Abstract
Large wind turbine control performance is restricted due to a host of intrinsic feedback limitations including low frequency structural modes and slow blade pitch rate. A variable loop transmission system applied to a multiple output controller smoothly transitions the limited feedback available between channels in realtime to enhance performance. This work is focused on the stability analysis of a variable loop transmission system applied to a 1.5 MW wind turbine. Simulation results illustrate interesting challenges to compensator design in the form of more sophisticated loop shaping required to satisfy conditions of absolute stability.
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