A Classification Method of Voltage Sag Considering Phase Jump

Abstract

A voltage sag classification method considering phase jumps, comprising the following steps: Step 1: Obtain three-phase voltage amplitudes and phase angles from sag recording data, and obtain three-phase phasors And make a phasor diagram; Step 2: Obtain sag information from the voltage conditions of each phase obtained in step 1, respectively judge whether the sag occurs in the three-phase voltage, and calculate the three-phase phase jump value respectively by the obtained voltage phase angle; step 3: Use the sag information obtained in step 2 to obtain classification results according to the classification method. The method of the present invention is applied to the classification of voltage sags, which can solve the defect of ignoring phase jumps in the previous voltage sag classification methods, and is more in line with the real situation of the power system. It can formulate evaluation standards and suppress All the measures 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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