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

Abstract

The invention relates to a process optimization control method and system for the main steam system of an ultra-supercritical unit. The method includes: obtaining a coordinated control scheme, and determining the adding position of the excitation signal according to the coordinated control scheme; According to the range of input variables, output variables and disturbance variables under different working conditions; according to the input position and the range of changes of input variables and output variables under each working condition, an excitation signal is applied to the set value of the input variable and the process input data and process output data are collected; According to the process input data and process output data under each working condition and using the closed-loop subspace identification algorithm to obtain the process variable model; according to the variation range and output variable of the disturbance variable under each working condition, use the least square method to obtain the disturbance model; according to the process The variable model and the disturbance model carry out process optimization control on the main steam system. The optimal 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...

AI Technical Summary

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

Images