Adopting advanced automatic disturbance rejection control（ADRC） technology

a ADRC-P control scheme of water level in boiler drum has been put forward

i.e.the internal loop adopts p（proportional） control

to rapidly eliminate the feed-water disturbance

while the external loop adopts ADRC control.The results of simulation study show that the ADRC-P control strategy has better control quality and stronger robust than that of conventional PI-P control strategy

not only can effectively overcome disturbances from flow rate of steam and feed-water

but also can obtain good regulating quality in case of bigger variation for characteristic parameters of the object.