Numerical Modeling of a Wind Turbine Blade Deflection Sensing System Using the Moving Frame FDTD Method

摘要

Moving frame finite-difference time-domain (MF-FDTD) method is applied to numerical modeling of a wind turbine blade deflection sensing system that uses an ultrawideband (UWB) wireless link along the blade. The moving frame in MF-FDTD follows the propagation of only relatively small important part of the UWB pulse and therefore brings substantial savings in simulation time compared to the original FDTD method operating on the entire blade. In this paper, concrete formulas for determining the extent of the moving frame are given, taking into account the effects of the numerical dispersion of the FDTD method on the UWB pulse extent. In the numerical experiment, the actual speedup for a simulation of a 58.7m long wind turbine blade is shown to be approx. 11.5×, reducing the running time from 17 to 1.5 hours.