Turbine generator low-excitation limit curve setting method based on static stability impedance circle

Abstract

The invention discloses a turbine generator low-excitation limit curve setting method based on a static stability impedance circle, and relates to a method for determining a low-excitation limit curveof an excitation regulator of a turbine generator. The problem that the leading phase control and depth control accuracy of an existing turbine generator is low, the setting is complex, and the excitation loss protection and the low excitation limit curve can be easily mismatched to cause excitation loss maloperation shutdown is solved. The method comprises the following steps: a static stabilityimpedance circle equation of a turbine generator under an impedance coordinate system is obtained by utilizing static stability limit parameters of the turbine generator, wherein the abscissa of theimpedance coordinate system is resistance R, and the ordinate is reactance X; a low-excitation limit impedance circle equation of the turbine generator is set by utilizing the static stability impedance circle equation of the turbine generator; and a low-excitation limit curve of the turbine generator is drawn by utilizing the low-excitation limit impedance circle equation of the turbine generator. The method is suitable for controlling the leading phase of the turbine generator.

Description

technical field [0001] The invention relates to a method for determining a low excitation limit curve of a turbo generator excitation regulator. 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 depth of advanced phase is often difficult to control, and the setting is complicated. The problem of wrong matching of low excitation limit curve leads to malfunction and shutdown due to loss of excitation. Contents of the invention [0003] The present invention aims to solve the problem that the existing turbogenerators have poor control accuracy of advanced phase control depth, complicated setting, prone to mis-matching loss-of-excitation protection and low-excitation limit curves, resulting in loss-of-excitation malfunction shutdown, and proposes a method based on A tuning method for the lo...

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Problems solved by technology

[0003] The present invention aims to solve the problem that the existing turbogenerators have poor control accuracy of advanced phase control depth, complicated setting, prone to mis-matching loss-of-excitation protection and low-excitation limit curves, resulting in loss-of-excitation malfunction shutdown, and proposes a method based on Setting Method of Low Excitation Limiting Curve of Turbogenerator Based on Static Stable Impedance Circle

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