CONVERSION DEVICE FOR WINDMILL, CONTROL DEVICE FOR WINDMILL, METHOD FOR CONTROLLING CONVERSION DEVICE FOR WINDMILL

摘要

PROBLEM TO BE SOLVED: To allow a converter to be continuously operated by stabilizing power grid even if voltage drop of the power grid occurs.SOLUTION: A conversion device for a windmill has a grid voltage computation unit which determines a voltage state of power grid on the basis of information on a grid side voltage sensor and also has a reactive current command computation unit which outputs the reactive current command on the basis of information on a wind turbine control device WTC. The reactive current command computation unit is constituted so that the reactive current command outputted to the power grid in accordance with a voltage drop rate of the power grid is temporarily increased, and so that the follow-up time to a command value of the reactive current is changed.