Method for Optimizing a Wind Power Installation

A wind power installation arrangement comprising at least one test wind power installation and a comparison wind power installation, prepared to assess the test wind power installation, wherein the wind power installation arrangement is prepared to carry out an assessment method, wherein a comparison is made between the at least one test wind power installation and the comparison wind power installation, and the assessment method comprises:

• synchronously operating the test wind power installation and the comparison wind power installation in an adjustment interval in an adjustment mode, in which the test wind power installation and the comparison wind power installation have matching operating settings,
• synchronously recording performance data relating to the test wind power installation and the comparison wind power installation installations in the adjustment interval in the adjustment mode;
• modifying at least one of the test wind power installation and the comparison wind power installation in a modification step such that the test wind power installation and the comparison wind power installation differ from one another;
• synchronously operating the test wind power installation and the comparison wind power installation, which differ from one another, at least in a comparison interval in a comparison mode;
• synchronously recording performance data in the comparison mode;
• and
• evaluating the performance data recorded in the adjustment mode and the comparison mode.