Patent ID: 7826988

Claim:
A method for determining an adapted characteristic curve ( 9 ) for an electric variable selected from the group consisting of (P el , Q, φ, cos φ, I p , and I Q ) of a wind energy plant ( 1 ), wherein the characteristic curve ( 9 ) contains characteristic values of the electric variable selected from the group consisting of (P el , Q, φ, cos φ, I p , and I Q ) depending on different values of a wind (v w ), comprising the steps of: measuring at least one characteristic value of the electric variable of the group consisting of (P el , Q, φ, cos φ, I p , and I Q ) for at least one value of the wind (v w ) using a measuring device ( 3 ); adapting for the at least one value of the wind (v w ), a characteristic value of the electric variable selected from the group consisting of (P el , Q, φ, cos φ, I p , and I Q ) from a predetermined characteristic curve ( 7 ), containing characteristic values of the electric variable selected from the group consisting of (P el , Q, φ, cos φ, I p , and I Q ) as a function of different values of the wind (v w ), taking into account the characteristic value measured for the at least one value of the wind (v w ), to obtain the adapted characteristic curve ( 9 ); further characterised in that the number (n) of the characteristic values of the electric variable selected from the group consisting of (P el , Q, φ, cos φ, I p , and I Q ) measured for one value of the wind (v w ) is established and the adaptation of the characteristic value is performed depending on the number (n) of the measured characteristic values measured for the respective value of the wind (v w ), and further characterised in that the characteristic value of the predetermined characteristic curve ( 7 ) and the at least one measured characteristic value are weighted in a calculation of the adapted characteristic value, provided that the number (n) of the characteristic values of the electric variable selected from the group consisting of (P el , Q, φ, cos φ, I p , and I Q ) measured for the respective value of the wind (v w ) is below a limit number.