Systematic Errors in the Measurement of the Aerodynamic Performance of a WECS by the Method of Bins

摘要

The systematic errors that may be obtained in determining the power (or torque) performance curve of a wind energy conversion system by the method of bins are discussed. Errors are due to lack of correlation of wind speeds, either in time due to dynamic effects (for which correction by measurement is possible), or in space (which can be allowed for by a computed correction). The way of measurement and analysis are discussed in some detail. A theory is given on how to calculate the systematic errors quantitatively. Recommendations are given for keeping the errors as small as possible. For the situation that errors can not be made negligible a method is developed to correct the performance curve, using only the experimental data. The alternative inverse method of bins is shown to produce errors in the opposite direction and to have some advantages under certain circumstances. The theory has been confirmed in a satisfactory way by experiments in a 15 m vertical axis wind turbine and a 25 m horizontal axis wind turbine. (ERA citation 09:032999)