Data modeling method and data modeling system for coordinated control system of ultra-supercritical unit

Abstract

The invention relates to a data modeling method and a data modeling system for a coordinated control system of an ultra-supercritical unit. The method comprises the steps as follows: acquiring a control scheme of the coordinated control system, and determining the adding position of an excitation signal according to the control scheme; carrying out working condition division of the operation process, and acquiring the change range of the input variable, output variable and disturbance variable of an ultra-supercritical unit 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 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; using the least square method to acquire a disturbance model according to the change range of the disturbance variable and the output variable; and taking the process variable model and the disturbance model as control models. The coordinated control process is both quick and stable.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a data modeling method and system for an ultra-supercritical unit coordinated control system. Background technique [0002] Compared with traditional thermal power units, the power generation method of DC ultra-supercritical units has the characteristics of higher efficiency, lower energy consumption, and more environmental protection, which is more in line with the requirements of modern enterprises. At the same time, the complexity and control quality of ultra-supercritical units High standards put forward higher requirements for control methods, which are difficult to achieve with traditional control methods, and usually need to be achieved through process optimization technology and advanced control technology. At present, process optimization technology and advanced control are based on accurate and effective mathematical models of process objects. Therefore, it is ver...

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Problems solved by technology

[0004] The traditional process model identification for the coordinated control system based on boiler following, or the process model identification for the coordinated control system based on turbine following, generally has the problem of one-way coordination, and cannot satisfy the unit load coordination at the same time. Quickness and smoothness of control

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