Patent ID: 8247917

Claim:
An output control method for a wind power plant in which a wind turbine generator and a storage battery unit are connected to a grid in parallel via a grid interconnection part, the method comprising the steps of: calculating total active power and total reactive power to be supplied to the grid from the wind power plant based on voltage information and current information which are detected at a grid connecting end of the wind power plant, and switching an operation mode selectively between: a first operation mode in which the wind turbine generator outputs wind turbine required active power and wind turbine required reactive power which match an upper limit that is outputted by the wind turbine generator and the storage battery unit outputs storage battery required active power and storage battery required reactive power which, respectively, correspond to a difference between the total active power and the wind turbine required active power and a difference between the total reactive power and the wind turbine required reactive power, respectively, within an allowable range of the total active power and the total reactive power; and a second operation mode in which the storage battery required active power is maintained and the storage battery required reactive power is reduced while the wind turbine reactive power is increased by an amount of the reduction of the storage battery required reactive power in such a case that apparent power based on the storage battery required active power and the storage battery required reactive power exceeds a setting apparent power of the storage battery unit in the first operation mode.