Effect of Offshore Turbulence on the Control of Spar Buoy Floating Wind Turbines

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  • Tipo de apresentação: Comunicação Oral
  • Eixo temático: 8.Pesquisa e Desenvolvimento
  • Palavras chaves: floating offshore wind turbine; Control; turbulence;
  • 1 UFABC - Universidade Federal do ABC

Effect of Offshore Turbulence on the Control of Spar Buoy Floating Wind Turbines

Roberto Luiz da Cunha Barroso Ramos

UFABC - Universidade Federal do ABC


Brazil has large potential for offshore wind power generation. According to a recent World Bank report, significant resources are located on deep waters, at water depths greater than 50 m, where the feasibility of fixed platforms is lower. Several types of floating platforms have been proposed and some systems have been installed at sea for testing under realistic environmental conditions. Among the floaters with good performance, there is the spar buoy platform, usually with catenary mooring lines, whose cylindrical hull with large draft reduces the heave motion in waves. Under high winds and turbulence, the aerodynamic control system of the wind turbine, using the collective blade pitch actuator, must limit the rotor speed variations and avoid excessive floater motions. Due to the rotor-floater coupled dynamics, the application of multivariable control techniques has been proposed by several authors, aiming at improving the system performance with respect to conventional PID (proportional-integral-derivative) controllers. However, the performance evaluation of those advanced controllers has been based on typical onshore turbulence conditions or standards mainly developed for structural design of the platforms. Works based on long-term measurements from offshore wind farms show that the mean turbulence intensities are generally lower than those adopted in the mentioned automatic control studies. This fact may affect the feasibility of the proposed advanced controllers, especially in rough sea states, which reduce the effectivity of the turbine aerodynamic control. This paper evaluates the performance of a linear quadratic regulator designed for the benchmark spar buoy floating offshore wind turbine OC3-Hywind, based on simulations under realistic offshore wind turbulence and sea state conditions. Simulation results show that optimal control with suitable tuning can reduce the rotor speed variations and floater pitch motion compared with PID control.

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