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Etude de défauts critiques des installations solaires thermiques de grande dimension : définition, modélisation et diagnostic

Abstract : Large scale solar systems at low and medium temperature (80-120 °C) can provide renewable and competititve energy to district heating and industrial processes. These systems, which are capital-intensive and have low operating costs, present a long-term return on investment. Automated monitoring and fault detection and diagnosis are key elements to guarantee optimal performances during all the lifespan of the plant.This dissertation aims to analyze of the main faults, in a detection and diagnosis purpose. First, an exhaustive study of the dysfunctions that can affect the large scale solar systems enabled to identify the more frequent and serious faults, also called critical faults. Among these critical faults, six were selected for a more detailed study.To analyze the behavior of the system subjected to the studied faults, a numerical model was implemented. A new flat plate thermal solar collector model was particularly developed as existing ones do not detail enough several physical characteristics required for the reproduction of faults. An experimental validation of this model in normal and faulty operation showed that it enables a simple fault modelling and presents a realistic behavior.A methodology to numerically analyze the impact of the faults on the system behavior is then proposed. A set of features enabling the characterizing of this behavior are particularly defined. This approach is applied first at the scale of directly affected component then at system scale. The results enable to identify detectable and isolable faults, but also to propose a reduced set of features sufficient to properly detect and diagnose them.This work presents a methodologic base and first results to develop an automated algorithm for detection and diagnosis of critical faults of a large scale thermal solar system.
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https://tel.archives-ouvertes.fr/tel-02128473
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Submitted on : Tuesday, May 14, 2019 - 11:58:27 AM
Last modification on : Friday, October 23, 2020 - 5:00:37 PM

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Gaëlle Faure. Etude de défauts critiques des installations solaires thermiques de grande dimension : définition, modélisation et diagnostic. Energie électrique. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAT100⟩. ⟨tel-02128473⟩

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