Abstract: A yaw control system for a wind turbine generator includes a yaw direction sensor for detecting a yaw direction value of the nacelle at a current time, a yaw rotation amount calculation part for calculating an amount of yaw rotation of the nacelle in a predetermined period of time based on a yaw rotation speed and a yaw rotation time of the nacelle, a yaw direction estimation part for calculating an estimate value of a yaw direction of the nacelle at an end point of the predetermined period by an estimate value calculation logic based on the amount of yaw rotation in the predetermined period calculated by the yaw rotation amount calculation part and the yaw direction value at a starting point of the predetermined period, and a yaw drive control part for controlling the yaw drive mechanism.

Abstract: An output control device for a wind farm which includes n number of wind turbines includes a WTG output obtaining unit for obtaining a current output Pi of each of the wind turbines; an extractable output calculation unit for calculating an extractable output Pmaxi for each of the wind turbines; a potential output calculation unit for calculating a potential output Ppoti of each of the wind turbines based on a difference between the extractable output Pmaxi and the current output Pi of each of the wind turbines; and a WTG output determination unit for determining an output command value of each of the wind turbines so that a total output PWF of the wind farm becomes closer to an output target value PWF*. The WTG output determination unit assigns an output increase amount to each of the wind turbines and to determine the output command value.

Abstract: Provided are a yaw control system and a yaw control method for a wind turbine generator, which are capable of obtaining an accurate value of the yaw direction even when the yaw direction sensor is abnormal.

Abstract: An output control device for a wind farm which includes n number of wind turbines includes a WTG output obtaining unit for obtaining a current output Pi of each of the wind turbines; an extractable output calculation unit for calculating an extractable output Pmaxi for each of the wind turbines; a potential output calculation unit for calculating a potential output Ppoti of each of the wind turbines based on a difference between the extractable output Pmaxi and the current output Pi of each of the wind turbines; and a WTG output determination unit for determining an output command value of each of the wind turbines so that a total output PWF of the wind farm becomes closer to an output target value PWF*. The WTG output determination unit assigns an output increase amount to each of the wind turbines and to determine the output command value.

Abstract: An output control apparatus for a wind turbine, including an output difference calculation unit; a maximum output rate setting unit; an output command value calculation unit; and an output control unit, wherein the maximum output rate setting unit is configured so that the larger an absolute value of the difference is, the higher the maximum output rate is set at least in a range that the absolute value of the difference is not greater a threshold value.

Abstract: Provided are a control-amount separating section that separates, when it is determined that an interconnection-point voltage (Vr) at an interconnection point where a wind turbine is connected to a utility grid deviates from a target value, a target control amount for reactive power for matching the interconnection-point voltage (Vr) with the target value into a first control amount serving as a control amount for reactive power that is caused by a fluctuation in active power at the interconnection point and a second control amount serving as a control amount for reactive power that is caused by a change in a power flow in the utility grid; a wind-turbine control device that controls the switching device on the basis of the first control amount; and a capacitor-bank control device that controls the capacitor bank on the basis of the second control amount.

Abstract: An object is to suppress an output power reduction of a wind turbine generator system caused by a drop in the wind speed while the output power is being reduced according to an output-power reduction demand. When the output-power reduction demand to reduce the output power at an interconnection point to a predetermined output-power limit value is notified from a utility grid side, priorities are set such that higher priorities are given to wind turbines whose output powers are larger, and a preset minimum output-power value is set in output power commands for the wind turbines sequentially in descending order of priority, until the output power at the interconnection point reaches the output power limit value.

Abstract: An output control apparatus for a wind turbine, including an output difference calculation unit; a maximum output rate setting unit; an output command value calculation unit; and an output control unit, wherein the maximum output rate setting unit is configured so that the larger an absolute value of the difference is, the higher the maximum output rate is set at least in a range that the absolute value of the difference is not greater a threshold value.

Abstract: An object is to suppress an output power reduction of a wind turbine generator system caused by a drop in the wind speed while the output power is being reduced according to an output-power reduction demand. When the output-power reduction demand to reduce the output power at an interconnection point to a predetermined output-power limit value is notified from a utility grid side, priorities are set such that higher priorities are given to wind turbines whose output powers are larger, and a preset minimum output-power value is set in output power commands for the wind turbines sequentially in descending order of priority, until the output power at the interconnection point reaches the output power limit value.