A control method for low voltage ride through comprises the following steps: 1)A control circuit (9) monitors a DC bus voltage of a set of frequency converters (3, 4) connected between a wind generator rotor and a power grid (12) and a voltage of the power...

The invention provides a reactive voltage control system and a reactive voltage control method for a wind power field of the double-fed wind power-generating unit. The system comprises dispatching center equipment, a power management module for the wind po...

The present invention relates to a universal precise leveling measuring device and a measurement method thereof, comprising: a plate-shaped horizontal base, a round bubble level set at the center of an upper surface of the base, and three outriggers set on...