说明：  以永磁体励磁多极直驱式同步风力发电机组(PMSG)为对象，建立了包括风力机模型、传动系统模型和发电机模型的D—PMsG数学模型，提出了风力机桨距角和发电机转速的控制策略
(A d-pmsg mathematical model including wind turbine model, transmission system model and generator model was established, and the control strategy of pitch Angle and generator speed was proposed)