Process optimization control method and process optimization control system for main steam system of ultra-supercritical unit

Abstract

The invention relates to a process optimization control method and a process optimization control system for a main steam system of an ultra-supercritical unit. The method comprises the steps as follows: acquiring a coordinated control scheme, and determining the adding position of an excitation signal according to the coordinated control scheme; carrying out working condition division of the operation process, and acquiring the change range of the input variable, the output variable and the disturbance variable under each working condition; applying an excitation signal to an input variable set value according to the adding position and the change range of the input variable and the output variable under each working condition, and collecting process input data and process output data; using the closed-loop subspace identification algorithm to acquire a process variable model according to the process input data and the process output data under each working condition; using the least square method to acquire a disturbance model according to the change range of the disturbance variable and the output variable under each working condition; and carrying out process optimization control of the main steam system according to the process variable model and the disturbance variable. The optimization control efficiency of the main steam system can be improved.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a process optimization control method and system for a main steam system of an ultra-supercritical unit. Background technique [0002] The main steam system is an important part of the thermal power unit. It is mainly used to maintain the stability of the main steam parameters during the complex working conditions of the thermal power unit and large-scale peak regulation. It is crucial to ensure the safe operation and power generation efficiency of the entire ultra-supercritical unit. [0003] The main steam system of the ultra-supercritical unit adopts a once-through furnace, without the buffer of the traditional drum furnace steam drum, which reduces the heat storage capacity of the ultra-supercritical unit, and the operating parameters of the ultra-supercritical unit have a greater impact on the heat storage capacity. Therefore, the temperature fluctuation of the main st...

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Problems solved by technology

[0003] The main steam system of the ultra-supercritical unit adopts a once-through furnace, without the buffer of the traditional drum furnace steam drum, which reduces the heat storage capacity of the ultra-supercritical unit, and the operating parameters of the ultra-supercritical unit have a greater impact on the heat storage capacity. Therefore, the temperature fluctuation of the main steam system of the ultra-supercritical unit is large

[0004] In order to reduce the temperature fluctuation of the main steam system and maintain the stability of the main steam parameters, the traditional method is usually to adjust the main steam system by coarse adjustment of water-to-coal ratio and fine adjustment of desuperheating water, so as to control the main steam parameters within the approximate range, but This adjustment method is arbitrary and cannot meet the control requirements of ultra-supercritical units, and the control efficiency is low

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