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연속교반 생물반응기에서의 균체농도 디지탈 제어-Part 1. 추계 적응제어방식(ELS-STR)에 의한 균체농도제어
Digital Control of Cell Mass Concentration in Continuous stirred Tank Bioreactor-Part1. Cell Mass Control Using Stochastic Adaptive Control Algorithm(ELs-STR)
HWAHAK KONGHAK, December 1989, 27(6), 794-803(10), NONE
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Abstract
연속교반 생물반응기에서의 효모 균체농도제어를 위하여 두 종류의 디지탈 제어 알고리듬이 실험적으로 검중되었다. 하나의 출력을 높이 가중시킨 이차비용제어기로부터 유도되는 큰 이득의 비례제어기이고, 다른 하나는 출력을 높이 가중시킨 이차비용제어기로부터 유도되는 큰 이득의 비례제어기이고, 다른 하나는 확장된 최소제곱법을 매개변수추정법으로 사용한 최소분산제어방식의 추계 적응제어기(=ELS-STR)이다. 상태변수인 균체농도의 직결측정은 배양액의 광밀도를 측정함으로써 이루어졌다. 실험결과로부터 균체농도제어 경우에는 ELS-STR의 성능이 PID 제어기보다 우수함을 알았다.
Two types of digital control algorithm were experimentally examined for the control of yeast cell-mass concentration in a CSTBR(continuous stirred tank bioreactor). One of them is a high gain proportional control resulted from highly output weighted quadratic cost regulator. The other is a stochastic adaptive control named ELS-STR, which is a minimum variance controller with an extended least-squares method as parameter identifier. On-line esti-mation of the state variable, cell mass concentration, was carried out by measuring optical censity of the fermentor broth. From experimental results, it was known that the performances of ELS-STR were better than that of conven-tional PID controller in cell mass control case.