A method of measuring windmill torque loss coefficients

The aim of this work is to investigate a method of measuring windmill torque loss coefficients of a windmill power system. We discussed the mathematical windmill model and defined the windmill torque loss coefficients. An estimating technique based on Kalman filtering was developed for decision of the value of these coefficients. We manifested the valdity of this method by the estimated results from both the simulated data and wind-tunnel experimental data.