NUCLEAR POWER PLANT FEEDWATER CONTROLLER DESIGN

摘要

-16-NUCLEAR POWER PLANTFEEDWATER CONTROLLER DESIGNABSTRACT OF THE DISCLOSUREA system for controlling the feedwater system in a nuclear power plantis disclosed. The system utilizesa logic calculations subsystem (50) whichselects the operational mode of the system to be monitored from a plurality ofoperational modes. A disturbance estimate calculations subsystem (52) containsa dynamic mathematic model of the feedwater system and compares measuredsystem variables with corresponding dynamic model variables contained thereinto produce signals representative of deviations therebetween. A modifiedfeedforward calculations subsystem (54) utilizes these signals and othersystem parameters as inputs to a steady-state mathematical model to producecontrol signals to determine valve positions and pump speeds so that thecontrol valve flows, minimum control valve pressure drop, and feedwater pumpflows are at their respective demanded values.