Steam turbine flow characteristic optimization method based on full-stroke modeling

Abstract

The invention provides a steam turbine flow characteristic optimization method based on full-stroke modeling. The method is based on an improved turbine high control valve flow characteristic test. Anactual flow calculation method is provided, a filtering technology and a clustering algorithm are applied, a full-stroke mathematical model of a turbine flow instruction, a control valve opening degree and actual flow is established by means of a piecewise linear function, and an accurate theoretical basis is provided for turbine high control valve flow characteristic function optimization, overlapping degree adjustment, valve sequence modification and the like. The method has the advantages that the full-stroke flow characteristic model within the total instruction range of (0-100)% flow canbe accurately established, and on the basis, optimization within the total instruction range is achieved. Through repeated test verification and operation effect display after optimization of multiple units, the turbine flow characteristic function optimization method based on flow total instruction full-stroke modeling has a good effect in practical application.

Description

Technical field: [0001] The invention is directly applied to the field of parameter optimization of a steam turbine DEH (digital electro-hydraulic control) system in a thermal power plant, and relates to a steam turbine flow characteristic optimization method based on full stroke modeling. Based on the improved test of the flow characteristics of the high-profile steam turbine valve, a calculation method for the actual flow rate is proposed, using filtering technology and clustering algorithm, and using piecewise linear functions to establish a full-stroke mathematical model of the steam turbine flow command, valve opening and actual flow rate , to provide an accurate theoretical basis for the optimization of the flow characteristic function of the steam turbine high-profile valve, the adjustment of the overlap degree, and the modification of the valve sequence. Background technique: [0002] The steam turbine flow characteristic is to describe the corresponding relationship...

AI Technical Summary

Problems solved by technology

[0004] Existing methods, whether through test methods, on-site trial methods, or using historical data mining, are all subject to the load range of the actual operation of the unit, and can only achieve flow characteristic optimization within the range of about 60%-100% flow command. It is impossible to realize the optimization of flow characteristics in the range of about 60%-100% flow command

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