A MACS (Microcomputer-based Adaptive Control System of a Steam Generator) is developed to control the steam generator water level from 0\% to 100\% load. The important advantages of the MACS over conventional controllers are its dependence on one measurement, lower cost, and greater flexibility in the implementation of the MACS for a real plant.
The conventional P.I.D. controllers are replaced by APPLE micro-computer software with a simple digital circuit in the present design. The stochastic self-tuning regulator scheme in the control algorithm is adopted. This scheme can calculate an adaptive, optimal valve position in response to changes in the dynamics of the process and disturbances. The self-tuning regulator takes the form of adaptive control law which combines the recursive least squares estimator with the one-step ahead controller.
In computer simulation studies, a simplified discrete model is used to simulate the transient response of the water level of an actual steam generator. It is proved that the recursive least squares estimator provides the rapid parameter estimation and global convergence to minimize the square error between the measured output and a-posteriori predicted output. Also, it is shown that the self-tuning regulator developed here can control the steam generator water level at low load. Especially, it is found that the control input effort decreases with increasing weighting factor.
The experimental system is made to simulate the secondary loop in the nuclear power plant. From this system, the real water level data of the steam generator is directly obtained. A software is implemented in the micro-computer to receive the water level measurements and calculated control signal based on the stochastic self-tuning regulator algorithm. Through the experimental tests using the MACS, the same conclusions are reached as those obtained in the computer simulation studies.
원자력 발전소에 있는 증기발생기의 수위를 영출력부터 정격출력까지 안정되게 운전할 수 있도록 마이크로컴퓨터를 이용한 적용제어기를 개발하였다.
이 장치는 간단한 디지틀 회로와 적응제어 소프트 웨어로 구성되어 있다. 이 장치의 장점은 기존장치에 설치하기에 간편하며, 설치비용도 싸면서, 다양한 프로그램을 겸비할 수 있다.
본 논문에서 실지의 증기발생기 수위의 과도현상을 나타내는 간단한 이산 모델이 나타내었다.
self-tuning regulator 저부하에서도 정상상태의 오차 및 과도 응답없이 수위를 일정하게 제어할 수 있었다.
이때 순환적 최소자승추측기는 빠른 추측과 수렴을 보장해 주었다. 특히, 입력비중치를 조절함으로써 입력제어변수의 동요를 줄일 수 있었다.
원자력발전소의 이차계통을 모사하는 실험장치를 만들었다. 경험적인 전산 모사를 토대로 하여, 소형컴퓨터를 이용한 적응제어기는 증기발생기를 안정하게 제어할 수 있었다.
