Non-Linear System Limit Cycle Analysis for Feedwater Control System of BWR

摘要

The existence of the limit cycle oscillation in the feedwater control system is first theoretically predicted. Then the actual operation signals taken from Chin-Shan Nuclear Power Station (CSNPS) unit 1 are analyzed to confirm the prediction. An AD-5 analogue computer also is used to simulate the feedwater control system. The feasibility of retrieving the dynamic information in the limit cycle oscillation is surveyed by using the simulated signals. The retrieved information could be used to estimate the important parameters, such as proportional band and reset action rate of the PI controller, the mismatch gain, the gain between mismatch value and water level and the hysteresis characteristics of the control valve. Finally the benefit of analyzing the limit cycle oscillation signals is discussed. (ERA citation 10:002226)