A method based on ant colony algorithm to obtain the flow rate of high pressure valve group of steam turbine

Abstract

The invention discloses a method for acquiring the flow rates of steam turbine high-pressure governing valve groups based on an ant colony algorithm. According to the method, the impacts of the pressure after a main steam valve, the opening degrees of the governing valve groups, the pressure after a governing stage and the running state of a steam turbine set after the governing stage on the flow rates of the high-pressure governing valve groups are considered, as well as the pressure after the governing stage and the pressure after each governing valve group are initialized by utilizing experimental data and the opening degree of each high-pressure governing valve group; the relation between the pressure after the governing stage and the flow rates of the governing valve groups is confirmed; and the initial value of the pressure after the governing stage for entry in the next iteration is determined according to the ant colony algorithm, the pressure after the governing stage is calculated iteratively, and the flow rates of the steam turbine high-pressure governing valve groups are calculated finally. The method provided by the invention has the advantages of being high in solving accuracy and solving speed, stable, and the like; by adoption of the method, the problem that a conventional modeling method for calculating the flow rates of the high-pressure governing valve groups is high in implementary difficulty and low in calculation speed can be solved; and the method has important meanings for the online monitoring of a power plant about whether the steam turbine high-pressure governing valve groups normally run or not as well as the assistant development of a corresponding variable working-condition control system.

Description

technical field [0001] The invention relates to the field of steam turbine high-voltage control gates in thermoelectric energy, in particular to a method for obtaining the flow rate of steam turbine high-voltage control gate groups based on an ant colony algorithm. Background technique [0002] A steam turbine is a prime mover that converts the thermal energy of steam into mechanical work, and is an important part of electric power production. The power generated by the steam turbine during operation needs to change according to the load command of the power grid. Nozzle gas distribution is an important means to adjust the power generated by the steam turbine. The regulating valve of the steam turbine is responsible for regulating the flow rate of the regulating stage of the steam turbine in the nozzle gas distribution, and then achieves the effect of controlling the power of the steam turbine. Regulates the relationship between post-stage pressures. The study of this char...

AI Technical Summary

Problems solved by technology

[0008] The mechanism model is established based on the characteristics of the high-pressure control valve and the control stage of the steam turbine. The model established by the existing technology has the disadvantages of slow calculation speed and poor convergence.

In the actual modeling process, the calculation speed of the established model is slow, and the calculation time is long, which cannot meet the requirements of high solution speed and excellent model stability in practice.

Images