Location method of out-of-step oscillation center based on minimum measured impedance

Abstract

The invention discloses a method for locating the out-of-step oscillation center position based on the minimum measured impedance, which comprises the following steps: according to the network frame structure of the power grid, observation points are set on both sides of the connection line of the power grid and several subordinate lines; The minimum measured impedance of the observation point in the out-of-step oscillation cycle; according to the minimum measured impedance of each observation point in the out-of-step oscillation cycle, determine the line where the out-of-step oscillation center is located; according to the line where the out-of-step oscillation center is located, locate the out-of-step Oscillation center position. The out-of-step oscillation center position positioning method based on the minimum measurement impedance of the present invention accurately locates the out-of-step oscillation center position according to the size and direction of the minimum measurement impedance of different observation points, and uses the minimum measurement impedance as a judgment basis, which improves the detection of changes in the operation mode of the power grid The adaptability, and the anti-interference ability to the large fluctuation of the power flow and the disorderly action of the control equipment in the process of out-of-step oscillation, have a good application prospect.

Description

technical field [0001] The invention relates to the technical field of out-of-step oscillation in power systems, in particular to a method for locating the center of out-of-step oscillation based on minimum measured impedance. Background technique [0002] When the power system encounters multiple severe faults, it may lose synchronization and form two or more subsystems that operate asynchronously. There is an out-of-step oscillation section between the subsystems, and the voltage phase difference on both sides of the out-of-step oscillation section gradually increases from the initial value. And exceed 180 degrees, and then periodically change in the range of 0 degrees to 360 degrees. At any time, there is always a point on the contact line of the out-of-step section whose voltage amplitude is the lowest relative to other points. This point is called the out-of-step oscillation center . [0003] Taking the out-of-step oscillation of two machine groups as an example, the f...

AI Technical Summary

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

Images