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Title: Physical control oriented model of large scale refrigerators to synthesize advanced control schemes. Design, validation, and first control results

Abstract

In this paper, a physical method to obtain control-oriented dynamical models of large scale cryogenic refrigerators is proposed, in order to synthesize model-based advanced control schemes. These schemes aim to replace classical user experience designed approaches usually based on many independent PI controllers. This is particularly useful in the case where cryoplants are submitted to large pulsed thermal loads, expected to take place in the cryogenic cooling systems of future fusion reactors such as the International Thermonuclear Experimental Reactor (ITER) or the Japan Torus-60 Super Advanced Fusion Experiment (JT-60SA). Advanced control schemes lead to a better perturbation immunity and rejection, to offer a safer utilization of cryoplants. The paper gives details on how basic components used in the field of large scale helium refrigeration (especially those present on the 400W @1.8K helium test facility at CEA-Grenoble) are modeled and assembled to obtain the complete dynamic description of controllable subsystems of the refrigerator (controllable subsystems are namely the Joule-Thompson Cycle, the Brayton Cycle, the Liquid Nitrogen Precooling Unit and the Warm Compression Station). The complete 400W @1.8K (in the 400W @4.4K configuration) helium test facility model is then validated against experimental data and the optimal control of both the Joule-Thompson valvemore » and the turbine valve is proposed, to stabilize the plant under highly variable thermals loads. This work is partially supported through the European Fusion Development Agreement (EFDA) Goal Oriented Training Program, task agreement WP10-GOT-GIRO.« less

Authors:
;  [1];  [2]
  1. INAC, SBT, UMR-E 9004 CEA/UJF-Grenoble, 17 rue des Martyrs, 38054 Grenoble (France)
  2. Gipsa-Lab, Control Systems Department, CNRS-University of Grenoble, 11, rue des Mathématiques, BP 46, 38402 Saint Martin d'Hères (France)
Publication Date:
OSTI Identifier:
22262748
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1573; Journal Issue: 1; Conference: Cryogenic engineering conference, Anchorage, AK (United States), 17-21 Jun 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BRAYTON CYCLE; COOLING SYSTEMS; DESIGN; HELIUM; ITER TOKAMAK; LIQUIDS; OPTIMAL CONTROL; REFRIGERATORS; TEST FACILITIES; TURBINES

Citation Formats

Bonne, François, Bonnay, Patrick, and Alamir, Mazen. Physical control oriented model of large scale refrigerators to synthesize advanced control schemes. Design, validation, and first control results. United States: N. p., 2014. Web. doi:10.1063/1.4860897.
Bonne, François, Bonnay, Patrick, & Alamir, Mazen. Physical control oriented model of large scale refrigerators to synthesize advanced control schemes. Design, validation, and first control results. United States. https://doi.org/10.1063/1.4860897
Bonne, François, Bonnay, Patrick, and Alamir, Mazen. 2014. "Physical control oriented model of large scale refrigerators to synthesize advanced control schemes. Design, validation, and first control results". United States. https://doi.org/10.1063/1.4860897.
@article{osti_22262748,
title = {Physical control oriented model of large scale refrigerators to synthesize advanced control schemes. Design, validation, and first control results},
author = {Bonne, François and Bonnay, Patrick and Alamir, Mazen},
abstractNote = {In this paper, a physical method to obtain control-oriented dynamical models of large scale cryogenic refrigerators is proposed, in order to synthesize model-based advanced control schemes. These schemes aim to replace classical user experience designed approaches usually based on many independent PI controllers. This is particularly useful in the case where cryoplants are submitted to large pulsed thermal loads, expected to take place in the cryogenic cooling systems of future fusion reactors such as the International Thermonuclear Experimental Reactor (ITER) or the Japan Torus-60 Super Advanced Fusion Experiment (JT-60SA). Advanced control schemes lead to a better perturbation immunity and rejection, to offer a safer utilization of cryoplants. The paper gives details on how basic components used in the field of large scale helium refrigeration (especially those present on the 400W @1.8K helium test facility at CEA-Grenoble) are modeled and assembled to obtain the complete dynamic description of controllable subsystems of the refrigerator (controllable subsystems are namely the Joule-Thompson Cycle, the Brayton Cycle, the Liquid Nitrogen Precooling Unit and the Warm Compression Station). The complete 400W @1.8K (in the 400W @4.4K configuration) helium test facility model is then validated against experimental data and the optimal control of both the Joule-Thompson valve and the turbine valve is proposed, to stabilize the plant under highly variable thermals loads. This work is partially supported through the European Fusion Development Agreement (EFDA) Goal Oriented Training Program, task agreement WP10-GOT-GIRO.},
doi = {10.1063/1.4860897},
url = {https://www.osti.gov/biblio/22262748}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1573,
place = {United States},
year = {Wed Jan 29 00:00:00 EST 2014},
month = {Wed Jan 29 00:00:00 EST 2014}
}