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A fuzzy-split range control system applied to a fermentation process.

Rodolpho Rodrigues Fonseca¹, Jones Erni Schmitz, Ana Maria Frattini Fileti

¹School of Chemical Engineering, University of Campinas, Av. Albert Einstein 500, CEP 13083-970, Campinas, SP, Brazil.

Bioresource Technology

|June 14, 2013

Summary

A novel fuzzy-PI controller with split range control effectively regulates fermentation vat temperature. This system significantly reduces control effort by 84.5% and utility demand by 6.75% compared to traditional PI controllers.

Keywords:

Fermentation Fuzzy control Split range control

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Area of Science:

Process Control
Automation Engineering
Biotechnology

Background:

Fermentation processes require precise temperature regulation for optimal outcomes.
Conventional Proportional-Integral (PI) controllers may face limitations in complex dynamic systems.
Split range control strategies offer potential for improved performance in temperature regulation.

Purpose of the Study:

To evaluate the efficacy of a fuzzy-PI controller combined with a split range strategy for fermentation vat temperature control.
To compare the performance of the proposed fuzzy-PI system against a conventional PI controller.
To assess the impact on control effort and utility demand.

Main Methods:

Simulations were conducted using various fuzzy controller configurations and split range control setups.
Performance was evaluated using integral of error criteria, utility demand, and control effort metrics.
The fuzzy-PI controller was benchmarked against a standard PI controller under similar conditions.

Main Results:

The proposed fuzzy-PI controller demonstrated adequate temperature regulation across all tested configurations.
A specific energetically efficient split range configuration of the fuzzy-PI controller achieved comparable Integral of the Absolute Error (ITAE) to the conventional PI controller.
This configuration resulted in an 84.5% reduction in control effort and a 6.75% decrease in total utility demand.

Conclusions:

The fuzzy-PI controller coupled with a split range strategy is a viable and efficient method for fermentation temperature control.
The proposed system offers substantial improvements in energy efficiency and reduced operational load compared to conventional PI control.
This approach holds promise for optimizing industrial fermentation processes through advanced control techniques.