Against such characteristics as pure time delay

time-varying and uncertainty of the controlled object in main steam temperature control

a new control strategy based on anti-delay control structure was proposed

on the basis of error analysis.The inexact model based close-loop output and the actual close-loop output were weighted as a new structure's impulse.The new structure and the Smith predictor were combined to form a composite structure.The robust performance of the composite structure was analyzed.In addition

control effect of the composite control structure and the Smith predictive compensate control structure was compared.The results show that

the composite control structure solved the problem of timevarying within a small range

and its control effect to step response was obviously superior to that of the Smith predictive compensate control structure

which improved the anti-delay performance of the system.