Comparison of feedback and feed-forward control strategies on a water heater

Authors

  • László Richárd Tóth University of Pannonia, Faculty of Engineering, Department of Process Engineering, H-8200 Veszprém, Egyetem u. 10. , Pannon Egyetem, Folyamatmérnöki Intézeti Tanszék, 8200 Veszprém, Egyetem út 10.
  • Lajos Nagy University of Pannonia, Faculty of Engineering, Department of Process Engineering, H-8200 Veszprém, Egyetem u. 10. , Pannon Egyetem, Folyamatmérnöki Intézeti Tanszék, 8200 Veszprém, Egyetem út 10.
  • Ferenc Szeifert University of Pannonia, Faculty of Engineering, Department of Process Engineering, H-8200 Veszprém, Egyetem u. 10. , Pannon Egyetem, Folyamatmérnöki Intézeti Tanszék, 8200 Veszprém, Egyetem út 10.

Keywords:

IMC, constrained inverse, feed-forward, feedback

Abstract

In this work the control of a water-heating equipment with different control strategies was examined. The water flows through the device, while an electric heater raises its temperature. The outlet temperature is controlled by using the power of the heater as the manipulated variable. Measured disturbances are the flow rate and the inlet temperature. The aim of this work is to compare the abilities of control strategies based on feedback and on feed-forward. Two control strategies were tested, one based on a first principle model, and focusing on feed forward, the other based on black box modeling and focusing on feedback. The first approach was basically a constrained inverse controller, but embedded in an IMC structure, to compensate model errors. The second approach was a programmed adaptation with constrained PI controllers. We found that the feed-forward based controllers significantly outperformed the ones based on feedback. The controller performance was much better in simulation experiments, due to the absence of model error.

Author Biography

  • László Richárd Tóth, University of Pannonia, Faculty of Engineering, Department of Process Engineering, H-8200 Veszprém, Egyetem u. 10., Pannon Egyetem, Folyamatmérnöki Intézeti Tanszék, 8200 Veszprém, Egyetem út 10.

    corresponding author
    tothl@fmt.uni-pannon.hu

References

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Camacho, E. F., Rubio, F. R., Berenguel, M., Valenzuela, L. (2007b): A survey on control schemes for distributed solar collector fields. Part II: Advanced control approaches. Solar Energy, 81(10), 1252–1272. https://doi.org/10.1016/j.solener.2007.01.001

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Published

2011-12-12

Issue

Vol. 15 No. 3 (2011): Acta Agraria Kaposváriensis

Section

Articles

License

Copyright (c) 2011 Tóth László Richárd, Nagy Lajos, Szeifert Ferenc

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

How to Cite

Tóth, L. R., Nagy, L., & Szeifert, F. (2011). Comparison of feedback and feed-forward control strategies on a water heater. Acta Agraria Kaposváriensis, 15(3), 245-255. https://journal.uni-mate.hu/index.php/aak/article/view/7106

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