Method for eliminating influence of backpressure change of air-cooled unit on automatic gain control (AGC) regulation quality

Abstract

The invention discloses a method for eliminating influence of backpressure change of an air-cooled unit on automatic gain control (AGC) regulation quality. The method comprises the following specific steps of: 1, performing differential of pressure difference; 2, performing high-low limit comparison on signals from the step 1, wherein the signals are used as boiler master control feedforward I; 3, setting boiler master control feedforward II; 4, setting boiler master control feedforward III; 5, summating output signals of the boiler master control feedforward I, II and III from the steps 2, 3 and 4, and feeding into boiler master control pure integration differentiation (PID)1; 6, setting the boil master control PID1; 7, checking coal quality by coal quality checking loop PID3, and feeding output signals into fuel mater control PID2 in a step 8; and 8, setting the fuel master control PID2, wherein the set value is the output of the boiler master control PID1, and the regulated variable is product of fuel quantity and the value of the output signals of the PID3; and then sending coal supply commands.

Description

technical field [0001] The invention relates to a method for optimizing AGC adjustment quality, in particular to a method for solving the influence of the back pressure change of an air-cooling unit on the AGC adjustment quality. Background technique [0002] With the vigorous development of the power industry and the consideration of saving water resources, the proportion of 600MW and 1000MW air-cooled thermal power generating units in the power grid is increasing, and the control of the back pressure of the air-cooling unit has not been well resolved; When the pressure changes, there is also a lack of corresponding countermeasures for the impact on combustion, air supply and other subsystems and coordinated control, resulting in large fluctuations in pressure, load, steam temperature and oxygen content; at the same time, changes in the back pressure of the air-cooling unit make If the main steam pressure and back pressure of the unit deviate from the design value, the effi...

AI Technical Summary

Problems solved by technology

[0005] 2. Back pressure control is not good for air supply control

[0006] 3. Changes in back pressure affect the quality of coordination regulation

[0007] 4. When the back pressure of the air-cooling unit changes, there is a lack of corresponding countermeasures for the impact on combustion, air supply and other subsystems and coordinated control, resulting in large fluctuations in pressure, load, steam temperature and oxygen content; at the same time, the back pressure of the air-cooling unit The change of pressure will make the main steam pressure and back pressure of the unit deviate from the design value, which will reduce the efficiency of the unit and even affect the safe operation of the unit

[0008] 5. Instantaneous drastic changes in back pressure will cause drastic fluctuations in unit parameters, and even cause tripping

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