Experimental studies of adaptive control system for nuclear steam generators = 증기 발생기의 적응 제어시스템에 대한 실험적 연구

A new approach is proposed here for the level control of steam generators through a weighted one-step- ahead stochastic self-tuning algorithm. The complicated steam generator model is represented by four parameters; water level, feedwater, steam flow and stochastic disturbances. A set of time series difference equations are obtained by combining these parameters and the measurements of water level, feedwater flow, and steam flow. These parameters are determined by a recursive least squares algorithm which results from minimizing the sum of the squared error between output (steam generator water level) and one-step-ahead optimal prediction of output. This algorithm contains a forgetting factor which can be used to account for an exponential decay of past data in tracking a slow drift in the parameters. The recursive least squares with forgetting factor, $0.950 < \lambda < 0.995$, shows good performance when rapid changes occur in process. Control input is calculated by using the time series difference equation so that the one-step-ahead optimal prediction of output equals to desired output. However, excessive control effort may be called for to bring output to desired output. Therefore, the present weighted one-step-ahead controller is designed to achieve a compromise between the extent of bringing output to desired output and the amount of control effort. An additional integral action controller is adopted optionally to compensate for the steady-state offset which comes from non-zero mean disturbances or control input weighting. To measure water level, feedwater flow, and steam flow accurately, the conventional D/P cells are replaced by capacitance-type transducers. The transducers give excellent linearity, even in the very low $\triangle$P range. The experimental loop, which is a mock-up of the secondary loop of the nuclear power plant, is used to prove effectiveness of the present adaptive control algorithm. It can be concluded from experimental results that ...
Advisors
No, Hee-Cheonresearcher노희천researcher
Publisher
한국과학기술원
Issue Date
1986
Identifier
65467/325007 / 000841314
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 핵공학과, 1986.2, [ ix, 101 p. ]

Keywords

핵증기 발생기.

URI
http://hdl.handle.net/10203/49133
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=65467&flag=t
Appears in Collection
NE-Theses_Master(석사논문)
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