Reconstruction of effective wind speed for fixed-speed wind turbines based on frequency data fusion

Abstract

The rotator of the wind turbine is subject to a spatially and temporally distributed wind field, the wind speed will vary significantly at different point over the blades plane. This makes a direct measurement of effective wind speed impossible. This paper analyzes the spectrum of the measurement of the anemometer and generator power of a wind turbine, and points out that the characteristics of these two signals are complementary in the frequency domain. An observer for effective wind speed has been proposed based on frequency-domain data fusion theory. The observer design is formulated as an mixed-sensitivity problem with LMIs. Simulations were carried out to assess the performance under a realistic wind speed profile. The simulation results show that the observer can not only guarantee the static accuracy, but also to improve the dynamic accuracy of the measurements of effective wind.