Wind turbine generator for use in cold weather, method of controlling the same, and wind turbine generating system for use in cold weather

A wind turbine generating system comprising:

• a switch gear for switching between connection and disconnection of the wind turbine generator and a utility grid, and
• a wind turbine generator comprising:
• a power supply unit connected to a utility grid via a switch gear;
• a utility grid voltage measuring unit provided between the power supply unit and the utility grid, for measuring a voltage of the utility grid;
• and
• a temperature measuring unit for obtaining an ambient temperature of the power supply unit;
• and
• an electric storage device for supplying power to the switch gear in a state where the connection between the utility grid and the power supply unit is interrupted, wherein
• in a case where a measurement value of the temperature measuring unit or an ambient temperature of the power supply unit estimated based on the measurement value is smaller than a first temperature threshold determined based on a function guarantee temperature of the power supply unit, where the voltage measured by the utility grid voltage measuring unit is smaller than a preset voltage threshold, and where a state where the voltage of the utility grid is less than the preset voltage threshold is maintained for a predetermined period, a determination that a power outage will occur is made, and the switch gear operates to interrupt the connection between the power supply unit and the utility grid, and
• the predetermined period is set based on a remaining capacity of the electric storage device.