Comparative analysis of decoupling control methodologies and H∞ multivariable robust control for VS-VP wind turbines

Wind turbines systems considered multivariable processes can work in several operational modes. Each mode can be represented with a dynamic model. This fact supposes a difficulty in controlling these types of systems. In addition, the models are subjected undesired interactions between variables. In this paper, different multivariable methodologies are proposed to deal with the previous problems when they are applied to a variable-speed variable-pitch wind turbine. Specifically, the proposed methods to be performed and compared are a multivariable robust control based on the H_∞ mixed sensitivity problem and multivariable control strategies with different decoupling networks.