The conventional coordinated control system for coal-fired units usually applies the DIB(direct instruction balance) method

of which the parameter tuning relies on experiences and has strong subjectivity. To solve this problem

this article proposes a predictive feed coal quantity feedforward method for the coordinated control system

on the basis of the mathematic model identified from the field test. In this method

the predictive feed coal quantity can be given quickly and accurately within the allowable range of the pulverizing system. The feedforward design for relative sub circuits is then carried out

like the sliding pressure curves

the varying load rate and air volume. Moreover

this method was used in design of the coordinated control system for a 300 MW unit

which provides a new method for optimization operation of the units with automatic generation control.