The main temperature is a control object with behaviors of large inertia and delay

time variability

uncertainty

and non-linerarity etc.

hence it is difficult to obtain good control effectiveness using general cascade control strategy.The main steam temperature control strategy put forward from Siemens Corporation has been analysed

in which the set value of output temperature for valves used to spary desuperheating water is determined by calculating the steam enthalpy of superheater

the main steam temperature can vary with the load to adapt the variation of dynamic behavior under different operating conditions

and to reach a good control effectiveness.Test shows that the control strategy from Siemens Corporation has good robustness and anti-jamming ability

and the dynamic behavior of main steam temperature regulaton being improved.