数字PI控制器的参数辨识及实验验证

Parameter identification of digital PI controller and experiment validation

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。针对数字PI控制器,基于可辨识性理论,直接应用PI控制器不同状态的输入/输出数据,分析PI控制器参数的可辨识性,得到了其参数可唯一辨识的结论,并据此设计了PI参数辨识的具体算法。在此基础上,根据电机转速控制实验装置实测的数据,运用可辨识性分析步骤中的参数辨识算法,辨识得到高精确度的PI参数。在施加脉冲群干扰试验和振荡波干扰试验条件下,算法也能准确地辨识PI控制器参数,具有良好的鲁棒性,验证了理论分析的正确性和辨识方法的可行性。

PI controller is widely used in wind turbine control system and its parameters need to be identified.The identifiability of digital PI controller parameters is analyzed with its input and output data under different states,which shows that its parameters can uniquely be identified.The identification algorithm of PI controller parameters is designed,with which the precise PI parameters are identified based on the measured data of a machine speed control tester.Under the disturbance test conditions of pulse packet and oscillating wave,the algorithm identifies PI controller parameters correctly,showing its perfect robustness.The correctness of theoretical analysis and the feasibility of identification algorithm are validated.