基于频域和时域的内模PI控制器性能评价与参数优化  

Performance assessment and parameter optimization of an internal model PI controller in frequency and time domains

作　　者：李士哲[1] 刘畅 LI Shizhe;LIU Chang(School of Control and Computer Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学控制与计算机工程学院,河北保定071003

出　　处：《河北大学学报（自然科学版）》2022年第5期530-541,共12页Journal of Hebei University(Natural Science Edition)

基　　金：深圳市可持续发展科技专项项目(KCXFZ20201221173402007)。

摘　　要：由于控制系统的性能降低通常与比例积分(proportion integration,简称PI)控制器不合理的参数有关,而且单一的时域性能评价指标不准确,因此,针对具有纯迟延特性的控制对象,给出了基于频域和时域相结合的性能评价方法,克服了单一性能指标的不准确性.在不同控制策略和参数下,分析了系统性能指标与基准曲线或基准点的距离.针对2个典型的高阶被控过程,分别给出了不同的降阶模型,并把拟合对象特性最好的模型用于内模PI控制器的设计.基于频域和时域评价的结果,给出了PI控制器参数重新优化和整定的方法,用于改善控制系统的性能,该方法通过数据驱动方法对参数进行重新整定来实现,提高了运算效率.仿真实验验证了上述性能评价和参数优化方法的有效性.Because the performance degradation of the control system is usually related to the unreasonable parameters of the PI controller,and the single performance assessment index in time domain is not accurate,therefore a performance assessment method based on the combination of frequency domain and time domain is presented for the control object with pure delay characteristic,which overcomes the inaccuracy of a single performance metric.Under different control strategies and parameters,the distance between the system performance index and the reference curve or reference point is analyzed.For two typical high-order processes,different reduced-order models are given,and the model with the best fitting characteristics is applied to the design of internal model PI controller.Based on the results of frequency-domain and time-domain assessment,a method of re-optimizing and tuning the parameters of PI controller is presented,which is used to improve the performance of the control system,and it is realized by re-setting the parameters through the data-driven method.The structure is simple,and the operation efficiency is improved.The simulation results verify the effectiveness of the above methods.

关 键 词：性能评价 PI控制器 频域指标 时域指标 参数优化 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]