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Supervised by Ministry of Industry and Information Technology of The People''s Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Process Modeling and Control Simulation for a 500W@4.5K Helium Refrigerator
Author NameAffiliationE-mail
Xiao Fei Lu Institute of Plasma Physics,Chinese Academy of Sciences,Hefei,China 
Zhiwei Zhou Institute of Plasma Physics,Chinese Academy of Sciences,Hefei,China  
Ming Zhuang Institute of Plasma Physics,Chinese Academy of Sciences,Hefei,China  
Lilong Qiu Institute of Plasma Physics,Chinese Academy of Sciences,Hefei,China  
In order to investigate dynamic behaviors of a 500W@4.5K helium refrigerator, the process simulator has been completed. The cryogenic process model is described and main components are customized. The real-time communication between the process model and the control system has been achieved. Compared with the preliminary experimental data, the errors of temperatures during the process of 300 K-80 K are less than 10%. The process model is validated to predict the cool-down process very well. The controller parameters are tuned in simulation and applied to the actual refrigerator suitably. Based on the dynamic simulation, the operation of Joule-Thomson (JT) bypass valve has been optimized. And the cool-down process from 300 K to 4.5 K has been simulated under the control programs. Simulation results indicate that this dynamic simulator based on actual control architecture is available to process control and operation optimization for the helium refrigerators.
Key words:  Helium refrigerator  Process simulation  Controller tuning  Operation optimization  Virtual commissioning
Clc Number:TB69; TL62