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On-line application of an auto-tuning PI D controller for dissolved oxygen concentration in a fermentation process

Control Systems Research Group, School of Electrical Engineering, Electronics and Physics, Liverpool John Moores University, Byrom Street, Liverpool, L3 3AF, UK

D. Williams, CEng PhD. BEng

Control Systems Research Group, School of Electrical Engineering, Electronics and Physics, Liverpool John Moores University, Byrom Street, Liverpool, L3 3AF, UK

P.A. Montgomery, CEng, PhD, MSc

Control Systems Research Group, School of Electrical Engineering, Electronics and Physics, Liverpool John Moores University, Byrom Street, Liverpool, L3 3AF, UK

Biotechnological processes are notoriously difficult to control because of their non-linear time-variant characteristics. The application of an autotuning PID controller is presented as a viable aid as either a means to determine suitable tuning PID parameter values or as a retuning controller, initiated either automatically or by an operator. The controller operation is introduced and on-line results presented to compare the performance of the autotuner with a well-tuned PID controller on both batch and fed-batch fermentations. The benefits for the operator and process operation are demonstrated with on-line results on batch anti fed-batch fermentation processes.

Key Words: Auto-tuning • Bakers' Yeast • dissolved oxygen • on-lines • PID control

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