时变频率周期扰动系统的自适应重复控制

E. Kurniawan, Z. Cao, Z. Man
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引用次数: 29

摘要

重复控制(RC)被广泛用于跟踪/抑制周期信号。然而,RC本身不能跟踪任何非周期参考信号。需要另一种控制方案,如模型参考控制(MRC)或模型参考自适应控制(MRAC)来完成这一任务。当工厂参数已知时采用MRC,而当工厂参数未知时使用MRAC。因此,为了同时跟踪任意参考信号(不一定是周期性的)并抑制周期性干扰,MRC/MRAC需要与RC相结合。RC的设计大多假设扰动频率恒定,这就导致了采样周期的选择固定。实际上,干扰的频率可能是时变的。采样周期必须仔细调整,以保持每个周期的样本数量保持不变。采样周期的调整改变了设备参数。针对时变频率周期性扰动系统,提出了MRAC与RC相结合的设计方法。本文还初步探讨了MRC与RC相结合的结构设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Adaptive Repetitive Control of System Subject to Periodic Disturbance with Time-Varying Frequency
Repetitive Control (RC) has been widely used to track/reject periodic signal. However, RC alone fails to track any non-periodic reference signal. Another control scheme such as Model Reference Control (MRC) or Model Reference Adaptive Control (MRAC) is required to do such task. MRC is employed when the plant parameters are known, while MRAC is used when the plant parameters are unknown. Therefore, MRC/MRAC needs to be combined with RC in order to simultaneously track any reference signal (not necessarily periodic) and reject the periodic disturbance. The design of RC mostly assumes the constant frequency of disturbance which leads to the selection of a fixed sampling period. In practical, disturbance is possibly time-varying in frequency. The sampling period has to be carefully adjusted in order to keep the number of samples per period remains constant. This sampling period adjustments change the plant parameters. This paper proposes the design of MRAC combined with RC for system subject to periodic disturbance with time-varying frequency. As a preliminary, the design of MRC combined with RC is also discussed here.
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