At present

water islands with centralized arrangement is widely used in thermal power plants

which can realize unified coordination and intelligent control of each water system

and reduce the maintenance workload of operating personnel.On the basis of fieldbus control system(FCS) and FDMS software

this paper develops an intelligent water island control system

which comprises of system initialization module

water network control system module

data analysis system module and operation and maintenance manual module.Moreover

this control system is used to process the data collected from the monitoring system for each subsystems' feedwater and discharge

to calculate the water consumption with high precision

thus the water consumption in each subsystem of the power plant can be optimized based on the FCS big data analysis and gradient water use principle.By health analysis for controlled equipments in each subsystem

the problem of judging the public equipment starting process occurs in the water supply pipe system in water island is solved

the device fault warning and analysis can be carried out

and full automatic control for the water island system can be realized.The application of this intelligent water island control system in an ultra supercritical unit shows good control effect

which helps the unit save water and energy and realize fault prediction.