The parameters of coal-fired boilers generally have the characteristics of large delay and large inertia

which affect the control quality of main steam pressure. In this paper

ARMA time series prediction of main steam pressure signal is applied to the control of main steam pressure. The measured value of main steam pressure and its set value are taken as the PID inputs of boiler master control

and the fuel quantity of the unit is regulated by the boiler master control command in the coordinated mode of turbine and boiler. The control strategy introduces the measured value of the main steam pressure into the ARMA prediction model and determines the applicable model parameters through the current target load and variable load rate. The control strategy is applied to APROS simulation platform and the actual boiler master control of 600 MW coal-fired unit. The simulation results show that

the control strategy can alleviate the influence of large delay and inertia of control regulation to a certain extent

and the operation results show that the control quality of main steam pressure is improved.