Assessment method for transient voltage stabilization of load area of electrical power system

Abstract

The invention relates to an assessment method for transient voltage stabilization of a load area of an electrical power system and belongs to the electrical power system stability analyzing and assessment field. The assessment method for the transient voltage stabilization of the load area of the electrical power system includes that using data measured by a synchronous phasor measurement unit as basis, and building an initial sample database for data mining through a lot of simulation samples; extracting characteristics for reflecting the stabilization degree of each node through the quantitative evaluation for each node in the area; identifying through a multiple linear regression method to obtain sensitivity coefficients for reflecting the mutual influence relations between the nodes in a local area network; using a semi-supervised clustering method to demarcate all the samples; using a decision tree algorithm to perform classified learning to obtain a decision tree model, and using the decision tree model for online monitoring to assess the global transient voltage stabilization state of the load area of the electrical power system.

Description

technical field [0001] The invention relates to an evaluation method for transient voltage stability in a load region of a power system, belonging to the field of power system stability analysis and evaluation. Background technique [0002] In recent years, there have been many voltage collapse accidents around the world, which have drawn more and more attention to the voltage stability of power systems. The transient voltage instability or collapse caused by short-term large disturbance is particularly serious. If the regional transient voltage instability can be accurately judged during online monitoring and preventive and control measures are taken in time, it will help to contain the transient voltage instability accident. The large-scale cascading voltage instability or collapse caused by some nodes improves the overall stability of the region. In actual operation, engineering criteria based on fixed voltage thresholds are often used to judge transient voltage instabil...

AI Technical Summary

Problems solved by technology

However, some traditional evaluation methods based on data mining are carried out on the premise that the theoretical basis of the research problem is relatively complete, and few studies involve the evaluation of regional transient voltage stability, and most of them use engineering criteria based on traditional experience to evaluate Calibrating the initial data does not give full play to the advantages of data mining methods in exploring data laws

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