Method of acquiring low-excitation limit curve of steam turbine generator

Abstract

The invention discloses a method of acquiring a low-excitation limit curve of a steam turbine generator, which belongs to the field of setting of low-excitation limit curves of excitation regulators of steam turbine generators and solves the problems that the existing low-excitation limit curve is complex in acquiring process and low in precision. The method comprises the following steps of: firstly, acquiring a circle center coordinate (0, a) and a radius r of a static stable impedance circle of the steam turbine generator in an impedance coordinate system according to data information of thesteam turbine generator in a static stable state, drawing a steam turbine generator static stability margin impedance circle under the impedance coordinate system according to the circle center coordinate (0, a), the radius r and the Kk, and finally, according to the steam turbine generator static stability margin impedance circle, drawing an externally tangent regular hexagon of the steam turbine generator static stability margin impedance circle so as to obtain an externally tangent regular hexagon curve equation which is a steam turbine generator low-excitation limit curve equation, thereby completing the acquisition of the steam turbine generator low-excitation limit curve equation. The method is mainly applied to the field of steam turbine generators.

Description

technical field [0001] The invention belongs to the field of low-excitation limit curve setting of a turbo-generator excitation regulator, and in particular relates to a method for obtaining a low-excitation limit curve of a turbo-generator based on a statically stable impedance circle circumscribed with a regular hexagon. Background technique [0002] When the turbogenerator is running in advanced phase, the low-excitation limit curve in the impedance coordinate system changes with the change of random terminal voltage, active power and reactive power. The matching error between the loss-of-excitation protection and the low-excitation limit curve leads to the loss-of-excitation malfunction shutdown. Therefore, it is necessary to propose a simple acquisition process and high-precision low-excitation limit curve setting method for the turbogenerator. Contents of the invention [0003] The purpose of the invention is to solve the problems of complex acquisition process and l...

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Problems solved by technology

[0003] The present invention is to solve the problem of complex acquisition process and low precision of the existing low-excitation limit curve, and the present invention provides a method for obtaining the low-excitation limit curve of a turbogenerator

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