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最优PI控制器整定需要传递函数模型,且强调模型-90°在相位处的准确性。满足这种要求的模型化方法是应用PI控制器最优整定的关键步骤。为此,本文提出了一种基于双通道继电测试TRFT的相位相关闭环频域辨识策略。在该方法中,首先通过TRFT以闭环方式提取在指定相位的多点频率特性;其次,采用所提出的RNLS频域辨识算法估计过程对象的带有时滞的传递函数模型。最后的仿真取得了令人满意的结果,验证了所提出方法的有效性。本文所提出的建模方法与最优整定相结合构成了一个完整的工业应用框架。
The optimal PI controller tuning requires a transfer function model and emphasizes the accuracy of the model -90 ° phase. The modeling approach to meet this requirement is a key step in applying optimal PI controller tuning. To this end, this paper presents a phase-dependent closed-loop frequency domain identification strategy based on two-channel relay test TRFT. In this method, the multi-point frequency characteristics in the specified phase are first extracted by closed-loop method using TRFT. Secondly, the proposed transfer function model with time delay is estimated by using the proposed RNLS frequency domain identification algorithm. The final simulation has achieved satisfactory results, verifying the effectiveness of the proposed method. The proposed modeling method combined with optimal tuning constitutes a complete industrial application framework.