SYSTEM AND METHOD FOR APPLYING A PITCH MOTOR BRAKING TORQUE TO A WIND TURBINE ROTOR BLADE

A system and method are provided for applying a pitch motor braking torque to a rotor blade. Accordingly, of the pitch control system from a 1st operational mode to an emergency operational mode is initiated. The pitch motor of the pitch control system having an absence of supply current during the transition. A short-circuit is established across the Armature of the pitch motor so as to establish a current flow. The current is generated by the pitch motor in response to rotation of the rotor blade about the pitch axis when the pitch motor has the absence of supply current. In response to the current flow being generated, generating a braking torque in a single direction with the pitch motor so as to allow the rotor blade to move freely to a lesser loaded orientation relative to an original orientation to protect the wind turbine from damage. 提供用于向转子叶片施加变桨马达制动转矩的系统和方法。相应地，启动变桨控制系统从第1操作模式向紧急操作模式的过渡。变桨控制系统的变桨马达在过渡期间不具有供应电流。横跨变桨马达的电枢建立短路，以便建立电流流动。当变桨马达不具有供应电流时，由变桨马达响应于转子叶片围绕变桨轴线的旋转来生成电流。响应于生成的电流流动，用变桨马达生成沿单个方向的制