CONTROL OF BIO–REACTOR PROCESSES USING A NEW CDM PI–P CONTROL STRATEGY

For economical point of view, it is necessary to operate a bio-reactor system at unstable steady state condition. The design of controller for such system is challengeable one. If any delay includes in the bio-reactor system then, the control methodology is found to be more difficult. In the present work, a new, Coefficient Diagram Method (CDM) based PI–P control strategy is proposed to operate the bio-rector effectively at unstable steady state condition. The proposed control strategy, designated as CDM PI-P, is tested with the bio–reactor system which is approximated as Unstable First Order Plus Time Delay (UFOPTD) transfer function. Simulation results clearly indicate that the proposed control strategy gives an enhanced control performance in operating the bio-rector at unstable condition. The performance of the control strategy is analyzed in terms of Integral Square Error (ISE), Integral Absolute Error (IAE) and Total Variation (TV). A comparison of the proposed strategy with other control strategy is made