Air-cooled generating set steam turbine operation back pressure continuous optimal control method and system

Abstract

The invention relates to an operation back pressure continuous optimized control method and system for a wet cooling steam turbine. The method includes the steps that a primary model is built; a hydraulic model of a cold source system is built; a pressing head model and a power model are built; a condenser model is built; a time-varying factor model is built; a secondary model is built; a back pressure model is built; a steam turbine heat rate model used for determining the relation between the steam turbine cycling heat rate and generator unit back pressure is built; control is optimized, under the condition of current power generation power, according to the power model, a back pressure module and the heat rate model, cold source power consumption and fuel consumption of different cold source operation modes are calculated, and an optimal solution of cold source optimized control is obtained. The method and system completely break through substantive technical barriers of the background technology, key technologies of vacuum continuous optimized control of a large power plant steam turbine set are completely achieved for the first time, the historical subject is solved, and an ideal application effect is achieved in practice.

Description

technical field [0001] The invention relates to a continuous optimization control method and system for the running back pressure of an air-cooled generating set steam turbine, which belongs to the field of optimal control of the condensing steam turbine cycle in large-scale thermal power generation processes such as coal, gas and nuclear energy, especially the back pressure of direct air-cooled condensers. Optimally controlled areas of pressure or vacuum. Background technique [0002] The cooling system of the steam turbine cycle condenser of a large direct air-cooled generating set is an air-cooled island, or a cold source system. The cooling medium is delivered by multiple single-stage axial flow fans driven by multiple motors and equipped with frequency converters for speed regulation. , that is, air. Air cooling fans consume a lot of electricity. During the operation of the generator set, the air cooling island can continuously adjust the flow of cooling medium by adj...

AI Technical Summary

Problems solved by technology

[0015] Because the cold source optimization problem involves the theoretical and practical problems of various models such as the steam turbine cycle model, the cold source model, and the condenser model, especially due to the complexity caused by the above-mentioned various time-varying factors, the vacuum optimal control problem becomes very difficult

Background technology No useful systematic results have been obtained

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