USE OF STATE-SPACE MODELING TO EVALUATE AND CONTROL THE MODE SHAPES OF A LARGE-SCALE WIND TURBINE

Eduardo José Novaes Menezes¹; Pedro Manuel González del Foyo¹; Alex Maurício Araújo¹

¹ Departamento de Engenharia Mecânica, Universidade Federal de Pernambuco

Baixar PDF doi:10.20906/CPS/CBA2018-0232

Resumo

In this paper, an application of control-structure interaction is presented. The wind turbines are complex systems, subjected to random wind loads, and with large and flexible components. One of the main functions of pitch control system is to regulate rotor speed in rated operation conditions and mitigate the dynamic loads in the mode shapes of the turbine. However, as a flexible structure, the characterization of the mode shapes influences in the aerodynamic forces on the rotor blades, changing also the rotor speed characteristics. In this regard, the mode shapes behavior can provoke instability in rotor speed control, due to the coupled dynamics. In this work, a state-space modeling is pro-posed to identify which are the problematic mode shapes and to cope with the wind turbine fully-coupled dynamics.

Palavras-chave: Wind turbines; Structural dynamics; State-space control; mode shapes