Abstract:
Nysted Offshore Wind Farm was installed during 2003 and commissioned in December 2003. It consists of 72 wind turbines each of 2.3 MW, corresponding to a total of 165.6 MW installed power, which presently makes it the largest offshore wind farm of the world. The project was implemented on schedule and on budget by ENERGI E2 as operator. Ownership is shared between ENERGI E2, DONG and Sydkraft. The story of the first year of operation of Nysted Offshore Wind Farm is a story of very high availability, very high accessibility, well working boat landing, few turbine calls for manual intervention and production as predicted. It is the worlds largest offshore wind farm and results from the first year of operation have been waited with
much anxiety by many involved in offshore wind activities.
As the availability results of Chapter 4 indicate few problems and outstanding works have had to be completed after commissioning. The overall picture is satisfying with few outstanding works at final commissioning and moderate need for remedy of defects, and in addition a pleasing O&M situation. Two gearbox-bearings have in one working operation been replaced in all turbines. One is a high speed shaft bearing, the other an intermediate speed shaft bearing. The condition monitoring system reported increased vibration levels and thus forecasted problems. The gearbox-design was prepared for easy change of the two mentioned bearings, and it was decided to replace them in all turbines before breakdowns started costing serious availability loss. During July to mid October 2004 the change was carried out by means of the nacelle crane. The availability lost during the change of bearings was in average 48 hours per turbine at times of limited wind. A show-case that proves how a potentially very costly problem can be reduced to a small routine job if properly prepared for in design. The lightening protection system has worked almost perfectly. 3 strike-receptors per blade have caught all 10 lightening strokes so far, and no damage has occurred. The tip-receptor hit by the strongest current so far is shown in Figure 5, which looks dramatic, but where only a minor repair will be necessary – primarily of the paint.
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