Out-of-step oscillation center position positioning method based on minimum measured impedance

Abstract

The invention discloses an out-of-step oscillation center position positioning method based on a minimum measured impedance. The method comprises the following steps: according to the grid structure of a power grid, arranging observation points on two sides of a link connection line of the power grid and a plurality of stages of subordinate lines; calculating a minimum measured impedance of each observation point in an out-of-step oscillation period; determining the line where an out-of-step oscillation center is located according to the minimum measured impedance of each observation point inthe out-of-step oscillation period; positioning the position of the out-of-step oscillation center according to the line where the out-of-step oscillation center is located. The out-of-step oscillation center position positioning method based on a minimum measured impedance can accurately locate the position of the out-of-step oscillation center according to the minimum measured impedance values and directions of different observation points, and the minimum measured impedance is used as judging basis, thereby improving adaptability for changes of operation modes of the power grid. The methodhas anti-interference performance on tide large fluctuation in an out-of-step oscillation process and out-of-order operation of control equipment, and the method has good application prospect.

Description

Technical field [0001] The invention relates to the technical field of out-of-synchronization oscillations of power systems, and in particular to a method for locating the out-of-synchronization oscillation center position based on a minimum measurement impedance. Background technique [0002] The power system may lose synchronization when encountering multiple serious faults, forming two or more asynchronously operating subsystems. There are out-of-step oscillation sections between the subsystems. The voltage phase difference on both sides of the out-of-step oscillation section gradually increases from the initial value. And it exceeds 180 degrees, and then periodically changes from 0 degrees to 360 degrees. At any moment, there is always a point on the out-of-step cross-section connecting line with the lowest voltage amplitude relative to other points. This point is called the out-of-step oscillation center . [0003] Take the out-of-step oscillation of two clusters as an exampl...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the positioning method of the out-of-step oscillation center in the prior art, which is easily disturbed by factors such as abnormal fluctuations in power grid power flow and disorderly actions of control equipment during the oscillation process, which affects the accuracy of the judgment result, and the judgment result is accurate low degree problem

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