New Design Method of Coordinated Control System of Supercritical Pressure Power Unit and Its Application

Abstract

The boiler of supercritical coal fired generating unit is once-through boiler,and its dynamic response is complex.This paper presented a practical mathematical model of coordinated control object of supercritical pressure unit,adopting observer to estimate coal heat value,and design a synthetic coordinated control system(CCS) with state feedback based on increment function observer(IFO)-K?x,PID,intelligence control(IC) and British thermal unit(BTU)(heat value compensator).The details of the IC was described with mathematics method,and the full control system mathematics description was supplied with state space.The sufficient condition of system stabilization has been proved by mathematic analysis.The function of PID in this synthetic coordinated control system was shown.The project application shows that the load rate is 12 MW/min in constant and variable press mode.The system robustness is testified by practice and also provides an example improving response rate for supercritical press generating unit.