Fault tolerant system based on non-integers order observers: Application in a heat exchanger

M Alegría-Zamudio; R F Escobar-Jiménez; J F Gómez-Aguilar

doi:10.1016/j.isatra.2018.06.007

Fault tolerant system based on non-integers order observers: Application in a heat exchanger

ISA Trans. 2018 Sep:80:286-296. doi: 10.1016/j.isatra.2018.06.007. Epub 2018 Jun 22.

Authors

M Alegría-Zamudio¹, R F Escobar-Jiménez², J F Gómez-Aguilar³

Affiliations

¹ Posgrado del Tecnológico Nacional de México/CENIDET, Int. Internado Palmira S/N, Palmira, C.P.62490, Cuernavaca, Morelos, Mexico.
² Tecnológico Nacional de México/CENIDET, Int. Internado Palmira S/N, Palmira, C.P.62490, Cuernavaca, Morelos, Mexico. Electronic address: esjiri@cenidet.edu.mx.
³ Conacyt-Tecnológico Nacional de México/CENIDET, Int. Internado Palmira S/N, Palmira, C.P.62490, Cuernavaca, Morelos, Mexico.

PMID: 29937091
DOI: 10.1016/j.isatra.2018.06.007

Abstract

This work presents a fault-tolerant (FT) scheme based on the application of non-integer order observers also called fractional observers, the case of study is a double pipe countercurrent heat exchanger (HE). The aim of the FT is to detect sensors faults as soon as possible, and to provide a healthy signal in order to replace the faulty sensor signal by the fractional observer estimation. To develop the FT scheme a bank of high gain fractional order observers (HGFOO) is proposed. The Riemann-Liouville (RL) fractional derivative definition is used to solve each fractional observer. Experimental measures from a HE were used to test the performance of the fractional observers and the control scheme. The results show the robustness of the proposed observers.

Keywords: Fault diagnosis and isolation; Fault tolerant system; Fractional observers; Heat exchangers; High-gain observers.