PARTIAL-LOAD DE-RATING FOR WIND TURBINE CONTROL

摘要

Methods, controllers and computer program products for controlling a wind turbine. Under de-rated operating conditions in which the power requested from a wind turbine is less than the available power, a controller adjusts blade pitch of the wind turbine to reduce the rotor power coefficient. The captured wind power is thereby reduced to be approximately equal to the requested electrical power, which is less than either the available power or the rated power of the wind turbine generator. This reduction in captured power provides the controller with an additional degree of freedom that allows the controller to increase the electrical power output of the wind turbine in response to wind fluctuations without damaging the wind turbine. By allowing increases in power under de-rated conditions, the controller may reduce the amount of pitching necessary to prevent the turbine from exceeding its rated power output level.

主权项

1. A method of controlling a wind turbine, the method comprising:
receiving a power reference signal in a wind turbine controller that defines a requested power output level lower than an available power level; setting a blade pitch of a rotor of the wind turbine based on the received power reference signal that causes the rotor to capture wind power that is approximately equal to the requested power output level; and controlling the output power level of the wind turbine to the requested power output level by adjusting a load torque provided to the rotor by a generator coupled to the rotor.