Through analysis of problems existing in original coordinated control system of a supercritical unit equipped with direct injection coal pulverizing system using double-inlet and double-outlet ball mills

i.e.the AGC load changing rate of 6 MW/min is unable to be satisfied

the regulating behavior of once-through boiler boasting non-linearity

the temperature at midle points having deviation etc.

an optimization scheme

including adding front feed to load-changing commands

adding non-linear function and parameter varying device in the power-adjusting circuits of combustion

feed-water

and coodinated control

has been put forward and tests of increasing and decreasing load under AGC mode being carried out

it shows that the coordinated control system after optimization can satisfy the requirements of assessment indices for automatic generation control(AGC)

boasting good control quality.