Directing against the problems existing in control system of 2×350 MW units in the first-phase project of Huaneng Rizhao Power Plant

such as the slow response speed to load

and unable to satisfy the requirements of AGC function of power grid

etc.

the control logics related to the coordinated control of units

the superheated steam temperature

the primary air pressure

the primary air flow rate of coal pulverizer etc.have been optimized

and the parameters of regulator in related control systems being set

adopting widely the variable structure and variable parameter controls

enhancing control quality of control system for units.After putting the coordinated control mode into operation for units no.1 and no.2

test of variating load range

and load-increasing rate

as well as assessment test of AGC have been carried out respectively.Results show that the control indices of coordinated control system after optimization all can satisfy the AGC functions required by the power grid

the load variation range is 175~350 MW

the load variating rate reaches 4~5 MW/min

the main parameters of units can satisfy the requirements of operation.