600MW supercritical thermal power generating unit modeling and control method

Abstract

The invention relates to a 600MW supercritical thermal power generating unit modeling and control method. The method comprises the following steps: step 100, obtaining discrete models of a unit by utilizing a subspace identification method; step 200, combining the discrete models to obtain an overall model of the unit; and step 300, designing a model prediction controller according to the overallmodel, including setting names and initial values of input and output variables in the overall model, setting upper and lower boundaries of the input and output variables, upper and lower boundaries of a change rate, and setting a steady-state target. The beneficial effects of the invention are that: firstly, a subspace model identification method is adopted to establish a unit system model; for amodel obtained through subspace identification, a model prediction controller is designed, constraint upper and lower bounds of system key variables and a steady-state target are set, a model prediction control algorithm and a simulation result show that the controller is good in control effect, and the effectiveness of the selected method and strategy is fully proved.

Description

technical field [0001] This application relates to a modeling and control method for a thermal power unit, in particular to a modeling and control method for a 600MW supercritical thermal power unit. Background technique [0002] In my country, due to the composition of the energy structure, most of the energy is produced by the combustion of coal. According to data released by the National Bureau of Statistics, in 2015, the absolute power generation capacity of the whole country was 5.6184 trillion kwh, of which the absolute power generation capacity of thermal power was 4.2102 trillion kwh, accounting for more than 70% of the total power generation. China's power system is the largest in the world, and the main source of energy is coal, which accounts for more than half of the country's coal production. The dominant position of coal resources in my country's primary energy structure has established the pattern of coal-fired thermal power units in my country's power produc...

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Problems solved by technology

According to the characteristics of thermal power units, the state variable technology and phase compensation technology are applied to the steam pressure control strategy. Although there are many literatures on the dynamic characteristics of supercritical units, these models usually consist of a set of complex nonlinear differential equations. For power station simulators, it cannot be directly used for control system design

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