An AGC control method for 660mw supercritical unit under deep peak regulation

A supercritical unit and peak shaving technology, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problems of unit shutdown, insignificant adjustment effect, and excessive amplitude, so as to improve the safety and reliability of operation. The effect of reducing pollutant over-emission and preventing the rate from being too large
CN108594663BActive Publication Date: 2021-03-23MAANSHAN DANGTU POWER GENERATION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
MAANSHAN DANGTU POWER GENERATION
Publication Date
2021-03-23

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Abstract

The invention belongs to the technical field of AGC (automatic gain control) control and discloses an AGC control method for a 660MW supercritical unit under deep peak-load regulation. The method includes: when a unit load enters a deep peak-load regulation range, subjecting flow of steam pumps to minimum flow limitation; when the flow of each single steam pump is smaller than 435T / H, enabling a steam pump recirculation valve to participate in steam pump inlet flow regulation, slowly opening, and keeping each steam pump operating above minimum output; increasing smoke temperature on a boiler side, and slowly closing a denitrification wide load baffle along with the unit load to keep smoke temperature under a low unit load condition; after the unit load enters the deep peak-load regulationrange, automatically reducing the rate through AGC rate judgment, and enabling boiler master control and steam engine master control PID self-adaption variable-parameter control through AGC control, so that automatic control quality can be improved. Automatic control of the steam feed pump recirculation valve and the denitrification wide load baffle along with the unit load, AGC automatic controlunder deep peak-load regulation, steam engine master control PID self-adaption control and boiler master control PID self-adaption control are realized.
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Description

technical field

[0001] The invention relates to the technical field of AGC control, and more specifically relates to an AGC control method for a 660MW supercritical unit under deep peak regulation. Background technique

[0002] The working medium in the boiler is water, and the critical pressure of water is: 22.115MPA, 374.15°C; at this pressure and temperature, the latent heat of vaporization of water and steam is equal to zero, and there is no two-phase region, that is, water is continuous into steam , and in a single-phase form, it is called the critical point of water, and the pressure of the working fluid in the furnace is greater than this pressure, which is a supercritical boiler. Automatic Gain Control (AGC) is an important part of the Energy Management System (EMS). According to the control target of the power grid dispatching center, the command is sent to the relevant power plant or unit, and the automatic control of the power of the generator is realized through...

Claims

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