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Load and power modes software Fewer turbines mean lower cost, while production and business case certainty are optimised. Additionally, at some sites, there is a limit to how many MW the customers may install. If a site is constrained to 50 MW, Vestas may, as an example, offer 27 V100-1.8 MW turbines to the customers, but this only adds up to 48.6 MW. By applying Power Modes, we are able to offer 25 V100-2.0 MW turbines instead. Power output -- Reference power curve ■ Power modes (up-rating) ■ Load modes (de-rating) Optimising business case by flexible turbine configuration Wind sites are classified according to certain climactic characteristics: IEC IA, IEC IIA, IEC IIIA. But in the real world few sites fit these definitions perfectly. To extract the maximum potential wind power from a site, turbines must be configured for uneven wind conditions, turbulence levels, varied topography and air density. Vestas Load and Power Modes is an advanced wind sector management system. It is designed to increase the flexibility of individual turbines, exploit optimum power curves of each turbine within your site, maximise energy production and protect your return on investment (ROI). With the Vestas Load and Power Modes software it’s possible to customise the turbine’s operation according to site specific wind conditions. This is done through a pre-defined power curve for each wind direction. Initially developed for the V90-1.8 MW, V90-2.0 MW and V90-3.0 MW turbine range, this state-of-the-art system is now being extended to the V100-1.8 MW. Wind speed The illustration shows how Power modes and Load modes can uprate and derate the power output of a turbine to suit the weather conditions at any specific time. Load Modes: Maximum production in harsh wind conditions Every outdoor person knows that wind can be inconsistent. From one direction it might be blowing in from across the sea with no obstacles in its path to interrupt air flow. From another direction, obstacles such as trees might cause the wind to be disrupted and uneven. Our Load and Power Modes system is able to de-rate a turbine when climate conditions are fierce enough to cause unnecessary wear. By selecting the optimum power curve from the range available, production can continue, albeit at a slightly lower rating – a V100-1.8 MW de-rated to 1.5 MW, for example. De-rating the turbine keeps output as high as possible, ensures a longer life span of major components and requires less servicing. Vestas Wind Systems A/S Hedeager 44 . 8200 Aarhus N . Denmark Tel.: +45 9730 0000 . Fax: +45 9730 0001 vestas@vestas.com . vestas.com

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