Simultaneous estimation of wind shears and misalignments from rotor loads: formulation for IPC-controlled wind turbines

In this paper, the turbine itself is used as an anemometer to estimate the inflow at its rotor disk. Indeed, given that any anisotropy in the wind will lead to periodic loads, by studying the machine response one can infer rotor-effective wind conditions and exploit such information for turbine and farm-level control applications. Specifically, expanding the idea of previous publications, the case of an individually pitch-controlled machine is considered herein: a linear implicit model is formulated to relate some characteristics of the wind —in the form of shears and misalignment angles— to the 1P harmonics of pitch angles and blade loads. The performance of the proposed algorithm is tested in a simulation environment, including both uniform and turbulent wind conditions.