Abstract
In operation process of ultra supercritical unit, the stability of the superheated steam temperature depends on the adjusting fuel water ratio correctly. In order to improve the speed and accuracy of fuel water ratio, in this paper the active disturbance rejection control technology was used in superheated steam temperature control system in ultra supercritical units, proposing that in the secondary superheated steam temperature control system, the main regulator used ADRC, and the secondary regulator used traditional PID to control, that's the design of ADRC-PID superheated steam temperature control system. The main regulator can control the superheated steam temperature within permitted changes, the secondary regulator can eliminate various disturbances rapidly and finely, adjust the outlet temperature of spray de-superheater, and control the superheated steam temperature in the allowable range. Finally, the experimental results show that, superheated steam temperature control system with ADRC has better load adaptability, stronger robustness and anti-interference ability, faster tracking velocity than with PID, thus the control quality of ADRC is significantly superior to the traditional PID.
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