The wind turbine generator of the impact load and impact load monitoring system monitoring method

The present invention relates to a load monitoring system for wind power generation by wind turbine impact load monitoring method and impact, impact load monitoring system having: an acceleration sensor (28), mounting up gear (18) on the spindle (20) coupled to; frequency filtering (30), from showing vibration data time-varying amplitude of acceleration by the acceleration sensor obtained in (28), extracts a monitoring target component frequency range monitoring target included; and determining means (32), the monitoring target component the amplitude of the acceleration with a preset reference value, and determines whether the amplitude of the acceleration exceeds the reference value.