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提出了一种基于频域响应特性的模型辨识方法,通过获取对象的输入输出数据,快速找到其重要频率段,分析频率段内的频率响应,进而辨识出二阶加纯滞后模型,并基于模型和幅相裕度确定PID参数。利用上述方法,基于SIMATIC PCS7系统平台对工业中的高阶大滞后对象–换热器进行辨识并实施温度控制。应用结果表明,该辨识方法拟合度高,整定出的PID参数具有良好的控制效果和鲁棒性。
A model identification method based on frequency domain response characteristics is proposed. By acquiring the input and output data of an object, finding its important frequency segment quickly and analyzing the frequency response in the frequency segment, and then identifying the second-order plus-lag model based on the model And the phase margin to determine the PID parameters. Based on the SIMATIC PCS7 system platform, a high-level lag object in the industry, the heat exchanger, is identified and temperature-controlled using the above method. The application results show that the identification method has a good fitting degree and the set PID parameters have good control effects and robustness.