is standard practice at Vestas a procedure we call Proven Performance. It is our guarantee that your Vestas turbines meet the very highest requirements for energy production, availability factor, power quality and sound levels. In short: OptiSpeed optimises energy production, especially in modest winds, making it easy to adapt the operation of the turbine to the parameters of the electricity grid. Lower sound level Sound levels are of crucial importance when deciding on the placement of wind turbines in populous inland areas often at locations where wind speeds are low. Thanks to the low speed of revolution of the V66 turbine in modest wind speeds, Vestas has taken yet another important step towards fulfilling requirements for a wind power solution with a low sound level. The Optispeed feature also makes it possible to program the turbine sound levels before installation, so the operation of the turbine is tailormade for the specific characteristics of the chosen location. *) Vestas OptiSpeed is not available in the USA and Canada

3 Hub controller 2. Pitch cylinder 3. Main shaft 4. Oil cooler 5. Gearbox 6. VMP-Top controller with converter 7. Parking brake 8. Ultra-sonic wind sensors 9. Service crane 1. Transformer 11. Blade hub 12. Blade bearing 13. Blade 14. Rotor lock system 15. Hydraulic unit 16. Yaw ring 17. Machine foundation 18. Yaw gears 19. Composite disc coupling 2. OptiSpeed -generator 21. Generator cooler Wind/sound Sound (db(a)) Wind speed (m/s) Sound 12. db(a) Speed of revolution (rpm) Speed of revolution (rpm) The figure shows the relationship between wind speed, sound levels and speeds of revolution for turbines equipped with OptiSpeed. It clearly demonstrates that sound levels are much lower at lower speeds of revolution. In fact, at a wind speed of 4 m/s, the sound output will be approx. 1 db(a) lower than at a speed of 8 m/s. Measured for other sound levels, the reduction achieved can be as much as 14 db(a). Please note that in this context a reduction of 3 db(a) is considered to constitute a 5% reduction in sound level.

4 Rotor Diameter: 66 m Area swept: 3,421 m 2 Revolution speed: 21.3 rpm Operational interval: Number of blades: 3 Power regulation Pitch/OptiSpeed Air brake: Feathered Tower Speed (m/s) Vestas V MW with OptiSpeed Wind Hub height(approx.): m Operational data Cut-in wind speed: 4 m/s Nominal wind speed: 16 m/s Stop wind speed: 25 m/s 3 Pitch Type: Nominal output: Driftsdata: Generator Asynchronous with OptiSpeed 1,75 kw 5 Hz/6 Hz 69V Gearbox Angle (deg) Type: 1 planet step/2-step parallel axle gears Type: Control Microprocessor-based control of all the turbine functions with the option of remote monitoring. Output regulation and optimisation via OptiSpeed and OptiTip pitch regulation. Weight (IEC IA) Hub height: 6 m 67 m 78 m Tower: 15 t 122 t 199 t Nacelle: 57 t 57 t 57 t Rotor: 23 t 23 t 23 t Total: 185 t 22 t 279 t Speed (rpm) 5 Hz Generator Output 6 Hz The sound output level can be adjusted by varying the speed of revolution and pitch angle of the turbine as illustrated in the figure below. In practice, this means that the sound level recorded at a distance of 375 m (hub height 78 m), for example, can be reduced from 44.9 to 4.4 db(a). Power (kw) Output (kw) V MW power curves Wind speed (m/s) 12. db(a) 12.5 db(a) 14. db(a) 16.5 db(a) OptiSpeed allows the speed of revolution of both the rotor and the generator to vary by approximately 6%. This reduces fluctuations in the grid system as well as minimises the loads on the vital parts of the turbine.

5 Profitable and flexible To increase the performance of a wind turbine, simply increase its dimensions. That, at least, is the conventional way of thinking. And it must be said that it works, more or less. However, it is not enough simply to increase output it is also a matter of building turbines that are better able to adapt to their surroundings, whether natural or man-made. Using the unique Vestas OptiSpeed system, we have succeeded in designing a flexible turbine that adapts to its surroundings and exploits them to the full. OptiSpeed extends the number of potential sites for a wind turbine. For example, the sound level can be optimised to suit local conditions, and areas with modest wind are now becoming more attractive. The external dimensions of the V MW turbine are the same as those of its predecessor, the V MW. All the changes that have been made are inside the nacelle and these are important changes. Thanks to the OptiSpeed system, we have managed to increase the turbine s production, improve areas such as power quality and sound level, and, at the same time, have increased its efficiency in modest wind conditions. At wind speeds as low as 4 m/s, the V66 turbine can exploit as much of the wind energy as at 8 m/s. This is something of an innovation. If you value profitability and the ability to adapt, then you are sure to appreciate OptiSpeed, and, of course, the V66.

6 Contacts Subsidiaries Vestas - Danish Wind Technology A/S Smed Sørensens Vej Ringkøbing Fax vestas-dwt@vestas.com Vestas - Scandinavian Wind Technology A/S Smed Sørensens Vej Ringkøbing Fax vestas-swt@vestas.com Vestas - International Wind Technology A/S Smed Sørensens Vej Ringkøbing Fax vestas-int@vestas.com Vestas - American Wind Technology, Inc. 111 SW Columbia Street, Suite 48 Portland, OR 9721 USA Tel Fax vestas-awt@vestas-awt.com Vestas Deutschland GmbH Otto-Hahn-Strasse Husum/Nordsee Germany Tel Fax vestas@vestas.de Vestasvind Svenska AB Åkarevägen Falkenberg Sweden Tel Fax info@vestasvind.se Vestas - Nederland Windtechnologie B.V. Dr. Langemeijerweg 1 a Postbus AB Rheden The Netherlands Tel Fax vestas@vestas.nl IWT - Italian Wind Technology S.r.l. Via Ariosto 12 Zona Industriale 741 Taranto Italy Tel Fax vestas@vestas-iwt.it Vestas - Celtic Wind Technology Ltd. P.O. Box 9263 Campbeltown, PA28 6WA, Argyll Scotland Tel Fax v-celtic@vestas.com Sales companies Vestas Hellas Wind Technology S.A. 15, A. Papandreou Ave. 2nd Floor Glyfada, Athens Greece Tel Fax Vestas France SAS Le Millénium Bâtiment A 51, rue Denis Papin F-34 Montpellier France Tel Fax vestas-france@vestas.com Vestas - Australian Wind Technology Pty. Ltd. 33 Coventry Street, Southbank Melbourne, Victoria 36 Australia Tel Fax Beijing Vestas Wind Technology Ltd. 29A2, China Merchants Tower, Jianguo Rd. Chaoyang District Beijing 122 China Tel: Fax: Vestas - Canadian Wind Technology, Inc. R.R No Concession 5 Kincardine, Ontario N2Z 2X6 Canada Tel Fax Associated company Vestas RRB India Ltd. 189, Sukhdev Vihar New Delhi India Tel Fax vrrb@gndel.global.net.in 5/3 Vestas Wind Systems A/S Smed Sørensens Vej Ringkøbing Fax vestas@vestas.com