A power system transient stability assessment method based on power flow characteristics before and after a fault

Abstract

The invention relates to the technical field of power system transient stability assessment, in particular to a power system transient stability assessment method based on power flow characteristics before and after a fault. The specific steps are as follows: S1, data acquisition: obtaining power required for training and testing a classifier System operation data, use PSAT software to build a New England ten-machine thirty-nine node power system model, the simulation platform is based on MATLAB R2016, the present invention adopts the support vector machine (SVM) classifier by design under the concept of safety domain and stability domain. The purpose of making a judgment on the transient stability of the power system is to reduce the number of missed judgment samples under the concept of stability domain. When only one result of the judgment results is that the system is unstable after being disturbed, then the result of the comprehensive analysis is that the system is unstable, which can be Reducing the number of missed judgment samples has certain reference significance for ensuring the safe and stable operation of the power system.

Description

technical field [0001] The invention relates to the technical field of power system transient stability evaluation, in particular to a power system transient stability evaluation method based on power flow characteristics before and after a fault. Background technique [0002] With the development of society and economy, the demand for electricity continues to grow, the grid-connected operation of new energy sources and the increase in load diversity have made the operation mechanism of the power grid increasingly complex, posing new challenges to the safe and stable operation of the power grid. Definition of Transient Stability of Power Systems It is an important part of the dynamic security and stability of the power grid for the ability of the generators to maintain synchronous operation after the power system suffers from large disturbances (such as short-circuit faults). influences. [0003] Power system transient stability assessment is of great significance to the sa...

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Problems solved by technology

[0003] The transient stability evaluation of power system is of great significance to the safe and stable operation of the power grid. The accuracy and rapidity of the evaluation method have become the goals pursued by power researchers. At present, the transient stability evaluation methods are mainly divided into three categories: time domain simulation method, Direct method and machine learning method, time domain simulation method is an accurate method to solve the transient stability problem, but it needs to solve a series of differential algebraic equations representing the physical components of the power system, the calculation is time-consuming, and it is difficult to meet the requirements of rapid evaluation , the direct method evaluates the stability of the system from the point of view of energy, the energy function is simple, intuitive, and the physical meaning is clear, but there are problems such as difficulty in constructing the energy function

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