Positioning and analyzing method of oscillation center based on reactive power integral in multi-machine system

Abstract

The invention relates to a positioning and analyzing method of an oscillation center based on reactive power integral in a multi-machine system. The method comprises the following steps of 1, obtaining dynamic response data of a power grid; 2, extracting the data of a large power grid, so as to obtain the required generator power angle, bus voltage size, bus power and phase angle difference of voltages at the two ends of a connecting line; 3, grouping the system according to the relative power angle of a generator; 4, observing the fluctuation condition of the voltage of a critical branch; 5, carrying out reactive integral on the possible oscillation center; and 6, using the phase angle difference of the bus voltage to detect the obtained branch. The method has the advantages that the cross section of the oscillation center is determined by the reactive power integral of the branch under the assisting of the variation features of electric amount of the oscillation center and the relative power angle difference of the generator, the speed and the precision of the original reactive power integral method are improved, the effect by the running method and the structure change of the power grid is avoided, the method is visual and accurate, the implementation is easy, and the reliability is high.

Description

technical field [0001] The invention relates to an oscillation center positioning analysis method, in particular to an oscillation center positioning analysis method based on reactive power integration in a multi-machine system. Background technique [0002] At present, the common methods for locating the oscillation center are as follows: [0003] (1) based on The oscillation center localization method: [0004] The method is based on The out-of-step decoupling device of the power system uses the voltage and current collected at the installation site to calculate the voltage of the oscillation center, and distinguishes out-of-step oscillation, synchronous oscillation, and short-circuit faults according to the change law of the oscillation center voltage. [0005] There is a clear functional relationship between the oscillation center voltage and the power angle δ, so the oscillation center voltage can be used The change of reflects the change of power angle. The pow...

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Problems solved by technology

[0014] However, this criterion also has shortcomings. When the ratio of the potential amplitudes at both ends exceeds a certain range, the out-of-step center will move out of the line. At this time, the voltage phase angle difference at both ends of the tie line is still fluctuating within a small range. The unloading device will not lose synchronization and cause malfunction

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