Control of main steam temperature(MST) is becoming more and more challenging because of unknown disturbances caused by frequent and extensive load changes and strict control requirements for the efficiency and safety. To this end

considering the sluggish responses to the disturbances caused by high order dynamics

an antidisturbance control scheme with stair-like dynamic matrix control(SDMC) algorithm as the core is proposed to solve fundamentally the control problem of large delay

big inertia and multiple disturbances in MST. This study aims to provide technical support for the clean and efficient use of coal and the large-scale consumption of renewable energy sources in China. A simulation example shows that the proposed improved equivalent input disturbance observer(IEIDO) can realize real-time estimation and compensation of disturbances

while SDMC can not only ensure the rapidity and stability of the steam temperature control system

but also achieve disturbance suppression according to the introduction of measured disturbance feed-forward compensation technology. Therefore

the proposed scheme can guarantee the safety

stability

economy and flexibility of the unit operation

which has a promising application future in power industry.