Node voltage sag severity multi-index evaluation method

Abstract

The invention discloses a node voltage sag severity multi-index evaluation method, which selects a plurality of evaluation indexes to establish an evaluation index set, overcomes the defect that onlyone aspect of the power supply side or the power consumption side is considered in the traditional evaluation method, and combines the two together to make the evaluation result more comprehensive. Atthe same time, the comprehensive weighting method based on AHP and CRITIC method is used to give new weight to the indexes, which not only fully considers the deep internal correlation among the evaluation indexes, but also reflects their relative importance, so that the evaluation results are more reasonable. The simulation results show that the method can reflect the actual situation of distribution network more truly, can accurately and effectively identify the weak nodes and vulnerable areas in the network, and lay the foundation for the treatment of voltage sag.

Description

technical field [0001] The invention relates to the field of evaluating the voltage sag level of a power system, in particular to a multi-index evaluation method for node voltage sag severity. Background technique [0002] With the increase of sensitive loads in the power system and the continuous improvement of power quality requirements, the economic losses caused by voltage sags also increase rapidly, which has become the most prominent problem in power quality. Therefore, it is very necessary to evaluate the severity of voltage sag in the distribution network, which can provide a basis for power grid transformation, equipment manufacturing, reasonable selection of load access points and voltage sag control. One of the most common methods for assessing the severity of voltage sags is the Monte Carlo method. [0003] Monte Carlo method, also known as random sampling technique or statistical test method, the basic idea of ​​this method: first establish a probability model ...

AI Technical Summary

Problems solved by technology

[0004] The Monte Carlo method-based voltage sag evaluation mostly focuses on the calculation results of the power supply side indicators such as voltage sag amplitude, duration, sag energy, and frequency. There are also literatures that specifically analyze the sensitivity of sensitive equipment on the power consumption side to voltage sags. However, at present, there are not many studies that combine the two effectively and evaluate the severity of distribution network node voltage sag from the power supply side.

Images