Common use of Power Curve test Clause in Contracts

Power Curve test. Prior to starting any measurement test the IE conducting the measurement test shall prepare and deliver a written test plan to the Parties that (i) identifies the TWT(s) and the final position for the reference met mast(s), including the corresponding free sector and site calibration requirements, and (ii) describes the type and characteristics of the measurement equipment and verification methodology that will be employed by the IE during and in connection with the Power Curve Test. The Power Curve test for each of the TWTs will be performed according to [Ref.1] only cup anemometers are allowed as main Reference Wind Speed Sensors. The Owner shall communicate the Supplier at 8 weeks in advance the date scheduled for the installation of the measurement sensors on the wind turbines and commencement of the measurement campaign. The Supplier must ensure the availability of the TWTs for power performance purposes on the scheduled date and will previously carry out all the actions and verifications that he may consider necessary prior to the commencement of the measurements, taking always into consideration that the status of the TWT will be representative of all the rest of wind turbines, and that any action must be also implemented in the rest of wind turbines, except in the case of blades cleaning. Special care shall be taken to ensure that the software control version implemented during the test is the same that the one in the rest of turbines and that the one in normal operation during the operation of the wind farm. The TWTs will not be subjected to any type of external limitation (limitation of active or reactive power, or other limitations) during the power curve measurement campaign. The Owner shall share with the Supplier the preliminary raw data of the campaign (at least two weeks of data) and optionally an interim report issued by the IE. The Supplier will review the data and confirm correctness of installation and recorded signals no later than 15 days from the date of the data sending. Should any problem be detected, it will be investigated and solved, and the campaign re-set. In order to compare the Measured Power Curve to the Warranted Power Curve in similar conditions, data will be filtered in accordance of the Validity Range of the Warranted Power Curve and no additional filters should be applied. If a Site Calibration has been conducted, first apply the calibration expressions and then apply all the Validity Range filtering in the estimated quantities at the Test Turbine position. As stated previously, cut-out hysteresis will not be considered for the calculation of the Extrapolated Measured Power Curve (EMPCi), meaning that all data sets where the TWT has stopped generating power due to cut-out at high wind speed shall be excluded. Also, the power curve shall capture the effect of hysteresis at the cut-in control algorithm, as well as the effect of parasitic losses below cut-in. The Measurement shall be considered to be completed when following conditions are reached: Data base to be based on a minimum recording time period of 180 hours, but preferably above 350 hours, for the range of wind speeds defined by the IEC61400-12-1. In addition to the requirements of IEC (3, 10-min datasets per bin), in the wind speed range extending from 1 m/s below cut-in to 1.5 times the wind speed at 85 % of the rated power of the wind turbine, a minimum of one hundred (100) minutes for each bin (10, 10-min datasets) is required to consider the measurement completed. If after 3 months from the official start of the campaign, the IEC requirements have been met, but not the additional requirements as to the number of total samples or per bin, the campaign may be terminated by mutual agreement, in light of the results, may request to continue the campaign until the number of samples requirements are completed, assuming the costs derived from the additional duration of the campaign. In any case, the limitation stated in section 4 regarding maximum test duration shall apply, provided that the minimum levels stated in this list are observed.