In this study, mathematical modeling of an ohmic heating system has been done, firstly. Then, two different control approaches, PID and fuzzy logic control, have been considered to control of mathematically modeled ohmic heating system. An optimal PID controller has designed based on Ziegler-Nicholas method. In order to make a comparison, a fuzzy logic controller (FLC) has also been designed and obtained results have been compared, finally. Based on the obtained results, FLC has showed more powerful, stable and convenient control action to control of an ohmic heating system. Applying designed FLC, it can be concluded that the ohmic heating system behavior is more stable and has less settling time with no overshoot have been observed.

Keywords - Fuzzy, PID, FLC, Fuzzy Logic Control, Ohmic Heating

[1] B. Bansal and X. Chen, “Effect of temperature and power frequency on milk fouling in an ohmic heater,” Food Bioproducts Process., vol. 84, pp. 286–291, no. 4, 2006.

[2] F. Jones, “Apparatus for electrically treating liquids,” U.S. Patent 592 735, Oct. 26, 1897.

[3] R. Bengtson, E. Birdsall, S. Feilden, S. Bhattiprolu, S. Bhale, and M. Lima, “Ohmic and inductive heating,” Food Scıence And Technology-New York-Marcel Dekker-, vol. 149, no. 3, 120, 2006.

[4] F. Icier, “Ohmic heating of fluid foods,” Novel thermal and non-thermal technologies for fluid foods, pp. 305-367, 2012.

[5] M. Bertolini and G. Romagnoli, “An Italian case study for the Process-Target-Cost evaluation of the ohmic treatment and aseptic packaging of a vegetable soup (minestrone),” Journal of food engineering, vol. 110, no. 2, pp. 214-219, 2012.

[6] C. P. Samaranayake, S. K. Sastry, and H. Zhang, “Pulsed ohmic heating: A novel technique for minimization of electrochemical reactions during processing,” J. Food Sci., vol. 70, no. 8, pp. e460–e465, 2006.

[7] A. Chandra, and B. Bagchi, “Frequency dependence of ionic conductivity of electrolyte solutions,” J. Chem. Phys., vol. 112, no. 4, pp. 1876–1886, 2000.

[8] M. Lima, B. F. Heskitt, and S.K. Sastry, “The effect of frequency andwave form on the electrical conductivity-temperature profiles of turnip tissue,” J. Food Process. Eng., vol. 22, no. 1, pp. 41–54, Apr. 1999

[9] J. Morren, B. Roodenburg, and S.W. de Haan, “Electrochemical reactions and electrode corrosion in pulsed electric field (PEF) treatment chambers,” Innov. Food Sci. Emerg. Technol., vol. 4, no. 3, pp. 285–295, 2003.

[10] M. F. D. Ramos and H. E. Tacca, “Ohmic heating of food by means of high frequency power inverters,” in Proc. 15th Eur. Conf. Power Electron. Appl., Sep. 2013, pp. 1–10.

[11] A. Toudeshki, N. Mariun, H. Hizam, S. M. Bashi, and H. Jamaludin, “Variable high frequency voltage source for an ohmic heating process,” in Proc. IEEE 2nd Int. Power Energy Conf., Dec. 2008, pp. 594–598.

[12] S. Ghnimi, N. Flach-Malaspina, M. Dresch, G. Delaplace, and J. Maingonnat, “Design and performance evaluation of an Ohmic heating unit for thermal processing of highly viscous liquids,” Chem. Eng. Res. Des., vol. 86, no. 6, pp. 626–632, 2008.

[13] D. Wenyan and J. Lu, “Design on ohmic heating sterilization device for food based onAVRmicrocontroller,” in Proc. 4th Int. Conf. Intell. Comput. Technol. Autom., vol. 2, Mar. 2011, pp. 51–53.

[14] T. Mannen and H. Fujita, “A DC capacitor voltage control method for active power filters using modified reference including the theoretically derived voltage ripple,” IEEE Trans. Ind. Appl., vol. 52, no. 5, pp. 4179– 4187, Sep./Oct. 2016.

[15] K. S. Varghese, M. C. Pandey, K. Radhakrishna, and A. S. Bawa, “Technology, applications and modelling of ohmic heating: A review,” J. Food Sci. Technol., vol. 51, no. 10, pp. 23-042317, Oct. 2014.

[16] M. Sack, J. Ruf, M. Hochberg, D. Herzog, and G. Mueller, “A device for combined thermal and pulsed electric field treatment of food,” in Proc. Int. Conf. Optim. Elect. Electron. Equip., Int. Aegean Conf. Elect. Mach. Power Electron., May 2017, pp. 31–36.

[17] P. J. Skudder and R. Stirling, "The commercial development of ohmic heating processes," in Advanced Food Technology, IEE Colloquium on, pp., May 1992, 3/1-3/2.

[18] F. Icier and C. Ilicali, “Temperature dependent electrical conductivities of fruit purees during ohmic heating,” Food Res. Int., vol. 38, no. 10, pp. 1135–1142, 2005.

[19] S. Sarang, S. K. Sastry, and L. Knipe, “Electrical conductivity of fruits and meats during ohmic heating,” J. Food Eng., vol. 87, no. 3, pp. 351–356, 2008.