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Effects of Initial Conditions on Transient Responses in Dynamic Simulation of FOWT
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초록
The IEC standard for onshore or offshore wind turbines requires additional dummy simulations (at least 5 s) for the transientresponses due to initial conditions. An increase in the dummy time causes a considerable increase in the computational cost considering multipledesign spirals with several thousand design load analysis cases. A time of 30 s is typically used in practical simulations for awind turbine designwith a fixed platform. However, 30 s may be insufficient for floating offshore wind turbines (FOWT) because the platforms have lower naturalfrequencies, and the transient responses will last much longer. In this paper, an initial condition application algorithm is implemented forWindHydro, and the appropriate dummy simulation time is investigated based on a series of dynamic simulations of a FOWT. As a result, it isfound that more than 300 s is required for the platform to have stationary motion after the initial transient responses for the FOWT under theconditions considered.
Abstract
The IEC standard for onshore or offshore wind turbines requires additional dummy simulations (at least 5 s) for the transientresponses due to initial conditions. An increase in the dummy time causes a considerable increase in the computational cost considering multipledesign spirals with several thousand design load analysis cases. A time of 30 s is typically used in practical simulations for awind turbine designwith a fixed platform. However, 30 s may be insufficient for floating offshore wind turbines (FOWT) because the platforms have lower naturalfrequencies, and the transient responses will last much longer. In this paper, an initial condition application algorithm is implemented forWindHydro, and the appropriate dummy simulation time is investigated based on a series of dynamic simulations of a FOWT. As a result, it isfound that more than 300 s is required for the platform to have stationary motion after the initial transient responses for the FOWT under theconditions considered.
참고문헌 (9)
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