In order to overcome the influence of power plants improving the dynamic overshoot of fuel rate on main steam temperature control

a new type feed-forward controller was designed

on the basis of dynamic model of main steam temperature control.The dynamic tuning principles and algorithm for this controller was proposed

and the algorithm was verified by model simulation.The main steam temperature feed-forward cascade control system was formed by using this feed-forward controller in main steam temperature cascade control system

to optimize the main steam temperature control system for a 600 MW unit.For the improved control system

the main steam temperature fluctuated within the range of-3 ℃ to 3 ℃(set value) when the unit running steadily;while when the load variation rate was 2.5% MCR

the main steam temperature fluctuated from-5 ℃ to 5 ℃(set value).Thus

the disturbance of coal quantity and air volume on main steam temperature was overcome

and the influence of improving dynamic overshoot of fuel rate on main steam temperature was eliminated.