风电机组控制系统中PI控制器较多，需要辨识各PI控制器的参数。
PI controller is widely used in wind turbine control system and its parameters need to be identified.
在详细分析偏航控制系统控制要求的基础上，采用单片机89c51作为主控单元，设计了风电机组的偏航控制系统。
On the basis of analyzing the control process completely, the thesis designs yaw control system for WTGs using 89c51 single-chip computer as a main control unit.
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