Method and system for controlling rising rate of steam turbine

The invention discloses a method and a system for controlling the rate-up of a steam turbine. The method comprises the following steps: calculating a first allowable rate-up based on the surface metal temperature and the surface allowable stress of a rotor before gas feeding after grid connection; collecting the surface stress of the rotor, the change rate of the surface stress and the change rate of the main steam temperature according to a periodic time point, and calculating a second allowable rate of rising at the time point; based on a minimum value of the first and second allowable ramping rates as a first reference ramping rate; the differential expansion and the differential expansion change rate of the high-pressure cylinder are collected according to the time points, and a third allowable rising rate is calculated; the differential expansion and the differential expansion change rate of the medium-pressure cylinder are collected according to time points, and a fourth allowable rising rate is calcula