Valve flow function optimization method based on unit operation data

Abstract

The invention discloses a valve flow function optimization method based on unit operation data. According to the method, operation data of a thermal power generating unit is processed to obtain actual valve flow performance data of the thermal power generating unit; finally, an ideal valve flow function is established on basis of the actual valve flow performance data; configuration of a digital electro-hydraulic system of the thermal power generating unit is set with the ideal valve flow function so that an actual valve flow function is consistent to the ideal valve flow function, and the valve flow function is optimized. Compared with the prior art, the method has the advantages that the valve flow function can be optimized without performing a valve flow performance test, optimization time is shortened, and optimization efficiency is improved; the influence of main steam pressure is fully considered in the calculation of theoretical steam flow, a calculation error caused by fluctuation of the main steam pressure is avoided, and optimization precision is improved.

Description

technical field [0001] The invention belongs to the technical field of thermal power generating sets, and in particular relates to a valve flow function optimization method based on unit operating data. Background technique [0002] The valve flow characteristic of the steam turbine refers to the corresponding relationship between the steam valve opening adjusted by the steam turbine and the steam flow entering the steam turbine. This correspondence generally has nonlinear characteristics, which is not conducive to the control of the unit. The valve flow function of the steam turbine sets the flow command and adjusts the steam valve mapping relationship, in order to establish a linear relationship between the flow command and the steam flow, and finally optimize the control characteristics of the system. Since the valve flow function is generally preset by the manufacturer, and the flow characteristics of the unit may change during installation, operation, and maintenance, ...

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Problems solved by technology

However, the optimization method based on the valve flow characteristic test has the following deficiencies: 1. The test time is long, sufficient test data needs to be tested under enough working conditions; 2. The test accuracy is affected by the fluctuation of the main parameters of the unit, and the test requirements The main steam pressure is stable, and the absolute stability of the main steam pressure is impossible, and the fluctuation of the main steam pressure will eventually affect the accuracy of the test; 3. It is difficult to directly confirm the test effect. At present, the confirmation of the test effect is based on whether the system control performance is improved. It is still impossible to judge the optimization effect intuitively

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