1. A method of controlling a steam generating boiler system, comprising: obtaining a signal indicative of a disturbance variable used in the steam generating boiler system; determining a rate of change of the disturbance variable; providing a signal indicative of the rate of change of the disturbance variable to an input of a dynamic matrix controller; generating, by the dynamic matrix controller, a control signal based on the signal indicative of the rate of change of the disturbance variable; and controlling, based on the control signal, a temperature of output steam, wherein the output steam is generated by the steam generating boiler system for delivery to a turbine.