说明：  基于变桨距PID控制器的风力发电模型。仿真环境matlab->simulink。特点：随机风速模型；桨距恒功率控制；通俗易懂的PID控制器
(Variable pitch wind model based PID controller. Simulation environment matlab-> simulink. Features: Random velocity model pitch constant power control straightaway PID controller)