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Multivariable control of vapour compression refrigeration systems. 2. Controller design.

Author(s) : SCHURT L. C., HERMES C. J. L., TROFINO NETO A.

Summary

This paper introduces a multivariate linear control strategy acting simultaneously on the compressor speed and on the electric expansion valve opening for controlling the evaporator feeding and also for matching the cooling capacity to the thermal loads. Firstly, the dynamic simulation model developed and validated in the first part of the study was linearized according to a Taylor expansion series and then used to design the controller based on the linear-quadratic Gaussian (LQG) scheme using a Kalman filter for the estimator design. Experimental tests were also carried out in order to verify the controller ability of tracking a reference change and also of rejecting thermal load disturbances as high as 15%. In all cases, it has been found that the controller performed satisfactorily well not only for reference tracking but also for disturbance rejection. See also this Bulletin, reference 2009-1997.

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Pages: 2009-5

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Details

  • Original title: Multivariable control of vapour compression refrigeration systems. 2. Controller design.
  • Record ID : 2009-1998
  • Languages: English
  • Source: 3rd Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2009/06/23

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