Determination method for damping polarity supplied by power generator excitation system in oscillation process

Abstract

An embodiment of the invention discloses a determination method for damping polarity supplied by a power generator excitation system in an oscillation process, and aims to solve the technical problem that the damping polarity supplied by each control system of a power generator unit in a low-frequency oscillation process is not clear caused by the fact that damping conditions supplied by different control systems of the power generator unit in the low-frequency oscillation process of the power generator unit are not analyzed independently at present while only the overall external characteristics of the power generator unit are obtained. The determination method disclosed by the embodiment comprises the steps of reading disturbance data of the power generator unit; extracting a power generator transient-state electric reactance Q-axis potential changing amount: a formula which is as shown in the description, and a power generator rotary speed changing amount: a formula which is as shown in the description, according to the disturbance data of the power generator unit; and calculating dot product values of the formulas which are as shown in the description; and determining the damping polarity supplied by the excitation system according to the dot product values.

Description

technical field [0001] The invention relates to the field of generator excitation system oscillation, in particular to a method for judging damping polarity provided by generator excitation system oscillation. Background technique [0002] F. Demello and Concordia used the concept of damping torque in 1969 to study the mechanism of the low-frequency oscillation phenomenon in the single-infinite system. The results pointed out that under the conditions of high external system reactance and high generator power output, due to the excitation system There is inertia. With the increase of the magnification of the excitation system, the value of the real part of the characteristic root corresponding to the mechanical vibration of the rotor will gradually increase from a negative value. If the magnification is too large, the real part will change from negative to positive, resulting in an increase in oscillation. Therefore, the negative damping mechanism of low-frequency oscillatio...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a method for judging the polarity of the damping provided by the oscillation of the excitation system of the generator, which solves the problem that there is no separate analysis and calculation of the damping conditions provided by different control systems of the generator set in the process of analyzing the low-frequency oscillation of the generator set. The overall external characteristics of the generator set are obtained, but the technical problem of the polarity of the damping provided by each control system during the low-frequency oscillation process of the generator set is not clear

Images