Design of a Fuzzy Logic Controller for Water Level Control in an Advanced Boiling Water Reactor Based on Input-Output Data

A fuzzy logic controller (FLC) has been designed to control the water level in an advanced boiling water reactor (ABWR). The performance was comparable to that of a proportional-integral controller. However, the feedwater flow rate did not change smoothly to the steady state. Therefore, a method based on input-output data was adopted to prevent this problem. The data required for deriving the fuzzy rules were the results of various instances of satisfactory manual control of an ABWR simulation model. To construct the membership functions of the linguistic variable, the data were clustered using the fuzzy C-means method. The fuzzy rules were then generated from the data. Because the control actions were not guaranteed to be proper in all the cases and the data were not complete for all the possible operation conditions, the fuzzy rules were modified and extra rules were added based on human knowledge so that satisfactory performance can be achieved. Nevertheless, the method is helpful in deriving a set of ...