Patent ID: 8736094

Claim:
A wind-turbine-generator control system for a wind turbine generator that is interconnected to a utility grid and that generates power with a generator through rotation of a rotor having blades, comprising: a output-power command value creating unit for creating an output-power command value indicating a generated output power of the wind turbine generator; a output-power command value limiting unit for limiting the output-power command value by means of at least an upper limit value of the generated output power, the upper limit value being determined based on a relationship between the generated output power and the rotational speed of the generator; a limit-value creating unit for creating, when a grid frequency, which is a frequency of the utility grid, is increased above a predetermined reference frequency, a first limit value serving as an upper limit value of the output-power command value, according to the increase in the grid frequency; and a first upper-limit limiting unit for limiting the upper limit value of the output-power command value limited by the output-power command value limiting unit, by means of the first limit value created by the limit-value creating unit.