Directing against the problems existing in control system of supercritical 2×660 MW units in the first-phase project of Datang Ma'anshan Dangtu Power Generation Co Ltd

such as large fluetuation of the main steam pressure

bad suitability to the frequent change of coal quality

and show response to the load etc.

the load command and the pressure set value in the coordinated control system of units

the master control of boiler

the master control of steam turbine

and the control eircuits of primary frequency modulation

feed-water

and fuel etc have been optimizaed.Results of test show that the load deviation in stable state of units after optimization of the control system has reduced

the fluctuation of main steam pressure is smaller in the process of load change

the deviation between main steam pressure and the set value is smaller under stable load

the control quality has been remarkably enhanced.