| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that a torque command for a generator cannot follow up a gusty wind, when suppressing variation in wind mill speed due to the gusty wind in a wind turbine generator.SOLUTION: A speed change rate of the rotational speed of a wind mill is detected. A change rate deviation of the detected speed change rate from a preset overspeed suppression start change rate is determined. The change rate deviation is input to an overspeed suppression torque calculation unit. The overspeed suppression torque calculation unit performs PI operation to generate an overspeed suppression torque when the change rate deviation>the overspeed suppression start change rate, but brings the overspeed suppression torque to zero when the change rate deviation<the overspeed suppression start change rate. The generated overspeed suppression torque is added, as a correction value, to a torque command from a wind mill controller, and the additional value serves as a torque command to a converter. |
