A valve flow characteristic curve fitting method and system
A characteristic curve, valve flow technology, applied in general control systems, control/regulation systems, instruments, etc., can solve problems such as valve flow function optimization, valve flow characteristic curve distortion, etc., to achieve high accuracy
Active Publication Date: 2022-06-28
STATE GRID HUNAN ELECTRIC POWER +2
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Problems solved by technology
However, the operating conditions of the valve flow characteristic test are different from those corresponding to the historical data of the unit. In addition, the influence of data noise will also cause the distortion of the valve flow characteristic curve obtained based on massive historical data. If necessary processing is not carried out, it may not be possible. For optimization of valve flow functions
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[0040] The following will take a 650MW supercritical thermal power unit as an implementation object, and carry out valve flow characteristic curve fitting according to the valve flow characteristic curve fitting method and system of the present invention, so as to further describe the valve flow characteristic curve fitting method and system of the present invention in detail. .
[0041] like figure 1 As shown, the valve flow characteristic curve fitting method in this embodiment includes:
[0042] 1) Obtain the historical unit operation data required for fitting the valve flow characteristic curve, and the unit operation historical data includes the main steam pressure data set {TP i }, Regulating stage pressure data set {IMP i }, total valve position command data set {FW i } and the pressure ratio dataset {ε i }, where i=1~N, N is the number of samples;
[0043] 2) For the total valve position command data set {FW i } and the pressure ratio dataset {ε i } Perform norm...
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The invention discloses a valve flow characteristic curve fitting method and system. The method of the invention includes obtaining unit operation history data required for valve flow characteristic curve fitting, and calculating the total valve position command data set {FW i} and pressure ratio data set {ε i} for normalization processing; set the data subset interval {S i} According to the data subset interval {S i} Determine the data subset set {C i} to complete the data subset classification; for the data subset collection {C i} in each data subset C i Perform cleaning to obtain the cleaned data subset C j * ; According to each cleaned data subset C j * Calculate the fitting points of the valve flow characteristic curve, and finally obtain the valve flow characteristic curve composed of all fitting points. The invention can clean and process massive historical data of the unit, and finally obtain a true and accurate valve flow characteristic curve, has the advantage of high accuracy, and can provide accurate basis for optimizing the valve flow function.
Description
technical field [0001] The invention belongs to the technical field of steam turbine valve flow function optimization control, and in particular relates to a valve flow characteristic curve fitting method and system. Background technique [0002] The valve flow characteristic curve of the steam turbine refers to the corresponding relationship between the total valve position command and the calculated steam flow (the calculated steam flow can be expressed by the ratio of the regulating stage pressure and the main steam pressure). The better the linearity of the valve flow characteristic curve, the better the primary frequency regulation, automatic power generation control and power stability control performance of the unit; when the linearity is worse, the above performance will deteriorate and even cause network-related security risks of the unit and the power grid. At this time, it is necessary to optimize the valve flow function to improve the linearity of the valve flow ...
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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 盛锴朱晓星陈厚涛寻新
Owner STATE GRID HUNAN ELECTRIC POWER