Analysis method for steam turbine valve flow characteristics on the basis of historical data regression analysis

Abstract

The invention discloses an analysis method for steam turbine valve flow characteristics on the basis of historical data regression analysis. The historical operation data of a unit is taken as the input value of multiple regression analysis to calculate each parameter value in a multiple regression expression; in the obtained multiple regression expression, parameter values, including main steam pressure, the post pressure of each regulation valve and the like, under a corresponding single valve experiment working condition are input; the pressure change situation of a regulating stage chamberin a process that a target regulation valve is completely closed from completed opened is calculated; and a valve flow characteristic calculation method can be applied to obtain the flow characteristic curve of the target regulation valve. Compared with the prior art, the invention adopts the analysis method for steam turbine valve flow characteristics on the basis of the historical data regression analysis to research the practical valve flow characteristics of the steam turbine, a historical data driven calculation method for steam turbine valve flow characteristics is realized, and manpower and material resources can be saved.

Description

technical field [0001] The invention relates to a steam turbine valve flow characteristic analysis method based on historical data regression analysis, which can use historical operating data instead of a single valve flow characteristic test to calculate the flow characteristic of a high-pressure regulating valve, and belongs to the field of steam turbine control and belongs to the field of steam turbine control. Background technique [0002] The steam turbine valve flow characteristic curve is the corresponding relationship between the opening of the steam inlet valve of the steam turbine and the steam flow through the valve. Due to differences in the manufacture and installation of each valve, wear and tear during long-term operation, changes in equipment and configuration during inspection and modification, or the inconsistency between the design stroke and the actual stroke, etc., the characteristic curve of the valve flow may be different from the original flow. If the...

AI Technical Summary

Problems solved by technology

Due to the differences in the production and installation of each valve, the wear and tear of long-term operation, the changes in equipment and configuration during the inspection and modification process, or the inconsistency between the design stroke and the actual stroke, etc., the characteristic curve of the valve flow may be different from the original flow.

If the flow characteristic curve of the steam turbine valve does not match the actual flow characteristic of the valve, and the overlap setting is unreasonable, there may be problems of sudden load change and slow adjustment when the unit changes load and primary frequency regulation. Large fluctuations in unit load caused by different steam flow rates under the same load command before and after

[0003] To measure the flow characteristic curve of the steam turbine valve, it is necessary to carry out the test of the flow characteristic of the steam turbine valve, but the traditional test method is complicated, takes a long time, and is easy to affect the operation of the unit, while the commonly used optimization calculation method has low efficiency and poor accuracy

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