Model Based Control of Wind Turbines: Look-Ahead Approach

A new composite turbine control architecture that consists of feedforward and feedback parts based on the upwind speed measurements and wind speed measurements at the turbine site, respectively, is described. The algorithm starts with preprocessing of a low rate sampled upwind speed via spline interpolation method. A run-ahead model driven by the signals from a preprocessing block models the turbine response and produces the feedforward part of turbine controller. The turbine control system is driven by both feedforward part which comes from the run-ahead model, and feedback part based on the wind speed measured at the turbine site. It is proved that the controller is stable despite the difference between the time shifted preview measurements (expected wind speed) and actual wind speed measured at the turbine site. Existing industrial PI/PID turbine controllers can easily be upgraded with the preview part of the control architecture described in this paper. Improved blade load regulation via the blade pitch angle control guarantees a hard upper bound on the flapwise bending moment. The results are confirmed by simulation with a wind speed record from the Hono turbine outside Gothenburg, Sweden.

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