Gil Martínez, MontserratRico Azagra, JavierElso Torralba, Jorge2019-07-012019-07-0120181563-514710.1155/2018/7531260https://academica-e.unavarra.es/handle/2454/33540The regulation of a disturbed output can be improved when several manipulated inputs are available. A popular choice in these cases is the series control scheme, characterized by (1) a sequential intervention of loops and (2) faster loops being reset by slower loops, to keep their control action around convenient values. This paper tackles the problem from the frequency-domain perspective. First, the working frequencies for each loop are determined and closed-loop specifications are defined. Then, Quantitative Feedback Theory (QFT) bounds are computed for each loop, and a sequential loop-shaping of controllers takes place. The obtained controllers are placed in a new series architecture, which unlike the classical series architecture only requires one controller with integral action. The benefits of the method are greater as the number of control inputs grow. A continuous stirred tank reactor (CSTR) is presented as an application example.14 p.application/pdfeng© 2018 Montserrat Gil-Martínez et al.This is an open access article distributed under the Creative Commons Attribution License,which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Frequency domain designControllersLoopsinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess