Summary
This Chapter describes the concepts and basics of RC. The standard IM and the plug-in scheme structure are used to introduce the design, as well as stability and robustness approaches that are traditionally employed in this technique. The performance of the RC interface of frequency variations or uncertainty is analyzed using the magnitude response of the IM and the closed loop phase behavior of the system. These response characteristics evidence the dramatic loss of performance that occurs when the period of the reference/disturbance signal is time varying or uncertain. Section 2.1 introduces the IM, the controller structure, stability conditions and design criteria in RC, while in Section 2.2 the performance degradation under varying frequency conditions is analysed.
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Ramos, G.A., Costa-Castelló, R., Olm, J.M. (2013). Repetitive Control. In: Digital Repetitive Control under Varying Frequency Conditions. Lecture Notes in Control and Information Sciences, vol 446. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37778-5_2
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DOI: https://doi.org/10.1007/978-3-642-37778-5_2
Publisher Name: Springer, Berlin, Heidelberg
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