In order to reduce the AGC assessment and improve the automatic control level of deep peak load regulation units

during the test run process of ultra supercritical units

a series of optimization adjustment methods are adopted

such as optimization of set-point function

auxiliary pressure regulation of steam turbine

composite control of water and coal

feed-forward of dynamic variable load

correction of heat value of grinding

perfection of locking and limiting conditions

optimization of valve characteristics and steam pump recycling control

which realizes the continuous and stable input of coordinated control in the range of minimum stable combustion load ～ 50% rated load

and the control index is good. At the same time

the control characteristics

difficulties and precautions in the deep regulation stage are analyzed

and the control points in low load section of the ultra supercritical unit are pointed out

which has reference value for deep peak regulation transformation of the ultra supercritical units and the improvement of safe and stable operation performance.