Voltage sag sorting method considering phase jumps

Abstract

The invention provides a voltage sag sorting method considering phase jumps. The method includes the following steps that firstly, three-phase voltage amplitude values and phase angles are acquired through sag recording data, three-phase phasors shown in the specification are acquired, and a phasor graph is drawn; secondly, sag information is acquired through phase voltage conditions acquired in the first step, whether three-phase voltages sag or not is judged, and three-phase jump values are calculated through the acquired voltage phase angles; thirdly, according to the sag information acquired in the second step and the sorting method, a sorting result is acquired. When the method is applied to voltage sag sorting, the defect that phase jumps are neglected in an original voltage sag sorting method can be overcome, the real condition of a power system is satisfied, and evaluative criteria and restraint measures which are formulated for power equipment sensitive to the phase jumps have certain reference value.

Description

technical field [0001] The invention belongs to the technical field of power quality analysis, in particular to a voltage sag classification method considering phase jumps. Background technique [0002] Voltage sag refers to a power quality event in which the root mean square value of the voltage drops suddenly in a short period of time due to short-circuit faults in the power system, large-scale motor startup, and transformer excitation inrush current. [0003] To analyze and evaluate the impact of voltage sag on sensitive equipment, and to take measures with better economic performance to alleviate the impact of voltage sag has become the focus of research by relevant departments at home and abroad. Before this, it is necessary to correctly understand the characteristics of voltage sag , to learn about voltage sag categories. In previous studies, researchers paid more attention to the analysis of sag amplitude and sag duration. Considering that the sag is often accompani...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a voltage sag classification method considering phase jumps, combined with short-circuit fault types, taking phase jumps into consideration on the basis of previous classifications, and proposing a more general voltage sag classification method, aiming at It is applied to the classification of voltage sags to solve the defect of ignoring phase jumps in the previous classification methods of voltage sags. The specific steps are as follows:

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